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Darryl L. Felder - One of the best experts on this subject based on the ideXlab platform.
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Molecular phylogeny of the American Callinectes Stimpson, 1860 (Brachyura: Portunidae), based on two partial mitochondrial genes
Marine Biology, 2007Co-Authors: Rafael Robles, Fernando Alvarez, Christoph D. Schubart, Jesús E. Conde, Carlos Carmona-suárez, José L. Villalobos, Darryl L. FelderAbstract:The genus Callinectes encompasses 16 species of commercially important swimming crabs. Most (13) occur on the Pacific and Atlantic coasts of the Americas. We compare mtDNA regions corresponding to 964 basepairs of the large (16S) and small (12S) ribosomal subunits among American Callinectes in order to examine phylogenetic relationships. The status of Callinectes affinis Fausto-Filho and Callinectes maracaiboensis Taissoun is questioned, and C. maracaiboensis is concluded to be a junior synonym of Callinectes bocourti A. Milne-Edwards, from which it cannot be consistently distinguished. We find two major lineages, one of which includes C. affinis, C. bocourti , Callinectes rathbunae Contreras, Callinectes sapidus Rathbun, and Callinectes toxotes Ordway. A second lineage is comprised of Callinectes arcuatus Ordway, Callinectes bellicosus (Stimpson), Callinectes danae Smith, Callinectes exasperatus (Gerstaecker), Callinectes larvatus Ordway, Callinectes ornatus Ordway, and Callinectes similis Williams. Definition of these clades is supported by previously described morphological differences in the length of the gonopods and shared physioecological adaptations. A calibrated molecular clock is used to estimate divergence of the two lineages near 13 mybp. Our analyses suggest that C. ornatus is the closest relative of C. arcuatus , and that C. affinis is closest to C. bocourti .
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Lack of divergence between 16S mtDNA sequences of the swimming crabs Callinectes bocourti and C. maracaiboensis (Brachyura: Portunidae) from Venezuela*
2001Co-Authors: Christoph D. Schubart, Rafael Robles, Jesús E. Conde, Carlos A. Carmona-suárez, Darryl L. FelderAbstract:Swimming crabs of the genus Callinectes Stimpson, 1860 are widely dis tributed throughout the American tropics and subtropics, where many species are exploited commercially (Norse, 1977; Williams, 1984). Members of this genus play key trophic roles in coastal habitats that range from sandy-mud bottoms to seagrass meadows (Arnold, 1984; Orth and van Montfrans, 1987; Wilson et al., 1987; Lin, 1991). Of the nine species of Callinectes from the tropical western Atlantic, seven have been reported from western Venezuela (Rodriguez, 1980; Williams, 1984; Carmona-Suarez and Conde, 1996). However, knowledge of these Venezuelan populations remains inadequate, despite the importance of several species in both large-scale commercial harvests and artisanal fi sheries of coastal villages in the area (Oesterling and Petrocci, 1995; FerrerMontano, 1997; Conde and Rodriguez, 1999). Persistent diffi culty in identifying mixed samples of these species hampers understanding of their distribution, abundance, and population dynamics, Lack of divergence between 16S mtDNA sequences of the swimming crabs Callinectes bocourti and C. maracaiboensis (Brachyura: Portunidae) from Venezuela*
Sérgio Luiz De Siqueira Bueno - One of the best experts on this subject based on the ideXlab platform.
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INFESTATION BY OCTOLASMIS LOWEI (CIRRIPEDIA: POECILASMATIDAE) IN Callinectes DANAE AND Callinectes ORNATUS (DECAPODA: PORTUNIDAE) FROM SÃO SEBASTIÃO, BRAZIL
Journal of Crustacean Biology, 2002Co-Authors: Cynthia Santos, Sérgio Luiz De Siqueira BuenoAbstract:Abstract Two species of blue crabs were investigated with regard to infestation of the branchial chambers by the pedunculate cirriped Octolasmis lowei. In Callinectes danae, the frequency of infestation was 22.4%, and the mean intensity of infestation was 2.2 ± 0.2 (range: 1–8). Prevalence and mean intensity of infestation did not differ significantly between males and females of C. danae. Significant differences in prevalence were observed between juveniles and adults, between ovigerous and nonovigerous adult females, and among blue crabs in different molt stages. No correlation was observed between the prevalence of infestation by O. lowei and the carapace width of male or female blue crabs. In Callinectes ornatus, the prevalence of infestation by O. lowei was 12.1%, and the mean intensity observed was 4.0 ± 1.3 (range: 1–49). Prevalence of infestation did not differ significantly among crabs in different molt stages but differed between juveniles and adults and between male and female crabs. A positive...
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Prevalence and mean intensity of infestation by Carcinonemertes carcinophila imminuta (Nemertea: Carcinonemertidae) in the gills of Callinectes danae and Callinectes ornatus (Decapoda: Portunidae) from São Sebastião, Brazil
Hydrobiologia, 2001Co-Authors: Cynthia Santos, Sérgio Luiz De Siqueira BuenoAbstract:The nemerteans of the genus Carcinonemertes live in association with decapod crustaceans. Juveniles of Carcinonemertes carcinophila imminuta Humes, 1942 are found in the gills of their hosts. A total of 281 specimens (52 males and 229 females) of Callinectes danae Smith, 1869 and 373 (332 males and 41 females) of Callinectes ornatus Ordway, 1863 were inspected for the occurrence of Carcinonemertes carcinophila imminuta in their gills. The prevalence and mean intensity of infestation by these nemerteans with regard to sex, maturity, condition of adult female crabs (ovigerous or non ovigerous), size (carapace width) and molt stage of hosts were evaluated. A prevalence of infestation by Carcinonemertes carcinophila imminutaof 39.1% was found in the population of Callinectes danae; the mean intensity of infestation was 12.0±2.7, while intensity ranged from 1 to 268. In this host species, significant differences in prevalence were observed between males and females, juveniles and adults and ovigerous and non-ovigerous adult females. Prevalence of infestation did not differ significantly among crabs in different molt stages. Mean intensity did not differ significantly between males and females nor among crabs in different molt stages. Significant differences in mean intensity were observed between ovigerous and non-ovigerous adult females of Callinectes danae. A positive correlation was observed between prevalence of infestation and the carapace width of Callinectes danae females. The prevalence of infestation in Callinectes ornatus was 8.0%; the mean intensity of infestation was 2.7±0.4 while intensity ranged from 1 to 9. Prevalence and mean intensity of infestation did not differ significantly between males and females and juveniles and adults. Prevalence did not differ significantly among crabs in different molt stages. No correlation was observed between the prevalence of infestation and the carapace width of males and females of Callinectes ornatus.
Rafael Robles - One of the best experts on this subject based on the ideXlab platform.
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Molecular phylogeny of the American Callinectes Stimpson, 1860 (Brachyura: Portunidae), based on two partial mitochondrial genes
Marine Biology, 2007Co-Authors: Rafael Robles, Fernando Alvarez, Christoph D. Schubart, Jesús E. Conde, Carlos Carmona-suárez, José L. Villalobos, Darryl L. FelderAbstract:The genus Callinectes encompasses 16 species of commercially important swimming crabs. Most (13) occur on the Pacific and Atlantic coasts of the Americas. We compare mtDNA regions corresponding to 964 basepairs of the large (16S) and small (12S) ribosomal subunits among American Callinectes in order to examine phylogenetic relationships. The status of Callinectes affinis Fausto-Filho and Callinectes maracaiboensis Taissoun is questioned, and C. maracaiboensis is concluded to be a junior synonym of Callinectes bocourti A. Milne-Edwards, from which it cannot be consistently distinguished. We find two major lineages, one of which includes C. affinis, C. bocourti , Callinectes rathbunae Contreras, Callinectes sapidus Rathbun, and Callinectes toxotes Ordway. A second lineage is comprised of Callinectes arcuatus Ordway, Callinectes bellicosus (Stimpson), Callinectes danae Smith, Callinectes exasperatus (Gerstaecker), Callinectes larvatus Ordway, Callinectes ornatus Ordway, and Callinectes similis Williams. Definition of these clades is supported by previously described morphological differences in the length of the gonopods and shared physioecological adaptations. A calibrated molecular clock is used to estimate divergence of the two lineages near 13 mybp. Our analyses suggest that C. ornatus is the closest relative of C. arcuatus , and that C. affinis is closest to C. bocourti .
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Lack of divergence between 16S mtDNA sequences of the swimming crabs Callinectes bocourti and C. maracaiboensis (Brachyura: Portunidae) from Venezuela*
2001Co-Authors: Christoph D. Schubart, Rafael Robles, Jesús E. Conde, Carlos A. Carmona-suárez, Darryl L. FelderAbstract:Swimming crabs of the genus Callinectes Stimpson, 1860 are widely dis tributed throughout the American tropics and subtropics, where many species are exploited commercially (Norse, 1977; Williams, 1984). Members of this genus play key trophic roles in coastal habitats that range from sandy-mud bottoms to seagrass meadows (Arnold, 1984; Orth and van Montfrans, 1987; Wilson et al., 1987; Lin, 1991). Of the nine species of Callinectes from the tropical western Atlantic, seven have been reported from western Venezuela (Rodriguez, 1980; Williams, 1984; Carmona-Suarez and Conde, 1996). However, knowledge of these Venezuelan populations remains inadequate, despite the importance of several species in both large-scale commercial harvests and artisanal fi sheries of coastal villages in the area (Oesterling and Petrocci, 1995; FerrerMontano, 1997; Conde and Rodriguez, 1999). Persistent diffi culty in identifying mixed samples of these species hampers understanding of their distribution, abundance, and population dynamics, Lack of divergence between 16S mtDNA sequences of the swimming crabs Callinectes bocourti and C. maracaiboensis (Brachyura: Portunidae) from Venezuela*
Cynthia Santos - One of the best experts on this subject based on the ideXlab platform.
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INFESTATION BY OCTOLASMIS LOWEI (CIRRIPEDIA: POECILASMATIDAE) IN Callinectes DANAE AND Callinectes ORNATUS (DECAPODA: PORTUNIDAE) FROM SÃO SEBASTIÃO, BRAZIL
Journal of Crustacean Biology, 2002Co-Authors: Cynthia Santos, Sérgio Luiz De Siqueira BuenoAbstract:Abstract Two species of blue crabs were investigated with regard to infestation of the branchial chambers by the pedunculate cirriped Octolasmis lowei. In Callinectes danae, the frequency of infestation was 22.4%, and the mean intensity of infestation was 2.2 ± 0.2 (range: 1–8). Prevalence and mean intensity of infestation did not differ significantly between males and females of C. danae. Significant differences in prevalence were observed between juveniles and adults, between ovigerous and nonovigerous adult females, and among blue crabs in different molt stages. No correlation was observed between the prevalence of infestation by O. lowei and the carapace width of male or female blue crabs. In Callinectes ornatus, the prevalence of infestation by O. lowei was 12.1%, and the mean intensity observed was 4.0 ± 1.3 (range: 1–49). Prevalence of infestation did not differ significantly among crabs in different molt stages but differed between juveniles and adults and between male and female crabs. A positive...
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Prevalence and mean intensity of infestation by Carcinonemertes carcinophila imminuta (Nemertea: Carcinonemertidae) in the gills of Callinectes danae and Callinectes ornatus (Decapoda: Portunidae) from São Sebastião, Brazil
Hydrobiologia, 2001Co-Authors: Cynthia Santos, Sérgio Luiz De Siqueira BuenoAbstract:The nemerteans of the genus Carcinonemertes live in association with decapod crustaceans. Juveniles of Carcinonemertes carcinophila imminuta Humes, 1942 are found in the gills of their hosts. A total of 281 specimens (52 males and 229 females) of Callinectes danae Smith, 1869 and 373 (332 males and 41 females) of Callinectes ornatus Ordway, 1863 were inspected for the occurrence of Carcinonemertes carcinophila imminuta in their gills. The prevalence and mean intensity of infestation by these nemerteans with regard to sex, maturity, condition of adult female crabs (ovigerous or non ovigerous), size (carapace width) and molt stage of hosts were evaluated. A prevalence of infestation by Carcinonemertes carcinophila imminutaof 39.1% was found in the population of Callinectes danae; the mean intensity of infestation was 12.0±2.7, while intensity ranged from 1 to 268. In this host species, significant differences in prevalence were observed between males and females, juveniles and adults and ovigerous and non-ovigerous adult females. Prevalence of infestation did not differ significantly among crabs in different molt stages. Mean intensity did not differ significantly between males and females nor among crabs in different molt stages. Significant differences in mean intensity were observed between ovigerous and non-ovigerous adult females of Callinectes danae. A positive correlation was observed between prevalence of infestation and the carapace width of Callinectes danae females. The prevalence of infestation in Callinectes ornatus was 8.0%; the mean intensity of infestation was 2.7±0.4 while intensity ranged from 1 to 9. Prevalence and mean intensity of infestation did not differ significantly between males and females and juveniles and adults. Prevalence did not differ significantly among crabs in different molt stages. No correlation was observed between the prevalence of infestation and the carapace width of males and females of Callinectes ornatus.
Christoph D. Schubart - One of the best experts on this subject based on the ideXlab platform.
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Molecular phylogeny of the American Callinectes Stimpson, 1860 (Brachyura: Portunidae), based on two partial mitochondrial genes
Marine Biology, 2007Co-Authors: Rafael Robles, Fernando Alvarez, Christoph D. Schubart, Jesús E. Conde, Carlos Carmona-suárez, José L. Villalobos, Darryl L. FelderAbstract:The genus Callinectes encompasses 16 species of commercially important swimming crabs. Most (13) occur on the Pacific and Atlantic coasts of the Americas. We compare mtDNA regions corresponding to 964 basepairs of the large (16S) and small (12S) ribosomal subunits among American Callinectes in order to examine phylogenetic relationships. The status of Callinectes affinis Fausto-Filho and Callinectes maracaiboensis Taissoun is questioned, and C. maracaiboensis is concluded to be a junior synonym of Callinectes bocourti A. Milne-Edwards, from which it cannot be consistently distinguished. We find two major lineages, one of which includes C. affinis, C. bocourti , Callinectes rathbunae Contreras, Callinectes sapidus Rathbun, and Callinectes toxotes Ordway. A second lineage is comprised of Callinectes arcuatus Ordway, Callinectes bellicosus (Stimpson), Callinectes danae Smith, Callinectes exasperatus (Gerstaecker), Callinectes larvatus Ordway, Callinectes ornatus Ordway, and Callinectes similis Williams. Definition of these clades is supported by previously described morphological differences in the length of the gonopods and shared physioecological adaptations. A calibrated molecular clock is used to estimate divergence of the two lineages near 13 mybp. Our analyses suggest that C. ornatus is the closest relative of C. arcuatus , and that C. affinis is closest to C. bocourti .
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Lack of divergence between 16S mtDNA sequences of the swimming crabs Callinectes bocourti and C. maracaiboensis (Brachyura: Portunidae) from Venezuela*
2001Co-Authors: Christoph D. Schubart, Rafael Robles, Jesús E. Conde, Carlos A. Carmona-suárez, Darryl L. FelderAbstract:Swimming crabs of the genus Callinectes Stimpson, 1860 are widely dis tributed throughout the American tropics and subtropics, where many species are exploited commercially (Norse, 1977; Williams, 1984). Members of this genus play key trophic roles in coastal habitats that range from sandy-mud bottoms to seagrass meadows (Arnold, 1984; Orth and van Montfrans, 1987; Wilson et al., 1987; Lin, 1991). Of the nine species of Callinectes from the tropical western Atlantic, seven have been reported from western Venezuela (Rodriguez, 1980; Williams, 1984; Carmona-Suarez and Conde, 1996). However, knowledge of these Venezuelan populations remains inadequate, despite the importance of several species in both large-scale commercial harvests and artisanal fi sheries of coastal villages in the area (Oesterling and Petrocci, 1995; FerrerMontano, 1997; Conde and Rodriguez, 1999). Persistent diffi culty in identifying mixed samples of these species hampers understanding of their distribution, abundance, and population dynamics, Lack of divergence between 16S mtDNA sequences of the swimming crabs Callinectes bocourti and C. maracaiboensis (Brachyura: Portunidae) from Venezuela*
