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Seasonal Trophic Niche Shift and Cascading Effect of a Generalist Predator Fish
Xu, Jun1; Wen, Zhourui2; Gong, Zhijun3; Zhang, Min4; Xie, Ping1; Hansson, Lars-Anders5; 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.
2012-12-14
Source PublicationPLOS ONE
ISSN1932-6203
Volume7Issue:12Pages:e49691
AbstractFew 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; 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
SubtypeArticle
KeywordStable-isotopes Shallow Lakes Community Structure Ontogenic Niche Temporal Scales Marine Predator Prey Dynamics Food Webs Body-size Zooplankton
Department[Xu, Jun ; Xie, Ping] Chinese Acad Sci, Inst Hydrobiol, State Key Lab Freshwater Ecol & Biotechnol China, Donghu Expt Stn Lake Ecosyst, Wuhan, Hubei, Peoples R China ; [Wen, Zhourui] Hubei Fishery Sci Inst, Wuhan, Hubei, Peoples R China ; [Gong, Zhijun] Chinese Acad Sci, Nanjing Inst Geog & Limnol, Nanjing, Jiangsu, Peoples R China ; [Zhang, Min] Huazhong Agr Univ, Coll Fisheries, Wuhan, Hubei, Peoples R China ; [Hansson, Lars-Anders] Lund Univ, Inst Biol Aquat Ecol, Lund, Sweden
DOI10.1371/journal.pone.0049691
WOS HeadingsScience & Technology
Funding OrganizationNational 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] ; 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] ; 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] ; 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]
Indexed BySCI
Language英语
WOS Research AreaScience & Technology - Other Topics
WOS SubjectMultidisciplinary Sciences
WOS IDWOS:000312386800006
WOS KeywordSTABLE-ISOTOPES ; SHALLOW LAKES ; COMMUNITY STRUCTURE ; ONTOGENIC NICHE ; TEMPORAL SCALES ; MARINE PREDATOR ; PREY DYNAMICS ; FOOD WEBS ; BODY-SIZE ; ZOOPLANKTON
Funding OrganizationNational 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] ; 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] ; 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] ; 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]
Citation statistics
Cited Times:8[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ihb.ac.cn/handle/342005/19300
Collection淡水生态学研究中心_期刊论文
Corresponding AuthorXu, 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.
Affiliation1.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
Recommended Citation
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.,...&Xu, J .(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.
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