Laysan Finch nest characteristics, nest spacing and reproductive success in two vegetation types
Article Abstract:
Laysan Finch (Telespiza cantans) nests made of bunchgrass (Eragrostis variabilis) and of viney (Ipomoea-Boerhavia-Sicyos vines) associations were compared. Bunchgrass nests were predominant and were constructed differently, but clutch size and fledging success did not differ significantly. Active viney nests were more closely aggregated and appeared to be more productive per unit area for nesting. The effects of the proliferation of the non-native bush Pluchea indica has to be studied, as it may undermine the populations of the two plant associations and upset the nesting habitat of Laysan Finches.
Publication Name: The Condor
Subject: Biological sciences
ISSN: 0010-5422
Year: 1992
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The breeding biology of an endangered Hawaiian honeycreeper, the Laysan Finch
Article Abstract:
A field study was conducted to examine the breeding biology of the Laysan Finch (Telespiza cantans), an endangered Hawaiian honeycreeper. A total of 1,106 finches were observed on Laysan Island in Hawaii from 1986 to 1988. Laysan Finches were found to exhibit high mate fidelity. Weather conditions affected breeding success. In poor years, three-egg clutches, which was found to be the average, were found to have higher breeding success than larger clutches. In good years, on the other hand, four-egg clutches performed better.
Publication Name: The Condor
Subject: Biological sciences
ISSN: 0010-5422
Year: 1992
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Avian nest success in relation to past grazing regimes in a montane riparian system
Article Abstract:
The impact of livestock grazing on bird population is explored by studying vegetational variations in a montane riparian ecosystem. One side of the community has been regularly summer-grazed while the other has been excluded from grazing for 30 years. Findings prove that livestock grazing may affect availability of nesting substrates for riparian birds since it destroys streamside vegetation. It could also affect bird populations by engendering nest predication.
Publication Name: The Condor
Subject: Biological sciences
ISSN: 0010-5422
Year: 1997
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