title: Adverse foraging conditions may impact body mass and survival of a high Arctic seabird.
abstract: Tradeoffs between current reproduction and future survival are widely recognized, but may only occur when food is limited: when foraging conditions are favorable, parents may be able to reproduce without compromising their own survival. We investigated these tradeoffs in the little auk (Alle alle), a small seabird with a single-egg clutch. During 2005-2007, we examined the relationship between body mass and survival of birds breeding under contrasting foraging conditions at two Arctic colonies. We used corticosterone levels of breeding adults as a physiological indicator of the foraging conditions they encountered during each reproductive season. We found that when foraging conditions were relatively poor (as reflected in elevated levels of corticosterone), parents ended the reproductive season with low body mass and suffered increased post-breeding mortality. A positive relationship between body mass and post-breeding survival was found in one study year; light birds incurred higher survival costs than heavy birds. The results of this study suggest that reproducing under poor foraging conditions may affect the post-breeding survival of long-lived little auks. They also have important demographic implications because even a small change in adult survival may have a large effect on populations of long-lived species.
authors: Environmental Science Department, Alaska Pacific University, Anchorage, AK 99508, USA. aharding@usgs.gov
authors: Ann M A
authors: AM
authors: Harding
authors: Jorg
authors: J
authors: Welcker
authors: Harald
authors: H
authors: Steen
authors: Keith C
authors: KC
authors: Hamer
authors: Alexander S
authors: AS
authors: Kitaysky
authors: Jérôme
authors: J
authors: Fort
authors: Sandra L
authors: SL
authors: Talbot
authors: Leslie A
authors: LA
authors: Cornick
authors: Nina J
authors: NJ
authors: Karnovsky
authors: Geir W
authors: GW
authors: Gabrielsen
authors: David
authors: D
authors: Grémillet
mesh_terms: D000818:Animals; D000831:Animals, Newborn; D001070:Appetitive Behavior; D001835:Body Weight; D046091:Charadriiformes / Q000502:physiology*; D003345:Corticosterone / Q000097:blood; D004032:Diet; D017753:Ecosystem; D005260:Female; D006116:Greenland; D008297:Male; D044342:Malnutrition; D012098:Reproduction; D013312:Stress, Physiological; D013538:Svalbard
chemical_list: D003345:Corticosterone