Climate change and Saharan dust drive recent cladoceran and primary production changes in remote alpine lakes of Sierra Nevada, Spain

Laura Jiménez; Kathleen M. Rühland; Adam Jeziorski; John P. Smol; Carmen Pérez-Martínez

doi:10.1111/gcb.13878

journal article Nov 01, 2017

Climate change and Saharan dust drive recent cladoceran and primary production changes in remote alpine lakes of Sierra Nevada, Spain

Laura Jiménez

Kathleen M. Rühland Adam Jeziorski

John P. Smol

Carmen Pérez-Martínez

Global Change Biology Vol. 24 No. 1 · Wiley

View at Publisher Save 10.1111/gcb.13878

Abstract

AbstractRecent anthropogenic climate change and the exponential increase over the past few decades of Saharan dust deposition, containing ecologically important inputs of phosphorus (P) and calcium (Ca), are potentially affecting remote aquatic ecosystems. In this study, we examine changes in cladoceran assemblage composition and chlorophyll‐a concentrations over the past ~150 years from high‐resolution, well‐dated sediment cores retrieved from six remote high mountain lakes in the Sierra Nevada Mountains of Southern Spain, a region affected by Saharan dust deposition. In each lake, marked shifts in cladoceran assemblages and chlorophyll‐a concentrations in recent decades indicate a regional‐scale response to climate and Saharan dust deposition. Chlorophyll‐a concentrations have increased since the 1970s, consistent with a response to rising air temperatures and the intensification of atmospheric deposition of Saharan P. Similar shifts in cladoceran taxa across lakes began over a century ago, but have intensified over the past ~50 years, concurrent with trends in regional air temperature, precipitation, and increased Saharan dust deposition. An abrupt increase in the relative abundance of the benthic cladoceran Alona quadrangularis at the expense of Chydorus sphaericus, and a significant increase in Daphnia pulex gr. was a common trend in these softwater lakes. Differences in the magnitude and timing of these changes are likely due to catchment and lake‐specific differences. In contrast with other alpine lakes that are often affected by acid deposition, atmospheric Ca deposition appears to be a significant explanatory factor, among others, for the changes in the lake biota of Sierra Nevada that has not been previously considered. The effects observed in Sierra Nevada are likely occurring in other Mediterranean lake districts, especially in softwater, oligotrophic lakes. The predicted increases in global temperature and Saharan dust deposition in the future will further impact the ecological condition of these ecosystems.

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Details

Published: Nov 01, 2017
Vol/Issue: 24(1)
License: View

Authors

L

Laura Jiménez

Institute of Water Research University of Granada Granada Spain; Department of Ecology Faculty of Science University of Granada Granada Spain

K

Kathleen M. Rühland

Paleoecological Environmental Assessment and Research Lab (PEARL) Department of Biology Queen's University Kingston ON Canada

A

Adam Jeziorski

Paleoecological Environmental Assessment and Research Lab (PEARL) Department of Biology Queen's University Kingston ON Canada

J

John P. Smol

Paleoecological Environmental Assessment and Research Lab (PEARL) Department of Biology Queen's University Kingston ON Canada

C

Carmen Pérez-Martínez

Institute of Water Research University of Granada Granada Spain; Department of Ecology Faculty of Science University of Granada Granada Spain

Funding

Natural Sciences and Engineering Research Council of Canada

Ministerio de Economía y Competitividad Award: CGL2011‐23483

MINISTERIO DE CIENCIA E INNOVACIÓN

Ministério do Meio Ambiente Award: 87/2007

Cite This Article

Laura Jiménez, Kathleen M. Rühland, Adam Jeziorski, et al. (2017). Climate change and Saharan dust drive recent cladoceran and primary production changes in remote alpine lakes of Sierra Nevada, Spain. Global Change Biology, 24(1). https://doi.org/10.1111/gcb.13878

Climate change and Saharan dust drive recent cladoceran and primary production changes in remote alpine lakes of Sierra Nevada, Spain

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