Document Detail


Birds bias offspring sex ratio in response to livestock grazing.
MedLine Citation:
PMID:  21561962     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Livestock grazing, which has a large influence on habitat structure, is associated with the widespread decline of various bird species across the world, yet there are few experimental studies that investigate how grazing pressure influences avian reproduction. We manipulated grazing pressure using a replicated field experiment, and found that the offspring sex ratio of a common upland passerine, the meadow pipit Anthus pratensis, varied significantly between grazing treatments. The proportion of sons was lowest in the ungrazed and intensively grazed treatments and highest in treatments grazed at low intensity (by sheep, or a mixture of sheep and cattle). This response was not related to maternal body condition. These results demonstrate the sensitivity of avian reproductive biology to variation in local conditions, and support growing evidence that too much grazing, or the complete removal of livestock from upland areas, is detrimental for common breeding birds.
Authors:
Gina L Prior; Darren M Evans; Stephen Redpath; Simon J Thirgood; Pat Monaghan
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2011-05-11
Journal Detail:
Title:  Biology letters     Volume:  7     ISSN:  1744-957X     ISO Abbreviation:  Biol. Lett.     Publication Date:  2011 Dec 
Date Detail:
Created Date:  2011-11-14     Completed Date:  2012-03-07     Revised Date:  2013-06-30    
Medline Journal Info:
Nlm Unique ID:  101247722     Medline TA:  Biol Lett     Country:  England    
Other Details:
Languages:  eng     Pagination:  958-60     Citation Subset:  IM    
Affiliation:
The Macaulay Land Use Research Institute (MLURI), Craigiebuckler, Aberdeen, UK. g.prior@macaulay.ac.uk
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MeSH Terms
Descriptor/Qualifier:
Animals
Cattle / physiology
Conservation of Natural Resources*
Ecosystem
Feeding Behavior
Female
Male
Reproduction*
Scotland
Seasons
Sex Ratio*
Sheep, Domestic / physiology
Songbirds / physiology*
Comments/Corrections

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