Size-related shifts in reliance on benthic and pelagic food webs by lake anchovy

CORC > 水生生物研究所 > 中科院水生所知识产出（2009年前） > 期刊论文

	Size-related shifts in reliance on benthic and pelagic food webs by lake anchovy
	Xu, Jun ; Zhang, Min ; Xie, Ping
刊名	ECOSCIENCE
	2007
卷号	14 期号:2 页码:170-177
关键词	benthic and pelagic food webs lake anchovy size-related diet shift stable isotopes
ISSN号	1195-6860
通讯作者	Xie, P, Chinese Acad Sci, Inst Hydrobiol, State Key Lab Freshwater Ecol & Biotechnol, Donghu Expt Stn Lake Ecosyst, Wuhan 430047, Peoples R China
中文摘要	This paper reports large variations in stable carbon and nitrogen isotope ratios of lake anchovy (Coilia ectenes taihuensis) from Lake Chaohu, China. The lake anchovy exhibited a significant C-13- and N-15- enrichment in relation to increasing fish length, and the isotopic compositions of small lake anchovy (<= 130 mm) were significantly more enriched than those of large lake anchovy (> 130 mm). The significant differences in the isotopic compositions of small and large lake anchovy suggested that their assimilated diets differed over a period of time and reflected the size-related diet shift of this fish. Bellamya aeruginosa and Corbicula fluminea were used to establish the baseline carbon signal of benthic and pelagic food webs, and these data were used to parameterize a 2-source mixing model to estimate in consumers the contribution of carbon derived from benthic versus pelagic food webs. Mixing models showed that small lake anchovy derived only 37% of their carbon from benthic food web, indicating increased reliance on pelagic prey, whereas benthic prey contributed 71% of large lake anchovy diet, suggesting greater use of benthic sources. These data indicate that there was a change in lake anchovy feeding strategy related to their size, suggesting a role in dynamic coupling between pelagic and benthic food chains. The trophic position of small lake anchovy averaged 3.0, indicating a zooplankton-based diet, compared with 3.6 in large lake anchovy, indicative of an increase in piscivorous diet. Overlap in the isotopic compositions of small and large lake anchovy probably indicated that these fish occasionally shared common diets, as suggested by stomach content studies, and/or resulted from the differences in the rate of isotopic turnover depending on differences in growth rate and metabolic turnover between small and large anchovy during diet shift from pelagic to benthic food webs. This study presents the contributions of benthic and pelagic food webs supporting lake anchovy and indicates that the intraspecific isotopic dynamic should be considered when applying stable isotope analyses to infer trophic interactions in aquatic ecosystems.
英文摘要	This paper reports large variations in stable carbon and nitrogen isotope ratios of lake anchovy (Coilia ectenes taihuensis) from Lake Chaohu, China. The lake anchovy exhibited a significant C-13- and N-15- enrichment in relation to increasing fish length, and the isotopic compositions of small lake anchovy (<= 130 mm) were significantly more enriched than those of large lake anchovy (> 130 mm). The significant differences in the isotopic compositions of small and large lake anchovy suggested that their assimilated diets differed over a period of time and reflected the size-related diet shift of this fish. Bellamya aeruginosa and Corbicula fluminea were used to establish the baseline carbon signal of benthic and pelagic food webs, and these data were used to parameterize a 2-source mixing model to estimate in consumers the contribution of carbon derived from benthic versus pelagic food webs. Mixing models showed that small lake anchovy derived only 37% of their carbon from benthic food web, indicating increased reliance on pelagic prey, whereas benthic prey contributed 71% of large lake anchovy diet, suggesting greater use of benthic sources. These data indicate that there was a change in lake anchovy feeding strategy related to their size, suggesting a role in dynamic coupling between pelagic and benthic food chains. The trophic position of small lake anchovy averaged 3.0, indicating a zooplankton-based diet, compared with 3.6 in large lake anchovy, indicative of an increase in piscivorous diet. Overlap in the isotopic compositions of small and large lake anchovy probably indicated that these fish occasionally shared common diets, as suggested by stomach content studies, and/or resulted from the differences in the rate of isotopic turnover depending on differences in growth rate and metabolic turnover between small and large anchovy during diet shift from pelagic to benthic food webs. This study presents the contributions of benthic and pelagic food webs supporting lake anchovy and indicates that the intraspecific isotopic dynamic should be considered when applying stable isotope analyses to infer trophic interactions in aquatic ecosystems.
学科主题	Ecology
WOS标题词	Science & Technology ; Life Sciences & Biomedicine
类目[WOS]	Ecology
研究领域[WOS]	Environmental Sciences & Ecology
关键词[WOS]	NITROGEN ISOTOPE RATIOS ; EUTROPHIC CHINESE LAKE ; PIKE ESOX-LUCIUS ; STABLE-ISOTOPES ; TROPHIC POSITION ; CARBON ISOTOPES ; DELTA-N-15 ; DELTA-C-13 ; FISH ; DIET
收录类别	SCI
语种	英语
WOS记录号	WOS:000247488100005
公开日期	2010-10-13
内容类型	期刊论文
源URL	[http://ir.ihb.ac.cn/handle/152342/8530]
专题	水生生物研究所_中科院水生所知识产出（2009年前）_期刊论文
作者单位	1.Chinese Acad Sci, Inst Hydrobiol, State Key Lab Freshwater Ecol & Biotechnol, Donghu Expt Stn Lake Ecosyst, Wuhan 430047, Peoples R China 2.Huazhong Agr Univ, Fisheries Coll, Wuhan 430072, Peoples R China
推荐引用方式 GB/T 7714	Xu, Jun,Zhang, Min,Xie, Ping. Size-related shifts in reliance on benthic and pelagic food webs by lake anchovy[J]. ECOSCIENCE,2007,14(2):170-177.
APA	Xu, Jun,Zhang, Min,&Xie, Ping.(2007).Size-related shifts in reliance on benthic and pelagic food webs by lake anchovy.ECOSCIENCE,14(2),170-177.
MLA	Xu, Jun,et al."Size-related shifts in reliance on benthic and pelagic food webs by lake anchovy".ECOSCIENCE 14.2(2007):170-177.