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Intra-species variability in migratory movement of hawksbill turtles in the southwest Indian Ocean Endanger. Species Res. (IF 3.1) Pub Date : 2024-03-14 Manon Nivière, Mayeul Dalleau, Jérôme Bourjea, Claire Jean, Stéphane Ciccione, Jeanne A. Mortimer, Vanessa Didon, David Rowat, Gérard Rocamora, Ravaka Ranaivoson, Jamal Mahafina, Lalatiana Odile Randriamiharisoa, Eliott Barichasse, Olivier Bousquet, Anne Barat, Antoine Laforge, Katia Ballorain
ABSTRACT: Implementing effective conservation measures to manage migratory populations is challenging, especially in a relatively inaccessible dynamic environment such as the ocean. With limited financial and human resources, efforts must be intelligently prioritized to achieve conservation success and reduce uncertainties of conservation efforts. The southwest Indian Ocean (SWIO) hosts some of the
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Current status, biology, threats and conservation priorities of the vulnerable Mediterranean monk seal Endanger. Species Res. (IF 3.1) Pub Date : 2024-03-14 Alexandros A. Karamanlidis
ABSTRACT: The Mediterranean monk seal Monachus monachus is one of the most endangered marine mammals on Earth. The species has made a notable recovery during the past 10 yr and is now considered Vulnerable by the International Union for the Conservation of Nature. Its global population comprises 3 subpopulations: 2 in the northeastern Atlantic Ocean and one in the eastern Mediterranean Sea. Global
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Genomic analysis of population history for Hawaiian monk seals Endanger. Species Res. (IF 3.1) Pub Date : 2024-03-14 Samantha Hauser, Stacie Robinson, Emily Latch
ABSTRACT: The Hawaiian monk seal Neomonachus schauinslandi, one of the world’s most endangered pinnipeds, has faced decades of declines and has been the focus of intensive conservation efforts. A myriad of conservation threats has led to range-wide population declines, but population trends among islands can vary widely in response to heterogeneous threats. Populations in the Northwestern Hawaiian
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Vulnerability of the Critically Endangered leatherback turtle to fisheries bycatch in the eastern Pacific Ocean. II. Assessment of mitigation measures Endanger. Species Res. (IF 3.1) Pub Date : 2024-03-14 Shane P. Griffiths, Bryan P. Wallace, Verónica Cáceres, Luz Helena Rodríguez, Jon Lopez, Marino Abrego, Joanna Alfaro-Shigueto, Sandra Andraka, María José Brito, Leslie Camila Bustos, Ilia Cari, José Miguel Carvajal, Ljubitza Clavijo, Luis Cocas, Nelly de Paz, Marco Herrera, Ann Marie Lauritsen, Jeffrey C. Mangel, Miguel Pérez-Huaripata, Rotney Piedra, Javier Antonio Quiñones Dávila, Liliana Rendón
ABSTRACT: Industrial tuna and artisanal fisheries targeting multiple species in the eastern Pacific Ocean (EPO) interact with the Critically Endangered East Pacific (EP) leatherback turtle Dermochelys coriacea. In 2021, a revised Inter-American Tropical Tuna Commission (IATTC) resolution on sea turtles aimed to reduce sea turtle bycatch in EPO industrial tuna fisheries and ensure their safe handling
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Vulnerability of the Critically Endangered leatherback turtle to fisheries bycatch in the eastern Pacific Ocean. I. A machine-learning species distribution model Endanger. Species Res. (IF 3.1) Pub Date : 2024-03-14 Jon Lopez, Shane Griffiths, Bryan P. Wallace, Verónica Cáceres, Luz Helena Rodríguez, Marino Abrego, Joanna Alfaro-Shigueto, Sandra Andraka, María José Brito, Leslie Camila Bustos, Ilia Cari, José Miguel Carvajal, Ljubitza Clavijo, Luis Cocas, Nelly de Paz, Marco Herrera, Jeffrey C. Mangel, Miguel Pérez-Huaripata, Rotney Piedra, Javier Antonio Quiñones Dávila, Liliana Rendón, Juan M. Rguez-Baron, Heriberto
ABSTRACT: The Eastern Pacific population of leatherback turtles Dermochelys coriacea is Critically Endangered, with incidental capture in coastal and pelagic fisheries as one of the major causes. Given the population’s broad geographic range, status, and extensive overlap with fisheries throughout the region, identifying areas of high importance is essential for effective conservation and management
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Using ‘pup multipliers’ to estimate demographic parameters of Mediterranean monk seals in the eastern Mediterranean Sea Endanger. Species Res. (IF 3.1) Pub Date : 2024-03-14 Alexandros A. Karamanlidis
ABSTRACT: A thorough understanding of population demographics is important in planning and evaluating conservation actions. At the same time, it is also essential that conservation management strives to minimize uncertainty in decision making in order to avoid management errors, which in the case of endangered species might affect their persistence. Mediterranean monk seals are endangered and have
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Factors regulating incubation temperature and thermal stress in hawksbills in St. Croix, USVI Endanger. Species Res. (IF 3.1) Pub Date : 2024-02-29 Erin Lyons, Evan DAlessandro, Manoj Shivlani, Clayton Pollock, Kristen Ewen
ABSTRACT: The hawksbill sea turtle is listed as Critically Endangered under the IUCN Red List and has been slow to recover in the Caribbean due to historical exploitation and ongoing anthropogenic threats. In turtles, sex and reproductive success are determined by incubation temperatures, whereby lower temperatures produce male hatchlings and higher temperatures produce female hatchlings. As incubation
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Incomplete isolation in the nonbreeding areas of two genetically separated but sympatric short-tailed albatross populations Endanger. Species Res. (IF 3.1) Pub Date : 2024-02-29 Naoki Tomita, Fumio Sato, Jean-Baptiste Thiebot, Bungo Nishizawa, Masaki Eda, Hiroe Izumi, Satoshi Konno, Miwa Konno, Yutaka Watanuki
ABSTRACT: The short-tailed albatross Phoebastria albatrus, a globally Vulnerable species recovering from near-extinction, breeds mainly on 2 island groups in the north-western Pacific: Torishima and Senkaku Islands. Recently, it became clear that this is a species complex, composed of 2 populations (‘Torishima’ and ‘Senkaku’ types) that are distinct from both genetic and morphological perspectives
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Length at life stages of the white shark Carcharodon carcharias in the western North Atlantic Endanger. Species Res. (IF 3.1) Pub Date : 2024-02-29 J. Fernando Márquez-Farías, John P. Tyminski, George C. Fischer, Robert E. Hueter
ABSTRACT: Length at life stages of the white shark Carcharodon carcharias is not well known for most of the 9 populations of this species, including in the western North Atlantic (WNA). We analyzed length and maturity data by sex for 87 white sharks with sizes ranging 138-501 cm total length (TL), captured, studied, and released by OCEARCH during 2012-2022, off the US and Canadian Atlantic coasts.
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Haematologic and plasma biochemical reference intervals for flatback turtles Natator depressus Endanger. Species Res. (IF 3.1) Pub Date : 2024-02-15 Erina J. Young, Kristin S. Warren, Scott D. Whiting, Nahiid S. Stephens, Mieghan Bruce, Rebecca Donaldson, Bethany Jackson, Lian Yeap, Rebecca Vaughan-Higgins
ABSTRACT: Blood reference intervals (RIs) provide an indication of systemic health and are central to any baseline health survey. RIs are available for all sea turtle species, except for the flatback turtle Natator depressus. We developed the first nesting and foraging flatback turtle RIs from a healthy reference population of 211 individuals. We found flatback turtle RIs were generally similar to
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Intraspecific variability in flatback turtle habitat use: δ15N as an indicator of foraging locations Endanger. Species Res. (IF 3.1) Pub Date : 2024-02-15 K. Abrantes, N. Wildermann, I. B. Miller, M. Hamann, C. J. Limpus, C. A. Madden Hof, I. Bell, M. Sheaves, A. Barnett
ABSTRACT: Identifying migration routes and key habitats is critical for the management and conservation of migratory species. Tracking and stable isotope analysis (SIA), particularly of carbon (δ13C) and nitrogen (δ15N), are often used to study animal movements, with SIA particularly useful when animals move through isotopic gradients. Marine turtles are typically highly migratory, moving between nesting
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Multi-index evaluation of fish habitat in a cascaded hydropower reservoir of the Yangtze River, China Endanger. Species Res. (IF 3.1) Pub Date : 2024-02-15 Wei Zheng, Siyang Wang, Zehao Lv, Peng Zhang, Zhi Yang, Jianbo Chang
ABSTRACT: Cascaded hydropower development in rivers has a greater negative impact on native fish than a single hydropower station. The effectiveness of commonly used measures to restore fish resources, such as ecological discharges, depends largely on reliable assessments of habitat quality. In this study, we developed a synthesized habitat quality index (SHQI) by combining the habitat suitability
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Videographic monitoring at caves to estimate population size of the endangered yǻyaguak (Mariana swiftlet) on Guam Endanger. Species Res. (IF 3.1) Pub Date : 2024-02-15 P. Marcos Gorresen, Paul Cryan, Megan Parker, Frank Alig, Melia Nafus, Eben H. Paxton
ABSTRACT: The yǻyaguak (Mariana swiftlet; Aerodramus bartschi) is an endangered cave-nesting species historically found on Guam and the southern Mariana Islands, Micronesia. The population on Guam has been severely affected by the introduction of the brown treesnake Boiga irregularis. Population status assessments have, however, been challenging due to the limitations of traditional counting methods
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Population genetics of gharial Gavialis gangeticus in the Chambal River, India, using novel polymorphic microsatellite markers Endanger. Species Res. (IF 3.1) Pub Date : 2024-02-15 Ravi Kumar Singh, Jailabdeen AjjiM, Jeffrey W. Lang, Harika Segu, Harisharan Ramesh, Karthikeyan Vasudevan
ABSTRACT: The gharial Gavialis gangeticus is a Critically Endangered crocodylian endemic to the Indian subcontinent. The species has experienced a 95% population decline over the past 2 centuries. The largest self-sustaining population inhabits the protected National Chambal Sanctuary (NCS) in north India and represents >80% of extant gharials globally. We developed de novo a panel of polymorphic gharial-specific
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A rapid assessment of the status of sawfishes in the Philippines Endanger. Species Res. (IF 3.1) Pub Date : 2024-02-01 Ruth H. Leeney, Alexanra Bagarinao-Regalado, Diana Verdote, Carla Drury Salgado
ABSTRACT: Globally, sawfishes are amongst the most threatened of all sharks and rays, but a paucity of current data on their presence and status has limited conservation action in many countries. Whilst 2 sawfish species, Pristis pristis and P. zijsron, were historically present in the Philippines, a lack of recent reports suggests that they may have become extremely rare. To determine the current
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Notable abundance of two Critically Endangered elasmobranch fishes near an area of intensive coastal development in the Arabian Gulf Endanger. Species Res. (IF 3.1) Pub Date : 2024-02-01 Shamsa Al Hameli, Stephan Bruns, Aaron C. Henderson
ABSTRACT: The Pakistan whipray Maculabatis arabica and the halavi guitarfish Glaucostegus halavi are Critically Endangered elasmobranch species that are endemic to areas of the northern Indian Ocean. An unexpectedly high abundance of both species in a shallow, nearshore area of Abu Dhabi, United Arab Emirates, is described here. Both species were found to utilise this area year-round, although seasonal
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Review of three southwestern Indian Ocean species of Rhinobatos (Rhinopristiformes: Rhinobatidae) Endanger. Species Res. (IF 3.1) Pub Date : 2024-02-01 Rachel M. Aitchison, David A. Ebert, Bernard Séret, Simon Weigmann
ABSTRACT: The shark-like rays (Rhinopristiformes) are among the most threatened species of cartilaginous fishes. The guitarfishes (Rhinobatidae) are one of 5 families in the order, with 62% of species assessed as Vulnerable or higher by the International Union for the Conservation of Nature (IUCN). Species-specific fisheries and conservation efforts have been limited, however, due to unresolved taxonomic
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Trends in catch rates of sawfish on the Australian North West Shelf Endanger. Species Res. (IF 3.1) Pub Date : 2024-02-01 Alastair V. Harry, Corey B. Wakefield, Stephen J. Newman, J. Matias Braccini
ABSTRACT: Northwestern Australia is thought to have some of the world’s last remaining viable sawfish populations, although little quantitative data exists on their status or trends. This study examined 17 years of logbook bycatch records (n = 815) for green sawfish Pristis zijsron and narrow sawfish Anoxypristis cuspidata from a trawl fishery operating on the Australian North West Shelf. Incidental
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Social acceptability of conservation interventions for flatback turtles: comparing expert and public perceptions Endanger. Species Res. (IF 3.1) Pub Date : 2024-01-18 Paris Tuohy, Shane A. Richards, Christopher Cvitanovic, Ingrid van Putten, Alistair J. Hobday, Linda Thomas, Ruby Annand-Jones
ABSTRACT: Sea turtles are facing significant threats, including anthropogenic warming, predation from feral animals, and sea level rise. While a range of intervention options are available, resource constraints and increasing time pressures means managers face the difficult task of prioritising options. To achieve successful conservation outcomes, managers are increasingly seeking to understand the
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Examining the effect of environmental variability on the viability of endangered Steller sea lions using an integrated population model Endanger. Species Res. (IF 3.1) Pub Date : 2023-12-14 Amanda J. Warlick, Devin S. Johnson, Katie L. Sweeney, Tom S. Gelatt, Sarah J. Converse
ABSTRACT: Understanding spatio-temporal variability in demography and the influence of environmental conditions offers insight into the factors underlying population dynamics. This is particularly true for species with divergent demographic patterns across large geographic areas. The contrasting abundance trends observed across the range of Steller sea lions Eumetopias jubatus have been studied extensively
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Key issues in assessing threats to sea turtles: knowledge gaps and future directions Endanger. Species Res. (IF 3.1) Pub Date : 2023-12-14 Mariana M. P. B. Fuentes, Erin McMichael, Connie Y. Kot, Ian Silver-Gorges, Bryan P. Wallace, Brendan J. Godley, Annabelle M. L. Brooks, Simona A. Ceriani, Adriana A. Cortés-Gómez, Tiffany M. Dawson, Kara. L. Dodge, Mark Flint, Michael P. Jensen, Lisa M. Komoroske, Sara Kophamel, Matthew D. Lettrich, Christopher A. Long, Sarah E. Nelms, Ana R. Patrício, Nathan J. Robinson, Jeffrey A. Seminoff, Matthew
ABSTRACT: Sea turtles are an iconic group of marine megafauna that have been exposed to multiple anthropogenic threats across their different life stages, especially in the past decades. This has resulted in population declines, and consequently many sea turtle populations are now classified as threatened or endangered globally. Although some populations of sea turtles worldwide are showing early signs
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Rediscovery of the giant featherback Chitala lopis (Notopteridae) in its type locality resolves decades of taxonomic confusion Endanger. Species Res. (IF 3.1) Pub Date : 2023-11-30 Arif Wibowo, Haryono Haryono, Kurniawan Kurniawan, Vitas Atmadi Prakoso, Hadi Dahruddin, Indah Lestari Surbani, Yohanes Yudha P. Jaya, Sudarsono Sudarsono, Fathur Rochman, Boby Muslimin, Tedjo Sukmono, Meaghan L. Rourke, Harald Ahnelt, Simon Funge-Smith, Nicolas Hubert
ABSTRACT: Unresolved taxonomy poses a significant challenge for conservation and recovery efforts of freshwater fishes in Indonesia. Asian featherbacks of the genus Chitala are found in Java, Sumatra and Borneo, and currently thought to comprise 3 of 6 species: C. lopis, C. hypselonotus, and C. borneensis. According to the IUCN, Chitala species are of Least Concern in Indonesia, except for C. lopis
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Hawksbill and green turtle niche overlap in a marine protected area, US Virgin Islands Endanger. Species Res. (IF 3.1) Pub Date : 2023-11-30 Melissa A. Moorehouse, John D. Baldwin, Kristen M. Hart
ABSTRACT: Studying how species interact with their environment and other co-occurring species are 2 main aspects of ecology. For marine turtles, ocean currents drive migratory routes and may determine the location of surrounding foraging grounds. As a result, circumglobal species like the hawksbill turtle Eretmochelys imbricata and green turtle Chelonia mydas adapt to diverse foraging habitats and
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Status of the largetooth sawfish in Ecuador and Peru, and use of rostral teeth in cockfighting Endanger. Species Res. (IF 3.1) Pub Date : 2023-11-30 Mariano Cabanillas-Torpoco, Kerstin Forsberg, Rigoberto Rosas-Luis, María G. Bustamante Rosell, Claudia Ampuero-Portocarrero, Ángela Hernando, Gonzalo Panizo, Ruth H. Leeney
ABSTRACT: Sawfish conservation is a critical concern, yet insufficient baseline data on their presence and status has hindered conservation efforts at national and regional levels. Between 2015 and 2017, interviews were conducted in fishing communities in Ecuador and Peru to assess the historical and current status of largetooth sawfish Pristis pristis. Interviews with cockfighting practitioners in
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Predicted distribution of ‘ua‘u (Hawaiian petrel Pterodroma sandwichensis) nest sites on Haleakalā, Maui Endanger. Species Res. (IF 3.1) Pub Date : 2023-11-30 Josh Adams, Jonathan J. Felis, Rob Klinger, Emma C. Kelsey, Joy Tamayose, Raina Kaholoaa, Cathleen Bailey, Jay F. Penniman, Jennifer Learned, Ciara Ganter, John Medeiros, Huisheng Chen
ABSTRACT: Haleakalā National Park and montane areas on east Maui, Hawaiian Archipelago, support critical nesting habitat for endangered ‘ua‘u Hawaiian petrel Pterodroma sandwichensis. Habitat loss, non-native predators, and damage by feral ungulates are limiting factors for ground-nesting petrels at Haleakalā and throughout Hawai‘i. Because nesting habitats differ among the Hawaiian Islands, habitat
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Marine turtle regional management units 2.0: an updated framework for conservation and research of wide-ranging megafauna species Endanger. Species Res. (IF 3.1) Pub Date : 2023-11-16 Bryan P. Wallace, Zachary A. Posnik, Brendan J. Hurley, Andrew D. DiMatteo, Ashleigh Bandimere, Isabel Rodriguez, Sara M. Maxwell, Lucy Meyer, Hannah Brenner, Michael P. Jensen, Erin LaCasella, Brian M. Shamblin, F. Alberto Abreu-Grobois, Kelly R. Stewart, Peter H. Dutton, Hector Barrios-Garrido, Mayuel Dalleau, Florence Dellamico, Karen L. Eckert, Nancy N. FitzSimmons, Marco Garcia-Cruz, Graeme C
ABSTRACT: Delineating spatial boundaries that accurately encompass complex, often cryptic, life histories of highly migratory marine megafauna can be a significant conservation challenge. For example, marine turtles range across vast ocean basins and coastal areas, thus complicating the evaluation of relative impacts of multiple overlapping threats and the creation of coherent conservation strategies
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A focus on flatback turtles: the social acceptability of conservation interventions in two Australian case studies Endanger. Species Res. (IF 3.1) Pub Date : 2023-10-26 Ingrid E. van Putten, Christopher Cvitanovic, Paris Tuohy, Ruby Annand-Jones, Michael Dunlop, Alistair J. Hobday, Linda Thomas, Shane A. Richards
ABSTRACT: Human-induced climate change is a threat to marine species and ecosystems worldwide, including sea turtles. As climate changes are projected to intensify, directed management and intervention is required to safeguard the future of vulnerable species and ecosystems. Prioritisation tools that explore the cost-benefit-risk can help in the choice of interventions. However, an often-overlooked
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Whisker stable isotope analysis used for proactive management of recolonising New Zealand sea lion population Endanger. Species Res. (IF 3.1) Pub Date : 2023-10-26 B. L. Chilvers
ABSTRACT: New Zealand sea lions Phocarctos hookeri have experienced a 46% decline in pup production in the last 25 yr, driven by female deaths in trawl fisheries around the Auckland Islands. The only colony for this species recorded away from the subantarctics and this fishing impact is on Stewart Island. Despite the Stewart Island colony only being 1% of the species, it is significant, as it is currently
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Summer and winter surveys of deep waters of the Hellenic Trench, Greece, provide insights into the spatial and temporal distribution of odontocetes Endanger. Species Res. (IF 3.1) Pub Date : 2023-10-26 Kirsten F. Thompson, Thomas Webber, Leonidas Karantzas, Jonathan Gordon, Alexandros Frantzis
ABSTRACT: The Mediterranean Sea provides habitat for globally threatened cetaceans. The Hellenic Trench is an Important Marine Mammal Area, providing core habitat for sperm whales Physeter macrocephalus and Cuvier’s beaked whales Ziphius cavirostris. Surveys have characterized distributions of these species in near-shore areas (<2000 m deep). Sparse survey effort in deeper waters during winter has
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Characteristics of east Australian demersal trawl elasmobranch bycatch as revealed by short-term latitudinal monitoring Endanger. Species Res. (IF 3.1) Pub Date : 2023-10-12 Thomas C. Barnes, Daniel D. Johnson
ABSTRACT: Elasmobranchs are being depleted on a global scale, caused mainly by fisheries. Demersal trawling is a component of mortality but is often not assessed. This could pose risk to benthic/demersal elasmobranchs which are often endemic and therefore vulnerable to fisheries when species ranges are within (or mainly within) trawl footprints. Northern New South Wales (NSW) is an area with endemism
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Predicting core areas of flatback turtle hatchlings and potential exposure to threats Endanger. Species Res. (IF 3.1) Pub Date : 2023-10-12 Phillipa Wilson, Charitha Pattiaratchi, Scott Whiting, Luciana C. Ferreira, Sabrina Fossette, Kellie Pendoley, Michele Thums
ABSTRACT: The lack of data on distribution of juvenile marine species can limit conservation efforts. As hatchlings, marine turtles are too small to track using satellite telemetry, so their at-sea distribution remains unknown. This knowledge gap is critical, as hatchlings already experience high mortality in coastal zones. In addition, further risks to their survival may occur beyond these areas,
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Characteristics of ocelot populations in Tamaulipas, Mexico, using capture-recapture techniques Endanger. Species Res. (IF 3.1) Pub Date : 2023-10-12 Mitch A. Sternberg, Greta M. Schmidt, Rogelio Carrera-Treviño, Omar A. Ocañas-García, Francisco Illescas-Martínez, Thomas deMaar, Luis Jaime Peña
ABSTRACT: Although the ocelot Leopardus pardalis is listed as endangered in the USA and Mexico, research on the characteristics of ocelot populations in northeastern Mexico has been limited. Effective conservation strategies in this binational region can benefit from additional information on the distribution and status of these populations. We estimated ocelot abundance and density using capture-recapture
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Preliminary insight into the reproductive traits of the flapper skate Dipturus intermedius using in-field ultrasonography and circulating hormone concentrations Endanger. Species Res. (IF 3.1) Pub Date : 2023-09-28 James Thorburn, Georgina Cole, Adam Naylor, Amy Garbett, Kirsten Wilson, Mark James, Jane Dodd, Jonathan D. R. Houghton, Patrick C. Collins
ABSTRACT: Due to global population declines, there is a pressing need for data on the life history traits of many elasmobranch species to support the development of species-specific management plans. A lack of information on the reproductive cycle of the Critically Endangered flapper skate Dipturus intermedius was recently identified as a hindrance to its conservation. To address this data gap, we
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Predicting the occurrence of an endangered salamander in a highly urbanized landscape Endanger. Species Res. (IF 3.1) Pub Date : 2023-09-28 Andie L. Siemens, Jim P. Bogart, Jessica E. Linton, D. Ryan Norris
ABSTRACT: Effective protection of threatened species living in highly urbanized landscapes requires detailed information on their population distribution. For species that are difficult to detect, species distribution models (SDMs) can be valuable tools for predicting their occurrence. We created an SDM to predict breeding pond locations of the endangered Jefferson salamander Ambystoma jeffersonianum
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A trans-Pacific movement reveals regular migrations of humpback whales Megaptera novaeangliae between Russia and Mexico Endanger. Species Res. (IF 3.1) Pub Date : 2023-09-28 Nicola Ransome, Astrid Frisch-Jordán, Olga V. Titova, Olga A. Filatova, Marie C. Hill, Ted Cheeseman, Amanda L. Bradford, Jorge Urbán R, Pamela Martínez-Loustalot, John Calambokidis, Luis Medrano-González, Alexander M. Burdin, Ivan D. Fedutin, Neil R. Loneragan, Joshua N. Smith
ABSTRACT: Humpback whales Megaptera novaeangliae undertake extensive annual migrations, have complex migratory patterns, and have held several mammalian long-distance movement records. Here, we report on a whale known to feed in the Russian Far East that was sighted in breeding areas on either side of the North Pacific, the Mariana Islands and Mexico, in less than 1 yr (357 d apart). This is the longest
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Habitat use and movement patterns of adult male and juvenile scalloped hammerhead sharks Sphyrna lewini throughout the Hawaiian archipelago Endanger. Species Res. (IF 3.1) Pub Date : 2023-09-28 Melanie Hutchinson, Molly Scott, Robert Bauer, James Anderson, Daniel M. Coffey, Kim Holland, Carl Meyer, John OSullivan, Mark Royer
ABSTRACT: Scalloped hammerhead sharks Sphyrna lewini are a circumglobal species found in tropical and subtropical waters. Globally, populations of S. lewini have undergone dramatic declines in recent decades, and 4 of 6 distinct population segments are at risk of extinction and listed under the United States Endangered Species Act. Despite this, limited data exist on movement behavior or habitat use
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Molecular data validate historical and contemporary distributions of Pleurobema riddellii (Bivalvia: Unionidae) and help guide conservation and recovery efforts Endanger. Species Res. (IF 3.1) Pub Date : 2023-09-14 Nathan A. Johnson, Caitlin E. Beaver, Alexander H. Kiser, Matthew A. Duplessis, Matthew D. Wagner, Robert J. Ellwanger, Clinton R. Robertson, Sean D. Kinney, Beau B. Gregory, Steve Wolverton, Charles R. Randklev, Paul D. Hartfield, James D. Williams, Chase H. Smith
ABSTRACT: Accurate taxonomic and distributional information are arguably the most critical components of conservation status assessments but can be greatly affected by misidentifications. The Louisiana pigtoe Pleurobema riddellii is a freshwater mussel proposed as threatened under the US Endangered Species Act. The species belongs to the tribe Pleurobemini, which includes multiple taxa that are inherently
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Impacts of nest temperatures on leatherback reproductive success, hatchling morphology, and performance in South Florida Endanger. Species Res. (IF 3.1) Pub Date : 2023-08-31 Heather A. Seaman, Sarah L. Milton
ABSTRACT: Leatherback turtles Dermochelys coriacea are experiencing population declines due to various anthropogenic threats. Beaches play a crucial role in the survival of sea turtle species since reproductive success is affected by environmental conditions inside the nest. Climate change is predicted to increase sand temperatures and affect rainfall, which will change the nest microenvironment, and
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Monitoring the diurnal and seasonal foraging of Hawaiian monk seals in mesophotic rubble habitat using seafloor event loggers called ‘electric rocks’ Endanger. Species Res. (IF 3.1) Pub Date : 2023-08-31 Frank A. Parrish, Raymond C. Boland, Michael Sawyer, Brian D. Greene, Birgit Buhleier, Greg J. Marshall
ABSTRACT: Video from cameras fitted to Hawaiian monk seals showed that seals visited patches of loose mesophotic seafloor rock to flip them and obtain the prey hiding underneath. Diver surveys of rock patches documented 38 species of fish and invertebrates and found 38% of the larger diameter rocks (10-100 cm) flipped with the encrusted live coral and algae side left face down. We developed a set of
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Recombinant luteinizing hormone as a tool towards understanding reproductive dysfunction in captive Macquarie perch Macquaria australasica Endanger. Species Res. (IF 3.1) Pub Date : 2023-08-17 Josephine Nocillado, Dean Gilligan, Stewart Fielder, Lachlan P. Dennis, Tianfang Wang, Tomer Ventura, Abigail Elizur
ABSTRACT: The Macquarie perch Macquaria australasica is an endangered freshwater fish endemic to the Murray-Darling Basin in Australia. Captive breeding is considered an essential measure to save the species from extinction, yet its reproductive biology is not fully understood. We produced a recombinant single-chain Macquarie perch luteinizing hormone (rmpLh) in the methylotrophic yeast Pichia pastoris
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First demographic parameter estimates for the Mediterranean monk seal population at Madeira, Portugal Endanger. Species Res. (IF 3.1) Pub Date : 2023-08-17 Rosa Pires, Fernando Aparicio, Jason D. Baker, Sérgio Pereira, Nélio Caires, Miguel A. Cedenilla, Albert L. Harting, Dilia Menezes, Pablo Fernández de Larrinoa
ABSTRACT: We provide the first comprehensive demographic assessment of the Endangered Mediterranean monk seal Monachus monachus population residing in the Madeira Archipelago to identify factors that may impede population growth. Encounter data was obtained for this small, elusive population from 2012 to 2021 using a variety of non-invasive methods. From birth to age 2 mo, when pups molt, survival
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Identifying social clusters of endangered main Hawaiian Islands false killer whales Endanger. Species Res. (IF 3.1) Pub Date : 2023-08-03 Sabre D. Mahaffy, Robin W. Baird, Annette E. Harnish, Tori Cullins, Stephanie H. Stack, Jens J. Currie, Amanda L. Bradford, Dan R. Salden, Karen K. Martien
ABSTRACT: The presence of distinct social groups within an animal population can result in heterogeneity in many aspects of its life history and ecology. The ability to accurately assess social group membership increases with the number of times individuals are identified, but obtaining sufficient sightings of rarely encountered species can be difficult. Three social clusters were previously identified
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Spatiotemporal distribution and sexual segregation in the Critically Endangered angelshark Squatina squatina in Spain’s largest marine reserve Endanger. Species Res. (IF 3.1) Pub Date : 2023-07-20 Lucy R. Mead, David Jiménez Alvarado, Eva Meyers, Joanna Barker, Michael Sealey, Maria Belén Caro, Hector Toledo, Charlotte Pike, Matthew Gollock, Adam Piper, Gail Schofield, Edy Herraiz, David M. P. Jacoby
ABSTRACT: Establishing how threatened wildlife are distributed spatially and temporally is essential for effective conservation and management planning. While many shark species are threatened globally, knowledge on sex-specific differences in behaviour and fine-scale habitat use remains limited, hindering the implementation of appropriate conservation actions. Here, acoustic telemetry was used to
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Regionally endothermic traits in planktivorous basking sharks Cetorhinus maximus Endanger. Species Res. (IF 3.1) Pub Date : 2023-07-20 Haley R. Dolton, Andrew L. Jackson, Robert Deaville, Jackie Hall, Graham Hall, Gavin McManus, Matthew W. Perkins, Rebecca A. Rolfe, Edward P. Snelling, Jonathan D. R. Houghton, David W. Sims, Nicholas L. Payne
ABSTRACT: Few fast-swimming apex fishes are classified as ‘regional endotherms’, having evolved a relatively uncommon suite of traits (e.g. elevated body temperatures, centralised red muscle, and thick-walled hearts) thought to facilitate a fast, predatory lifestyle. Unlike those apex predators, Endangered basking sharks Cetorhinus maximus are massive filter-feeding planktivores assumed to have the
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Summer movements of marbled murrelets from Canada to Alaska Endanger. Species Res. (IF 3.1) Pub Date : 2023-07-06 D. F. Bertram, C. A. MacDonald, P. D. OHara, J. L. Cragg, R. Corcoran, R. Greene, P. Vincent, K. J. Woo
ABSTRACT: Knowledge of seasonal marine bird migration patterns is required to inform marine bird conservation and management efforts. We deployed solar-powered satellite transmitters to track the movements of threatened marbled murrelet Brachyramphus marmoratus during the breeding and post breeding periods. We tagged birds (n = 27) in British Columbia (BC), Canada, over 3 years (2014-2016) from 3 different
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Refining capture-recapture recruitment estimation methods for Atlantic sturgeon Endanger. Species Res. (IF 3.1) Pub Date : 2023-07-06 M. A. Baker, E. C. Ingram, D. L. Higginbotham, B. J. Irwin, A. G. Fox
ABSTRACT: The Atlantic sturgeon Acipenser oxyrinchus oxyrinchus was once of great commercial importance in many coastal rivers of the eastern USA. Over the 19th and 20th centuries, most historical stocks of Atlantic sturgeon were depleted by human activities. Estimating recruitment for the remaining populations is challenging due to sampling constraints, limited age data, and natural variability. However
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Spatial segregation between phenotypes of the diablotin black-capped petrel Pterodroma hasitata during the non-breeding period Endanger. Species Res. (IF 3.1) Pub Date : 2023-07-06 Yvan G. Satgé, Bradford S. Keitt, Chris P. Gaskin, J. Brian Patteson, Patrick G. R. Jodice
ABSTRACT: Despite growing support for ecosystem-based approaches, conservation is mostly implemented at the species level. However, genetic differentiation exists within this taxonomic level, putting genetically distinct populations at risk of local extinction. In the diablotin black-capped petrel Pterodroma hasitata, an endangered gadfly petrel endemic to the Caribbean, 2 phenotypes have been described:
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Green and hawksbill turtle detection and abundance at foraging grounds in Bonaire, Caribbean Netherlands Endanger. Species Res. (IF 3.1) Pub Date : 2023-07-06 Frank F. Rivera-Milán, Kaj Schut, Daan Zeegers, Mabel Nava, Fernando Simal
ABSTRACT: Abundance estimates corrected for changes in detection are needed to assess population trends. We used transect-count surveys and N-mixture models to estimate green turtle Chelonia mydas and hawksbill turtle Eretmochelys imbricata detection and total abundance at foraging grounds in Bonaire during 2003-2018, and we used these total abundance estimates to fit a Bayesian state-space logistic
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Evaluating the appropriateness of risk-based approaches to assess the sustainability of fishery impacts on seabirds Endanger. Species Res. (IF 3.1) Pub Date : 2023-07-06 S. D. Good, M. Gummery, S. McLennan, K. Dewar, S. C. Votier, R. A. Phillips
ABSTRACT: Many seabird populations are declining, with fisheries bycatch as one of the greatest threats. Explicit risk criteria should be used to identify whether bycatch is a problem for particular species and fisheries, but these are often poorly defined. A variety of methods are used to determine the risk that a specific fishery is having an unsustainable impact on a seabird population. Up until
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Influences of natural and anthropogenic habitat variables on Indo-Pacific humpback dolphins Sousa chinensis in Hong Kong Endanger. Species Res. (IF 3.1) Pub Date : 2023-06-15 Thomas A. Jefferson, Elizabeth A. Becker, Shiang-Lin Huang
ABSTRACT: Indo-Pacific humpback dolphins Sousa chinensis in Hong Kong (HK) waters are part of a large (ca. 2000-2500), but declining, population that occurs in the Pearl River Estuary of southern China. To understand the factors that may influence dolphin densities in 4 different parts of HK, a 25 yr (1996-2020) database containing 66439 km of line-transect survey effort and 4052 dolphin sightings
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Adipose tissue estimation of foraging and nesting green turtles Chelonia mydas using bioelectrical impedance analysis Endanger. Species Res. (IF 3.1) Pub Date : 2023-06-15 Sara Kophamel, Leigh C. Ward, Diana Mendez, Ellen Ariel, Ian Bell, Edith Shum, Suzanne L. Munns
ABSTRACT: Adipose tissue is the main energy store in sea turtles and fluctuates in response to dietary conditions and external stressors. Monitoring programmes commonly use body condition indices (BCIs) to infer the nutritional and health status of sea turtle populations. However, BCIs have poor predictive power for estimating adipose tissue. We introduce the use of bioelectrical impedance analysis
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Increasing mortality of Endangered Antillean manatees Trichechus manatus manatus due to watercraft collisions in Belize Endanger. Species Res. (IF 3.1) Pub Date : 2023-06-01 Celeshia Guy Galves, Nicole Auil Gomez, Jamal Galves, Kelly M. Zilliacus, Donald A. Croll, A. Marm Kilpatrick
ABSTRACT: Belize maintains the largest proportion of the Endangered Antillean manatee Trichechus manatus manatus population in its range, but tourism and boat traffic have increased substantially over the past 3 decades. We utilized 25 yr of Belize Antillean manatee stranding data (1995-2019), 6 aerial surveys (1997, 1999, 2000, 2001, 2002, 2014), and 2 decades of boat registration data to examine:
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Quality of thermal refuges influences use by the cold-intolerant Florida manatee Endanger. Species Res. (IF 3.1) Pub Date : 2023-06-01 Catherine G. Haase, Robert J. Fletcher Jr., Daniel H. Slone, James P. Reid, Susan M. Butler
ABSTRACT: Thermal refuges are habitats used by species for behavioral thermoregulation. These habitats can be highly dynamic and are often influenced by fluctuations in local climate. When protected species require thermal refuges, it is necessary to identify stable and high-quality areas by evaluating species use in response to variation in thermal refuge quality. Here, we assessed behavioral thermoregulation
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Demographic response of a high-Arctic polar bear (Ursus maritimus) subpopulation to changes in sea ice and subsistence harvest Endanger. Species Res. (IF 3.1) Pub Date : 2023-05-25 Kristin L. Laidre, Todd W. Arnold, Eric V. Regehr, Stephen N. Atkinson, Erik W. Born, Øystein Wiig, Nicholas J. Lunn, Markus Dyck, Harry L. Stern, Seth Stapleton, Benjamin Cohen, David Paetkau
ABSTRACT: Climate change is a long-term threat to polar bears. However, sea-ice loss is hypothesized to provide transient benefits in high latitudes, where thick multiyear ice historically limited biological productivity and seal abundance. We used joint live-recapture and dead-recovery mark-recapture models to analyze data for one of the most northerly polar bear subpopulations, Kane Basin. The data
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Recent decline of green turtle Chelonia mydas nesting trend at Tortuguero, Costa Rica Endanger. Species Res. (IF 3.1) Pub Date : 2023-05-25 Jaime Restrepo, Emily G. Webster, Iván Ramos, Roldán A. Valverde
ABSTRACT: Trends in abundance of different life stages present important opportunities to manage the conservation of threatened species. For marine turtles, most trend assessments are based on long-term monitoring of nesting aggregations, which provides critical information on rookery dynamics across years. Tortuguero, Costa Rica, is the largest nesting colony of the green turtle Chelonia mydas in
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Ship-strike forecast and mitigation for whales in Gitga’at First Nation territory Endanger. Species Res. (IF 3.1) Pub Date : 2023-05-25 Eric M. Keen, Éadin OMahony, Linda M. Nichol, Brianna M. Wright, Chenoah Shine, Benjamin Hendricks, Hermann Meuter, Hussein M. Alidina, Janie Wray
ABSTRACT: As marine traffic increases globally, ship strikes have emerged as a primary threat to many baleen whale populations. Here we predict ship-strike rates for fin whales Balaenoptera physalus and humpback whales Megaptera novaeangliae in the central territorial waters of the Gitga’at First Nation (British Columbia, Canada), which face increases in existing marine traffic as well as new liquified
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North Atlantic right whale Eubalaena glacialis prey selection in Cape Cod Bay Endanger. Species Res. (IF 3.1) Pub Date : 2023-05-11 Christine A. Hudak, Karen Stamieszkin, Charles A. Mayo
ABSTRACT: North Atlantic right whales Eubalaena glacialis have been observed feeding in Cape Cod Bay (CCB) for over 8 decades, making CCB the most consistent known feeding habitat under shifting ocean and climate conditions. Determining the composition of the right whales’ prey resource in a stable feeding habitat during a period of environmental change will inform conservation efforts throughout their
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Rapid expansion of the golden jackal in Greece: research, management and conservation priorities Endanger. Species Res. (IF 3.1) Pub Date : 2023-05-11 Alexandros A. Karamanlidis, Miguel de Gabriel Hernando, Melina Avgerinou, Wiesław Bogdanowicz, Kiriakos Galanis, Sylvia Kalogeropoulou, Lambros Krambokoukis, Nikolaos Panagiotopoulos, Christos Taklis
ABSTRACT: A rapid and extensive range expansion of the golden jackal has recently been documented in continental Europe, raising new policy and legal questions and creating an urgent need to understand the mechanisms underlying this distribution change. Because of human persecution, the jackal population in Greece went through a serious bottleneck and is therefore now listed as endangered. We used
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Population genetics of freshwater stingray require investigation to confirm DNA contamination: Reply to Alshari et al. (2023) Endanger. Species Res. (IF 3.1) Pub Date : 2023-04-19 Kean Chong Lim, Amy Y. Then
ABSTRACT: Alshari et al. (2023; Endang Species Res 50:311-313) were able to collect 3 Fluvitrygon kittipongi specimens from the Pahang River, which were not available to us at the time of our study (Lim & Then 2022; Endang Species Res 48:43-50). The cytochrome c oxidase I (COI) sequences (or haplotypes) of these 3 stingrays were identical to each other but differed from the haplotypes of our Perak
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DNA contamination and taxonomic diversity hinder eDNA research on freshwater stingray species: Comment on Lim & Then (2022) Endanger. Species Res. (IF 3.1) Pub Date : 2023-04-19 Norli Fauzani Mohd Abu Hassan Alshari, Muhamad Hanif Iryani Bin Adnan, Jamsari Amirul Firdaus Jamaluddin, Sébastien Lavoué, Siti Azizah Mohd Nor
ABSTRACT: Recently, Lim & Then (2022; Endang Species Res 48:43-50) used an environmental DNA (eDNA) PCR-based method for detecting the presence of an endangered species of freshwater stingray, Fluvitrygon kittipongi (Dasyatidae), in the Pahang River basin, east Peninsular Malaysia. For that, they designed a species-specific pair of primers to amplify a 196 base pair (bp) fragment of the cytochrome