Friday, November 22, 2019

Changes in egg size of exotic passerines introduced to New Zealand

TitleChanges in egg size of exotic passerines introduced to New Zealand
Publication TypeJournal Article
Year of Publication2005
AuthorsCassey, P, Blackburn, TM, Evans, KL
JournalNotornis
Volume52
Issue4
Pagination243-246
Type of Articlepaper
KeywordsAshmole's hypothesis, clutch volume, egg size, introduced birds, reproductive effort
Abstract

Bird species introduced to New Zealand from high northern latitudes are expected to change their breeding behaviour to conform to well-known geographic gradients in avian reproductive parameters. Here, we demonstrate reductions in average egg size and clutch volume for eight species of exotic passerine originating in the UK, and show that the magnitudes of these reductions appear to trade-off against reductions in annual variation in clutch size. Possible reasons for the trade-off are discussed.

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