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Deciphering the many maps of the Xingu River Basin – an assessment of land cover classifications at multiple scales Proc. Acad. Nat. Sci. Philadelphia (IF 1.0) Pub Date : 2020-11-01 Margaret Kalacska; J. Pablo Arroyo-Mora; Oliver Lucanus; Leandro Sousa; Tatiana Pereira; Thiago Vieira
Remote sensing is an invaluable tool to objectively illustrate the rapid decline in habitat extents worldwide. The many operational Earth Observation platforms provide options for the generation of land cover maps, each with unique characteristics and considerable semantic differences in the definition of classes. As a result, differences in baseline estimates are inevitable. Here we compare forest
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More than Fish – The Potential of Baited Remote Underwater Video to Assess Freshwater Herpetofauna and Dolphins Proc. Acad. Nat. Sci. Philadelphia (IF 1.0) Pub Date : 2019-10-01 Kurt Schmid; Tommaso Giarrizzo
We discuss new applications of baited remote underwater video (BRUV) systems based on recordings of Amazonian freshwater fauna during a long-term fish monitoring program in the Xingu River, Brazil. BRUVs facilitated estimates of relative abundance and frequency of occurrence for species of river turtles (Podocnemis unifilis, P. expansa, Rhinoclemmys punctularia), river dolphin (Inia geoffrensis) and
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Body shape separates guilds of rheophilic herbivores (Myleinae: Serrasalmidae) better than feeding morphology Proc. Acad. Nat. Sci. Philadelphia (IF 1.0) Pub Date : 2019-07-01 Jonathan M. Huie; Adam P. Summers; Matthew A. Kolmann
Herbivorous fishes feed on stems, leaves, flowers, seeds, fruits, and nuts of diverse aquatic plants, as well as algae. Pacus are the herbivorous cousins of piranhas and consume a myriad of diets comprised of these plant products, but a few species are phytophages, herbivores that feed almost exclusively on rapids-dwelling (rheophilic) riverweed plants from the family Podostemaceae. The degree to which
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Bryconops rheorubrum (Characiformes: Iguanodectidae), new species from the Rio Xingu Rapids, Brazil Proc. Acad. Nat. Sci. Philadelphia (IF 1.0) Pub Date : 2019-06-01 Cárlison Silva-Oliveira; Mark Henry Sabaj; Rafaela Priscila Ota; Lúcia H. Rapp Py-Daniel
A new species of Bryconops is described from the rio Xingu Basin, Brazil, that differs from all congeners by the following combination of characters: predorsal scales 8–9, perforated scales in the lateral line 43–45, and pigmentation pattern composed of wide silvery midlateral band on body, hyaline dorsal and anal fins (in alcohol), and dark blotch on distal half of dorsal caudal-fin lobe. The new
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A new Creagrutus from the upper rio Xingu basin, Brazil (Teleostei: Characiformes: Characidae) Proc. Acad. Nat. Sci. Philadelphia (IF 1.0) Pub Date : 2019-05-01 Nelson Flausino Jr.; Flávio C.T. Lima
A new species of Creagrutus is described from the upper rio Xingu basin, Mato Grosso state, Brazil. The new species can be distinguished from its congeners by a combination of characters that includes dorsal fin mostly black, a dark oblique blotch on middle and upper-inferior caudal-fin rays, and presence of only two rows of premaxillary teeth. Creagrutus mucipu, formerly known only from the upper
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Sponge and mollusk associations in a benthic filter-feeding assemblage in the middle and lower Xingu River, Brazil Proc. Acad. Nat. Sci. Philadelphia (IF 1.0) Pub Date : 2019-02-01 Cecilia Volkmer-Ribeiro; Maria Cristina Dreher Mansur; Daniel Pereira; Jeremy S. Tiemann; Kevin S. Cummings; Mark Henry Sabaj
During a pilot survey, sponges and mollusks were sampled from the bottom of the middle Xingu River (rapids) and lower Xingu River (ria) via hand-picking in shallows and trawling and surface-supplied dives in deeper waters. The survey revealed a benthic community composed of eight sponge species in four genera and three families, and added six species to the Xingu Basin fauna. Sponges exhibited distinct
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Morphological assessment of Rheodreissena (Bivalvia: Veneroida: Dreissenidae) with an updated diagnosis of the genus, descriptions of two new species, redescription of R. lopesi, and the first account of larval brooding in New World dreissenids Proc. Acad. Nat. Sci. Philadelphia (IF 1.0) Pub Date : 2019-01-01 Maria Cristina Dreher Mansur; Daniel Pereira; Paulo Eduardo Aydos Bergonci; Daniel Mansur Pimpão; José Ricardo de Souza Barradas; Mark Henry Sabaj
RheodreissenaGeda et al. 2018, a recently described genus of Dreissenidae, is represented by living species that inhabit inland freshwaters of Brazil and Venezuela. The type species of Rheodreissena is R. hoeblichi (Schütt 1991a) described from the lower Orinoco basin, Venezuela. Three species are added in this study: R. lopesi (Alvarenga & Ricci, 1989) from the Tocantins and Xingu basins; R. cordilineata
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Platydoras birindellii, new species of striped raphael catfish (Siluriformes: Doradidae) from the Xingu Basin, Brazil Proc. Acad. Nat. Sci. Philadelphia (IF 1.0) Pub Date : 2018-06-01 Leandro M. Sousa; Mateus S. Chaves; Alberto Akama; Jansen Zuanon; Mark Henry Sabaj
A new species of Platydoras is described from the rio Xingu Basin, Brazil. Platydoras birindellii is distinguished from congeners by having gas bladder simple (vs. with posterior secondary chamber) and dorsal and caudal fins uniformly dusky (vs. with distinct marks composed of dark broad band or blotch on central portion of dorsal fin and pair of dark broad stripes on caudal fin, one central to each
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Annotated checklist of parasitic and decapod crustaceans from the middle and lower Xingu (Amazon Basin) above and below the Belo Monte dam complex, Pará State, Brazil Proc. Acad. Nat. Sci. Philadelphia (IF 1.0) Pub Date : 2018-05-01 Célio Magalhães; Rafael Robles; Edvanda A. Souza-Carvalho; Fabrício L. Carvalho; José Celso de Oliveira Malta; Fernando L. Mantelatto
Results are presented on species richness and distribution of the crustacean fauna obtained by iXingu Project expeditions along the middle and lower Xingu River during low and high water seasons primarily from 2013–2014, prior to the completion of the Belo Monte dam complex. The checklist includes the parasitic and decapod crustacean species surveyed in the Xingu River from the mouth of its tributary
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A new Hyphessobrycon (Characiformes: Characidae) from the rio Xingu Basin, Brazil Proc. Acad. Nat. Sci. Philadelphia (IF 1.0) Pub Date : 2018-04-01 Tiago C. Faria; Flávio C. T. Lima; Douglas A. Bastos
A new species of Hyphessobrycon is described from the middle and lower rio Xingu Basin, Pará state, Brazil. The new species can be distinguished from all congeners by the combination of a large caudal peduncle blotch (largest in mature males), absence of humeral blotch, and largest teeth on dentary, inner premaxillary and maxillary relatively compressed with 6–9 cusps. The new species is compared to
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Crenicichla dandara, new species: the black jacundá from the Rio Xingu (Teleostei: Cichlidae) Proc. Acad. Nat. Sci. Philadelphia (IF 1.0) Pub Date : 2018-04-01 Henrique R. Varella; Priscila Madoka M. Ito
Crenicichla dandara, new species, is endemic to the rio Xingu above the Belo Monte narrows, and its major left bank tributary the rio Iriri. The new species is distinguished from all congeners by the following combination of characters: body uniformly black (live fishes) or dark brown (preserved specimens) in adults and 74–86 scales in the E1 row. Crenicichla dandara is considered herein to be the
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Taxonomic assessment of the Hard-Nosed Thornycats (Siluriformes: Doradidae: Trachydoras Eigenmann 1925) with description of Trachydoras gepharti, n. sp. Proc. Acad. Nat. Sci. Philadelphia (IF 1.0) Pub Date : 2017-08-01 Mark Henry Sabaj; Mariangeles Arce Hernández
Trachydoras is a genus of Doradidae (thorny catfishes) with five nominal valid species distributed in lowland areas of the Amazon, Orinoco, Paraná-Paraguay and Essequibo river basins of South America. A sixth species is described here as Trachydoras gepharti and diagnosed by five characteristics unique among congeners: mental barbels thick, tapered and profusely ornamented with many elongate fleshy
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Drulia cristinae, new species of sponge from the rio Xingu, Amazonas Basin, Brazil (Porifera: Demospongiae: Poecilosclerida: Metaniidae Volkmer-Ribeiro, 1986) Proc. Acad. Nat. Sci. Philadelphia (IF 1.0) Pub Date : 2017-07-01 Cecília Volkmer-Ribeiro; Inés Ezcurra de Drago; Vanessa de Souza Machado; Mark Henry Sabaj
A recent survey of the aquatic fauna in the rio Xingu, Pará State, Brazil, revealed a new species of Drulia Gray 1867, an extraordinary genus of freshwater sponge endemic to South America. Drulia cristinae n. sp. is distinguished in part by having gemmoscleres typically with elliptical outline and outer face with small, central crest or irregular bulge (exceptionally nude), oscules set atop conical