INVESTIGADORES
CRESPO Enrique Alberto
artículos
Título:
Diet of lactating South American sea lions, as inferred from stable isotopes, influences pup growth. En prensa en Marine Mammal Science.
Autor/es:
DRAGO, M., L. CARDONA, A. AGUILAR, E.A. CRESPO, S. AMEGHINO & N.A. GARCÍA
Revista:
MARINE MAMMAL SCIENCE
Editorial:
Wyley-Blackwell
Referencias:
Año: 2009 vol. 26 p. 309 - 323
ISSN:
0824-0469
Resumen:
Serum and blood cell 13C and 15N signals from 26 suckling pups of the South
American sea lion from northern Patagonia were used as proxies of the composition
of their mothers diet to test the hypothesis that the foraging habits of the mother
influence pup growth. Samples of primary producers and the female potential prey
were analyzed to establish baseline isotopic values and to determine energy density.
Pups were weighed to determine specific growth rate. Individual variability in
female diet was large, probably as a consequence of dissimilarities in the foraging
performance that depends on the individuals age, body size, and/or foraging skills.
Growth of a pup was influenced by its mothers diet, as pups of females mostly
relying on pelagic offshore prey were found to grow faster than those of females
basing their diet on benthic coastal prey.
American sea lion from northern Patagonia were used as proxies of the composition
of their mothers diet to test the hypothesis that the foraging habits of the mother
influence pup growth. Samples of primary producers and the female potential prey
were analyzed to establish baseline isotopic values and to determine energy density.
Pups were weighed to determine specific growth rate. Individual variability in
female diet was large, probably as a consequence of dissimilarities in the foraging
performance that depends on the individuals age, body size, and/or foraging skills.
Growth of a pup was influenced by its mothers diet, as pups of females mostly
relying on pelagic offshore prey were found to grow faster than those of females
basing their diet on benthic coastal prey.
American sea lion from northern Patagonia were used as proxies of the composition
of their mothers diet to test the hypothesis that the foraging habits of the mother
influence pup growth. Samples of primary producers and the female potential prey
were analyzed to establish baseline isotopic values and to determine energy density.
Pups were weighed to determine specific growth rate. Individual variability in
female diet was large, probably as a consequence of dissimilarities in the foraging
performance that depends on the individuals age, body size, and/or foraging skills.
Growth of a pup was influenced by its mothers diet, as pups of females mostly
relying on pelagic offshore prey were found to grow faster than those of females
basing their diet on benthic coastal prey.
American sea lion from northern Patagonia were used as proxies of the composition
of their mothers diet to test the hypothesis that the foraging habits of the mother
influence pup growth. Samples of primary producers and the female potential prey
were analyzed to establish baseline isotopic values and to determine energy density.
Pups were weighed to determine specific growth rate. Individual variability in
female diet was large, probably as a consequence of dissimilarities in the foraging
performance that depends on the individuals age, body size, and/or foraging skills.
Growth of a pup was influenced by its mothers diet, as pups of females mostly
relying on pelagic offshore prey were found to grow faster than those of females
basing their diet on benthic coastal prey.
American sea lion from northern Patagonia were used as proxies of the composition
of their mothers diet to test the hypothesis that the foraging habits of the mother
influence pup growth. Samples of primary producers and the female potential prey
were analyzed to establish baseline isotopic values and to determine energy density.
Pups were weighed to determine specific growth rate. Individual variability in
female diet was large, probably as a consequence of dissimilarities in the foraging
performance that depends on the individuals age, body size, and/or foraging skills.
Growth of a pup was influenced by its mothers diet, as pups of females mostly
relying on pelagic offshore prey were found to grow faster than those of females
basing their diet on benthic coastal prey.
13C and 15N signals from 26 suckling pups of the South
American sea lion from northern Patagonia were used as proxies of the composition
of their mothers diet to test the hypothesis that the foraging habits of the mother
influence pup growth. Samples of primary producers and the female potential prey
were analyzed to establish baseline isotopic values and to determine energy density.
Pups were weighed to determine specific growth rate. Individual variability in
female diet was large, probably as a consequence of dissimilarities in the foraging
performance that depends on the individuals age, body size, and/or foraging skills.
Growth of a pup was influenced by its mothers diet, as pups of females mostly
relying on pelagic offshore prey were found to grow faster than those of females
basing their diet on benthic coastal prey.