Linking contaminant profiles to the diet and breeding location of American dippers using stable isotopes

Journal of Applied Ecology - Tập 41 Số 3 - Trang 502-512 - 2004
Christy A. Morrissey1, Leah I. Bendell‐Young1, John E. Elliott2,1
1Department of Biological Sciences, Simon Fraser University, 8888 University Drive, Burnaby, British Columbia, Canada V5A 1S6; and
2Canadian Wildlife Service, Environment Canada, 5421 Robertson Road, Delta, British Columbia, Canada V4K 3 N2

Tóm tắt

Summary Individual variation in contaminant levels is a common occurrence in many toxicology studies, but the exact cause is often unclear. We investigated the influence of diet and breeding location on individual bird contaminant profiles using a colour‐marked population of American dippers Cinclus mexicanus. The population comprised two distinct groups within a single river system: resident dippers breeding on the main river and altitudinal migrants breeding on tributaries. Residue analysis revealed that total organochlorines (OC), polychlorinated biphenyls (PCB) and mercury (Hg) were all significantly higher in eggs from river residents compared with tributary migrants. This trend was also apparent for the three most prevalent organochlorine compounds: p,p′‐dichlorodiphenyl‐dichloroethylene (DDE), hexachlorobenzene and trans‐nonachlor. We hypothesized that the observed differences in contaminant concentrations were partially related to the proportion of salmon fry Oncorhynchus spp. in the diet relative to aquatic invertebrates. Stable isotope analyses using δ13C and δ15N were conducted on blood and feathers of dippers in addition to aquatic invertebrates and salmon fry prey. Linear mixing models using the 15N isotope in the dippers’ diet and blood revealed considerable variability in the proportion of fish consumed (0–71%). Resident dippers on the main river ate significantly higher proportions of fish (42%) than tributary migrants (22%) (P = 0·01). The difference in diet between migratory groups explained some of the observed variation in egg contaminant profiles, as total OC (P = 0·002) in dipper eggs was positively correlated with blood δ15N values, indicating fish may be the primary source of contamination. Synthesis and applications. We conclude that dipper eggs represent local conditions at the breeding site, making them useful tools for biomonitoring aquatic contaminants in watersheds. However, given the distinct difference in contaminant profiles between resident and migrant dippers and the link with diet, the results emphasize the importance of understanding individual species’ ecology for assessing toxicological effects at the population level.

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Tài liệu tham khảo

American Ornithologists’ Union, 1998, Checklist of North American Birds. The Species of Birds of North America from the Arctic through Panama including the West Indies and Hawaiian Islands

10.2307/4081776

10.2307/1365310

10.1016/S0025-326X(99)00205-2

10.1086/342800

10.1007/s004420000570

Beyer W.N., 1996, Environmental Contaminants in Wildlife: Interpreting Tissue Concentrations

Bilby R.E., 1996, Incorporation of nitrogen and carbon from spawning coho salmon into the trophic system of small streams: evidence from stable isotopes, Canadian Journal of Fisheries and Aquatic Science, 53, 164, 10.1139/f95-159

10.1139/f98-094

10.1016/S0269-7491(01)00186-5

10.1002/etc.5620110307

10.1023/A:1008938603257

10.1038/372255a0

Connel D.W., 1990, Bioaccumulation of Xenobiotic Compounds

10.1002/9780470999776

Ealey D.M.(1977)Aspects of the ecology and behaviour of a breeding population of dippers (Cinclus mexicanus:Passeriformes) in southern Alberta.MSc Thesis.University of Alberta Edmonton Canada.

Evans Ogden L.(2002)Non‐breeding shorebirds in a coastal agricultural landscape: winter habitat use and dietary sources.PhD Dissertation.Simon Fraser University Burnaby Canada.

10.2307/1941580

Giller P.S., 2000, The Biology of Streams and Rivers

10.1890/1051-0761(1998)008[0669:WSAMAC]2.0.CO;2

10.1021/es960408p

10.1007/s004420050865

10.2307/1368807

10.2307/1368207

10.1021/es950392n

Johnston N.T., 1997, A Preliminary Study of the Role of Sockeye Salmon (Oncorhynchus nerka) Carcasses as Carbon and Nitrogen Sources for Benthic Insects and Fishes in the ‘Early Stuart’ Stock Spawning Streams, 1050 km from the Ocean.

10.1139/z99-165

Kerlin R.E., 1964, Venipuncture of small birds, Journal of American Veterinary Medical Association, 144, 870

10.1016/0048-9697(95)04371-7

Kingery H.E., 1996, The Birds of North America, No. 229, 1

10.1139/f95-855

Lajtha K., 1994, Stable Isotopes in Ecology and Environmental Science

10.1007/BF00547213

Mitchell P.A.(1968)The food of the dipper (Cinclus mexicanus swainson) on two western Montana streams.MSc Thesis. University of Montana Missoula MT.

10.2307/1940684

Morrissey C.A.(2003)The ecological and toxicological significance of altitudinal migration by the American dipper (Cinclus mexicanus).PhD Dissertation.Simon Fraser University Burnaby Canada.

Neugebauer E.A., 2000, Methods for the Determination of Metals in Wildlife Tissues Using Various Atomic Absorption Spectrophotometry Techniques

10.1016/S0269-7491(02)00336-6

O'Halloran J., 1993, Organochlorine and mercury content of dipper eggs in south‐west Ireland, Biology and Environment, 93, 25

10.1080/00063659009477054

10.1016/0269-7491(92)90142-W

10.1016/S0269-7491(99)00313-9

10.1007/BF01769958

10.1111/j.1474-919X.1996.tb04308.x

10.1146/annurev.es.18.110187.001453

10.1007/s004420000578

Price F.E., 1983, Population Ecology of the Dipper (Cinclus mexicanus) in the Front Range of Colorado.

Richardson J., 1836, Fauna Boreali‐Americana; or the zoology of the northern parts of British America: containing descriptions of the objects of natural history collected on the late northern land expeditions, under the command of Sir John Franklin, R.N, Fauna Boreali-Americana, 1

10.2307/3802302

10.1111/j.1365-2427.1985.tb00193.x

SAS Institute Inc. (2002)JMP Version 4·0. Cary NC.

10.1080/00063658609476909

10.1002/etc.5620210117

10.1007/978-1-4612-2656-7_2

10.1139/f80-017

Walbaum J.J., 1792, Quibus systema totum ichthyologiae proponitur cum classibus, ordinibus, generum characteribus, specierum differentiis, observationibus plurimis. Redactis speciebus 242 ad genera 52, Ichthyologiae, 3

Won H.T., 2000, Multi Residue Methods for the Determination of Chlorinated Pesticides and Polychlorinated Biphenyls (PCBs) in Wildlife Tissues by Gas Chromatography/Mass Spectrometry