干旱区生态环境知识资源中心(Arid): Top-down effects have primacy over bottom-up effects on the population dynamics of a flightless desert bird

Arid

DOI	10.1016/j.jaridenv.2021.104611
	Top-down effects have primacy over bottom-up effects on the population dynamics of a flightless desert bird
	Wijas, Baptiste; Letnic, Mike
通讯作者	Wijas, B (corresponding author), Univ New South Wales, Sydney, NSW 2052, Australia.
来源期刊	JOURNAL OF ARID ENVIRONMENTS
ISSN	0140-1963
EISSN	1095-922X
出版年	2021
卷号	195
英文摘要	In desert ecosystems, some argue that primary productivity controls vertebrate populations while others contend that predators' top-down effects are under-appreciated. While seldom used to explain population dynamics in desert environments, the exploitation ecosystems hypothesis (EEH) unites bottom-up and top-down processes by conceptualizing how the biomass of plants and consumers vary along spatial productivity gradients in the presence and absence of predators. Here, we test predictions from the EEH along temporal primary productivity gradients, by comparing abundances of an apex predator (dingo) and a large omnivorous flightless bird (emu) on either side of Australia's dingo-proof fence over a nine year period. Where dingo populations were not suppressed by humans, their abundance increased with rainfall in the previous 12 months but did not respond to rainfall where their populations were suppressed. Conversely, emu abundance increased in response to antecedent rainfall where dingoes were rare but showed a negligible response to rainfall where dingoes were common. Our results accord with the EEH by suggesting that dingoes' top-down effects can decouple the linkage between emu populations and primary productivity. More generally, our findings show that top-down effects can have primacy over bottom-up effects for both an apex predator and an omnivorous prey species.
英文关键词	Landscape ecology Top-down Bottom-up Arid Flightless bird EEH
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000697775400006
WOS关键词	EXPLOITATION ECOSYSTEMS ; TROPHIC CASCADES ; DROMAIUS-NOVAEHOLLANDIAE ; ACTIVITY PATTERNS ; RESOURCE PULSES ; ARID AUSTRALIA ; APEX PREDATOR ; FOOD WEBS ; DINGO ; RESPONSES
WOS类目	Ecology ; Environmental Sciences
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/2XILL650/363756
作者单位	[Wijas, Baptiste; Letnic, Mike] Univ New South Wales, Evolut & Ecol Res Ctr, Sydney, NSW 2052, Australia; [Wijas, Baptiste; Letnic, Mike] Univ New South Wales, Ctr Ecosyst Sci, Sydney, NSW 2052, Australia
推荐引用方式 GB/T 7714	Wijas, Baptiste,Letnic, Mike. Top-down effects have primacy over bottom-up effects on the population dynamics of a flightless desert bird[J],2021,195.
APA	Wijas, Baptiste,&Letnic, Mike.(2021).Top-down effects have primacy over bottom-up effects on the population dynamics of a flightless desert bird.JOURNAL OF ARID ENVIRONMENTS,195.
MLA	Wijas, Baptiste,et al."Top-down effects have primacy over bottom-up effects on the population dynamics of a flightless desert bird".JOURNAL OF ARID ENVIRONMENTS 195(2021).