Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1111/j.1365-2486.2012.02778.x |
The costs of keeping cool in a warming world: implications of high temperatures for foraging, thermoregulation and body condition of an arid-zone bird | |
du Plessis, Katherine L.1; Martin, Rowan O.1; Hockey, Philip A. R.1; Cunningham, Susan J.1; Ridley, Amanda R.1,2 | |
通讯作者 | Hockey, Philip A. R. |
来源期刊 | GLOBAL CHANGE BIOLOGY
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ISSN | 1354-1013 |
EISSN | 1365-2486 |
出版年 | 2012 |
卷号 | 18期号:10页码:3063-3070 |
英文摘要 | Recent mass mortalities of bats, birds and even humans highlight the substantial threats that rising global temperatures pose for endotherms. Although less dramatic, sublethal fitness costs of high temperatures may be considerable and result in changing population demographics. Endothermic animals exposed to high environmental temperatures can adjust their behaviour (e.g. reducing activity) or physiology (e.g. elevating rates of evaporative water loss) to maintain body temperatures within tolerable limits. The fitness consequences of these adjustments, in terms of the ability to balance water and energy budgets and therefore maintain body condition, are poorly known. We investigated the effects of daily maximum temperature on foraging and thermoregulatory behaviour as well as maintenance of body condition in a wild, habituated population of Southern Pied Babblers Turdoides bicolor. These birds inhabit a hot, arid area of southern Africa where they commonly experience environmental temperatures exceeding optimal body temperatures. Repeated measurements of individual behaviour and body mass were taken across days varying in maximum air temperature. Contrary to expectations, foraging effort was unaffected by daily maximum temperature. Foraging efficiency, however, was lower on hotter days and this was reflected in a drop in body mass on hotter days. When maximum air temperatures exceeded 35.5 degrees C, individuals no longer gained sufficient weight to counter typical overnight weight loss. This reduction in foraging efficiency is likely driven, in part, by a trade-off with the need to engage in heat-dissipation behaviours. When we controlled for temperature, individuals that actively dissipated heat while continuing to forage experienced a dramatic decrease in their foraging efficiency. This study demonstrates the value of investigations of temperature-dependent behaviour in the context of impacts on body condition, and suggests that increasingly high temperatures will have negative implications for the fitness of these arid-zone birds. |
英文关键词 | body condition body mass climate change daily maximum temperature foraging efficiency foraging effort Southern Pied Babbler temperature-dependent behaviour thermoregulation trade-offs Turdoides bicolor |
类型 | Article |
语种 | 英语 |
国家 | South Africa ; Australia |
收录类别 | SCI-E |
WOS记录号 | WOS:000308443800008 |
WOS关键词 | CLIMATE-CHANGE ; ENERGY MANAGEMENT ; DESERT ; MORTALITY ; CONSTRAINTS ; POPULATION ; ADAPTATION ; ROUTINES ; MONGOOSE ; EXTREMES |
WOS类目 | Biodiversity Conservation ; Ecology ; Environmental Sciences |
WOS研究方向 | Biodiversity & Conservation ; Environmental Sciences & Ecology |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/172658 |
作者单位 | 1.Univ Cape Town, DST NRF Ctr Excellence, Percy Fitzpatrick Inst African Ornithol, ZA-7701 Cape Town, South Africa; 2.Macquarie Univ, Dept Biol Sci, Sydney, NSW 2122, Australia |
推荐引用方式 GB/T 7714 | du Plessis, Katherine L.,Martin, Rowan O.,Hockey, Philip A. R.,et al. The costs of keeping cool in a warming world: implications of high temperatures for foraging, thermoregulation and body condition of an arid-zone bird[J],2012,18(10):3063-3070. |
APA | du Plessis, Katherine L.,Martin, Rowan O.,Hockey, Philip A. R.,Cunningham, Susan J.,&Ridley, Amanda R..(2012).The costs of keeping cool in a warming world: implications of high temperatures for foraging, thermoregulation and body condition of an arid-zone bird.GLOBAL CHANGE BIOLOGY,18(10),3063-3070. |
MLA | du Plessis, Katherine L.,et al."The costs of keeping cool in a warming world: implications of high temperatures for foraging, thermoregulation and body condition of an arid-zone bird".GLOBAL CHANGE BIOLOGY 18.10(2012):3063-3070. |
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