Dataset Information

Stress hormone receptors change as range expansion progresses in house sparrows.

ABSTRACT: As ranges expand, individuals encounter different environments at the periphery than at the centre of the range. Previously, we have shown that glucocorticoids (GCs) vary with range expansion: individuals at the range edge release more GCs in response to restraint. Here, we measured hippocampal mRNA expression of GC receptors (mineralocorticoid, MR and glucocorticoid, GR) in eight house sparrow (Passer domesticus) populations varying in age. We found that individuals closest to the range edge had the lowest expression of MR relative to GR; in all likelihood, this relationship was driven by a marginal reduction of MR mRNA at the range edge. Reduced MR (relative to GR) might allow enhanced GC binding to GR, the lower affinity receptor that would enhance a rapid physiological and behavioural response to stressors. The insights gained from this study are not only enlightening to introduced species, but may also predict how certain species will react as their ranges shift owing to anthropogenic changes.

SUBMITTER: Liebl AL

PROVIDER: S-EPMC3645051 | biostudies-literature | 2013 Jun

REPOSITORIES: biostudies-literature

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Stress hormone receptors change as range expansion progresses in house sparrows.

Liebl Andrea L AL Martin Lynn B LB

Biology letters 20130410 3

As ranges expand, individuals encounter different environments at the periphery than at the centre of the range. Previously, we have shown that glucocorticoids (GCs) vary with range expansion: individuals at the range edge release more GCs in response to restraint. Here, we measured hippocampal mRNA expression of GC receptors (mineralocorticoid, MR and glucocorticoid, GR) in eight house sparrow (Passer domesticus) populations varying in age. We found that individuals closest to the range edge ha ...[more]

PMID: 23576781

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Dataset Information

Stress hormone receptors change as range expansion progresses in house sparrows.

Publications

Stress hormone receptors change as range expansion progresses in house sparrows.

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