Integrating Stomach Content and Stable Isotope Analyses to Quantify the Diets of Pygoscelid Penguins

被引:119
作者
Polito, Michael J. [1 ]
Trivelpiece, Wayne Z. [2 ]
Karnovsky, Nina J. [3 ]
Ng, Elizabeth [3 ]
Patterson, William P. [4 ]
Emslie, Steven D. [1 ]
机构
[1] Univ N Carolina, Dept Biol & Marine Biol, Wilmington, NC 28401 USA
[2] Natl Marine Fisheries Serv, Antarctic Ecosyst Res Div, SW Fisheries Sci Ctr, La Jolla, CA 92038 USA
[3] Pomona Coll, Dept Biol, Claremont, CA 91711 USA
[4] Univ Saskatchewan, Dept Geol Sci, Isotope Lab, Saskatoon, SK S7N 0W0, Canada
来源
PLOS ONE | 2011年 / 6卷 / 10期
基金
美国国家科学基金会;
关键词
CHINSTRAP PENGUINS; ADELIE PENGUINS; TEMPORAL VARIATION; SEASONAL-CHANGES; FORAGING-NICHE; SEABIRDS; POPULATION; DIGESTION; ECOLOGY; ISLAND;
D O I
10.1371/journal.pone.0026642
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Stomach content analysis (SCA) and more recently stable isotope analysis (SIA) integrated with isotopic mixing models have become common methods for dietary studies and provide insight into the foraging ecology of seabirds. However, both methods have drawbacks and biases that may result in difficulties in quantifying inter-annual and species-specific differences in diets. We used these two methods to simultaneously quantify the chick-rearing diet of Chinstrap (Pygoscelis antarctica) and Gentoo (P. papua) penguins and highlight methods of integrating SCA data to increase accuracy of diet composition estimates using SIA. SCA biomass estimates were highly variable and underestimated the importance of soft-bodied prey such as fish. Two-source, isotopic mixing model predictions were less variable and identified inter-annual and species-specific differences in the relative amounts of fish and krill in penguin diets not readily apparent using SCA. In contrast, multi-source isotopic mixing models had difficulty estimating the dietary contribution of fish species occupying similar trophic levels without refinement using SCA-derived otolith data. Overall, our ability to track inter-annual and species-specific differences in penguin diets using SIA was enhanced by integrating SCA data to isotopic mixing modes in three ways: 1) selecting appropriate prey sources, 2) weighting combinations of isotopically similar prey in two-source mixing models and 3) refining predicted contributions of isotopically similar prey in multi-source models.
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页数:10
相关论文
共 53 条
[1]  
Ainley DG, 2003, CONDOR, V105, P95, DOI 10.1650/0010-5422(2003)105[95:SATVOD]2.0.CO
[2]  
2
[3]   Diet and foraging effort of Adelie penguins in relation to pack-ice conditions in the southern Ross Sea [J].
Ainley, DG ;
Wilson, PR ;
Barton, KJ ;
Ballard, G ;
Nur, N ;
Karl, B .
POLAR BIOLOGY, 1998, 20 (05) :311-319
[4]   Diet studies of seabirds:: a review and recommendations [J].
Barrett, Robert T. ;
Camphuysen, Kees ;
Anker-Nilssen, Tycho ;
Chardine, John W. ;
Furness, Robert W. ;
Garthe, Stefan ;
Hueppop, Ommo ;
Leopold, Mardik F. ;
Montevecchi, William A. ;
Veit, Richard R. .
ICES JOURNAL OF MARINE SCIENCE, 2007, 64 (09) :1675-1691
[5]   Recent Bayesian stable-isotope mixing models are highly sensitive to variation in discrimination factors [J].
Bond, Alexander L. ;
Diamond, Antony W. .
ECOLOGICAL APPLICATIONS, 2011, 21 (04) :1017-1023
[6]  
Bond Alexander L., 2009, Marine Ornithology, V37, P183
[7]  
Boyd IL, 2006, CONSERV BIOL SER, P1, DOI 10.2277/ 052161256X
[8]   The importance of pelagic longline fishery discards for a seabird community determined through stable isotope analysis [J].
Bugoni, Leandro ;
McGill, Rona A. R. ;
Furness, Robert W. .
JOURNAL OF EXPERIMENTAL MARINE BIOLOGY AND ECOLOGY, 2010, 391 (1-2) :190-200
[9]  
Casaux Ricardo J., 1995, Marine Ornithology, V23, P101
[10]  
CCAMLR, 1997, CCAMLR EC MON PROGR