Seasonal dynamics and life histories of pelagic cladocerans (Crustacea; Cladocera) in an acid boreal lake

Wærvågen, Svein Birger; Nilssen, Jens Petter

doi:10.4081/jlimnol.2011.83

Cited by 1 publication

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References 80 publications

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“…Cladocera in clearwater lakes are more sensitive to sizeselective predation by planktivorous fish than in dystrophic lakes where visibility is reduced, and Waervågen & Nilssen (2011) highlighted the importance of perch for removing Eubosmina in acidic lakes. Changes in the fish community as a result of acidification, then, could potentially have reduced the abundances of Eubosmina longispina in Beaverskin Lake, if those changes resulted in increased planktivory.…”

Section: Cladocera Assemblage Changes In Clearwater Beaverskin Lakementioning

confidence: 99%

Contrasts between dystrophic and clearwater lakes in the long‐term effects of acidification on cladoceran assemblages

Korosi

Smol

2012

Freshwater Biology

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Summary 1. Most studies on zooplankton responses to acidification have focused on clearwater lakes with a dramatic acidification history. The role of dissolved organic carbon (DOC) in moderating zooplankton responses to acidification in naturally acidic, dystrophic lakes is less well understood and is partially impeded by a lack of baseline data. 2. Cladocera leave identifiable remains preserved in lake sediments that can be used to provide information on pre‐industrial species assemblages and their responses to environmental stressors such as acidification. Therefore, we used palaeolimnological approaches to track cladoceran assemblage responses to acidification since c.1850 (inferred from sedimentary diatom assemblages) in three acidified lakes in Kejimkujik National Park (Nova Scotia, Canada) that differ markedly in DOC content. These include two highly dystrophic lakes (Kejimkujik and Pebbleogittch lakes), and one clearwater lake (Beaverskin Lake). 3. In dystrophic Pebbleogittch Lake, an increase in the acid‐tolerant, jelly‐clad, pelagic taxon Holopedium glacialis occurred coincident with diatom‐inferred pH (DI‐pH) declines, but no other notable cladoceran assemblage shifts occurred. Similarly, Cladocera assemblages did not appear to respond to lakewater acidification in dystrophic Kejimkujik Lake. 4. In contrast, in the clearwater Beaverskin Lake, several observed shifts in cladoceran assemblage corresponded to DI‐pH declines, including an increase in the proportion of littoral taxa and an increase in Hill’s N2 species diversity. This may indicate increased water clarity as a result of acidification‐related decreases in DOC, which may have enhanced growth of emergent aquatic macrophytes and improved visibility for planktivorous fish, leading to increased predation on pelagic taxa. Species shifts within the littoral assemblage of Beaverskin Lake may reflect the differing tolerances of littoral taxa to low pH and aluminium toxicity. 5. Overall, our results suggest that cladoceran assemblages in naturally acidic, dystrophic lakes may be resilient against additional pH declines related to industrial emissions of acidifying agents, as dystrophic lakes are less vulnerable to increased aluminium toxicity and acidification‐induced increases in water clarity and often have a pre‐industrial cladoceran assemblage already adapted to acidic conditions.

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Section: Cladocera Assemblage Changes In Clearwater Beaverskin Lakementioning

confidence: 99%

Contrasts between dystrophic and clearwater lakes in the long‐term effects of acidification on cladoceran assemblages

Korosi

Smol

2012

Freshwater Biology

View full text Add to dashboard Cite

show abstract

Seasonal dynamics and life histories of pelagic cladocerans (Crustacea; Cladocera) in an acid boreal lake

Abstract: In

Cited by 1 publication

References 80 publications

Contrasts between dystrophic and clearwater lakes in the long‐term effects of acidification on cladoceran assemblages

Contrasts between dystrophic and clearwater lakes in the long‐term effects of acidification on cladoceran assemblages

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