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Liu M, Swanson DL. Stress physiology of migrant birds during stopover in natural and anthropogenic woodland habitats of the Northern Prairie region. Conserv Physiol. 2014;2(1):cou046doi: 10.1093/conphys/cou046.
Liu, M., & Swanson, D. L. (2014). Stress physiology of migrant birds during stopover in natural and anthropogenic woodland habitats of the Northern Prairie region. Conservation physiology, 2(1), cou046. https://doi.org/10.1093/conphys/cou046
Liu, Ming, and Swanson, David L. "Stress physiology of migrant birds during stopover in natural and anthropogenic woodland habitats of the Northern Prairie region." Conservation physiology vol. 2,1 (2014): cou046. doi: https://doi.org/10.1093/conphys/cou046
Liu M, Swanson DL. Stress physiology of migrant birds during stopover in natural and anthropogenic woodland habitats of the Northern Prairie region. Conserv Physiol. 2014 Oct 11;2(1):cou046. doi: 10.1093/conphys/cou046. eCollection 2014. PMID: 27293667; PMCID: PMC4806743.
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Conserv Physiol. 2014 Oct 11;2(1):cou046. doi: 10.1093/conphys/cou046. eCollection 2014.

Stress physiology of migrant birds during stopover in natural and anthropogenic woodland habitats of the Northern Prairie region.

Conservation physiology

Ming Liu, David L Swanson

Affiliations

  1. Department of Biology, University of South Dakota, Vermillion, SD 57069, USA.

PMID: 27293667 PMCID: PMC4806743 DOI: 10.1093/conphys/cou046

Abstract

Anthropogenic alterations of woodland habitat may influence stopover biology, which in turn could alter the stress physiology of migratory landbirds. Woodland stopover habitats are scarce in the Northern Prairie region of North America and consist of native riparian corridor woodlands (corridors) and smaller, more isolated woodlots of anthropogenic origin around farmsteads (woodlots). Corridor habitats have been greatly reduced since the time of European settlement, but woodlot habitats have appeared over this same time period. In this study, we compared stopover biology and stress physiology of migratory landbirds using natural and anthropogenic woodland habitats. We first tested for differences between birds in the two habitats for baseline corticosterone (CORTB) and the magnitude of the stress response for individual species, taxonomic families and foraging guilds. Plasma corticosterone increased significantly for all bird groups in both habitats following 30 min of restraint stress (CORT30), and neither CORTB nor the magnitude of the stress response (CORT30 - CORTB) differed significantly between birds in the two habitats. Secondly, because CORTB levels are often elevated and CORT secretion following a stressor is often suppressed for birds in poor body condition, we hypothesized that woodland migrants with higher fattening rates would show reduced CORTB and a robust stress response. We tested this hypothesis by assessing the relationships between plasma corticosterone and plasma metabolites associated with refuelling. We found that CORTB was negatively associated and the magnitude of the stress response positively associated with plasma triglycerides (an indicator of fat deposition), with opposite patterns for corticosterone and plasma β-hydroxybutyrate (an indicator of fat catabolism). These data suggest that both corridor and woodlot habitats serve as effective stopover habitat and that the reduction of corridor habitat and increased reliance on anthropogenic woodlots is not detrimental to the stress physiology of migrants in a region with limited woodland habitats.

Keywords: Corticosterone; landbird migrants; migration; riparian habitat; stopover biology; stress response

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