Sexual foraging segregation in South American sea lions increases during the pre-breeding period in the Rio de la Plata plume

被引:21
作者
Drago, M. [1 ]
Franco-Trecu, V. [2 ]
Zenteno, L. [3 ,4 ]
Szteren, D. [5 ]
Crespo, E. A. [6 ,7 ]
Riet Sapriza, F. G. [2 ]
de Oliveira, L. [8 ]
Machado, R. [8 ,9 ]
Inchausti, P. [1 ]
Cardona, L. [3 ,4 ]
机构
[1] Univ Republ, Ctr Univ Reg Este, Dept Ecol & Evolut, Maldonado 20000, Uruguay
[2] Univ Republica, Fac Ciencias, Secc Etol, Proyecto Pinnipedos, Montevideo 11400, Uruguay
[3] Univ Barcelona, Fac Biol, IRBIO, Barcelona 08028, Spain
[4] Univ Barcelona, Fac Biol, Dept Anim Biol, Barcelona 08028, Spain
[5] Univ Republica, Fac Ciencias, Dept Ecol & Evoluc, Montevideo 11400, Uruguay
[6] Consejo Nacl Invest Cient & Tecn, Ctr Nacl Patagon CENPAT, Lab Marine Mammals, RA-9120 Puerto Madryn, Chubut, Argentina
[7] Natl Univ Patagonia, RA-9120 Puerto Madryn, Chubut, Argentina
[8] Study Grp Aquat Mammals Rio Grande Sul GEMARS, BR-95625000 Imbe, RS, Brazil
[9] Univ Fed Rio Grande do Sul, Dept Zool IB, Lab Sistemat & Ecol Aves & Mamiferos Marinhos Lab, BR-91509900 Porto Alegre, RS, Brazil
关键词
Otaria flavescens; Sexual foraging segregation; Skin; Bone; Stable isotope Bayesian ellipses; STABLE-ISOTOPE RATIOS; OTARIA-FLAVESCENS; LIPID EXTRACTION; NEW-ZEALAND; DIET; BEHAVIOR; CARBON; ECOLOGY; EXPENDITURE; PHYSIOLOGY;
D O I
10.3354/meps11236
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
Stable carbon and nitrogen isotopes in skin and bone of South American sea lions from Brazil and Uruguay were analysed to test the hypothesis that trophic overlap between the sexes is lower during the pre-breeding season than throughout the rest of the year. The isotopic values of skin and bone were used to infer the trophic relationships between the sexes during the pre-breeding period and year round, respectively. Prey species were also analysed to establish a baseline necessary for interpreting the stable isotope ratios of skin and bone. Standard ellipse areas, estimated using Bayesian inference in the SIBER routine of the SIAR package in R, suggested that males and females used a wide diversity of foraging strategies throughout the year and that no differences existed between the sexes. However, the diversity of foraging strategies was largely reduced during the pre-breeding period, with all the individuals of each sex adopting similar strategies, but with the two sexes differing considerably in stable isotope values and the ellipse areas of males and females not overlapping at all. Nevertheless, the results revealed a general increase in the consumption of pelagic prey by both sexes during the pre-breeding period. The progressive crowding of individuals in the areas surrounding the breeding rookeries during the pre-breeding period could lead to an increase in the local population density, which could explain the above reported changes.
引用
收藏
页码:261 / 272
页数:12
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