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Variation characteristics of ocean sediment Fe levels and their relationship with grain sizes in culture areas over a long period Helgol. Mar. Res. (IF 2.217) Pub Date : 2021-12-02 Zhang, Baoyi, Li, Manyi, An, Maoguo, Zhi, Chenglong, Li, Qingcai, Zhang, Yingmei, Han, Shuangyuan, Zheng, Haitao, Li, Jun, Chen, Huaixin, Chen, Qiao
Iron (Fe) is an essential component for marine ecosystems, and it is related to the growth of phytoplankton communities and environmental evolution in coastal area. However, the effect of aquaculture activities on sediment Fe levels is not well studied. Fe levels and grain sizes are determined in two cores (respectively Core C in the culture area and Core A in the control area) in Sishili Bay to reveal
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Who lives where? Macrobenthic species distribution over sediment types and depth classes in the eastern North Sea Helgol. Mar. Res. (IF 2.217) Pub Date : 2021-11-04 Armonies, Werner
An extensive data set of macrozoobenthos from the eastern North Sea was evaluated in order to describe the distribution of infaunal species with respect to water depth and median grain size of the sediment. The resulting data are presented for 134 species, in 104 species abundance correlated significantly with water depth, with most species decreasing in abundance towards the hydrographically turbulent
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In the Asia-Pacific region, the COI DNA test revealed the divergence of the bivalve mollusc Mactra chinensis into three species; can these species be distinguished using shell coloration and sperm structure? Helgol. Mar. Res. (IF 2.217) Pub Date : 2021-10-30 Reunov, Arkadiy, Lutaenko, Konstantin, Vekhova, Evgenia, Zhang, Junlong, Zakharov, Evgeny, Sharina, Svetlana, Alexandrova, Yana, Reunova, Yulia, Akhmadieva, Anna, Adrianov, Andrey
According to COI DNA barcoding testing, the marine bivalve mollusc Mactra chinensis, which is native to the Asia-Pacific region, diverged into three species. These species were preliminary characterized as M. chinensis COI clade I, M. chinensis COI clade II and M. chinensis COI clade III. To find out whether it is possible to morphologically distinguish samples representing genetic clades, we examined
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Living and dead foraminiferal assemblage from the supratidal sand Japsand, North Frisian Wadden Sea: distributional patterns and controlling factors Helgol. Mar. Res. (IF 2.217) Pub Date : 2021-09-28 Schmidt, Sarina, Schönfeld, Joachim
Supratidal sands are vitally important for coastal defence in the German Wadden Sea. They are less affected by human activities than other areas as they are located far off the mainland shore, touristical and commercial activities are generally prohibited. Therefore, supratidal sands are of high ecological interest. Nevertheless, the faunal inventory and distribution pattern of microorganisms on these
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Benthic community establishment on different concrete mixtures introduced to a German deep-water port Helgol. Mar. Res. (IF 2.217) Pub Date : 2021-06-19 Lydia R. Becker, Ingrid Kröncke, Andreas Ehrenberg, Volkert Feldrappe, Kai Bischof
Concrete is a widely used building material in coastal constructions worldwide. However, limited natural resources used in the production process, as well as high CO2-emission due to the calcination process of limestone and the thermal energy demand for Portland cement clinker production, raise the demand for alternative constituents. Alternative mixture types should be environmentally friendly and
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An example for transatlantic hitchhiking by macrozoobenthic organisms with a research vessel Helgol. Mar. Res. (IF 2.217) Pub Date : 2021-06-03 Michael L. Zettler
In 2019 the RV Meteor cruised from Guadalupe in April/May to Cape Verde in June/July and to Namibia in August/September. The distance is about 10,000 km. The ship has a moon pool for installation of instruments. In Cape Verde we had a first glimpse of the already sparsely populated moon pool. We reached Namibian waters in mid-August. In mid-September, 47 days later and 6000 km south, the ship's moon
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Methods to study organogenesis in decapod crustacean larvae. I. larval rearing, preparation, and fixation Helgol. Mar. Res. (IF 2.217) Pub Date : 2021-06-02 G. Torres, R. R. Melzer, F. Spitzner, Z. Šargač, S. Harzsch, L. Gimenez
Crustacean larvae have served as distinguished models in the field of Ecological Developmental Biology (“EcoDevo”) for many decades, a discipline that examines how developmental mechanisms and their resulting phenotype depend on the environmental context. A contemporary line of research in EcoDevo aims at gaining insights into the immediate tolerance of organisms and their evolutionary potential to
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Methods to study organogenesis in decapod crustacean larvae II: analysing cells and tissues Helgol. Mar. Res. (IF 2.217) Pub Date : 2021-06-02 R. R. Melzer, F. Spitzner, Z. Šargač, M. K. Hörnig, J. Krieger, C. Haug, J. T. Haug, T. Kirchhoff, R. Meth, G. Torres, S. Harzsch
Cells and tissues form the bewildering diversity of crustacean larval organ systems which are necessary for these organisms to autonomously survive in the plankton. For the developmental biologist, decapod crustaceans provide the fascinating opportunity to analyse how the adult organism unfolds from organ Anlagen compressed into a miniature larva in the sub-millimetre range. This publication is the
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Macrofaunal assemblages associated with two common seagrass‐dwelling demosponges (Amorphinopsis atlantica and Haliclona implexiformis) in a tropical estuarine system of the southern Gulf of Mexico Helgol. Mar. Res. (IF 2.217) Pub Date : 2021-02-16 Antony E. Briceño-Vera, Enrique Ávila, María A. Rodríguez-Santiago, Alejandro Ruiz-Marín
Among the ecological roles that sponges play in marine ecosystems, one of the highlights is their ability to host a wide diversity and abundance of epibenthic organisms. However, of the different marine environments, this role has been less investigated in seagrass-dwelling sponges. In this study, the main objective was to determine whether the structure of the associated faunal assemblages in two
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Diversity of mangrove root-dwelling sponges in a tropical coastal ecosystem in the southern Gulf of Mexico region Helgol. Mar. Res. (IF 2.217) Pub Date : 2020-12-02 Pedro de Jesús Castellanos-Pérez, Laura Elena Vázquez-Maldonado, Enrique Ávila, José Antonio Cruz-Barraza, Julio César Canales-Delgadillo
Sponges are one of the most conspicuous groups of epibionts in mangrove prop root habitats. However, with the exception of the Caribbean and the Indo-Pacific regions, studies focused on species diversity are lacking in other locations that have high mangrove coverage and are relatively distant from coral reef environments. Because mangrove-root epibiont communities, in general, have been understudied
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Ovary resorption in the Norway lobster (Nephrops norvegicus) and its possible causes with special reference to sperm storage Helgol. Mar. Res. (IF 2.217) Pub Date : 2020-10-27 Carola Becker, Jaimie T. A. Dick, E. Mánus Cunningham, Mathieu Lundy, Ewen Bell, Lawrence Eagling, Julia D. Sigwart
The Norway lobster, Nephrops norvegicus, is an important fisheries species in the North-East Atlantic area. In some circumstances, mature females of Nephrops norvegicus can resorb their ovary rather than completing spawning, but the implications of this phenomenon to reproductive biology and fisheries sustainability are not known. To understand after effects of ovary resorption, we studied long-term
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Culture of benthic diatom Nitzschia sp. with macroalgae carriers and its application as feed of juveniles Stichopus japonicus Helgol. Mar. Res. (IF 2.217) Pub Date : 2020-10-16 Aili Jiang, Heng Ji, Hengxu Liu, Huimin Zhu, Guofeng Ai, Xiaochen Guo
Carrier culture is the combination of suspension culture and adherent culture. Carriers could be used to improve the culture efficiency of large-scale culture of adherent benthic diatom. In order to identify a suitable carrier for mass suspension culture of the benthic diatoms Nitzschia sp. powders of seven macroalgae were used as carriers for diatom attachment including Ulva pertusa, degummed Laminaria
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Changes in thiamine concentrations, fatty acid composition, and some other lipid-related biochemical indices in Baltic Sea Atlantic salmon (Salmo salar) during the spawning run and pre-spawning fasting Helgol. Mar. Res. (IF 2.217) Pub Date : 2020-08-28 Pekka J. Vuorinen, Mervi Rokka, Tiina Ritvanen, Reijo Käkelä, Soili Nikonen, Tapani Pakarinen, Marja Keinänen
Salmonines in the Baltic Sea and North American lakes suffer from thiamine (vitamin B1) deficiency, which is connected to an abundant lipid-rich diet containing substantial amounts of polyunsaturated fatty acids (PUFAs). In the Baltic region, this is known as the M74 syndrome. It affects both adult salmon (Salmo salar) and especially their offspring, impairing recruitment. However, very little is known
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A cross-genus comparison of grazing pressure by two native marine herbivores on native, non-native naturalized, and non-native invasive Sargassum macroalgae Helgol. Mar. Res. (IF 2.217) Pub Date : 2020-08-12 Nikolas J. Kaplanis, Jill L. Harris, Jennifer E. Smith
In marine systems, algal abundance and community composition is often heavily influenced by top-down control by herbivores. As a result, examining the extent to which native herbivores exert grazing pressure on non-native marine algae can provide valuable insight into mechanisms controlling invasion success. The purpose of this study was to examine the grazing preferences of two common intertidal and
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Giant planktic larvae of anomalan crustaceans and their unusual compound eyes Helgol. Mar. Res. (IF 2.217) Pub Date : 2020-08-06 Paula Gundi, Chiara Cecchin, Lara-Leonie Fetzer, Carolin Haug, Roland R. Melzer, Joachim T. Haug
Crustacean larvae are usually recognised as small organisms, below one millimeter body size. However, in different crustacean groups such as Stomatopoda, Polychelida, or Achelata, also very large larvae occur with sizes of 20 mm and beyond. Also from few meiuran species (“short-tailed” crustaceans, including crabs, hermit crabs, or squat lobsters), rather large larvae are known, though still considerably
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Micro- and mesozooplankton at the edges of coastal tropical reefs (Tamandaré, Brazil) Helgol. Mar. Res. (IF 2.217) Pub Date : 2020-05-22 Morgana Brito-Lolaia, Gleice S. Santos, Sigrid Neumann-Leitão, Ralf Schwamborn
Tropical reef ecosystems are generally considered to be sinks of marine zooplankton, mainly due to the predation by scleractinian corals and other planktivores. The present study aims to evaluate the zooplankton community of a coastal reef in two specific environments: the reef edge and open-water channels between patch reefs. Sampling was carried out at two patch reefs that border the Tamandaré coastal
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Reproduction of the endangered endemic saffron coral to the Gulf of California Porites sverdrupi (Anthozoa: Scleractinia): implications for its long-term maintenance Helgol. Mar. Res. (IF 2.217) Pub Date : 2020-05-12 Violeta Martínez-Castillo, Alma Paola Rodríguez-Troncoso, Héctor Reyes-Bonilla, Carlos Augusto Aguilar-Cruz, Carlos Rangel-Dávalos
The biology of the scleractinian Porites sverdrupi, endemic to the Gulf of California, is poorly studied. In order to fill that gap, the present study documents the reproductive biology of this coral which is to date protected by the IUCN’s as “vulnerable” and listed as “in risk of extinction” in the Mexican Federal Law for species protection. Also, potential distribution models were constructed to
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Timing of the reproductive cycle of waved whelk, Buccinum undatum, on the U.S. Mid-Atlantic Bight Helgol. Mar. Res. (IF 2.217) Pub Date : 2020-03-02 Sarah Borsetti, Daphne Munroe, David Rudders, Jui-Han Chang
Development of the unmanaged waved whelk (Buccinum undatum) fishery on the Mid-Atlantic continental shelf of the United States has initiated investigation into fisheries-related biological and population attributes of the species in this region. Maturation and reproduction timing vary by location for this species and are likely linked to bottom water temperature. This study examined the seasonal fluctuations
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Antifouling and antibacterial activities of bioactive extracts from different organs of the sea cucumber Holothuria leucospilota Helgol. Mar. Res. (IF 2.217) Pub Date : 2020-02-06 Mehrnoosh Darya, Mir Masoud Sajjadi, Morteza Yousefzadi, Iman Sourinejad, Maaroof Zarei
In this study, antifouling and antibacterial properties of polar, semi polar and non-polar bioactive compounds derived from the sea cucumber Holothuria leucospilota were investigated. A series comprising n-hexane, ethyl acetate and methanol extracts from four different organs of sea cucumber (body wall, gonad, digestive tract and respiratory tree) were investigated for their antibacterial and antifouling
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Combined effects of ocean acidification and hypoxia on the early development of the thick shell mussel Mytilus coruscus Helgol. Mar. Res. (IF 2.217) Pub Date : 2020-01-24 Xinghuo Wang, Yueyong Shang, Hui Kong, Menghong Hu, Jinlong Yang, Yuewen Deng, Youji Wang
Ocean acidification has become serious, and seawater hypoxia has become evident in acidified waters. The combination of such stressors may have interactive effects on the fitness of marine organisms. In order to investigate the interactive effects of seawater acidification and hypoxia on the early development of marine bivalves, the eggs and sperm of the thick shell mussel Mytilus coruscus were exposed
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Age and growth of Glycymeris longior (Sowerby, 1832) clam at the southern edge of its distribution (Argentine Sea) Helgol. Mar. Res. (IF 2.217) Pub Date : 2020-01-13 Lucas H. Gimenez, María del Socorro Doldan, Paula C. Zaidman, Enrique M. Morsan
Even though Glycymeris longior is a clam widely distributed in the SW Atlantic Ocean, little is known about its biology and life history. The present study assessed the periodicity of the internal growth increments of G. longior using thin shell sections. Each internal growth increment was composed of two alternating bands: a translucent band (light-coloured when viewed with transmitted light) and
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Analysing long-term change in small benthos: geomorphological dynamics affects method selection Helgol. Mar. Res. (IF 2.217) Pub Date : 2020-01-13 Werner Armonies
In the tidal inlets of the northern Wadden Sea, species composition of selected taxa of the small benthos is compared to a study performed some 35 years before, using the same methods and sampling the same sites. Site-by-site comparisons suggest a dramatic change in community composition at a local scale. However, geomorphology is highly dynamic in this area, and sediment composition, water depth,
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An invasive alien bivalve apparently provides a novel food source for moulting and wintering benthic feeding sea ducks Helgol. Mar. Res. (IF 2.217) Pub Date : 2019-12-19 Johanna Kottsieper, Philipp Schwemmer, Nele Markones, Anthony D. Fox, Stefan Garthe
Since its introduction from North America in the 1970s, the American razor clam Ensis leei (M. Huber, 2015) has successfully spread throughout North Sea coasts from Spain to Norway and the United Kingdom to the western Baltic. We investigated the distribution and abundance of this non-indigenous bivalve species as a potential novel food resource for common scoter Melanitta nigra (Linnaeus, 1758) along
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Cuttlebone morphometrics and sex identification of Sepia bertheloti (d’Orbigny, 1835) from the central-east Atlantic Helgol. Mar. Res. (IF 2.217) Pub Date : 2019-10-23 Airam Guerra-Marrero, David Jiménez-Alvarado, Vicente Hernández-García, Leticia Curbelo-Muñoz, José Juan Castro-Hernández
Analysis of 322 cuttlebones of Sepia bertheloti caught in the waters of the Northwest Africa showed significant differences in growth between males and females. Morphometric analysis revealed a relatively different cuttlebone growth pattern between sexes, with males presenting faster growth in length to reach larger sizes and females displaying greater growth in width. This difference in cuttlebone
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An updated phytoplankton check-list for the Helgoland Roads time series station with eleven new records of diatoms and dinoflagellates Helgol. Mar. Res. (IF 2.217) Pub Date : 2019-10-08 Alexandra Kraberg, Ute Kieb, Silvia Peters, Karen Helen Wiltshire
The Helgoland Roads time series is one of the longest and most detailed time series in the world. It comprises daily phytoplankton counts accompanied by physico-chemical measurements. As such, it provides valuable long-term record of changes and their underlying causes in the phytoplankton community around Helgoland. This work provides an updated check-list of the phytoplankton species encountered
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An exclusion experiment to study the influence of habitat structure provided by Mussismilia corals (Cnidaria; Anthozoa) on the predation of associated crustaceans Helgol. Mar. Res. (IF 2.217) Pub Date : 2019-09-23 Marcos M. Nogueira, Elizabeth Neves, Rodrigo Johnsson
Predation is an interaction between species that influences community organisation by the direct consumption of prey, influencing prey numbers, behaviours and traits. The intensity of predation is greatly influenced by the environment, and the physical structure of habitats may influence predation intensity by providing refuge for prey or reducing the foraging efficiency of predators. In this context
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Evaluating the potential impact of bird predation on the SW Atlantic fiddler crab Leptuca uruguayensis Helgol. Mar. Res. (IF 2.217) Pub Date : 2019-09-23 Pablo D. Ribeiro, Diego D. Navarro, Luciano M. Jaureguy, Pedro Daleo, Oscar O. Iribarne
The southernmost permanent population of the fiddler crab Leptuca uruguayensis occurs along the Samborombón Bay (36°22′S, 56°45′W, Argentina), an important feeding site for many bird species, including ruddy turnstones (Arenaria interpres), whimbrels (Numenius phaeopus), grey plovers (Pluvialis squatarola), american golden plovers (Pluvialis dominica) and gull-billed terns (Gelochelidon nilotica).
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Is food supply for shellfish-eating birds in the western Wadden Sea affected by the between-species synchrony in year-to-year fluctuations of bivalve population parameters? Helgol. Mar. Res. (IF 2.217) Pub Date : 2019-09-23 J. J. Beukema, R. Dekker
For a better understanding of functioning and stability of ecosystems, it is important to know to what extent constituent species show similarity in their long-term fluctuation patterns, i.e. whether their numbers and biomass frequently show simultaneous peaks and lows. Synchronic peaks and lows of important species would enhance variability in the functioning of the entire system and might affect
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Effects of elevated temperature and sedimentation on grazing rates of the green sea urchin: implications for kelp forests exposed to increased sedimentation with climate change Helgol. Mar. Res. (IF 2.217) Pub Date : 2019-09-11 Sarah B. Traiger
Sea urchin grazing rates can strongly impact kelp bed persistence. Elevated water temperature associated with climate change may increase grazing rates; however, these effects may interact with local stressors such as sedimentation, which may inhibit grazing. In Alaska, glacial melt is increasing with climate change, resulting in higher sedimentation rates, which are often associated with lower grazer
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Progress and perspectives in the discovery of polychaete worms (Annelida) of the world Helgol. Mar. Res. (IF 2.217) Pub Date : 2019-05-03 Joko Pamungkas, Christopher J. Glasby, Geoffrey B. Read, Simon P. Wilson, Mark J. Costello
Despite the availability of well-documented data, a comprehensive review of the discovery progress of polychaete worms (Annelida) has never been done. In the present study, we reviewed available data in the World Register of Marine Species, and found that 11,456 valid species of Recent polychaetes (1417 genera, 85 families) have been named by 835 first authors since 1758. Over this period, three discovery
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Satellite observations of the effect of the “Godzilla El Niño” on the Tehuantepec upwelling system in the Mexican Pacific Helgol. Mar. Res. (IF 2.217) Pub Date : 2019-04-22 Erik Coria-Monter, David Alberto Salas de León, María Adela Monreal-Gómez, Elizabeth Durán-Campos
During 2015–2016, a strong El Niño, the “Godzilla El Niño,” which is similar to El Niño events that occurred in 1982/1983 and 1997/1998, occurred in the Pacific Ocean. In this paper, we report on the influence of the “Godzilla El Niño” on the sea surface temperature (SST) and chlorophyll-a (Chla) concentrations in the Tehuantepec upwelling system using satellite observation data. A time-series of the
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Dual culture of the oomycete Lagenisma coscinodisci Drebes and Coscinodiscus diatoms as a model for plankton/parasite interactions Helgol. Mar. Res. (IF 2.217) Pub Date : 2019-04-16 Anthony Buaya, Alexandra Kraberg, Marco Thines
Diatoms are thought to provide about 40% of total global photosynthesis and diatoms of the genus Coscinodiscus are an important, sometimes dominant, cosmopolitan component of the marine diatom community. The oomycete parasitoid Lagenisma coscinodisci is widespread in the northern hemisphere on its hosts in the genus Coscinodiscus. Because of its potential ecological importance, it would be a suitable
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Parasites of fish Poecilia velifera and their potential as bioindicators of wetland restoration progress Helgol. Mar. Res. (IF 2.217) Pub Date : 2019-01-17 Francisco N. Morales-Serna, María A. Rodríguez-Santiago, Rolando Gelabert, Luz M. Flores-Morales
Fish harbor a high diversity of parasites that play an important role for the ecosystem. Because these parasites have different life-cycle traits, changes in their populations or communities may provide useful information related to ecosystem health. Highly stressful conditions may reduce parasite communities or populations. However, it is not a rule since host-parasite interactions are hardly predictable
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Population genetics of Bursatella leachii (De Blainville, 1817) and implications for the origin of the Mediterranean population Helgol. Mar. Res. (IF 2.217) Pub Date : 2018-11-28 Enrico Bazzicalupo, Fabio Crocetta, Ka‘ala Estores-Pacheco, Haleh Golestani, Hocein Bazairi, Salvatore Giacobbe, Andrej Jaklin, Dimitris Poursanidis, B. K. Sneha Chandran, Juan Lucas Cervera, Ángel Valdés
The sea hare Bursatella leachii (de Blainville 1817) (Mollusca: Gastropoda: Heterobranchia: Aplysiidae) is a pantropical sea slug that has colonized the Mediterranean Sea in modern times. Because the initial records in the non-native range started in the Eastern Mediterranean, and its pattern of spread was relatively consistent with those observed in well-known Lessepsian invaders, B. leachii is commonly
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Uncharted biodiversity in the marine benthos: the void of the smallish with description of ten new Platyhelminth taxa from the well-studied North Sea Helgol. Mar. Res. (IF 2.217) Pub Date : 2018-11-10 Werner Armonies
Most of our planet’s biodiversity is still unknown, particularly in the sea. Although around the island of Sylt in the North Sea, the small zoobenthos (meiofauna) has been studied intensively since the 1950s, repeating previous surveys revealed an unexpected wealth of new species in addition to the 330 species of free-living microturbellarians (non-parasitic Platyhelminthes) already known from this
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Neohelice granulata burrow fidelity behaviour related to landscape heterogeneity Helgol. Mar. Res. (IF 2.217) Pub Date : 2018-11-07 J. D. Nuñez, P. D. Ribeiro, E. H. Ocampo, T. A. Luppi
Neohelice granulata provides an interesting animal model for studying behavioural process because it is widely distributed, ensuring variability related to different environmental conditions. The aim of this study was to analyse variation in site fidelity with relation to landscape heterogeneity. Field observations were carried out in three geographically distant marshes in Argentina (Mar Chiquita
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Genetic and morpho-physiological differentiation in a limpet population across an intertidal gradient Helgol. Mar. Res. (IF 2.217) Pub Date : 2018-11-03 Jesús Darío Nuñez, Pedro Fernández Iriarte, Emiliano Hernán Ocampo, Enrique Madrid, Maximiliano Cledón
Marine organism adaptive capacity to different environmental conditions is a research priority to understand what conditions are important in structuring the spatial distribution of natural populations. In this context, this study evaluates whether potential differences in Siphonaria lessonii morphology (size and shell shape) and physiology (water loss regulation) at different shore heights are linked
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Variability in the settlement of non-indigenous species in benthic communities from an oceanic island Helgol. Mar. Res. (IF 2.217) Pub Date : 2018-10-04 Léa Riera, Patrício Ramalhosa, João Canning-Clode, Ignacio Gestoso
The introduction of non-indigenous species (NIS) in new environments represents a major threat for coastal ecosystems. A good understanding of the mechanisms and magnitude of the impact of NIS colonisation on native ecosystems is becoming increasingly crucial to develop mitigation measures and prevent new invasions. In this present study, we asked if distinct coastal benthic communities from an oceanic
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Nudibranchs out of water: long-term temporal variations in the abundance of two Dendrodoris species under emersion Helgol. Mar. Res. (IF 2.217) Pub Date : 2018-08-27 Ricardo Cyrne, Inês C. Rosa, Filipa Faleiro, Gisela Dionísio, Miguel Baptista, Ana Couto, Marta Pola, Rui Rosa
The sudden appearance and disappearance of nudibranchs in intertidal areas have puzzled researchers all over the world, giving rise to a great diversity of theories to explain it. Here we conducted a five-year survey to evaluate seasonal changes in the abundance of Dendrodoris herytra and D. grandiflora in the Sado estuary (Portugal) and to explore a possible relationship with environmental factors
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First record of the non-indigenous jellyfish Blackfordia virginica (Mayer, 1910) in the Baltic Sea Helgol. Mar. Res. (IF 2.217) Pub Date : 2018-08-01 Cornelia Jaspers, Bastian Huwer, Nancy Weiland-Bräuer, Catriona Clemmesen
Marine invasions are of increasing concern for biodiversity conservation worldwide. Gelatinous macrozooplankton contain members, which have become globally invasive, for example the ctenophore Mnemiopsis leidyi or the hydromedusae Blackfordia virginica. B. virginica is characterised by a large salinity tolerance, with a brackish-water habitat preference, and by a metagenic life history strategy with
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The illusion of rarity in an epibenthic jellyfish: facts and artefacts in the distribution of Tesserogastria musculosa (Hydrozoa, Ptychogastriidae) Helgol. Mar. Res. (IF 2.217) Pub Date : 2018-06-27 Luis Martell, Anne Helene S. Tandberg, Aino Hosia
Epibenthic and benthopelagic medusae are rarely collected by standard benthic or pelagic sampling methods, and many species are considered uncommon and geographically restricted. Peer-reviewed scientific literature contains only two records of medusae belonging to the monotypic genus Tesserogastria Beyer, 1958 since their original description, both from the vicinity of the type locality in Oslofjord
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Microscopic species make the diversity: a checklist of marine flora and fauna around the Island of Sylt in the North Sea Helgol. Mar. Res. (IF 2.217) Pub Date : 2018-06-26 Werner Armonies, Harald Asmus, Christian Buschbaum, Dagmar Lackschewitz, Karsten Reise, Johannes Rick
Based on the past 150 years of research and ongoing time-series observations we give a comprehensive overview of marine species composition around the island of Sylt in the eastern North Sea. A total of 2758 species is listed according to the categories microplankton (591 species), zooplankton (137), nekton (118), benthic microflora (158), benthic macroflora (125), benthic micro-and meiofauna (1204)
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Does rock type account for variation in mussel attachment strength? A test with Brachidontes rodriguezii in the southwestern Atlantic Helgol. Mar. Res. (IF 2.217) Pub Date : 2018-06-26 Jorge L. Gutiérrez, María Bagur, Lorena P. Arribas, M. Gabriela Palomo
Mussel attachment strength varies in space and time, frequently in association with variations in wave exposure. Yet, it remains uninvestigated whether different rock types can contribute to variation in mussel attachment. Here we compared the attachment strength of the mussel Brachidontes rodriguezii between soft and hard intertidal rock substrates that are typical of coastal Buenos Aires Province
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Wulf Greve (1942–2018) Helgol. Mar. Res. (IF 2.217) Pub Date : 2018-06-11 Karen H. Wiltshire, Dieter Hanelt, Maarten Boersma
It is with great sadness that we bid farewell to our esteemed colleague, Dr. Wulf Greve, who passed away on the 26th of January 2018. Wulf Greve was one of the founding fathers of zooplankton research at the Biologische Anstalt Helgoland (BAH). When Wulf arrived to do his Ph.D. in the nineteen sixties the BAH was already more than 75 years old and, strangely, no one had seriously worked on zooplankton
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Variation of sperm morphology in Pacific oyster precludes its use as a species marker but enables intraspecific geo-authentification and aquatic monitoring Helgol. Mar. Res. (IF 2.217) Pub Date : 2018-06-06 Arkadiy Reunov, Evgenia Vekhova, Evgeny Zakharov, Yulia Reunova, Yana Alexandrova, Svetlana Sharina, Andrey Adrianov
According to recent reports, shell morphology is unreliable for the identification of oysters because of the high phenotypic plasticity of these bivalves. Using COI DNA barcoding and sperm morphology, we reinvestigated the species validity of wild Pacific oyster Crassostrea gigas habituating the Peter the Great Bay (Sea of Japan). DNA barcoding confirmed the species validity of samples collected. Application
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Mysterious and elaborated: the reproductive behavior of the rhomboid mojarra, Diapterus rhombeus (Cuvier, 1829), in Brazilian mangrove habitats Helgol. Mar. Res. (IF 2.217) Pub Date : 2018-05-31 José Amorim Reis-Filho, Antoine O. H. C. Leduc
Many fish species have behavioral traits related to reproduction that aim to improve egg conditions and survival of early life stages. Here, we provide the first detailed description of reproductive strategies performed by the rhomboid mojarra, Diapterus rhombeus. We based this description on several mating events, which occurred in mangroves located in Todos os Santos Bay, Brazil. These spawning events
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Is the Wild Coast in eastern South Africa a distinct marine bioregion? Helgol. Mar. Res. (IF 2.217) Pub Date : 2018-05-14 Candice M. Jooste, Jody Oliver, Arsalan Emami-Khoyi, Peter R. Teske
The South African coastline can be divided into at least four temperature-defined marine bioregions, including the tropical north-east coast, the subtropical east coast, the warm-temperate south coast, and the cool-temperate west coast. There are also two biogeographical transition zones, the south-west coast and the south-east coast (or Wild Coast). The former is sometimes considered a distinct marine
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An annotated checklist of macrozoobenthic species in German waters of the North and Baltic Seas Helgol. Mar. Res. (IF 2.217) Pub Date : 2018-04-26 Michael L. Zettler, Jan Beermann, Jennifer Dannheim, Brigitte Ebbe, Michael Grotjahn, Carmen-Pia Günther, Manuela Gusky, Britta Kind, Ingrid Kröncke, Ralph Kuhlenkamp, Claus Orendt, Eike Rachor, Anja Schanz, Alexander Schröder, Lisa Schüler, Jan Witt
The present compilation is the first attempt to generate a comprehensive list of all macrozoobenthic species recorded at least once in the German regions of the North Sea and Baltic Sea including non-indigenous species and freshwater species which occurred in brackish waters (estuaries, bays, fjords etc.). Based on the data of several research institutes and consultancies, the macrozoobenthic species
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The colonial ascidian Diplosoma listerianum enhances the occurrence of the hydrozoan Obelia sp. during early phases of succession Helgol. Mar. Res. (IF 2.217) Pub Date : 2018-03-27 I. Krüger, M. Lenz, M. Thiel
Recruitment patterns of sessile species often do not reflect the composition of the local propagule pool. This is, among other processes, attributed to the stimulation or inhibition of settlement by resident species. In an experimental study, we evaluated the effects of different densities of the ascidian Diplosoma listerianum on the settlement of the hydrozoan Obelia sp. For this, we monitored the
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The influence of season and the tidal cycle on division of labour by the radula during feeding in the estuarine brooding gastropod Crepipatella dilatata (Calyptraeidae) Helgol. Mar. Res. (IF 2.217) Pub Date : 2018-02-06 O. R. Chaparro, J. A. Montory, C. J. Segura, V. M. Cubillos, L. P. Salas-Yanquin, R. J. Thompson
The brooding gastropod Crepipatella dilatata can feed by scraping the substrate with the radula and by suspension-feeding, which also requires use of the radula. There is a “division of labour” for the radula among three discrete tasks associated with feeding: (1) removing mucous balls from the food pouch; (2) transferring the mucous cord from the neck channel to the mouth (both components of suspension-feeding);
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Follower fish of the goldspotted eel Myrichthys ocellatus with a review on anguilliform fish as nuclear species Helgol. Mar. Res. (IF 2.217) Pub Date : 2018-01-16 Maria L. F. Ternes, Vinicius J. Giglio, Thiago C. Mendes, Pedro H. C. Pereira
In a nuclear-follower fish foraging association, the follower benefits from food uncovered or flushed out when the nuclear fish disturbs the bottom, while nuclear species generally do not seem to be benefiting. Among nuclear species, eels (anguilliform fish) are known to be one of the most represented groups. Here we investigated the frequency and time duration of foraging associations among the goldspotted
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Site fidelity and population structure of blue land crabs (Cardisoma guanhumi Latreille, 1825) in a restricted-access mangrove area, analyzed using PIT tags Helgol. Mar. Res. (IF 2.217) Pub Date : 2018-01-04 Denise Moraes-Costa, Ralf Schwamborn
Understanding the patterns of displacement and site fidelity in blue land crabs (Cardisoma guanhumi Latreille, 1825) has important implications for their conservation and management. The central objective of this study was to analyze seasonal variations in site fidelity in C. guanhumi, a species that is intensively exploited in Brazil, in spite of being part of the Official National List of Critically
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Viral dynamics in two trophically different areas in the Central Adriatic Sea Helgol. Mar. Res. (IF 2.217) Pub Date : 2017-11-02 Marin Ordulj, Nada Krstulović, Danijela Šantić, Slaven Jozić, Mladen Šolić
To understand the activity of marine viruses, experiments on viral production, viral decay and the percentage of lytic and lysogenic bacterial cells among the total number of bacterial cells were carried out seasonally at two stations in the Adriatic Sea with different trophic conditions. Additionally, we are providing an insight on the enrichment with dissolved and particulate organic matter by viral
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Cost/benefit and the effect of sample preservation procedures on quantitative patterns in benthic ecology Helgol. Mar. Res. (IF 2.217) Pub Date : 2017-10-27 Gabriel Barros Gonçalves de Souza, Francisco Barros
Some benthic assemblages studies have tested the effects of different preservation procedures on biomass, but their influence on quantitative patterns (number of species and abundance) is still unclear. We evaluated the influence of two sample preservation procedures on quantitative patterns in benthic ecology. Ten sampling points were systematically interspersed on two types of sediment (sandy and
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Spatial variation of reef fishes and the relative influence of biotic and abiotic habitat traits Helgol. Mar. Res. (IF 2.217) Pub Date : 2017-10-17 Iacopo Bertocci, I. Sousa-Pinto, P. Duarte
Patterns of distribution of reef fishes were examined across three spatial scales and related to habitat traits along 25 km of the northern Portuguese coast. Response variables included the multivariate assemblage structure, the total number of taxa and individuals, and the abundance of single groups categorized according to their preference for the benthic, proximo-benthic or pelagic environment,
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Non-indigenous species (NIS) of polychaetes (Annelida: Polychaeta) from the Atlantic and Mediterranean coasts of the Iberian Peninsula: an annotated checklist Helgol. Mar. Res. (IF 2.217) Pub Date : 2017-10-10 E. López, A. Richter
This study provides an updated catalogue of non-indigenous species (NIS) of polychaetes reported from the continental coasts of the Iberian Peninsula based on the available literature. A list of 23 introduced species were regarded as established and other 11 were reported as casual, with 11 established and nine casual NIS in the Atlantic coast of the studied area and 14 established species and seven
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Dynamics of a Limecola (Macoma) balthica population in a tidal flat area in the western Wadden Sea: effects of declining survival and recruitment Helgol. Mar. Res. (IF 2.217) Pub Date : 2017-10-10 J. J. Beukema, R. Dekker, J. Drent
We followed the dynamics of the population of the bivalve Limecola (Macoma) balthica in the westernmost part of the Wadden Sea by monitoring for 44 years (1973–2016) its numbers and age composition at 15 sites in a 50-km2 tidal-flat area. During the first half of this period, the annual recruitment and adult survival were at a relatively constant level, resulting in rather constant numbers. During
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Host-use pattern of the shrimp Periclimenes paivai on the scyphozoan jellyfish Lychnorhiza lucerna: probing for territoriality and inferring its mating system Helgol. Mar. Res. (IF 2.217) Pub Date : 2017-10-10 J. Antonio Baeza, Samara de Paiva Barros-Alves, Rudá Amorim Lucena, Silvio Felipe Barbosa Lima, Douglas Fernandes Rodrigues Alves
In symbiotic crustaceans, host-use patterns vary broadly. Some species inhabit host individuals solitarily, other species live in heterosexual pairs, and even other species live in aggregations. This disparity in host-use patterns coupled with considerable differences in host ecology provide opportunities to explore how environmental conditions affect animal behavior. In this study, we explored whether
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Distribution patterns of epilithic diatoms along climatic, spatial and physicochemical variables in the Baltic Sea Helgol. Mar. Res. (IF 2.217) Pub Date : 2017-09-19 Leena Virta, Janne Soininen
The species richness and community composition of the diatom communities were studied in the Baltic Sea, Northern Europe, to enhance knowledge about the diversity of these organisms in a brackish water ecosystem. Many organisms in the Baltic Sea have been studied extensively, but studies investigating littoral diatoms are scarce. The goal of this study was to examine the importance of climatic, spatial
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Fatty acid compositions associated with high-light tolerance in the intertidal rhodophytes Mastocarpus stellatus and Chondrus crispus Helgol. Mar. Res. (IF 2.217) Pub Date : 2017-08-02 Kristina Koch, Wilhelm Hagen, Martin Graeve, Kai Bischof
The rhodophytes Mastocarpus stellatus and Chondrus crispus occupy the lower intertidal zone of rocky shores along North Atlantic coastlines, with C. crispus generally occurring slightly deeper. Consequently, M. stellatus is exposed to more variable environmental conditions, related to a generally higher stress tolerance of this species. In order to extend our understanding of seasonal modulation of