Implications of climate change for Daphnia in alpine lakes: predictions from long-term dynamics, spatial distribution, and a short-term experiment |
| |
Authors: | Janet M Fischer Mark H Olson Craig E Williamson Jennifer C Everhart Paula J Hogan Jeremy A Mack Kevin C Rose Jasmine E Saros Jeffery R Stone and Rolf D Vinebrooke |
| |
Institution: | (1) Department of Biology, Franklin and Marshall College, Lancaster, PA 17604-3003, USA;(2) Department of Zoology, Miami University, 212 Pearson Hall, Oxford, OH 45056, USA;(3) School of Biology and Ecology, University of Maine, Orono, ME 04469, USA;(4) Climate Change Institute, University of Maine, Orono, ME 04469, USA;(5) Department of Biological Sciences, University of Alberta, Edmonton, AB, T6G 2E9, Canada |
| |
Abstract: | Alpine lakes may be particularly useful as sentinels of climate change because they are highly sensitive to environmental
conditions. To explore the potential biotic consequences of climate change in these systems, we conducted paleo- and neoecological
observational studies, as well as a short-term experiment to examine Daphnia responses to changing environmental conditions in Rocky Mountain alpine lakes. Our analysis of a sediment core from Emerald
Lake representing two periods from the Holocene revealed a significant positive relationship between the abundance of Daphnia remains and fossil Aulacoseira lirata, a diatom associated with deeper mixing depths. In addition, we detected a significant increase in mean Daphnia density in the long-term record (1991–2005) from Pipit Lake, a trend that correlated well with increases in mean surface
temperature. In our survey of Daphnia in 10 lakes in the Canadian Rocky Mountains, Daphnia abundance was positively correlated with both dissolved organic carbon concentration and temperature. Finally, our short-term
incubation experiment demonstrated significant effects of physical conditions (i.e., temperature and/or UV radiation) and
water chemistry on the juvenile growth rate of Daphnia. Overall, our findings highlight the sensitivity of Daphnia to changes in mixing depth, water temperature, and dissolved organic matter, three limnological variables that are highly
sensitive to changes not only in air temperature, but also to precipitation and location of the treeline in alpine catchments.
Thus, we conclude that Daphnia abundance could serve as a powerful sentinel response to climate change in alpine lakes of the Rocky Mountains. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|