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Wintering French mallard and teal are heavier and in better body condition than 30 years ago: effects of a changing environment?
Office National de la Chasse et de la Faune Sauvage, CNERA Avifaune Migratrice La Tour du Valat, Le Sambuc, Arles.
Högskolan Kristianstad, Sektionen för lärande och miljö, Avdelningen för Naturvetenskap. Högskolan Kristianstad, Forskningsmiljön Man and Biosphere Health (MABH).
Centre de Recherche de la Tour du Valat Le Sambuc, Arles.
Les Marais du Vigueirat Mas Thibert, Arles .
Vise andre og tillknytning
2010 (engelsk)Inngår i: Ambio, ISSN 0044-7447, E-ISSN 1654-7209, Vol. 39, nr 2, s. 170-180Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Animal populations are exposed to large-scale anthropogenic impact from e.g. climate change, habitat alteration and supplemental stocking. All of these may affect body condition in wintering dabbling ducks, which in turn may affect an individual's survival and reproductive success. The aim of this study was to assess whether there have been morphometric changes in Mallard (Anas platyrhynchos) and Teal (Anas crecca) over the last 30 years at a major wintering site. Body mass and condition increased from the 1950s-1960s to the 2000s in both species. The increase in body mass amounted to as much as 11.7%, with no corresponding change in body size. Improved body condition was maintained from early to mid-winter, but then converged with historical values for late winter. Our interpretation is that increasingly benign ambient winter conditions permit ducks to maintain better energetic "safety margins" throughout winter, and that converging spring departure values may be related to evolutionary flight energetic optima. The observed changes are consistent with large-scale climate amelioration and local/regional habitat improvement (both anthropogenic).

sted, utgiver, år, opplag, sider
2010. Vol. 39, nr 2, s. 170-180
Emneord [en]
Wing length, Body mass, Body condition, Anas crecca, Anas, platyrhynchos, Climate change, Habitat change, geese branta-leucopsis, recent climate-change, anas-crecca, passerine, birds, dabbling ducks, size, camargue, consequences, hypothesis, waterfowl
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URN: urn:nbn:se:hkr:diva-7522DOI: 10.1007/s13280-010-0020-9ISI: 000278679900008PubMedID: 20653279OAI: oai:DiVA.org:hkr-7522DiVA, id: diva2:380518
Tilgjengelig fra: 2010-12-21 Laget: 2010-12-20 Sist oppdatert: 2017-12-11bibliografisk kontrollert

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