Seasonal Trophic Niche Shift and Cascading Effect of a Generalist Predator Fish

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	Seasonal Trophic Niche Shift and Cascading Effect of a Generalist Predator Fish
	Xu, Jun 1; Wen, Zhourui 2; Gong, Zhijun 3; Zhang, Min 4; Xie, Ping 1; Hansson, Lars-Anders 5
刊名	PLOS ONE
	2012-12-14
卷号	7 期号:12 页码:e49691
关键词	STABLE-ISOTOPES SHALLOW LAKES COMMUNITY STRUCTURE ONTOGENIC NICHE TEMPORAL SCALES MARINE PREDATOR PREY DYNAMICS FOOD WEBS BODY-SIZE ZOOPLANKTON
ISSN号	1932-6203
通讯作者	Xu, J (reprint author), Chinese Acad Sci, Inst Hydrobiol, State Key Lab Freshwater Ecol & Biotechnol China, Donghu Expt Stn Lake Ecosyst, Wuhan, Hubei, Peoples R China.
中文摘要	Few studies have examined how foraging niche shift of a predator over time cascade down to local prey communities. Here we examine patterns of temporal foraging niche shifts of a generalist predator (yellow catfish, Pelteobagrus fulvidraco) and the abundance of prey communities in a subtropical lake. We predicted that the nature of these interactions would have implications for patterns in diet shifts and growth of the predator. Our results show significant decreases in planktivory and benthivory from late spring to summer and autumn, whereas piscivory increased significantly from mid-summer until late autumn and also increased steadily with predator body length. The temporal dynamics in predator/prey ratios indicate that the predation pressure on zooplankton and zoobenthos decreased when the predation pressure on the prey fish and shrimps was high. Yellow catfish adjusted their foraging strategies to temporal changes in food availability, which is in agreement with optimal foraging theory. Meanwhile the decrease in planktivory and benthivory of yellow catfish enabled primary consumers, such as zooplankton and benthic invertebrates, to develop under low grazing pressure via trophic cascading effects in the local food web. Thus, yellow catfish shifts its foraging niche to intermediate consumers in the food web to benefit the energetic demand on growth and reproduction during summer, which in turn indirectly facilitate the primary consumers. In complex food webs, trophic interactions are usually expected to reduce the strength and penetrance of trophic cascades. However, our study demonstrates strong associations between foraging niche of piscivorous fish and abundance of prey. This relationship appeared to be an important factor in producing top-down effects on both benthic and planktonic food webs. Citation: Xu J, Wen Z, Gong Z, Zhang M, Xie P, et al. (2012) Seasonal Trophic Niche Shift and Cascading Effect of a Generalist Predator Fish. PLoS ONE 7(12): e49691. doi:10.1371/journal.pone.0049691
英文摘要	Few studies have examined how foraging niche shift of a predator over time cascade down to local prey communities. Here we examine patterns of temporal foraging niche shifts of a generalist predator (yellow catfish, Pelteobagrus fulvidraco) and the abundance of prey communities in a subtropical lake. We predicted that the nature of these interactions would have implications for patterns in diet shifts and growth of the predator. Our results show significant decreases in planktivory and benthivory from late spring to summer and autumn, whereas piscivory increased significantly from mid-summer until late autumn and also increased steadily with predator body length. The temporal dynamics in predator/prey ratios indicate that the predation pressure on zooplankton and zoobenthos decreased when the predation pressure on the prey fish and shrimps was high. Yellow catfish adjusted their foraging strategies to temporal changes in food availability, which is in agreement with optimal foraging theory. Meanwhile the decrease in planktivory and benthivory of yellow catfish enabled primary consumers, such as zooplankton and benthic invertebrates, to develop under low grazing pressure via trophic cascading effects in the local food web. Thus, yellow catfish shifts its foraging niche to intermediate consumers in the food web to benefit the energetic demand on growth and reproduction during summer, which in turn indirectly facilitate the primary consumers. In complex food webs, trophic interactions are usually expected to reduce the strength and penetrance of trophic cascades. However, our study demonstrates strong associations between foraging niche of piscivorous fish and abundance of prey. This relationship appeared to be an important factor in producing top-down effects on both benthic and planktonic food webs. Citation: Xu J, Wen Z, Gong Z, Zhang M, Xie P, et al. (2012) Seasonal Trophic Niche Shift and Cascading Effect of a Generalist Predator Fish. PLoS ONE 7(12): e49691. doi:10.1371/journal.pone.0049691
WOS标题词	Science & Technology
类目[WOS]	Multidisciplinary Sciences
研究领域[WOS]	Science & Technology - Other Topics
关键词[WOS]	STABLE-ISOTOPES ; SHALLOW LAKES ; COMMUNITY STRUCTURE ; ONTOGENIC NICHE ; TEMPORAL SCALES ; MARINE PREDATOR ; PREY DYNAMICS ; FOOD WEBS ; BODY-SIZE ; ZOOPLANKTON
收录类别	SCI
资助信息	National Natural Science Foundation of China [31170439]; National Basic Research Program of China [2008CB418001-1]; Ministry of Science and Technology of the People's Republic of China [2007BAC26B02]
语种	英语
WOS记录号	WOS:000312386800006
公开日期	2013-10-31
内容类型	期刊论文
源URL	[http://ir.ihb.ac.cn/handle/342005/19300]
专题	水生生物研究所_淡水生态学研究中心_期刊论文
作者单位	1.Chinese Acad Sci, Inst Hydrobiol, State Key Lab Freshwater Ecol & Biotechnol China, Donghu Expt Stn Lake Ecosyst, Wuhan, Hubei, Peoples R China 2.Hubei Fishery Sci Inst, Wuhan, Hubei, Peoples R China 3.Chinese Acad Sci, Nanjing Inst Geog & Limnol, Nanjing, Jiangsu, Peoples R China 4.Huazhong Agr Univ, Coll Fisheries, Wuhan, Hubei, Peoples R China 5.Lund Univ, Inst Biol Aquat Ecol, Lund, Sweden
推荐引用方式 GB/T 7714	Xu, Jun,Wen, Zhourui,Gong, Zhijun,et al. Seasonal Trophic Niche Shift and Cascading Effect of a Generalist Predator Fish[J]. PLOS ONE,2012,7(12):e49691.
APA	Xu, Jun,Wen, Zhourui,Gong, Zhijun,Zhang, Min,Xie, Ping,&Hansson, Lars-Anders.(2012).Seasonal Trophic Niche Shift and Cascading Effect of a Generalist Predator Fish.PLOS ONE,7(12),e49691.
MLA	Xu, Jun,et al."Seasonal Trophic Niche Shift and Cascading Effect of a Generalist Predator Fish".PLOS ONE 7.12(2012):e49691.