Saturday, November 23, 2019

Diurnal pattern of mass in an urban Marlborough population of silvereyes (Zosterops lateralis)

TitleDiurnal pattern of mass in an urban Marlborough population of silvereyes (Zosterops lateralis)
Publication TypeJournal Article
Year of Publication2010
AuthorsBell, M, Bell, C
JournalNotornis
Volume57
Issue3
Pagination148-151
Type of ArticleFull article
KeywordsDiurnal weight change, mass-dependent starvation risk, silvereye, Zosterops lateralis
Abstract

Silvereyes (Zosterops lateralis) in an urban population in Marlborough, New Zealand showed considerable diurnal changes in body mass. At first light, average mass was 12.39 g, rising to 13.91 g by dusk. This represented a 12% average loss of mass overnight. The overall average mass was 13.22 g; birds were 6% below average at 0700 h, but increased rapidly to be near the average for most of the day, rising significantly in the 2 hours before dusk (1700 h). This pattern of diurnal mass change is consistent with theoretical models suggesting that birds should manipulate daily mass gain in order to trade-off starvation risk with mass-dependent predation risk.

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