干旱区生态环境知识资源中心(Arid): Anthropogenic forcing leads to an abrupt shift to phytoplankton dominance in a shallow eutrophic lake

Arid

DOI	10.1111/fwb.14214
	Anthropogenic forcing leads to an abrupt shift to phytoplankton dominance in a shallow eutrophic lake
	King, Leighton; Devey, Mark; Leavitt, Peter R.; Power, Mitchell J.; Brothers, Soren; Brahney, Janice
通讯作者	King, L
来源期刊	FRESHWATER BIOLOGY
ISSN	0046-5070
EISSN	1365-2427
出版年	2024
卷号	69 期号:3 页码:335-350
英文摘要	The timing and causes of lake eutrophication are often obscured when multiple anthropogenic disturbances coincide in space and time. This issue is particularly problematic for shallow lakes in arid regions that experience strong climatic forcing which alters lake hydrology and water levels, and further conflates causal drivers.We used Utah Lake (Utah, U.S.A.) as a model system to examine how natural hydrological variability and anthropogenic forcing influence ecosystem structure of large shallow lakes in arid climates. Paleolimnological analyses of sedimentary biogeochemistry, pigments, DNA, and morphological fossils were used to identify shifts in primary production and evaluate the relative influence of regional climate-driven hydrological variability and of humans on ecosystem structure.Sediment cores revealed that the phase prior to non-indigenous settlement included numerous macrophyte and gastropod remains, sedimentary DNA from plants, low organic matter, and low algal production. An abrupt transition occurred in the late 19th century concomitant with agricultural and urban expansion and the introduction of common carp, which was characterised by a loss of macrophytes and an increase in phytoplankton abundance as indicated by sedimentary DNA and pigment concentrations. A further shift to increased cyanobacteria occurred c. 1950 when exponential population growth increased wastewater influx, as recorded by sedimentary delta 15N values.Taken together, our data demonstrate that the current eutrophic state of Utah Lake is a function of anthropogenic forcing rather than natural climate-driven hydrological fluctuations. Furthermore, large lakes in arid regions can exhibit similar patterns of abrupt ecosystem change between alternate states as those observed in northern temperate/boreal and subtropical ecosystems.
英文关键词	arid lakes hydrological variation invasive fish nutrient enrichment paleolimnology
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:001139125400001
WOS关键词	WATER-LEVEL FLUCTUATIONS ; CARP CYPRINUS-CARPIO ; REGIME SHIFTS ; COMMON CARP ; CULTURAL EUTROPHICATION ; SUBTROPICAL LAKES ; BAYESIAN-ANALYSIS ; TROPHIC CASCADES ; RECENT SEDIMENTS ; ORGANIC-MATTER
WOS类目	Ecology ; Marine & Freshwater Biology
WOS研究方向	Environmental Sciences & Ecology ; Marine & Freshwater Biology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/403815
推荐引用方式 GB/T 7714	King, Leighton,Devey, Mark,Leavitt, Peter R.,et al. Anthropogenic forcing leads to an abrupt shift to phytoplankton dominance in a shallow eutrophic lake[J],2024,69(3):335-350.
APA	King, Leighton,Devey, Mark,Leavitt, Peter R.,Power, Mitchell J.,Brothers, Soren,&Brahney, Janice.(2024).Anthropogenic forcing leads to an abrupt shift to phytoplankton dominance in a shallow eutrophic lake.FRESHWATER BIOLOGY,69(3),335-350.
MLA	King, Leighton,et al."Anthropogenic forcing leads to an abrupt shift to phytoplankton dominance in a shallow eutrophic lake".FRESHWATER BIOLOGY 69.3(2024):335-350.