Linking the foraging performance of a marine predator to local prey abundance

Functional Ecology - Tập 18 Số 6 - Trang 793-801 - 2004
David Grémillet1, Grégoire Kuntz1,2, Frank Delbart3, Magdel Mellet3, Akiko Kato4, Jean‐Patrice Robin1, P.‐E. Chaillon2, Jean‐Paul Gendner1, Svein‐Håkon Lorentsen5, Yvon Le Maho1
1Centre d'Ecologie et Physiologie Energétiques, Centre National de la Recherche Scientifique, 23 rue Becquerel, 67087 Strasbourg Cedex 02, France.
2Université du Québec à Rimouski, 300 allée des Ursulines, Rimouski, Québec, Canada G5L 3A1
3Institut Polaire Français Paul‐Emile Victor, Technopôle Brest‐Iroise, BP 75–29280 Plouzané, France,
4National Institute of Polar Research 1‐9‐10 Kaga, Itabashi‐ku, Tokyo 173–8515, Japan, and
5Norwegian Institute for Nature Research, Tungasletta 2, NO‐7485 Trondheim, Norway

Tóm tắt

Summary Knowledge of the functional response of predators to prey densities conditions our understanding of food webs. Such links are still poorly understood within the higher trophic levels of marine ecosystems. We present the first field study recording the foraging effort and foraging yield of a seabird (the Great Cormorant, Phalacrocorax carbo) as well as the abundance and quality of prey within its foraging area. We confirm that Great Cormorants foraging off West‐Greenland show the highest foraging performance recorded for a marine predator (between 17 and 41 g fish caught per minute underwater). Former work suggests that such high foraging yield should be based upon the exploitation of extremely profitable prey patches. Contrary to this hypothesis, average prey abundances estimated within the foraging areas of the cormorants were low (0·03–0·09 prey m−2, depending on methods), as was the average calorific value of the prey items (4·2 kJ g−1). Our study suggests that Great Cormorants remain highly successful predators even when exploiting modest prey resources. These findings have implications for our understanding of predator–prey relationships, and for the management of Great Cormorant populations.

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Tài liệu tham khảo

10.1890/0012-9658(1999)080[0288:LTROIW]2.0.CO;2

10.1111/j.1474-919X.1963.tb06766.x

10.1890/0012-9658(1997)078[1502:SCSAAP]2.0.CO;2

10.1016/S0079-6611(01)00027-1

10.2307/1937540

Born E.W., 2001, The Ecology of Greenland

Bregnballe T., 2003, Development of the breeding population of great cormorants Phalacrocorax carbo sinensis in the Netherlands, Germany, Denmark, and Sweden during the 1990s, Vogelwelt, 124, 15

Buckland S.T., 1993, Distance Sampling. Estimating Abundance of Biological Populations.

10.1086/284970

10.1006/jmsc.2002.1283

Carss D.N., 2003, Reducing the conflict between cormorants Phalacrocorax carbo and fisheries on a pan‐European scale: REDCAFE opens for business, Vogelwelt, 124, 299

10.1016/S0967-0645(98)00031-9

10.1086/340611

10.1890/02-0208

10.1098/rspb.2003.2397

10.1890/0012-9658(2000)081[0773:SDPPIT]2.0.CO;2

FishBase(2004)http://filaman.uni‐kiel.de.

10.1046/j.1365-2656.2000.00435.x

10.1006/jmsc.2002.1242

10.1038/311655a0

Grémillet D., 1996, Determining food intake by great cormorants (Phalacrocorax carbo) and European shags (Phalacrocorax aristotelis) with electronic weighing units, Journal of Field Ornithology, 67, 637

10.1006/jmsc.1997.0250

Grémillet D., 1998, Cormorants, shags and fisheries in the Chausey Islands area, Le Cormoran, 10, 196

10.1093/beheco/10.5.516

10.3354/meps188305

10.3354/meps183263

10.1046/j.1461-0248.2001.00214.x

10.1046/j.1365-2664.2003.00806.x

10.1111/j.0908-8857.2005.03331.x

Härkönen T., 1986, Guide to the Otoliths of the Bony Fishes of the North East Atlantic

10.1080/00063659309477138

10.1111/j.1469-7998.1991.tb06039.x

Hoff G.R., 2000, Biology and ecology of threaded sculpin, Gymnocanthus pistilliger, in the eastern Bering Sea, Fishery Bulletin, 98, 711

10.1098/rspb.2003.2540

10.3354/meps086015

Johnsgard P.A., 1993, Cormorants, Darters, and Pelicans of the World

10.1016/j.tree.2003.09.001

10.1038/35090566

10.1675/1524-4695(2004)027[0161:AVIDOB]2.0.CO;2

10.1111/j.1095-8649.2002.tb02465.x

10.1046/j.1365-2656.1999.00267.x

10.1073/pnas.94.26.14530

10.1034/j.1600-048X.2000.310212.x

10.1890/0012-9658(1998)079[1193:FROCAL]2.0.CO;2

10.1093/biomet/58.3.545

10.1007/s004420050256

10.1093/biomet/78.4.719

10.1007/BF00349133

10.1046/j.1365-2656.2002.00645.x

Siorat F.(2003)Faisabilité de la mise en place d’un protocole de suivi à long terme des populations de poissons littoraux sub‐tidaux de l’archipel des Sept‐Iles Côtes d’Armor.Ligue Pour le Protection Des OiseauxLN‐0203–06 unpublished report.

10.1086/284969

Tokeshi M., 1995, Quantitative analysis of foraging behavior in a field population of the South American sun star Heliaster helianthus, Marine Biology, 122, 297, 10.1007/BF00348943

10.1890/0012-9658(2002)083[3003:TEOPAP]2.0.CO;2

10.1016/S0022-0981(02)00145-4

10.1016/S0022-0981(97)00095-6

10.3354/meps198249

10.3354/meps228241

Wilson R.P., 2004, Reconstructing the past using futuristic developments. Trends and perspectives using logger technology on penguins, Memoires of the National Institute of Polar Research Tokyo, 58, 34

10.1038/nature01767

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Functional Ecology

Tập 18 Số 6

793-801

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