Habitat complexity and management intensity positively influence fledging success in the endangered hihi (Notiomystis cincta)

Age and structure of local vegetation (habitat complexity) are commonly assumed to be indicators of habitat quality for breeding birds, but for many species these relationships are poorly understood. The hihi (stitchbird Notiomystis cincta), an endangered New Zealand cavity-nesting passerine that on...

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Veröffentlicht in:	New Zealand Journal of Ecology. - New Zealand Ecological Society. - 38(2014), 1, Seite 53-63
1. Verfasser:	Makan, Troy (VerfasserIn)
Weitere Verfasser:	Castro, Isabel, Robertson, Alastair W., Joy, Michael K., Low, Matthew
Format:	Online-Aufsatz
Sprache:	English
Veröffentlicht:	2014
Zugriff auf das übergeordnete Werk:	New Zealand Journal of Ecology
Schlagworte:	Biological sciences Behavioral sciences Physical sciences Social sciences


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245	1	0	\|a Habitat complexity and management intensity positively influence fledging success in the endangered hihi (Notiomystis cincta)
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520			\|a Age and structure of local vegetation (habitat complexity) are commonly assumed to be indicators of habitat quality for breeding birds, but for many species these relationships are poorly understood. The hihi (stitchbird Notiomystis cincta), an endangered New Zealand cavity-nesting passerine that only survives on mammalian predator-free islands or within fenced areas, has been the focus of intensive conservation management and research. Between 1992 and 2004 we examined the fledging success of 347 nests from four island populations. Habitat quality was improved at the two scrub/regenerating sites and one of the two mature/climax sites through management using supplementary feeding, nest-box parasite control or both. At two sites (one mature, one regenerating) management was stopped during the study allowing us to measure fledgling success with and without habitat quality improvement through management. At the population level, the number of chicks fledged per nest increased as management intensity increased and habitat quality increased. The positive effect of management was greatest for populations in lower quality habitats. To assess the relationship between fledging success and local habitat variables around the nesting site we used a height-frequency vegetation survey method sensitive to changes in vertical structural complexity at the two mature/climax sites. For 36 natural nests, a cross-validated regression-tree analysis (R2 = 0.69) predicted that as habitat complexity increased, so did fledging success, which was generally higher for nests in trees with larger diameters (present in older forests). Because these habitats are free from nest predators, our results suggest that habitat age and complexity are proxies for habitat quality through effects on nestling food availability and/or nest-chamber characteristics. Our results support the current management approach of providing supplementary food to translocated hihi populations and suggest that supplementary food can be used to overcome resource deficiencies for this species in poorer quality habitats.
540			\|a Copyright © New Zealand Ecological Society (Inc.)
650		4	\|a Biological sciences \|x Biology \|x Botany \|x Plant ecology \|x Forest ecology \|x Forest ecosystems \|x Forest habitats
650		4	\|a Biological sciences \|x Biology \|x Conservation biology \|x Conservation agriculture \|x Habitat conservation
650		4	\|a Behavioral sciences \|x Ethology \|x Animal behavior \|x Habitat selection \|x Animal nesting \|x Bird nesting
650		4	\|a Behavioral sciences \|x Ethology \|x Animal behavior \|x Habitat selection \|x Animal nesting
650		4	\|a Physical sciences \|x Earth sciences \|x Geography \|x Geomorphology \|x Landforms \|x Coastal landforms \|x Coastal barriers \|x Barrier islands
650		4	\|a Social sciences \|x Food studies \|x Food economics \|x Food supply
650		4	\|a Biological sciences \|x Ecology \|x Population ecology \|x Synecology \|x Habitats
650		4	\|a Biological sciences \|x Ecology \|x Wildlife ecology \|x Wildlife habitats
650		4	\|a Biological sciences \|x Biology \|x Conservation biology \|x Environmental conservation
650		4	\|a Biological sciences \|x Biology \|x Evolutionary studies \|x Evolutionary biology \|x Evolutionary genetics \|x Reproductive success
655		4	\|a research-article
700	1		\|a Castro, Isabel \|e verfasserin \|4 aut
700	1		\|a Robertson, Alastair W. \|e verfasserin \|4 aut
700	1		\|a Joy, Michael K. \|e verfasserin \|4 aut
700	1		\|a Low, Matthew \|e verfasserin \|4 aut
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773	1	8	\|g volume:38 \|g year:2014 \|g number:1 \|g pages:53-63
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