Population regulation in Magellanic penguins: what determines changes in colony size?

PloS One
Luciana M PozziMiguel A Pascual

Abstract

Seabirds are often studied at individual colonies, but the confounding effects of emigration and mortality processes in open populations may lead to inappropriate conclusions on the mechanisms underlying population changes. Magellanic penguin (Spheniscus magellanicus) colonies of variable population sizes are distributed along the Argentine coastline. In recent decades, several population and distributional changes have occurred, with some colonies declining and others newly established or increasing. We integrated data of eight colonies scattered along ∼600 km in Northern Patagonia (from 41°26´S, 65°01´W to 45°11´S, 66°30´W, Rio Negro and Chubut provinces) and conducted analysis in terms of their growth rates, production of young and of the dependence of those vital rates on colony age, size, and location. We contrasted population trends estimated from abundance data with those derived from population modeling to understand if observed growth rates were attainable under closed population scenarios. Population trends were inversely related to colony size, suggesting a density dependent growth pattern. All colonies located in the north--which were established during the last decades--increased at high rates, with the smallest, r...Continue Reading

References

Jan 4, 2001·Journal of Dentistry·J JantaratH H Messer
May 23, 2001·Archives of Biochemistry and Biophysics·N R BrandtA H Caswell
Oct 17, 2003·Proceedings. Biological Sciences·Christophe Barbraud, Henri Weimerskirch
Dec 1, 1996·Trends in Ecology & Evolution·W D KoenigP N Hooge
Jun 8, 2013·Science·Ewan D WakefieldKeith C Hamer
Feb 4, 2014·PloS One·P Dee Boersma, Ginger A Rebstock

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Citations

Jan 3, 2019·Ecological Applications : a Publication of the Ecological Society of America·N J Gownaris, P D Boersma
Jul 2, 2019·Conservation Biology : the Journal of the Society for Conservation Biology·P D BoersmaB Wienecke
May 26, 2020·BMC Veterinary Research·Ana Carolina EwbankJosé Luiz Catão-Dias

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Software Mentioned

gplots
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popbio
Ped
chron
QGis
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Tom
lme4
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