globalchange  > 气候变化事实与影响
DOI: 10.1007/s00442-019-04343-x
WOS ID: WOS:000461360700015
Title:
Drought alters the trophic role of an opportunistic generalist in an aquatic ecosystem
Author: Amundrud, Sarah L.; Clay-Smith, Sarina A.; Flynn, Bret L.; Higgins, Kathleen E.; Reich, Megan S.; Wiens, Derek R. H.; Srivastava, Diane S.
Corresponding Author: Amundrud, Sarah L.
Source Publication: OECOLOGIA
ISSN: 0029-8549
EISSN: 1432-1939
Publishing Year: 2019
Volume: 189, Issue:3, Pages:733-744
Language: 英语
Keyword: Insects ; Microcosm experiment ; Precipitation ; Tank bromeliad ; Trophic plasticity
WOS Keyword: FOOD WEBS ; SPECIES INTERACTIONS ; TEMPERATURE-DEPENDENCE ; INTERACTION STRENGTH ; CLIMATE-CHANGE ; PREDATION ; RESPONSES ; DIPTERA ; WATER ; BEHAVIOR
WOS Category: Ecology
WOS Research Area: Environmental Sciences & Ecology
English Abstract:

Abiotic change can alter species interactions by modifying species' trophic roles, but this has not been well studied. Until now, bromeliad-dwelling tipulid larvae were thought to positively affect other macroinvertebrates via a facilitative processing chain. However, under drought, we found the opposite. We performed two microcosm experiments in which we factorially manipulated water level and predation by tipulids, and measured the effects on mosquito and chironomid larvae. The experiments differed in whether high water was contrasted with low or no water, allowing us to distinguish between the effects of desiccation stress (no water) and increased encounter rates due to compression of habitat or reductions in prey mobility (low and no water). We also included a caged tipulid treatment to measure any non-consumptive effects. As well as directly reducing prey survival, reductions in water level indirectly decreased chironomid and mosquito survival by altering the trophic role of tipulids. Our results suggest that increased encounter rates with prey led to tipulids becoming predatory under simulated drought, as tipulids consumed prey under both low and no water. When water level was high, tipulids exerted negative non-consumptive effects on prey survival. Because opportunistic predators are common throughout aquatic ecosystems, the effects of drought on the trophic roles of species may be widespread. Such restructuring of food webs should be considered when attempting to predict the ecological effects of environmental change.


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被引频次[WOS]:1   [查看WOS记录]     [查看WOS中相关记录]
Document Type: 期刊论文
Identifier: http://119.78.100.158/handle/2HF3EXSE/131501
Appears in Collections:气候变化事实与影响

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Affiliation: Univ British Columbia, Dept Zool, Biodivers Res Ctr, 6270 Univ Blvd, Vancouver, BC V6T 1Z4, Canada

Recommended Citation:
Amundrud, Sarah L.,Clay-Smith, Sarina A.,Flynn, Bret L.,et al. Drought alters the trophic role of an opportunistic generalist in an aquatic ecosystem[J]. OECOLOGIA,2019-01-01,189(3):733-744
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