Document Detail


Linking snake habitat use to nest predation risk in grassland birds: the dangers of shrub cover.
MedLine Citation:
PMID:  20052494     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Extremes in rangeland management, varying from too-frequent fire and intensive grazing to the suppression of both, threaten rangeland ecosystems worldwide. Intensive fire and grazing denude and homogenize vegetation whereas their suppression increases woody cover. Although habitat loss is implicated in grassland bird declines, degradation through intensive management or neglect also decreases breeding habitat and may reduce nesting success through increased rates of nest predation. Snakes are important nest predators, but little is known about how habitat use in snakes relates to predation risk for grassland birds nesting within tallgrass prairie subjected to different grazing and fire frequencies. We evaluated nest survival in the context of habitat used by nesting songbirds and two bird-eating snakes, the eastern yellowbelly racer Coluber constrictor flaviventris and Great Plains ratsnake Pantherophis emoryi. Daily nest survival rates decreased with increasing shrub cover and decreasing vegetation height, which characterize grasslands that have been neglected or intensively managed, respectively. Discriminant function analysis revealed that snake habitats were characterized by higher shrub cover, whereas successful nests were more likely to occur in areas with tall grass and forbs but reduced shrub cover. Because snakes often use shrub habitat, birds nesting in areas with increased shrub cover may be at higher risk of nest predation by snakes in addition to other predators known to use shrub habitat (e.g., mid-sized carnivores and avian predators). Depredated nests also occurred outside the discriminant space of the snakes, indicating that other predators (e.g., ground squirrels Spermophilus spp. and bullsnakes Pituophis catenifer) may be important in areas with denuded cover. Targeted removal of shrubs may increase nest success by minimizing the activity of nest predators attracted to shrub cover.
Authors:
Page E Klug; Sara L Jackrel; Kimberly A With
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2010-01-06
Journal Detail:
Title:  Oecologia     Volume:  162     ISSN:  1432-1939     ISO Abbreviation:  Oecologia     Publication Date:  2010 Mar 
Date Detail:
Created Date:  2010-02-15     Completed Date:  2010-06-01     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0150372     Medline TA:  Oecologia     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  803-13     Citation Subset:  IM    
Affiliation:
Division of Biology, Kansas State University, Manhattan, KS 66506-4901, USA. pklug@ksu.edu
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MeSH Terms
Descriptor/Qualifier:
Animals
Birds*
Predatory Behavior*
Snakes / physiology*

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


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