caa a22 4500 445894164 CHVBK 20180317145626.0 cr unu---uuuuu 170323e20111201xx s 000 0 eng 10.1007/s10750-011-0824-z doi (NATIONALLICENCE)springer-10.1007/s10750-011-0824-z Calcium content of littoral Cladocera in three softwater lakes of the Canadian Shield [Elektronische Daten] [Melanie Shapiera, Adam Jeziorski, Norman Yan, John Smol] Aqueous calcium (Ca) concentrations are declining in softwater lakes of the Canadian Shield largely because of decades of acid deposition and afforestation following timber harvesting. Populations of pelagic cladoceran taxa with high Ca requirements, especially Daphnia spp., are declining in response to reduced aqueous Ca availability. However, the Ca content, and thus the requirements of littoral cladoceran taxa are unknown; therefore, the potential vulnerability of this major component of lake ecosystems to ongoing regional Ca decline remains uncertain. Here, we identify the body Ca concentration of nine littoral cladoceran taxa collected from three lakes in the Muskoka-Haliburton region of Ontario, Canada. Ca content differed among taxonomic groups, ranging from 3.6mgg−1 for Acroperus harpae to 23.2mgg−1 for Disparalona spp. Perhaps surprisingly, some littoral microcrustacean taxa have Ca burdens comparable to the Ca-rich daphniids. Therefore, there may be differential responses to ongoing lake water Ca declines among taxa within littoral communities as has been observed among open-water taxa, with potential ecological repercussions for near-shore food webs. Springer Science+Business Media B.V., 2011 Calcium nationallicence Chydoridae nationallicence Environmental stress nationallicence Littoral nationallicence Canadian Shield nationallicence Shapiera Melanie Paleoecological Environmental Assessment and Research Lab, Department of Biology, Queen's University, K7L 3N6, Kingston, ON, Canada aut Jeziorski Adam Paleoecological Environmental Assessment and Research Lab, Department of Biology, Queen's University, K7L 3N6, Kingston, ON, Canada aut Yan Norman Department of Biology, York University, 4700 Keele Street, M3J 1P3, Toronto, ON, Canada aut Smol John Paleoecological Environmental Assessment and Research Lab, Department of Biology, Queen's University, K7L 3N6, Kingston, ON, Canada aut Hydrobiologia Springer Netherlands 678/1(2011-12-01), 77-83 0018-8158 678:1<77 2011 678 10750 https://doi.org/10.1007/s10750-011-0824-z text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10750-011-0824-z text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Shapiera Melanie Paleoecological Environmental Assessment and Research Lab, Department of Biology, Queen's University, K7L 3N6, Kingston, ON, Canada aut NATIONALLICENCE 700 1- Jeziorski Adam Paleoecological Environmental Assessment and Research Lab, Department of Biology, Queen's University, K7L 3N6, Kingston, ON, Canada aut NATIONALLICENCE 700 1- Yan Norman Department of Biology, York University, 4700 Keele Street, M3J 1P3, Toronto, ON, Canada aut NATIONALLICENCE 700 1- Smol John Paleoecological Environmental Assessment and Research Lab, Department of Biology, Queen's University, K7L 3N6, Kingston, ON, Canada aut NATIONALLICENCE 773 0- Hydrobiologia Springer Netherlands 678/1(2011-12-01), 77-83 0018-8158 678:1<77 2011 678 10750 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer