气候变化领域集成服务门户(CCPortal): Lake ecosystem on the Qinghai-Tibetan Plateau severely altered by climatic warming and human activity

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DOI	10.1016/j.palaeo.2021.110509
	Lake ecosystem on the Qinghai-Tibetan Plateau severely altered by climatic warming and human activity
	Liang, Jie; Lupien, Rachel L.; Xie, Haichao; Vachula, Richard S.; Stevenson, Mark A.; Han, Bo-Ping; Lin, Qiuqi; He, Yue; Wang, Mingda; Liang, Peng; Huang, Yongsong; McGowan, Suzanne; Hou, Juzhi; Russell, James M.
通讯作者	Hou, JZ (通讯作者)
发表日期	2021
ISSN	0031-0182
EISSN	1872-616X
卷号	576
英文摘要	Modelling, monitoring, and experimental data have shown that global climate change can impact aquatic phytoplankton communities directly, through the effects of warming on primary producers, as well as indirectly through cascading effects from higher trophic levels. Although both concepts are common in modern limnological studies, it remains unclear whether the 'top-down' effects from higher trophic levels on phytoplankton exert strong effects in natural systems over long (centennial) timescales. Here, we use multiproxy data including pigments, zooplankton remains, nutrient concentrations, and paleoclimate indicators from a sediment core in Dagze Co, Central Tibet (a two-trophic level lake) to reconstruct algal production, zooplankton community, nutrient and salinity changes. Our results show that top-down effects of higher trophic levels offset effects from warming and nutrient addition on algal growth. Warming enhanced glacial meltwater inflow to the lake, and intensive human activities increased nutrient inputs. Changes in lake salinity and N:P ratios coincided with zooplankton community shifts during the past 600 years, and Daphnia tibetana replaced the brine shrimp, Artemia tibetiana, after the relocation of a town to upstream of the lake in the 1980s led to overharvesting of the brine shrimp. These shifts contributed strongly to changes in algal communities, with changes in zooplankton leading to strong top-down effects that decreased algal production through increasing grazing pressure despite increasing nutrient concentrations. Our results suggest that the typical external drivers (climate and nutrients) of lake ecosystems may be suppressed by internal shifts in plankton communities in lakes.
关键词	FRESH-WATER ORGANIC-CARBON COMMUNITY STRUCTURE GLACIAL MELTWATER EARLY DIAGENESIS CHLOROPHYLL-A PHYTOPLANKTON ZOOPLANKTON TANGANYIKA NITROGEN
英文关键词	Top-down effect; Carotenoid pigments; Overharvesting; Nutrients; Paleolimnology
语种	英语
WOS研究方向	Physical Geography ; Geology ; Paleontology
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary ; Paleontology
WOS记录号	WOS:000668458200018
来源期刊	PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/260517
推荐引用方式 GB/T 7714	Liang, Jie,Lupien, Rachel L.,Xie, Haichao,et al. Lake ecosystem on the Qinghai-Tibetan Plateau severely altered by climatic warming and human activity[J]. 中国科学院青藏高原研究所,2021,576.
APA	Liang, Jie.,Lupien, Rachel L..,Xie, Haichao.,Vachula, Richard S..,Stevenson, Mark A..,...&Russell, James M..(2021).Lake ecosystem on the Qinghai-Tibetan Plateau severely altered by climatic warming and human activity.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,576.
MLA	Liang, Jie,et al."Lake ecosystem on the Qinghai-Tibetan Plateau severely altered by climatic warming and human activity".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 576(2021).