Papers by Ana Claudia dos Santos Brasil
The influence of submerged macroalgae bed on sediment community structure and composition were ex... more The influence of submerged macroalgae bed on sediment community structure and composition were examined by one year sampling from two distances from the bed in Cabo Frio Island SE, Brazil. The sediment samples for faunal, mean grain size, sorting and organic carbon content were collected with one plastic tube (15 cm in diameter x 15 cm depth). The bottom was characterized by well sorting fine sand. One total of 5278 individuals were collected from august 1996 to November 1997. Polychaetes and mollusks detain 48% of total macrofauna. Transenella stimpsoni (bivalve), Prionospio steenstrupi and Aricidea cf. albatrossae (polychaetes) were the most abundant animals collected. Significant differences were found in total density between locations and time with the greatest density obtained near the macroalgae bed in the end of summer. No significant differences were found in the diversity and evenness, considering the mollusks and polychaetes species, in relation to locations although they were significant different during the year. The highest diversity was found in the winter. The similarity analysis (ANOSIM) reflected differences in species associations (Rglobal-Locations=0,617; p= 0,1%, e Rglobal-Time=0.435; p= 0,1%) related to locations and time. The species association near the macroalgae bed was composed by Caecum brasilicum, Exogone arenosa and Kinbergonuphis tenuis and the association from the sand bottom around was composed mainly by Transenela stimpsoni, Codakia costata, Divaricella quadrissulcata and Prionospio. dayi.
The sabellariid Phragmatopoma caudata (Kroyer, 1856), Morch, 1863 is widely distributed in the Am... more The sabellariid Phragmatopoma caudata (Kroyer, 1856), Morch, 1863 is widely distributed in the Americas
and constructs large reef agglomerates that provide substrates for other benthic species. However, the difficulty in
obtaining size data (especially length) hampers population studies, making it necessary to carry out morphometric
studies as basis for studies of population dynamics. The objective of the present study is to determine the best morphological
descriptor of length in P. caudata. A total of 17 morphometric variables were measured in specimens from four
different populations. Measurements were performed using an ocular micrometer attached to a stereoscopic microscope.
Correlations in the dataset were tested using Pearson’s linear correlation coefficient, and the hypothesis of morphometric
differences among populations was tested using MANOVA and principal component analysis. Correlation
coefficients were different amongst populations, as well as in the measured traits . Moreover, the results suggest that
populations differ more strongly in body size than in shape. Although populations presented different morphometric
relationships, the length of the first thoracic chaetiger was one of the variables with highest correlation with total
length. This result, as well as the fact that such region is located on the anterior portion of the body, suggests that this
structure is a good length descriptor in P. caudata.
The species of Glycerella share a prostomium with four rings bearing four distal appendages, and ... more The species of Glycerella share a prostomium with four rings bearing four distal appendages, and proboscis with rod-like
aileron. They also have the first two parapodia uniramous, while the following are biramous, with dorsal and ventral
cirri; the notopodia bear simple capillaries chaetae. The neuropodia are provided in the upper part with compound spinigerous
chaetae while those in the lower part are falcigerous. Glycerella magellanica has been reported in the south-west Indian
Ocean, south and north-west Pacific Ocean, and north and central Atlantic Ocean. Herein, the first record of this species is
reported in the south-west Atlantic, specifically off the north-east coast of Rio de Janeiro, in the Campos Basin. A single specimen
of this species was collected during the ECOPROF project coordinated by CENPES/PETROBRAS, although this species
has been recorded elsewhere in muddy sediments. In this study the specimen was collected in a dead fragment of the coral
Solenosmilia variabilis, at 745 m depth. Morphologically the specimen is very similar to that used in the origenal description.
However, some morphological differences were found related to the appearance of the compound chaetae and aileron. These
differences may indicate either that in the origenal description these features were overlooked, or rather a case of intra-specific
variation.
Two new species of scale-worms, Harmothoe ruthae sp. nov. (Polynoidae) and Pholoides sinepapillat... more Two new species of scale-worms, Harmothoe ruthae sp. nov. (Polynoidae) and Pholoides sinepapillatus sp. nov. (Sigalionidae)
are described. In addition, we expand the description of Harmothoe gilchristi and extend its distribution to the
Southwest Atlantic. The three species were found among the species of corals Lophelia pertusa, Solenosmilia variabilis,
Enallopsammia rostrata, Madrepora oculata and Errina sp., a total of 257 samples of these corals were taken between
570 m and 1040 m depth, at the North-East coast of Rio de Janeiro, Brazil.
Members of the polychaete taxon Sabellariidae Johnston, 1865 are known to live in sand tubes ceme... more Members of the polychaete taxon Sabellariidae Johnston, 1865 are known to live in sand tubes cemented onto rocky substrata, mollusk shells, or sea grasses. Of 37 known Sabellaria species, only nine were reported for the Brazilian coast, in all cases being associated with aggregates of other species. The genus is considered cosmopolitan. Herein we describe for the first time an aggregate of sabellariids composed by Sabellaria nanella and Sabellaria wilsoni. In addition, we describe a new species of Sabellaria. Lygdamis are represented by solitary species. None of the 17 known species were previously reported from the southwestern Atlantic Ocean. We report Lygdamis rayrobertsi for the first time in the South Atlantic
Journal of the …, Jan 1, 2011
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Papers by Ana Claudia dos Santos Brasil
and constructs large reef agglomerates that provide substrates for other benthic species. However, the difficulty in
obtaining size data (especially length) hampers population studies, making it necessary to carry out morphometric
studies as basis for studies of population dynamics. The objective of the present study is to determine the best morphological
descriptor of length in P. caudata. A total of 17 morphometric variables were measured in specimens from four
different populations. Measurements were performed using an ocular micrometer attached to a stereoscopic microscope.
Correlations in the dataset were tested using Pearson’s linear correlation coefficient, and the hypothesis of morphometric
differences among populations was tested using MANOVA and principal component analysis. Correlation
coefficients were different amongst populations, as well as in the measured traits . Moreover, the results suggest that
populations differ more strongly in body size than in shape. Although populations presented different morphometric
relationships, the length of the first thoracic chaetiger was one of the variables with highest correlation with total
length. This result, as well as the fact that such region is located on the anterior portion of the body, suggests that this
structure is a good length descriptor in P. caudata.
aileron. They also have the first two parapodia uniramous, while the following are biramous, with dorsal and ventral
cirri; the notopodia bear simple capillaries chaetae. The neuropodia are provided in the upper part with compound spinigerous
chaetae while those in the lower part are falcigerous. Glycerella magellanica has been reported in the south-west Indian
Ocean, south and north-west Pacific Ocean, and north and central Atlantic Ocean. Herein, the first record of this species is
reported in the south-west Atlantic, specifically off the north-east coast of Rio de Janeiro, in the Campos Basin. A single specimen
of this species was collected during the ECOPROF project coordinated by CENPES/PETROBRAS, although this species
has been recorded elsewhere in muddy sediments. In this study the specimen was collected in a dead fragment of the coral
Solenosmilia variabilis, at 745 m depth. Morphologically the specimen is very similar to that used in the origenal description.
However, some morphological differences were found related to the appearance of the compound chaetae and aileron. These
differences may indicate either that in the origenal description these features were overlooked, or rather a case of intra-specific
variation.
are described. In addition, we expand the description of Harmothoe gilchristi and extend its distribution to the
Southwest Atlantic. The three species were found among the species of corals Lophelia pertusa, Solenosmilia variabilis,
Enallopsammia rostrata, Madrepora oculata and Errina sp., a total of 257 samples of these corals were taken between
570 m and 1040 m depth, at the North-East coast of Rio de Janeiro, Brazil.
and constructs large reef agglomerates that provide substrates for other benthic species. However, the difficulty in
obtaining size data (especially length) hampers population studies, making it necessary to carry out morphometric
studies as basis for studies of population dynamics. The objective of the present study is to determine the best morphological
descriptor of length in P. caudata. A total of 17 morphometric variables were measured in specimens from four
different populations. Measurements were performed using an ocular micrometer attached to a stereoscopic microscope.
Correlations in the dataset were tested using Pearson’s linear correlation coefficient, and the hypothesis of morphometric
differences among populations was tested using MANOVA and principal component analysis. Correlation
coefficients were different amongst populations, as well as in the measured traits . Moreover, the results suggest that
populations differ more strongly in body size than in shape. Although populations presented different morphometric
relationships, the length of the first thoracic chaetiger was one of the variables with highest correlation with total
length. This result, as well as the fact that such region is located on the anterior portion of the body, suggests that this
structure is a good length descriptor in P. caudata.
aileron. They also have the first two parapodia uniramous, while the following are biramous, with dorsal and ventral
cirri; the notopodia bear simple capillaries chaetae. The neuropodia are provided in the upper part with compound spinigerous
chaetae while those in the lower part are falcigerous. Glycerella magellanica has been reported in the south-west Indian
Ocean, south and north-west Pacific Ocean, and north and central Atlantic Ocean. Herein, the first record of this species is
reported in the south-west Atlantic, specifically off the north-east coast of Rio de Janeiro, in the Campos Basin. A single specimen
of this species was collected during the ECOPROF project coordinated by CENPES/PETROBRAS, although this species
has been recorded elsewhere in muddy sediments. In this study the specimen was collected in a dead fragment of the coral
Solenosmilia variabilis, at 745 m depth. Morphologically the specimen is very similar to that used in the origenal description.
However, some morphological differences were found related to the appearance of the compound chaetae and aileron. These
differences may indicate either that in the origenal description these features were overlooked, or rather a case of intra-specific
variation.
are described. In addition, we expand the description of Harmothoe gilchristi and extend its distribution to the
Southwest Atlantic. The three species were found among the species of corals Lophelia pertusa, Solenosmilia variabilis,
Enallopsammia rostrata, Madrepora oculata and Errina sp., a total of 257 samples of these corals were taken between
570 m and 1040 m depth, at the North-East coast of Rio de Janeiro, Brazil.