Document Detail

Predators, alternative prey and climate influence annual breeding success of a long-lived sea duck.
MedLine Citation:
PMID:  23362924     Owner:  NLM     Status:  Publisher    
Perturbations to ecosystems have the potential to directly and indirectly affect species interactions, with subsequent impacts on population dynamics and the vital rates that regulate them. The few long-term studies of common eider breeding ecology indicate that reproductive success is low in most years, interrupted by occasional boom years. However, no study has explicitly examined the drivers of long-term variation in reproductive success. Here, we use encounter history data collected across 41 years to examine the effects of arctic foxes (a terrestrial nest predator), local abundance and spatial distribution of lesser snow geese (an alternative prey source), and spring climate on common eider nest success. Eider nest success declined over the course of the study, but was also highly variable across years. Our results supported the hypothesis that the long-term decline in eider nest success was caused by apparent competition with lesser snow geese, mediated by shared predators. This effect persisted even following a large-scale exodus of nesting geese from the eider colony. Nest success was also lowest in years of low arctic fox index, presumably driven by prey switching in years of low small mammal availability. However, increased snow goose abundance appeared to buffer this effect through prey swamping. The effect of spring climate depended on the stage of the breeding season; cold and wet and warm and dry conditions in early spring were correlated with decreased nest success, whereas warm and wet conditions in late spring increased eider nest success. These results underscore the significance of both trophic interactions and climate in regulating highly variable vital rates, which likely have important consequences for population dynamics and the conservation of long-lived iteroparous species.
David T Iles; Robert F Rockwell; Paul Matulonis; Gregory J Robertson; Kenneth F Abraham; J Chris Davies; David N Koons
Related Documents :
464234 - Incidental splenectomy: early and late postoperative complications.
19692564 - Differentiating culture samples representing coagulase-negative staphylococcal bacterem...
22189834 - Efficacy and tolerability of 5% minoxidil solution (carexidil®) in male and female and...
19015014 - No elevated genomic damage in children and adolescents with attention deficit/hyperacti...
9409124 - Macrodactyly of the feet and hands.
2040354 - Factors influencing the clinical response to surfactant replacement therapy in babies w...
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-1-31
Journal Detail:
Title:  The Journal of animal ecology     Volume:  -     ISSN:  1365-2656     ISO Abbreviation:  J Anim Ecol     Publication Date:  2013 Jan 
Date Detail:
Created Date:  2013-1-31     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0376574     Medline TA:  J Anim Ecol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
© 2013 The Authors. Journal of Animal Ecology © 2013 British Ecological Society.
Department of Wildland Resources and the Ecology Center, Utah State University, 5230 Old Main Hill, Logan, UT, 84322-5230, USA.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

Previous Document:  Biselectivity of isoDGR Peptides for Fibronectin Binding Integrin Subtypes ?5?1 and ?v?6: Conformati...
Next Document:  Endoscopic resection (endoscopic mucosal resection/ endoscopic submucosal dissection) for early gast...