气候变化领域集成服务门户(CCPortal): Is there a common threshold to subfossil chironomid assemblages at 16 m water depth? Evidence from the Tibetan Plateau

CCPortal

DOI	10.4081/jlimnol.2020.1964
	Is there a common threshold to subfossil chironomid assemblages at 16 m water depth? Evidence from the Tibetan Plateau
	Laug, Andreas; Turner, Falko; Engels, Stefan; Wang, Junbo; Haberzettl, Torsten; Ju, Jianting; Yu, Siwei; Kou, Qiangqiang; Boerne, Nicole; Schwalb, Antje
通讯作者	Laug, A (通讯作者)
发表日期	2020
ISSN	1129-5767
EISSN	1723-8633
起始页码	278
结束页码	292
卷号	79 期号:3
英文摘要	Fluctuating lake levels are an important driver of ecosystem change, and changes in the precipitation/evaporation balance of a region can lead to undesirable changes in ecosystem functioning. Large-scale changes in hydrology will become increasingly more likely as a result of ongoing climate change in the coming century. This is especially true for the Tibetan Plateau, which plays a crucial role as the Asian water tower for the surrounding densely populated regions. Chironomids (Diptera: Chironomidae) have proven to be one of the most valuable bioindicators for monitoring and reconstructing the development of aquatic ecosystems. Besides temperature, water depth and salinity are two of the most important environmental factors affecting chironomids. To study the relationship between chironornids and water depth, we analyzed surface sediment samples of two large Tibetan lakes, Selin Co and Taro Co. These lakes have similar environmental conditions (e.g. elevation, temperature and oxygenation) but show strong differences in salinity (7-10 and 0.5 ppt, respectively). Our results show that the chironomid assemblages in both lakes have similar water depths at which the fauna abruptly changes in composition, despite different faunal assemblages. The most important boundaries were identified at 0.8 and 16 m water depth. While the uppermost meter, the splash zone, is characterized by distinctly different conditions, resulting from waves and changing water levels, the cause of the lower zone boundary remains enigmatic. Even though none of the measured water depth-related factors, such as water temperature, oxygen content, sediment properties, light intensity or macrophyte vegetation, show a distinct change at 16 m water depth, comparison to other records show that a similar change in the chironomid fauna occurs at 16 m water depth in large, deep lakes around the world. We propose that this boundary might be connected to water pressure influencing the living conditions of the larvae or the absolute distance to the surface that has to be covered for the chironomid larvae to hatch. We conclude that water depth either directly or indirectly exerts a strong control on the chironomid assemblages even under different salinities, resulting in distribution patterns that can be used to reconstruct past fluctuations in water depths.
关键词	LAGUNA-POTROK-AIKE ENVIRONMENTAL-CHANGES SPATIAL-DISTRIBUTION SURFACE SEDIMENTS LEVEL CHANGE SELIN CO TARO CO LAKE CLIMATE DIPTERA
英文关键词	Midges; alpine lakes; salinity; Selin Co; Taro Co; water depth thresholds; lake depth
语种	英语
WOS研究方向	Marine & Freshwater Biology
WOS类目	Limnology
WOS记录号	WOS:000600514700006
来源期刊	JOURNAL OF LIMNOLOGY
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/259965
推荐引用方式 GB/T 7714	Laug, Andreas,Turner, Falko,Engels, Stefan,et al. Is there a common threshold to subfossil chironomid assemblages at 16 m water depth? Evidence from the Tibetan Plateau[J]. 中国科学院青藏高原研究所,2020,79(3).
APA	Laug, Andreas.,Turner, Falko.,Engels, Stefan.,Wang, Junbo.,Haberzettl, Torsten.,...&Schwalb, Antje.(2020).Is there a common threshold to subfossil chironomid assemblages at 16 m water depth? Evidence from the Tibetan Plateau.JOURNAL OF LIMNOLOGY,79(3).
MLA	Laug, Andreas,et al."Is there a common threshold to subfossil chironomid assemblages at 16 m water depth? Evidence from the Tibetan Plateau".JOURNAL OF LIMNOLOGY 79.3(2020).