Strong, K.W. (1987). Analysis of zooplankton communities of Nova Scotian lakes with reference to water chemistry. Proceedings of the Nova Scotian Institute of Science. 37(1):37-51, figs. 1-3, tabs. 1-10. (xii.1987, French summary).

115407

Strong, K.W.

1987

37(1):37-51, figs. 1-3, tabs. 1-10. (xii.1987, French summary)

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Zooplankton collections from Nova Scotian lakes were analysed to determine if relationships existed between plankton distributions and chemical variables associated with add rain. A total of 27 taxa was identified. The most common species included Diapromus minu/us, Bosmina longirostris and Mesocyc/ops edax. Most lakes contained 3-7 species (excl uding ratifers and cope pod nauplii) and were dominated by 1-3 species. Simple statistics such as the number of species, diversity index, and evenness index were poorly correlated with abiotic variables. The best correlations indicated that diversity and evenness were negatively correlated with water temperature, water transparency and lake area, and positively correlated with conductivity. Principal component analysis demonstrated that two species, D. minutus and B. longirostris, account for the greatest proportion of the abiotic variance in zoopla nkton communities. D. minutus was associated with warm, turbid waters of decreased acidity whereas 8. longirosrris dominated in the opposite conditions (PC1). Mesocyclops edax was usually dominant in clear, deep lakes (PC2), and Daphnia catawba was often dominant in lakes with highly coloured water (PO). The first three principal components accounted for about 73% of the lotal variance in zooplankton composition.

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