气候变化领域集成服务门户(CCPortal): Lake Baikal amphipods under climate change: Thermal constraints and ecological consequences, links to supplementary material

CCPortal

DOI	https://doi.org/10.1594/PANGAEA.845942
	Lake Baikal amphipods under climate change: Thermal constraints and ecological consequences, links to supplementary material
	Jakob; Lena; Axenov-Gribanov; Denis V; Gurkov; Anton N; Ginzburg; Michael; Bedulina; Daria S; Timofeyev; Maxim A; Luckenbach; Till; Lucassen; Magnus; Sartoris; Franz-Josef; Pörtner; Hans-Otto
发布日期	2016-03-19
数据集类型	dataset
英文简介	Lake Baikal, the world's most voluminous freshwater lake, has experienced unprecedented warming during the last decades. A uniquely diverse amphipod fauna inhabits the littoral zone and can serve as a model system to identify the role of thermal tolerance under climate change. This study aimed to identify sublethal thermal constraints in two of the most abundant endemic Baikal amphipods, Eulimnogammarus verrucosus and Eulimnogammarus cyaneus, and Gammarus lacustris, a ubiquitous gammarid of the Holarctic. As the latter is only found in some shallow isolated bays of the lake, we further addressed the question whether rising temperatures could promote the widespread invasion of this non-endemic species into the littoral zone. Animals were exposed to gradual temperature increases (4 week, 0.8 °C/d; 24 h, 1 °C/h) starting from the reported annual mean temperature of the Baikal littoral (6 °C). Within the framework of oxygen- and capacity-limited thermal tolerance (OCLTT), we used a nonlinear regression approach to determine the points at which the changing temperature-dependence of relevant physiological processes indicates the onset of limitation. Limitations in ventilation representing the first limits of thermal tolerance (pejus (= "getting worse") temperatures (Tp)) were recorded at 10.6 (95% confidence interval; 9.5, 11.7), 19.1 (17.9, 20.2), and 21.1 (19.8, 22.4) °C in E. verrucosus, E. cyaneus, and G. lacustris, respectively. Field observations revealed that E. verrucosus retreated from the upper littoral to deeper and cooler waters once its Tp was surpassed, identifying Tp as the ecological thermal boundary. Constraints in oxygen consumption at higher than critical temperatures (Tc) led to an exponential increase in mortality in all species. Exposure to short-term warming resulted in higher threshold values, consistent with a time dependence of thermal tolerance. In conclusion, species-specific limits to oxygen supply capacity are likely key in the onset of constraining (beyond pejus) and then life-threatening (beyond critical) conditions. Ecological consequences of these limits are mediated through behavioral plasticity in E. verrucosus. However, similar upper thermal limits in E. cyaneus (endemic, Baikal) and G. lacustris (ubiquitous, Holarctic) indicate that the potential invader G. lacustris would not necessarily benefit from rising temperatures. Secondary effects of increasing temperatures remain to be investigated.
空间范围	Latitude: 51.903240 * Longitude: 105.068780
语种	英语
国家	国际
学科大类	气候变化
学科子类	气候变化
文献类型	数据集
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/217113
推荐引用方式 GB/T 7714	Jakob,Lena,Axenov-Gribanov,et al. Lake Baikal amphipods under climate change: Thermal constraints and ecological consequences, links to supplementary material.2016-03-19.https://doi.org/10.1594/PANGAEA.845942.