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Higher plasma corticosterone is associated with reduced costs of infection in red-winged blackbirds.

Abstract：

:Glucocorticoid hormones allow individuals to rapidly adjust their physiology and behavior to meet the challenges of a variable environment. An individual's baseline concentration of glucocorticoids can reflect shifts in life history stage and resource demands while mediating a suite of physiological and behavioral changes that include immune modulation and resource allocation. Thus, glucocorticoids could facilitate a response to parasites that is optimized for an individual's specific challenges and life history stage. We investigated the relationship between endogenous circulating glucocorticoids and measures of resistance and tolerance to Haemosporidian parasites (including those that cause avian malaria) in red-winged blackbirds (Agelaius phoeniceus). We found that higher endogenous concentrations of circulating glucocorticoids were associated with reduced costs of parasite infection, which is indicative of higher tolerance, but were unrelated to parasite burden in free ranging, breeding male birds. Post-breeding, both males and females with higher glucocorticoid concentrations had higher measures of tolerance to Haemosporidian infection. Our findings suggest a potentially adaptive role for glucocorticoids in shifting the response to parasites to align with an individual's current physiological state and the challenges they face.

journal_name

Gen Comp Endocrinol

journal_title

General and comparative endocrinology

authors

Schoenle LA,Schoepf I,Weinstein NM,Moore IT,Bonier F

doi

10.1016/j.ygcen.2017.07.006

subject

Has Abstract

pub_date

2018-01-15 00:00:00

pages

89-98

eissn

0016-6480

issn

1095-6840

pii

S0016-6480(17)30124-7

journal_volume

256

pub_type

杂志文章

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