气候变化领域集成服务门户(CCPortal): Interannual changes in δ15N baseline in a lake–swamp–river food web: effects of summer precipitation in West Siberian forest steppe

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DOI	10.1007/s10533-020-00694-3
	Interannual changes in δ15N baseline in a lake–swamp–river food web: effects of summer precipitation in West Siberian forest steppe
	Kanaya G.; Yurlova N.I.; Yadrenkina E.N.; Okano J.-I.; Shikano S.
发表日期	2020
ISSN	0168-2563
起始页码	217
结束页码	233
卷号	150 期号:2
英文摘要	Frequency and intensity of precipitation events can alter hydrological conditions of lotic systems and material inflow from the catchment. In this study, interannual changes in food web structure were investigated in a lake–swamp–river system in the semi-arid West Siberian forest-steppe region using carbon and nitrogen stable isotope ratios (δ13C and δ15N). The δ15N signatures of aquatic producers and consumers including zooplankton, benthic invertebrates, and fish sharply increased (up to 7.2‰ in range) in 2009 under high summer precipitation. This would reflect the inflow of 15N-rich nutrients accumulated in the catchment through natural and anthropogenic activities, e.g., sewage, livestock farming, evaporation, and/or microbial denitrification. In 2010, benthic producers including epiphytes and macrophytes were more 13C-enriched, which is likely due to limited supply of dissolved inorganic carbon (DIC) under water stagnation, leading to a large isotopic fractionation during photosynthesis. However, 13C-enrichments in the benthic producers were not reflected to those of aquatic consumers in the habitat. Interannual changes in δ13C of particulate organic matter (POM; a proxy of phytoplankton) were reflected to those of zooplankton, benthic invertebrates, and fish fry, suggesting the trophic importance of autochthonous phytoplankton in the system. These findings suggest that occasional precipitation events in semi-arid forest-steppe regions can modify nutrient flux from the catchment, leading to changes in δ15N baseline in the lotic food web. © 2020, Springer Nature Switzerland AG.
英文关键词	Aquatic food web; Producer; River flow regime; Trophic baseline; West Siberian forest-steppe; δ13C and δ15N
语种	英语
scopus关键词	annual variation; catchment; fish; food web; forest-steppe; frequency analysis; lotic environment; nitrogen isotope; particulate organic matter; phytoplankton; precipitation intensity; river system; semiarid region; summer; trophic interaction; zooplankton; Invertebrata
来源期刊	Biogeochemistry
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/153110
作者单位	National Institute for Environmental Studies (NIES), 16-2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan; Institute of Systematics and Ecology of Animals, Siberian Branch of the Russian Academy of Sciences (ISEA SB RAS), 11 Frunze St., Novosibirsk, 630091, Russian Federation; Center for Northeast Asian Studies, Tohoku University, Kawauchi, Aoba-ku, Sendai, 980-8576, Japan
推荐引用方式 GB/T 7714	Kanaya G.,Yurlova N.I.,Yadrenkina E.N.,等. Interannual changes in δ15N baseline in a lake–swamp–river food web: effects of summer precipitation in West Siberian forest steppe[J],2020,150(2).
APA	Kanaya G.,Yurlova N.I.,Yadrenkina E.N.,Okano J.-I.,&Shikano S..(2020).Interannual changes in δ15N baseline in a lake–swamp–river food web: effects of summer precipitation in West Siberian forest steppe.Biogeochemistry,150(2).
MLA	Kanaya G.,et al."Interannual changes in δ15N baseline in a lake–swamp–river food web: effects of summer precipitation in West Siberian forest steppe".Biogeochemistry 150.2(2020).