INVESTIGADORES
DIAZ DE ASTARLOA Juan Martin
artículos
Título:
Food habits of the broad nose skate, Bathyraja brachyurops (Chondrichthyes, Rajidae), in the South-west Atlantic
Autor/es:
BELLEGIA, M; MABRAGAÑA, E.; FIGUEROA, D. E.; SCENNA, L. B.; BARBINI, S. A.; DÍAZ DE ASTARLOA, J. M.
Revista:
SCIENTIA MARINA
Editorial:
INST CIENCIAS MAR BARCELONA
Referencias:
Lugar: Barcelona; Año: 2008 vol. 72 p. 701 - 710
ISSN:
0214-8358
Resumen:
Food habits of Bathyraja brachyurops were studied based on stomach content analyses of 346 specimens
collected from research cruises carried out from 2003 to 2005 on the Argentinean continental shelf (36oS-55oS). A total of
265 stomachs (76.6%) contained food, and thirty-five taxonomic levels of prey were identified. The most important prey
were fishes followed by isopods. Trophic level analysis revealed that B. brachyurops is a tertiary consumer throughout its
life history. There were no differences between sexes and regions in the diet composition, but dietary shifts with ontogeny
were found. The Levins standardized index indicated wider niche breadth for small skates, whereas larger skate specimens
showed a narrow niche breadth with a specialization in fishes.
life history. There were no differences between sexes and regions in the diet composition, but dietary shifts with ontogeny
were found. The Levins standardized index indicated wider niche breadth for small skates, whereas larger skate specimens
showed a narrow niche breadth with a specialization in fishes.
265 stomachs (76.6%) contained food, and thirty-five taxonomic levels of prey were identified. The most important prey
were fishes followed by isopods. Trophic level analysis revealed that B. brachyurops is a tertiary consumer throughout its
life history. There were no differences between sexes and regions in the diet composition, but dietary shifts with ontogeny
were found. The Levins standardized index indicated wider niche breadth for small skates, whereas larger skate specimens
showed a narrow niche breadth with a specialization in fishes.
life history. There were no differences between sexes and regions in the diet composition, but dietary shifts with ontogeny
were found. The Levins standardized index indicated wider niche breadth for small skates, whereas larger skate specimens
showed a narrow niche breadth with a specialization in fishes.
collected from research cruises carried out from 2003 to 2005 on the Argentinean continental shelf (36oS-55oS). A total of
265 stomachs (76.6%) contained food, and thirty-five taxonomic levels of prey were identified. The most important prey
were fishes followed by isopods. Trophic level analysis revealed that B. brachyurops is a tertiary consumer throughout its
life history. There were no differences between sexes and regions in the diet composition, but dietary shifts with ontogeny
were found. The Levins standardized index indicated wider niche breadth for small skates, whereas larger skate specimens
showed a narrow niche breadth with a specialization in fishes.
life history. There were no differences between sexes and regions in the diet composition, but dietary shifts with ontogeny
were found. The Levins standardized index indicated wider niche breadth for small skates, whereas larger skate specimens
showed a narrow niche breadth with a specialization in fishes.
265 stomachs (76.6%) contained food, and thirty-five taxonomic levels of prey were identified. The most important prey
were fishes followed by isopods. Trophic level analysis revealed that B. brachyurops is a tertiary consumer throughout its
life history. There were no differences between sexes and regions in the diet composition, but dietary shifts with ontogeny
were found. The Levins standardized index indicated wider niche breadth for small skates, whereas larger skate specimens
showed a narrow niche breadth with a specialization in fishes.
life history. There were no differences between sexes and regions in the diet composition, but dietary shifts with ontogeny
were found. The Levins standardized index indicated wider niche breadth for small skates, whereas larger skate specimens
showed a narrow niche breadth with a specialization in fishes.
Bathyraja brachyurops were studied based on stomach content analyses of 346 specimens
collected from research cruises carried out from 2003 to 2005 on the Argentinean continental shelf (36oS-55oS). A total of
265 stomachs (76.6%) contained food, and thirty-five taxonomic levels of prey were identified. The most important prey
were fishes followed by isopods. Trophic level analysis revealed that B. brachyurops is a tertiary consumer throughout its
life history. There were no differences between sexes and regions in the diet composition, but dietary shifts with ontogeny
were found. The Levins standardized index indicated wider niche breadth for small skates, whereas larger skate specimens
showed a narrow niche breadth with a specialization in fishes.
life history. There were no differences between sexes and regions in the diet composition, but dietary shifts with ontogeny
were found. The Levins standardized index indicated wider niche breadth for small skates, whereas larger skate specimens
showed a narrow niche breadth with a specialization in fishes.
265 stomachs (76.6%) contained food, and thirty-five taxonomic levels of prey were identified. The most important prey
were fishes followed by isopods. Trophic level analysis revealed that B. brachyurops is a tertiary consumer throughout its
life history. There were no differences between sexes and regions in the diet composition, but dietary shifts with ontogeny
were found. The Levins standardized index indicated wider niche breadth for small skates, whereas larger skate specimens
showed a narrow niche breadth with a specialization in fishes.
life history. There were no differences between sexes and regions in the diet composition, but dietary shifts with ontogeny
were found. The Levins standardized index indicated wider niche breadth for small skates, whereas larger skate specimens
showed a narrow niche breadth with a specialization in fishes.
oS-55oS). A total of
265 stomachs (76.6%) contained food, and thirty-five taxonomic levels of prey were identified. The most important prey
were fishes followed by isopods. Trophic level analysis revealed that B. brachyurops is a tertiary consumer throughout its
life history. There were no differences between sexes and regions in the diet composition, but dietary shifts with ontogeny
were found. The Levins standardized index indicated wider niche breadth for small skates, whereas larger skate specimens
showed a narrow niche breadth with a specialization in fishes.
life history. There were no differences between sexes and regions in the diet composition, but dietary shifts with ontogeny
were found. The Levins standardized index indicated wider niche breadth for small skates, whereas larger skate specimens
showed a narrow niche breadth with a specialization in fishes.
B. brachyurops is a tertiary consumer throughout its
life history. There were no differences between sexes and regions in the diet composition, but dietary shifts with ontogeny
were found. The Levins standardized index indicated wider niche breadth for small skates, whereas larger skate specimens
showed a narrow niche breadth with a specialization in fishes.