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Morphological Variability and Distribution of Aquatic Invertebrates (Principally Crustacea) from the Cumberland Peninsula and Frobisher Bay Regions, Baffin Island, N.W.T., Canada

John H. Bushnell and Earl R. Byron
Arctic and Alpine Research
Vol. 11, No. 2 (May, 1979), pp. 159-177
DOI: 10.2307/1550643
Stable URL: http://www.jstor.org/stable/1550643
Page Count: 19
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Morphological Variability and Distribution of Aquatic Invertebrates (Principally Crustacea) from the Cumberland Peninsula and Frobisher Bay Regions, Baffin Island, N.W.T., Canada
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Abstract

Eighteen pools, ponds, and lakes were sampled in the Cumberland Peninsula region, Baffin Island, in 1969 and 1975. One additional lake and four ponds were investigated in the Frobisher Bay region. Primary consideration was given to the crustacean fauna. Lepidurus arcticus was found in Broughton Island pond. Attention was given to morphological variation. In terms of numbers the ranges of certain characters equaled or exceeded the maxima of previous reports, e.g., number of abdominal legs and median telson spines, and the unusually high percentage of specimens with incomplete body rings preceding the telson. Branchinecta paludosa was collected from nine sites, including lakes, permanent ponds, and temporary pools. Egg sacs contained from 1 to 22 eggs. Hyalella azteca, the first record for the barren lands, was found in a lake near Frobisher Bay village. Daphnia pulex, collected at several locations, revealed certain characteristics which overlap those of Daphnia middendorffiana. Other cladocerans included Acroperus harpae, Chydorus sphaericus, Holopedium gibberum, and Alona guttata. The copepod Diaptomus minutus was the most common entomostracan. Certain genera or species of rotifers are discussed briefly. The species diversity of the plankton of ponds and lakes is compared with previously reported information. The only oribatid mite, collected at three sites in shore vegetation, was Platynothrus peltifer.

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