Arid
DOI10.1111/aec.12007
Breeding cues in a wetland-dependent Australian passerine of the seasonally wet-dry tropics
Houston, Wayne A.
通讯作者Houston, Wayne A.
来源期刊AUSTRAL ECOLOGY
ISSN1442-9985
出版年2013
卷号38期号:6页码:617-626
英文摘要

The Capricorn yellow chat Epthianura crocea macgregori (Aves: Meliphagidae) occurs in the seasonal wet-dry tropics. This region, although coastal, is typified by highly variable annual rainfall. The Capricorn yellow chat breeds in wetlands, predominantly in the summer-autumn period, but has the capacity to breed in response to out-of-season rainfall events, consistent with an opportunistically breeding species. Most studies of breeding cues in passerines have been on species centred on temperate climates with predictable rainfall season, arid biomes with a highly variable rainfall quantity and season, and the relatively non-seasonal wet tropics. This study was focused on a species that occurs in an intermediate situation with a highly variable but summer dominant rainfall season. It aimed to identify which proximal cues are used by birds in such environments to prepare for breeding. Monthly observations at a breeding ground over a 45-month period were regressed against environmental and climatic variables. There was a significant positive relationship of chat abundance with average minimum monthly air temperature and the extent of inundation. Invertebrate food availability was also sampled. Cross-correlation with prior monthly rainfall showed that abundance of insects (Diptera, Hemiptera and Lepidoptera) and semi-aquatic invertebrates peaked 1-2 months following large rainfall events, coinciding with peaks in presence of dependent young of Capricorn yellow chats. Thus, the Capricorn yellow chat matches the model for arid-adapted birds in which seasonal cues (e.g. increasing day-length or temperature) in spring lead to breeding preparedness, but breeding only occurs in response to proximal factors such as rainfall. However, the Capricorn yellow chat differs in that breeding is delayed until rainfall is sufficient to inundate its wetland habitat and stimulate the production of food resources associated with the low vegetation and muddy margins of the temporarily flooded pools and channels; suggesting that inundation may be the most important breeding cue.


英文关键词arid-adapted tropical bird Capricorn yellow chat endangered species environmental cues rainfall variability wetland-associated
类型Article
语种英语
国家Australia
收录类别SCI-E
WOS记录号WOS:000323199500002
WOS关键词RAIN-FOREST BIRD ; FOOD CUES ; REPRODUCTION ; GRASSLAND ; BIOLOGY
WOS类目Ecology
WOS研究方向Environmental Sciences & Ecology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/176062
作者单位(1)Cent Queensland Univ, Ctr Environm Management, Rockhampton, Qld 4702, Australia
推荐引用方式
GB/T 7714
Houston, Wayne A.. Breeding cues in a wetland-dependent Australian passerine of the seasonally wet-dry tropics[J],2013,38(6):617-626.
APA Houston, Wayne A..(2013).Breeding cues in a wetland-dependent Australian passerine of the seasonally wet-dry tropics.AUSTRAL ECOLOGY,38(6),617-626.
MLA Houston, Wayne A.."Breeding cues in a wetland-dependent Australian passerine of the seasonally wet-dry tropics".AUSTRAL ECOLOGY 38.6(2013):617-626.
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