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Distribution of cladoceran assemblages across environmental gradients in Nova Scotia (Canada) lakes

Distribution of cladoceran assemblages across environmental gradients in Nova Scotia (Canada) lakes,10.1007/s10750-010-0556-5,Hydrobiologia,Jennifer B

Distribution of cladoceran assemblages across environmental gradients in Nova Scotia (Canada) lakes   (Citations: 3)
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Cladocera sub-fossils have widely been recognized as useful environmental indicators. Nevertheless, investigations into the distribution and environmental controls on Cladocera are scarce in North America, hindering their use in paleolimnological studies. Here, we examine cladoceran assemblage and size structure from the surface sediments of 49 soft-water Nova Scotia (Canada) lakes to provide ecological data on this key taxonomic group, the first study of its kind for the northern Atlantic coast of North America. We found that Nova Scotia lakes contain a diverse chydorid assemblage, but were generally dominated by the smaller pelagic herbivore Eubosmina longispina. Daphnia, a larger pelagic herbivore, was relatively uncommon in these lakes. Redundancy analyses (RDA) identified maximum lake depth and dissolved organic carbon (DOC) as the environmental variables that best explained the structuring of these cladoceran assemblages. Generalized linear models were then used to better characterize the ecological associations for individual taxa. Body size of the bosminids in these lakes was significantly correlated only to total nitrogen (TN), with larger bosminids in lakes with lower TN values. Bosminid mucro length, an indication of invertebrate and fish predation pressure, was significantly related to TN, maximum lake depth, and lake surface area. The ecological information provided by this study should assist the interpretation of paleolimnological assessments of environmental change in these and other similar lakes.
Journal: Hydrobiologia , vol. 663, no. 1, pp. 83-99, 2011
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    • ...There is currently little known regarding the Ca demands of chydorids, which are often found in relatively high abundances in softwater lakes (Walseng et al., 2003; Korosi & Smol, 2011), despite the potential insight they may provide regarding the importance of aqueous Ca for cladoceran community composition and distribution...

    Melanie Shapieraet al. Calcium content of littoral Cladocera in three softwater lakes of the ...

    • ...Examples include investigations in Swiss, Italian, and Austrian alpine lake districts (Lotter et al., 1997; Manca & Armiraglio, 2002; Bigler et al., 2006; Kamenik et al., 2007), Finland (Korhola, 1999; Nevalainen et al., 2011), Canada (Sweetman & Smol, 2006; DeSellas et al., 2008; Korosi & Smol, 2011), Denmark, and the British Isles (Brodersen et al., 1998; Amsinck et al., 2005; Davidson et al., 2007; Kattel et al., 2008, Chen ...
    • ...Although the primary forcing factors determining cladoceran distribution vary geographically, recent studies suggested that physical parameters (water depth, altitude, temperature, and ice-cover period) are especially important (Lotter et al., 1997; Korhola, 1999; Amsinck et al., 2006; Sweetman & Smol, 2006; Kamenik et al., 2007; Kattel et al., 2008; Korosi & Smol, 2011)...
    • ...Water chemistry can be influential as well; relationships have been found between cladoceran distribution and pH, nutrients, dissolved organic carbon, and ionic concentration (Bigler et al., 2006; DeSellas et al., 2008; Chen et al., 2010; Korosi & Smol, 2011)...

    Liisa Nevalainenet al. Modern and preIndustrial Age distributions of Cladocera in Italian and...

    • ...This is reflected in the elevated modern Ca levels of these lakes relative to the rest of the province, ranging from 1.0 to 3.4 mg l -1 (Table 1; Korosi and Smol 2011),...
    • ...In modern cladoceran assemblages, Alona quadrangularis, which declined in abundance since pre-industrial times, was positively correlated with pH, while Alona intermedia, which increased in abundance, was more prevalent in low-[Ca] lakes (Korosi and Smol 2011)...
    • ...The Ca tolerances of Alona and other chydorid taxa are presently poorly understood, and it is unknown how various Alona taxa respond to Ca decline, though there is field survey evidence that A. intermedia may be favored under low [Ca] (Korosi and Smol 2011)...
    • ...DOC levels are rising in many lakes in southwest Nova Scotia as a result of reduced sulphate deposition and climate change (Clair et al. 2002, 2011), and may also impact the abundance of Alona in Nova Scotia (Korosi and Smol 2011)...

    Jennifer B. KorosiJohnet al. A comparison of present-day and pre-industrial cladoceran assemblages ...

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