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The stress hormone corticosterone in a marine top predatorreflects short-term changes in food availability

Barrett, Robert; Erikstad, Kjell E; Sandvik, Hanno; Myksvoll, Mari Skuggedal; Jenni-Eiermann, Susi; Kristensen, Ditte Lyngbo; Moum, Truls; Reiertsen, Tone; Vikebø, Frode Bendiksen
Journal article, Peer reviewed
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Erikstad+The+stress+hormone+Ecology+and+Evolution+2015.pdf (1.081Mb)
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http://hdl.handle.net/11250/280196
Utgivelsesdato
2015
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  • Institutt for biologi [2005]
  • Publikasjoner fra CRIStin - NTNU [26751]
Originalversjon
Ecology and Evolution 2015   10.1002/ece3.1438
Sammendrag
In many seabird studies, single annual proxies of prey abundance have been

used to explain variability in breeding performance, but much more important

is probably the timing of prey availability relative to the breeding season when

energy demand is at a maximum. Until now, intraseasonal variation in prey

availability has been difficult to quantify in seabirds. Using a state-of-the-art

ocean drift model of larval cod Gadus morhua, an important constituent of the

diet of common guillemots Uria aalge in the southwestern Barents Sea, we were

able to show clear, short-term correlations between food availability and measurements

of the stress hormone corticosterone (CORT) in parental guillemots

over a 3-year period (2009–2011). The model allowed the extraction of abundance

and size of cod larvae with very high spatial (4 km) and temporal resolutions

(1 day) and showed that cod larvae from adjacent northern spawning

grounds in Norway were always available near the guillemot breeding colony

while those from more distant southerly spawning grounds were less frequent,

but larger. The latter arrived in waves whose magnitude and timing, and thus

overlap with the guillemot breeding season, varied between years. CORT levels

in adult guillemots were lower in birds caught after a week with high frequencies

of southern cod larvae. This pattern was restricted to the two years (2009

and 2010) in which southern larvae arrived before the end of the guillemot

breeding season. Any such pattern was masked in 2011 by already exceptionally

high numbers of cod larvae in the region throughout chick-rearing period. The

findings suggest that CORT levels in breeding birds increase when the arrival of

southern sizable larvae does not match the period of peak energy requirements

during breeding.

Common guillemot, CORT, food availability,

seabird, Uria aalge
Tidsskrift
Ecology and Evolution

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