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| Medeiros,Paulo R.; Rosa,Ricardo S.; Francini-Filho,Ronaldo B.. |
| In recent years, many studies investigated how density-dependent factors, such as shortages in microhabitat and food availability influence the structure of reef fish assemblages. Most of what is currently known, however, comes from comparisons of isolated patch reefs and from correlations between fish abundance and one or few microhabitat variables. In addition, most studies were done in the Caribbean and Indo-Pacific regions, whereas the South Atlantic region has been, to date, understudied. The present study evaluated spatial and temporal variations in reef fish abundance and species richness in a continuous rocky reef and adjacent unconsolidated habitats in a Southwestern Atlantic reef, using underwater techniques to assess both fish numbers and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Complexity; Distribution; Reef fishes; Reef habitats; Sandy habitats. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252011000400018 |
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| Xavier,Josias Henrique de Amorim; Cordeiro,Cesar Augusto Marcelino Mendes; Tenório,Gabrielle Dantas; Diniz,Aline de Farias; Paulo Júnior,Eugenio Pacelli Nunes; Rosa,Ricardo S.; Rosa,Ierecê Lucena. |
| Reefs, mangroves and seagrass biotopes often occur in close association, forming a complex and highly productive ecosystem that provide significant ecologic and economic goods and services. Different anthropogenic disturbances are increasingly affecting these tropical coastal habitats leading to growing conservation concern. In this field-based study, we used a visual census technique (belt transects 50 m x 2 m) to investigate the interactions between fishes and microhabitats at the Mamanguape Mangrove-Reef system, NE Brazil. Overall, 144 belt transects were performed from October 2007 to September 2008 to assess the structure of the fish assemblage. Fish trophic groups and life stage (juveniles and adults) were recorded according to literature, the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Conservation; Conservation unit; Ichthyofauna; Nursery habitats. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252012000100011 |
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| Silva,Márcio J.; Ramos,Telton P. A.; Carvalho,Fernando R.; Brito,Marcelo F. G.; Ramos,Robson T. C.; Rosa,Ricardo S.; Sánchez-Botero,Jorge I.; Novaes,José L. C.; Costa,Rodrigo S.; Lima,Sergio M. Q.. |
| Abstract Among Neotropical freshwater ecoregions, the Mid-Northeastern Caatinga (MNCE) is a fish knowledge gap. Its temporary drainages are receptors of the São Francisco interbasin water transfer project (SFR-IWT) in the Brazilian semiarid. We provide a comprehensive baseline of fish richness of the five SFR-IWT basins. Species richness, shared, endemic, threatened and non-native species were obtained using sampling, ichthyologic collections, literature and online repositories (306 localities). In total 121, species were recorded, 111 of them native, and 16 (14.41%) listed for all basins. Higher richness of native species (78, 70.27%) was recorded in the São Francisco lower-middle stretch (SFRE), including 23 endemic, 61 (54.95%) in MNCE basins (13... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Anthropogenic impacts; Biological invasions; Caatinga’s fishes; Mid-Northeastern Caatinga Ecoregion; Temporary rivers. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252020000400203 |
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| Rosa,Ricardo S.. |
| The monotypic genus Elipesurus of neotropical freshwater stingrays, and its type species E. spinicauda, are known from a single specimen which lacked a developed tail and caudal sting. No type or similar specimens exist. The original description and illustration are inaccurate, without diagnostic measurements or characters, excepting those mentioned above. Therefore, a precise identification of E. spinicauda remains impòssible, and both names are considered doubtful. Since all other potamotrygonid stingrays have more or less developed tails and stings, the Elipesurus condition is regarded as a mutilation. |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1985 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751985000100003 |
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| Rosa,Ricardo S.. |
| A review of the original descriptions and available types of the South American freshwater stingrays Trygon aiereba Müller & Henle, 1841, Trygon strogylopterus Schomburgk, 1843 and Disceus thayeri Garman, 1913 indicates that these three nominal species are synonymous. The senior name, placed in the monotypic genus Paratrygon Duméril, 1865, established for Trygon aiereba, is available and valid. Based on its description, T. aiereba is a freshwater stingray. Therefore, this taxon is not the same as Raja ajereba Walbaum and Raja orbicularis Schneider, both names established for the marine "Aiereba" of Marcgrave, and which preferably should be treated as nomina dubia. Paratrygon does not replace Potamotrygon Garman, 1877 as the type genus, because the... |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1990 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751990000400001 |
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| Rocha,Luiz A.; Rosa,Ierecê L.; Rosa,Ricardo S.. |
| The coral reef is an ecossystem which evokes great interest, for its beaury, species diversity and fisheries potential. The coast of Paraíba State, northeast Brazil, possesses several natural reefs and shipwrecks which are inhabited by a rich fish fauna. In order to survey the reef fish fauna of Paraíba State, a total of 118 dives, utilizing SCUBA diving techniques, were carriedoutin 27samplingpoints (depths: 0,5-66m), from February/1995 to May/1996. Specimens were collected whenever underwater identification was precluded. A total of 157 known species belonging to 59 families were found. Four unidentified species, one dasyatid, one haemulid, one scarid, and one labrid were recorded. Haemulidae was the most representative family in number of individuais,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Brazil; Paraíba; Reef fishes. |
| Ano: 1998 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751998000200017 |
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| Rosa,Ricardo S.; Carvalho,Marcelo R. de; Wanderley,Cristiane de Almeida. |
| Potamotrygon boesemani, new species, is described from the Corantijn river drainage in Surinam. The species has a diagnostic dorsal color pattern formed by deep orange to red ocellated spots of irregular form, encircled by relatively broad black rings. Potamotrygon boesemani is distinguished from other ocellated congeners (P. motoro, P. henlei and P. leopoldi) by the more intensely colored ocelli, which are usually yellow in the latter species. From P. motoro it is also distinguished by the darker dorsal background coloration, by the broader black contour of the dorsal ocelli, and by the irregular form of the ocelli as compared to the more rounded shape in the latter species. From P. henlei and P. leopoldi, it is distinguished by the lack of ocelli on... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Northern South America; Taxonomy; Potamotrygon motoro; Potamotrygon henlei; Potamotrygon leopoldi; Potamotrygon ocellata. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252008000100001 |
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