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Iracilda Sampaio - One of the best experts on this subject based on the ideXlab platform.
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Molecular data highlight hybridization in squirrel monkeys (Saimiri, Cebidae)
Genetics and Molecular Biology, 2016Co-Authors: Jeferson Carneiro, Horacio Schneider, Luis Fernando Da Silva Rodrigues-filho, Iracilda SampaioAbstract:Hybridization has been reported increasingly frequently in recent years, fueling the debate on its role in the evolutionary history of species. Some studies have shown that hybridization is very common in captive New World primates, and hybrid offspring have phenotypes and physiological responses distinct from those of the "pure" parents, due to gene introgression. Here we used the TA15 Alu insertion to investigate hybridization in the genus Saimiri. Our results indicate the hybridization of Saimiri boliviensis peruviensis with S. sciureus Macrodon, and S. b. boliviensis with S. ustus. Unexpectedly, some hybrids of both S. boliviensis peruviensis and S. b. boliviensis were homozygous for the absence of the insertion, which indicates that the hybrids were fertile.
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Molecular phylogeny of the western South Atlantic Sciaenidae based on mitochondrial and nuclear data.
Molecular Phylogenetics and Evolution, 2012Co-Authors: Simoni Santos, Iracilda Sampaio, Maria Gomes, Anna Rafaella Dos Santos Ferreira, Horacio SchneiderAbstract:Fragments of mitochondrial (COI and rRNA 16S) and nuclear (Tmo-4C4) genes were sequenced to evaluate the phylogenetic relationships among 15 genera of the western South Atlantic Sciaenidae, two freshwater genera and the northwest Pacific Larimichthys crocea. Our results suggest a great diversification for the western Atlantic assemblage; the monophyly of Macrodon, Menticirrhus and Plagioscion genera; the distinctiveness of Bardiella, Stellifer and Ophioscion as belonging to the same clade; the possible existence of two distinct groups in Stellifer; the closer relationship between Lonchurus and Paralonchurus; the non-monophyly of Cynoscion; and the remarkable diversification of Larimus breviceps populations in the Brazilian coast. This is the most comprehensive study evaluating the phylogenetic relationships of the western Atlantic sciaenid and provides a guide for future studies within this family.
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Macrodon atricauda gunther 1880 perciformes sciaenidae a valid species from the southwestern atlantic with comments on its conservation
Zootaxa, 2010Co-Authors: Alfredo Carvalhofilho, Simoni Santos, Iracilda SampaioAbstract:The American sciaenid genus Macrodon presently consists of only two species, the Atlantic Macrodon ancylodon (Bloch & Schneider, 1801), and the Pacific Macrodon mordax (Gilbert & Starks, 1904). The two species are distinguished mainly by the number of pored scales on the lateral line (66–78 in M. ancylodon vs. 45–55 in M. mordax). The present study revalidates a third species, the second from the Atlantic, Macrodon atricauda (Gunther, 1880), which is genetically, morphologically, and geographically distinct from M. ancylodon, occurring between the Brazilian state of Espirito Santo and northern Argentina. It has significant economic importance in the area and thus considerations about its conservation are also presented.
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molecular phylogenetic and population genetic structuring of Macrodon sp a coastal and estuarine fish of the western atlantic ocean
2010Co-Authors: Iracilda Sampaio, Simoni Santos, Horacio SchneiderAbstract:The study on fish fauna of the Caete estuary led to a large-scale phylogenetic analysis of one of its common fish species, Macrodon ancylodon. Phylogeographic patterns in M. ancylodon sampled from 16 locations in the subtropical and tropical western Atlantic Ocean were investigated using mitochondrial DNA 16S rRNA and cytochrome b sequences. The analysis shows two monophyletic and highly differentiated lineages of Macrodon populations in the western Atlantic Ocean, and there was no zone of overlap between the two groups, which were geographically separated in the region of South Bahia (Porto Seguro) and north Espirito Santo (Vitoria). Tropical and subtropical groups of Macrodon show nucleotide divergences for the 16S gene varying from 2.4 to 3.5%, a magnitude of genetic divergences usually observed between distinct species of Sciaenidae. The high values of divergence observed between the two groups, coupled with the clearly geographic isolation between them, strongly support our conclusions that these groups should be considered distinct species, M. ancylodon (Bloch and Schneider 1801) being the species of the tropical region (Venezuela to Bahia) and Macrodon sp. the new species of the subtropical region (Espirito Santo to Argentina). Curiously, assuming a constant rate of 1% of divergence per million years for the 16S rRNA, estimation obtained by the comparison of Panama trans-isthmian geminate species of Centropomus, we estimate that the separation between the tropical and subtropical groups of Macrodon have possibly occurred between 2.4 and 3.5 million years ago, during the late Pliocene. These genetic evidences strongly indicate a taxonomic revision of this estuarine-dependent group of fishes.
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population genetic structuring of the king weakfish Macrodon ancylodon sciaenidae in atlantic coastal waters of south america deep genetic divergence without morphological change
Molecular Ecology, 2006Co-Authors: Simoni Santos, Horacio Schneider, Tomas Hrbek, Izeni Pires Farias, Iracilda SampaioAbstract:: Phylogeographic patterns in Macrodon ancylodon sampled from 12 locations across all its range were investigated using mitochondrial DNA cytochrome b sequences, and analysed together with patterns of morphometric differentiation. Populations of the North Brazil and the Brazil currents, with warmer waters, form a clade (tropical clade) separated by 23 fixed mutations from the populations that inhabit regions of colder waters influenced by the Brazil and Malvinas currents (subtropical clade). No gene flow exists between the tropical and subtropical clades, and most likely also between the two groups of the tropical clade. Distribution of these clades and groups is correlated with flow of currents and their temperatures, and is facilitated by larval retention and low adult migration. Despite differentiation at the molecular level, fishes analysed from all these current-influenced regions are morphometrically homogeneous. Throughout its range M. ancylodon inhabits the same, or very similar niche; thus, stabilizing selection probably promotes the retention of highly conserved morphology despite deep genetic divergence at the mitochondrial DNA cytochrome b.
Simoni Santos - One of the best experts on this subject based on the ideXlab platform.
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Molecular phylogeny of the western South Atlantic Sciaenidae based on mitochondrial and nuclear data.
Molecular Phylogenetics and Evolution, 2012Co-Authors: Simoni Santos, Iracilda Sampaio, Maria Gomes, Anna Rafaella Dos Santos Ferreira, Horacio SchneiderAbstract:Fragments of mitochondrial (COI and rRNA 16S) and nuclear (Tmo-4C4) genes were sequenced to evaluate the phylogenetic relationships among 15 genera of the western South Atlantic Sciaenidae, two freshwater genera and the northwest Pacific Larimichthys crocea. Our results suggest a great diversification for the western Atlantic assemblage; the monophyly of Macrodon, Menticirrhus and Plagioscion genera; the distinctiveness of Bardiella, Stellifer and Ophioscion as belonging to the same clade; the possible existence of two distinct groups in Stellifer; the closer relationship between Lonchurus and Paralonchurus; the non-monophyly of Cynoscion; and the remarkable diversification of Larimus breviceps populations in the Brazilian coast. This is the most comprehensive study evaluating the phylogenetic relationships of the western Atlantic sciaenid and provides a guide for future studies within this family.
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differences in the otoliths support the distinction of the genus Macrodon into two species in the south western atlantic ocean
Marine Biodiversity Records, 2012Co-Authors: Luis Cardoso, Simoni Santos, Manuel HaimoviciAbstract:Luis Gustavo Cardoso, Simoni Santos and Manuel Haimovici Marine Biodiversity Records / Volume 5 / September 2012 / e93 DOI: 10.1017/S1755267212000802, Published online: Link to this article: http://journals.cambridge.org/abstract_S1755267212000802 How to cite this article: Luis Gustavo Cardoso, Simoni Santos and Manuel Haimovici (2012). Differences in the otoliths support the distinction of the genus Macrodon into two species in the southwestern Atlantic Ocean. Marine Biodiversity Records, 5, e93 doi:10.1017/ S1755267212000802 Request Permissions : Click here
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Macrodon atricauda gunther 1880 perciformes sciaenidae a valid species from the southwestern atlantic with comments on its conservation
Zootaxa, 2010Co-Authors: Alfredo Carvalhofilho, Simoni Santos, Iracilda SampaioAbstract:The American sciaenid genus Macrodon presently consists of only two species, the Atlantic Macrodon ancylodon (Bloch & Schneider, 1801), and the Pacific Macrodon mordax (Gilbert & Starks, 1904). The two species are distinguished mainly by the number of pored scales on the lateral line (66–78 in M. ancylodon vs. 45–55 in M. mordax). The present study revalidates a third species, the second from the Atlantic, Macrodon atricauda (Gunther, 1880), which is genetically, morphologically, and geographically distinct from M. ancylodon, occurring between the Brazilian state of Espirito Santo and northern Argentina. It has significant economic importance in the area and thus considerations about its conservation are also presented.
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molecular phylogenetic and population genetic structuring of Macrodon sp a coastal and estuarine fish of the western atlantic ocean
2010Co-Authors: Iracilda Sampaio, Simoni Santos, Horacio SchneiderAbstract:The study on fish fauna of the Caete estuary led to a large-scale phylogenetic analysis of one of its common fish species, Macrodon ancylodon. Phylogeographic patterns in M. ancylodon sampled from 16 locations in the subtropical and tropical western Atlantic Ocean were investigated using mitochondrial DNA 16S rRNA and cytochrome b sequences. The analysis shows two monophyletic and highly differentiated lineages of Macrodon populations in the western Atlantic Ocean, and there was no zone of overlap between the two groups, which were geographically separated in the region of South Bahia (Porto Seguro) and north Espirito Santo (Vitoria). Tropical and subtropical groups of Macrodon show nucleotide divergences for the 16S gene varying from 2.4 to 3.5%, a magnitude of genetic divergences usually observed between distinct species of Sciaenidae. The high values of divergence observed between the two groups, coupled with the clearly geographic isolation between them, strongly support our conclusions that these groups should be considered distinct species, M. ancylodon (Bloch and Schneider 1801) being the species of the tropical region (Venezuela to Bahia) and Macrodon sp. the new species of the subtropical region (Espirito Santo to Argentina). Curiously, assuming a constant rate of 1% of divergence per million years for the 16S rRNA, estimation obtained by the comparison of Panama trans-isthmian geminate species of Centropomus, we estimate that the separation between the tropical and subtropical groups of Macrodon have possibly occurred between 2.4 and 3.5 million years ago, during the late Pliocene. These genetic evidences strongly indicate a taxonomic revision of this estuarine-dependent group of fishes.
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population genetic structuring of the king weakfish Macrodon ancylodon sciaenidae in atlantic coastal waters of south america deep genetic divergence without morphological change
Molecular Ecology, 2006Co-Authors: Simoni Santos, Horacio Schneider, Tomas Hrbek, Izeni Pires Farias, Iracilda SampaioAbstract:: Phylogeographic patterns in Macrodon ancylodon sampled from 12 locations across all its range were investigated using mitochondrial DNA cytochrome b sequences, and analysed together with patterns of morphometric differentiation. Populations of the North Brazil and the Brazil currents, with warmer waters, form a clade (tropical clade) separated by 23 fixed mutations from the populations that inhabit regions of colder waters influenced by the Brazil and Malvinas currents (subtropical clade). No gene flow exists between the tropical and subtropical clades, and most likely also between the two groups of the tropical clade. Distribution of these clades and groups is correlated with flow of currents and their temperatures, and is facilitated by larval retention and low adult migration. Despite differentiation at the molecular level, fishes analysed from all these current-influenced regions are morphometrically homogeneous. Throughout its range M. ancylodon inhabits the same, or very similar niche; thus, stabilizing selection probably promotes the retention of highly conserved morphology despite deep genetic divergence at the mitochondrial DNA cytochrome b.
Horacio Schneider - One of the best experts on this subject based on the ideXlab platform.
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Molecular data highlight hybridization in squirrel monkeys (Saimiri, Cebidae)
Genetics and Molecular Biology, 2016Co-Authors: Jeferson Carneiro, Horacio Schneider, Luis Fernando Da Silva Rodrigues-filho, Iracilda SampaioAbstract:Hybridization has been reported increasingly frequently in recent years, fueling the debate on its role in the evolutionary history of species. Some studies have shown that hybridization is very common in captive New World primates, and hybrid offspring have phenotypes and physiological responses distinct from those of the "pure" parents, due to gene introgression. Here we used the TA15 Alu insertion to investigate hybridization in the genus Saimiri. Our results indicate the hybridization of Saimiri boliviensis peruviensis with S. sciureus Macrodon, and S. b. boliviensis with S. ustus. Unexpectedly, some hybrids of both S. boliviensis peruviensis and S. b. boliviensis were homozygous for the absence of the insertion, which indicates that the hybrids were fertile.
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Molecular phylogeny of the western South Atlantic Sciaenidae based on mitochondrial and nuclear data.
Molecular Phylogenetics and Evolution, 2012Co-Authors: Simoni Santos, Iracilda Sampaio, Maria Gomes, Anna Rafaella Dos Santos Ferreira, Horacio SchneiderAbstract:Fragments of mitochondrial (COI and rRNA 16S) and nuclear (Tmo-4C4) genes were sequenced to evaluate the phylogenetic relationships among 15 genera of the western South Atlantic Sciaenidae, two freshwater genera and the northwest Pacific Larimichthys crocea. Our results suggest a great diversification for the western Atlantic assemblage; the monophyly of Macrodon, Menticirrhus and Plagioscion genera; the distinctiveness of Bardiella, Stellifer and Ophioscion as belonging to the same clade; the possible existence of two distinct groups in Stellifer; the closer relationship between Lonchurus and Paralonchurus; the non-monophyly of Cynoscion; and the remarkable diversification of Larimus breviceps populations in the Brazilian coast. This is the most comprehensive study evaluating the phylogenetic relationships of the western Atlantic sciaenid and provides a guide for future studies within this family.
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molecular phylogenetic and population genetic structuring of Macrodon sp a coastal and estuarine fish of the western atlantic ocean
2010Co-Authors: Iracilda Sampaio, Simoni Santos, Horacio SchneiderAbstract:The study on fish fauna of the Caete estuary led to a large-scale phylogenetic analysis of one of its common fish species, Macrodon ancylodon. Phylogeographic patterns in M. ancylodon sampled from 16 locations in the subtropical and tropical western Atlantic Ocean were investigated using mitochondrial DNA 16S rRNA and cytochrome b sequences. The analysis shows two monophyletic and highly differentiated lineages of Macrodon populations in the western Atlantic Ocean, and there was no zone of overlap between the two groups, which were geographically separated in the region of South Bahia (Porto Seguro) and north Espirito Santo (Vitoria). Tropical and subtropical groups of Macrodon show nucleotide divergences for the 16S gene varying from 2.4 to 3.5%, a magnitude of genetic divergences usually observed between distinct species of Sciaenidae. The high values of divergence observed between the two groups, coupled with the clearly geographic isolation between them, strongly support our conclusions that these groups should be considered distinct species, M. ancylodon (Bloch and Schneider 1801) being the species of the tropical region (Venezuela to Bahia) and Macrodon sp. the new species of the subtropical region (Espirito Santo to Argentina). Curiously, assuming a constant rate of 1% of divergence per million years for the 16S rRNA, estimation obtained by the comparison of Panama trans-isthmian geminate species of Centropomus, we estimate that the separation between the tropical and subtropical groups of Macrodon have possibly occurred between 2.4 and 3.5 million years ago, during the late Pliocene. These genetic evidences strongly indicate a taxonomic revision of this estuarine-dependent group of fishes.
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population genetic structuring of the king weakfish Macrodon ancylodon sciaenidae in atlantic coastal waters of south america deep genetic divergence without morphological change
Molecular Ecology, 2006Co-Authors: Simoni Santos, Horacio Schneider, Tomas Hrbek, Izeni Pires Farias, Iracilda SampaioAbstract:: Phylogeographic patterns in Macrodon ancylodon sampled from 12 locations across all its range were investigated using mitochondrial DNA cytochrome b sequences, and analysed together with patterns of morphometric differentiation. Populations of the North Brazil and the Brazil currents, with warmer waters, form a clade (tropical clade) separated by 23 fixed mutations from the populations that inhabit regions of colder waters influenced by the Brazil and Malvinas currents (subtropical clade). No gene flow exists between the tropical and subtropical clades, and most likely also between the two groups of the tropical clade. Distribution of these clades and groups is correlated with flow of currents and their temperatures, and is facilitated by larval retention and low adult migration. Despite differentiation at the molecular level, fishes analysed from all these current-influenced regions are morphometrically homogeneous. Throughout its range M. ancylodon inhabits the same, or very similar niche; thus, stabilizing selection probably promotes the retention of highly conserved morphology despite deep genetic divergence at the mitochondrial DNA cytochrome b.
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genetic differentiation of Macrodon ancylodon sciaenidae perciformes populations in atlantic coastal waters of south america as revealed by mtdna analysis
Genetics and Molecular Biology, 2003Co-Authors: Simoni Santos, Horacio Schneider, Iracilda SampaioAbstract:The king weakfish (pescada-go in Portuguese - Macrodon ancylodon (Sciaenidae), a demersal (bottom-feeding) species found in South America Atlantic coastal waters from the Gulf of Paria in Venezuela to Baia Blanca in Argentina, is an economically important species because of its abundance and wide acceptance by consumers. Because of its wide distribution this fish may be subject to geographic isolation and this may have resulted in distinct populations along its coastal range. Considering that this species represents an important economic resource, confirmation of whether M. ancylodon is a single species or there are different genetic stocks spread over its wide distribution would be an important contribution to conservation policies and population management of the king weakfish. To investigate differences between king weakfish populations we used the cytochrome b and 16S rRNA genes to characterize M. ancylodon specimens caught throughout its South American range from Venezuela to Argentina. Our results clearly distinguished two genetically different groups which show nucleotide divergence and genetic structuring patterns that strongly suggest they may be different species, disagreeing with the widely accepted traditional taxonomy that accepts only one species of Macrodon in the western Atlantic.
Germano Soares - One of the best experts on this subject based on the ideXlab platform.
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surimi of king weakfish Macrodon ancylodon wastes texture gel evaluation with protease inhibitors and transglutaminase
Brazilian Archives of Biology and Technology, 2004Co-Authors: Claudio Rafael Kuhn, Carlos Prenticehernandez, Joao Luis Vendruscolo, Germano SoaresAbstract:The protease inhibitors (bovine serum albumin -BSA - and egg white) and transglutaminase inhibitor (NH4Cl), was added to the surimi obtained by King weakfish (Macrodon ancylodon) wastes to evaluate your effect on the gel texture. Results indicated that the treatment with pre-heating (60°C, 30min + 90°C, 15min) favored the elasticity of the gel (ashi), demonstrating low proteolysis and characterizing the suwari phenomenon (high gel strength). Protease inhibitors increased gel strength significantly (P<0.05) by compression force, when BSA was better than egg whites. Gels from surimi of King weakfish wastes didn't have action of the transglutaminase characterized.
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Surimi of king weakfish (Macrodon ancylodon) wastes: texture gel evaluation with protease inhibitors and transglutaminase
Brazilian Archives of Biology and Technology, 2004Co-Authors: Claudio Rafael Kuhn, Joao Luis Vendruscolo, Carlos Prentice-hernández, Germano SoaresAbstract:The protease inhibitors (bovine serum albumin -BSA - and egg white) and transglutaminase inhibitor (NH4Cl), was added to the surimi obtained by King weakfish (Macrodon ancylodon) wastes to evaluate your effect on the gel texture. Results indicated that the treatment with pre-heating (60°C, 30min + 90°C, 15min) favored the elasticity of the gel (ashi), demonstrating low proteolysis and characterizing the suwari phenomenon (high gel strength). Protease inhibitors increased gel strength significantly (P
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avaliacao da forca de gel de surimi de residuos de pescada foguete Macrodon ancylodon enriquecido com aditivos proteicos
Boletim Do Centro De Pesquisa De Processamento De Alimentos, 2003Co-Authors: Claudio Rafael Kuhn, Germano Soares, Carlos Prenticehernandez, Joao Luis VendruscoloAbstract:Aditivos proteicos (albumina de soro bovino e clara de ovo) foram adicionados ao surimi de residuos do processamento de pescada-foguete ( Macrodon ancylodon) para proteger a rede proteica miofibrilar e aumentar a forca do gel kamaboko, formado durante o processamento termico do surimi. Tambem adicionouse cloreto de amonio (NH4Cl) para inibir a transglutaminase, enzima cuja presenca aumenta a textura devido melhor conformacao das proteinas no pre-aquecimento. A analise instrumental em testes de compressao revelou que o surimi contendo aditivos alcancou maior forca de gel em relacao ao controle, sendo a albumina do soro bovino melhor do que a clara de ovo (P GEL STRENGTH EVALUATION OF SURIMI FROM BRAZILIAN WEAKFISH (Macrodon ancylodon) WASTES ENRICHED WITH PROTEIN ADDITIVES Abstract The protein additives bovine serum albumin (BSA) and egg white were added to surimi processed from Brazilian weakfish ( Macrodon ancylodon) wastes to protect the myofibril protein and to increase the gel strength of kamaboko gels formed during the heating process of surumi. The ammonium chloride was also added (NH4Cl) as a transglutaminase inhibitor to identify the presence of the enzyme, which enhances the texture due to better protein configuration in pre-heating. The instrumental analysis by compression tests revealed that the surimi content additives reached larger gel strength than the control, with BSA being better than the egg white (P
Victoria J. Isaac - One of the best experts on this subject based on the ideXlab platform.
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food categories reconstruction and feeding consumption estimates for the sciaenid Macrodon ancylodon bloch schneider and the congeneric fishes stellifer rastrifer jordan and stellifer naso jordan pisces perciformes in the caete estuary northern coast
Revista Brasileira De Zoologia, 2004Co-Authors: Mauricio Camargo, Victoria J. IsaacAbstract:Um metodo quantitativo para se estimar o consumo alimentar e o aporte energetico das diferentes categorias alimentares e apresentado atraves da reconstrucao das presas ingeridas com base em estruturas corporais nao digeriveis. Para tal, o presente estudo estabelece, atraves do exame dos conteudos estomacais de 1.086 exemplares dissecados de Macrodon ancylodon (Bloch & Schneider, 1801), Stellifer rastrifer (Jordan, 1889) e Stellifer naso (Jordan, 1889), as equacoes das relacoes funcionais entre o peso das presas e estruturas corporais. Com as categorias reconstruidas foi possivel quantificar o alimento ingerido pelos especimes. Os resultados indicaram que existe uma marcada diferenca, tanto na composicao das categorias alimentares, bem como no aporte energetico acompanhando o desenvolvimento ontogenico do predador.
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Food categories reconstruction and feeding consumption estimates for the Sciaenid Macrodon ancylodon (Bloch & Schneider), and the congeneric fishes Stellifer rastrifer (Jordan) and Stellifer naso (Jordan) (Pisces, Perciformes) in the Caeté Estuary, N
Revista Brasileira De Zoologia, 2004Co-Authors: Mauricio Camargo, Victoria J. IsaacAbstract:Um metodo quantitativo para se estimar o consumo alimentar e o aporte energetico das diferentes categorias alimentares e apresentado atraves da reconstrucao das presas ingeridas com base em estruturas corporais nao digeriveis. Para tal, o presente estudo estabelece, atraves do exame dos conteudos estomacais de 1.086 exemplares dissecados de Macrodon ancylodon (Bloch & Schneider, 1801), Stellifer rastrifer (Jordan, 1889) e Stellifer naso (Jordan, 1889), as equacoes das relacoes funcionais entre o peso das presas e estruturas corporais. Com as categorias reconstruidas foi possivel quantificar o alimento ingerido pelos especimes. Os resultados indicaram que existe uma marcada diferenca, tanto na composicao das categorias alimentares, bem como no aporte energetico acompanhando o desenvolvimento ontogenico do predador.
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Population structure of fish fauna in the estuarine area of Caeté Population structure of fish fauna in the estuarine area of Caeté Population structure of fish fauna in the estuarine area of Caeté
1998Co-Authors: Mauricio Camargo, Victoria J. IsaacAbstract:This study describes the relative size and age structure of the sciaenids Macrodon ancylodon , Stellifer rastrifer and Stellifer naso , the ariid Cathorops spixii and the aspredinid Aspredo aspredo in the estuary of the Caete River. Four bimonthly samples were collected with trawl and gill nets during August, October and December 1996 and February 1997 in three different areas: (A) main river channel, (B) bay, and (C) coastal areas. Total length and weight of 16,298 individuals of all these species were recorded. Monthly frequency distributions were plotted. Cohorts were identified by dividing the distribution into separate normal distributions; asymptotic length (L ∞) and K were estimated for these stocks by FISAT program. Biomass averages (g/m 2 ) were estimated using the swept area method. Average biomass of Macrodon ancylodon was 0.29g/m 2 , total length ranged from 3cm to 41cm; length frequencies identified five cohorts; L ∞ = 45.50cm and K = 0.491 year -1 . For Stellifer rastrifer, average biomass was 0.31 g/m 2 ; total lengths ranged from 1 to 17cm; L ∞ = 22.5cm and K = 0.31 year -1 . For Stellifer naso , average biomass was 0.03 g/m 2 ; L ∞ = 26.3cm and K = 0.321 year -1 , total lengths ranged from 2 to 25cm. For Cathorops spixii, average biomass was 0.55 g/m 2 ; L ∞ = 33.3cm and K = 0,36 year -1 ; density was much higher in the river habitats. Aspredo aspredo presented a biomass of 0.06 g/m 2 ; abundance was higher in the river; total lengths ranged from 2 to 36cm; L ∞ = 42.5cm and K = 0.35 year -1 . Despite the different biological strategies of each species with respect to spatial distribution and relative abundance, they all utilize the estuarine habitat as nursery grounds in the early phases of their life cycles.
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Population structure of fish fauna in the estuarine area of Caeté River, Bragança, Pará, Brazil
Acta Scientiarum. Biological Sciences, 1998Co-Authors: Maurício Camargo-zorro, Victoria J. IsaacAbstract:Este estudo descreve o tamanho relativo e a estrutura etária dos peixes cienídeos Macrodon ancylodon, Stellifer rastrifer e Stellifer naso, o ariídeo Cathorops spixii e o aspredinídeo Aspredo aspredo para o estuário do rio Caeté. Quatro amostragens bimensais foram feitas com malhadeira e rede de arrasto de fundo, durante os meses de agosto, outubro e dezembro de 1996, e fevereiro de 1997, em três áreas diferentes: (A) canal principal do rio, (B) baía, e (C) área costeira. O comprimento total e o peso de 16.298 exemplares dessas espécies foram avaliados. Distribuições de freqüência mensais foram plotados. As coortes foram identificadas ao dividir as distribuições de freqüência em distribuições normais isoladas. O comprimento assintótico (L∞) e K foi estimado para esses estoques, com o uso do programa FISAT. A biomassa média (g/m2) por espécie foi estimada utilizando-se o método de área varrida. A biomassa média de Macrodon ancylodon foi 0,29g/m2; seu comprimento total variou de 3-41cm; as distribuições de freqüência permitiram identificar cinco coortes; L∞ = 45,50cm e K = 0,491 ano-1. Stellifer rastrifer apresentou uma biomassa média de 0,31g/m2 e seus comprimentos totais variaram de 1-17cm, L∞ = 22,5cm e K = 0,31 ano-1. Stellifer naso teve biomassa média de 0,03g/m2, L∞ = 26,3cm e K = 0,321 ano-1; seu comprimento total variou de 2 a 25cm. Cathorops spixii apresentou biomassa média 0,55g/m2, estimativas de L∞ = 33,3cm e K = 0,36 ano-1; sua densidade foi a mais alta dentro dos habitats do rio. Aspredo aspredo apresentou biomassa de 0,06g/m,2 maior abundância dentro do rio; comprimento total de 2 a 36cm; L∞ = 42,5cm e K = 0,35ano-1. Ainda que cada uma dessas espécies apresenta diferentes estratégias biológicas quanto à distribuição espacial e à abundância relativa, verificou-se que todas utilizam os habitats estuarinos como áreas de criadouro, nas primeiras fases de seu ciclo de vida.This study describes the relative size and age structure of the sciaenids Macrodon ancylodon, Stellifer rastrifer and Stellifer naso, the ariid Cathorops spixii and the aspredinid Aspredo aspredo in the estuary of the Caeté River. Four bimonthly samples were collected with trawl and gill nets during August, October and December 1996 and February 1997 in three different areas: (A) main river channel, (B) bay, and (C) coastal areas. Total length and weight of 16,298 individuals of all these species were recorded. Monthly frequency distributions were plotted. Cohorts were identified by dividing the distribution into separate normal distributions; asymptotic length (L∞) and K were estimated for these stocks by FISAT program. Biomass averages (g/m2) were estimated using the swept area method. Average biomass of Macrodon ancylodon was 0.29g/m2, total length ranged from 3cm to 41cm; length frequencies identified five cohorts; L∞ = 45.50cm and K = 0.491 year-1. For Stellifer rastrifer, average biomass was 0.31 g/m2; total lengths ranged from 1 to 17cm; L∞ = 22.5cm and K = 0.31 year-1. For Stellifer naso, average biomass was 0.03 g/m2 ; L∞ = 26.3cm and K = 0.321 year-1, total lengths ranged from 2 to 25cm. For Cathorops spixii, average biomass was 0.55 g/m2; L∞ = 33.3cm and K = 0,36 year-1; density was much higher in the river habitats. Aspredo aspredo presented a biomass of 0.06 g/m2; abundance was higher in the river; total lengths ranged from 2 to 36cm; L∞ = 42.5cm and K = 0.35 year-1. Despite the different biological strategies of each species with respect to spatial distribution and relative abundance, they all utilize the estuarine habitat as nursery grounds in the early phases of their life cycles
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Population structure of fish fauna in the estuarine area of Caeté River, Bragança, Pará, Brazil - DOI: 10.4025/actascibiolsci.v20i0.4469
Acta Scientiarum. Biological Sciences, 1998Co-Authors: Maurício Camargo-zorro, Victoria J. IsaacAbstract:This study describes the relative size and age structure of the sciaenids Macrodon ancylodon, Stellifer rastrifer and Stellifer naso , the ariid Cathorops spixii and the aspredinid Aspredo aspredo in the estuary of the Caete River. Four bimonthly samples were collected with trawl and gill nets during August, October and December 1996 and February 1997 in three different areas: (A) main river channel, (B) bay, and (C) coastal areas. Total length and weight of 16,298 individuals of all these species were recorded. Monthly frequency distributions were plotted. Cohorts were identified by dividing the distribution into separate normal distributions; asymptotic length (L ∞ ) and K were estimated for these stocks by FISAT program. Biomass averages (g/m 2 ) were estimated using the swept area method. Average biomass of Macrodon ancylodon was 0.29g/m 2 , total length ranged from 3cm to 41cm; length frequencies identified five cohorts; L ∞ = 45.50cm and K = 0.491 year -1 . For Stellifer rastrifer , average biomass was 0.31 g/m 2 ; total lengths ranged from 1 to 17cm; L ∞ = 22.5cm and K = 0.31 year -1 . For Stellifer naso , average biomass was 0.03 g/m 2 ; L ∞ = 26.3cm and K = 0.321 year -1 , total lengths ranged from 2 to 25cm. For Cathorops spixii , average biomass was 0.55 g/m 2 ; L ∞ = 33.3cm and K = 0,36 year -1 ; density was much higher in the river habitats. Aspredo aspredo presented a biomass of 0.06 g/m 2 ; abundance was higher in the river; total lengths ranged from 2 to 36cm; L ∞ = 42.5cm and K = 0.35 year -1 . Despite the different biological strategies of each species with respect to spatial distribution and relative abundance, they all utilize the estuarine habitat as nursery grounds in the early phases of their life cycles.
