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Heritability of corticosterone response and changes in life history traits during selection in the zebra finch.

Abstract：

:Vertebrates respond to environmental stressors through the neuro-endocrine stress response, which involves the production of glucocorticoids. We have selected independent, duplicate divergent lines of zebra finches for high, low and control corticosterone responses to a mild stressor. This experiment has shown that over the first four generations, the high lines have demonstrated a significant realized heritability of about 20%. However, the low lines have apparently not changed significantly from controls. This asymmetry in response is potentially because of the fact that all birds appear to be showing increased adaptation to the environment in which they are housed, with significant declines in corticosterone response in control lines as well as low lines. Despite the existence of two- to threefold difference in mean corticosterone titre between high and low lines, there were no observed differences in testosterone titre in adult male birds from the different groups. In addition, there were no consistent, significant differences between the lines in any of the life history variables measured--number of eggs laid per clutch, number of clutches or broods produced per pair, number of fledglings produced per breeding attempt, nor in any of egg, nestling and fledgling mortality. These results highlight the fact that the mechanisms that underlie variation in the avian physiological system can be modified to respond to differences between environments through selection. This adds an additional level of flexibility to the avian physiological system, which will allow it to respond to environmental circumstances.

journal_name

J Evol Biol

journal_title

Journal of evolutionary biology

authors

Evans MR,Roberts ML,Buchanan KL,Goldsmith AR

doi

10.1111/j.1420-9101.2005.01034.x

subject

Has Abstract

pub_date

2006-03-01 00:00:00

pages

343-52

issue

2

eissn

1010-061X

issn

1420-9101

pii

JEB1034

journal_volume

19

pub_type

杂志文章

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