. The Canadian field-naturalist. 1998 WiLHELM, Hardie, McNaught, AND Clare: Large Daphnia All. 4 H § 2 â g â > ^ 0 B 8 O 6^ 2 10 25 20 15 - 10 - Jul. 10, 1997 u li J^-^ 4 V^J^ Jul. 28, 1997 IJU Aug. 14, 1997 UHr^4i ri-^ Aug. 26, 1997 ^ I ' r Daphnia body size (mm) Figure 1. Size distributions oi Daphnia middendorjflana from Pipit Lake, Alberta, Canada. Plankton net tows were initiated 1 m above the bottom of the lake while bottom clos- ing net (BCN) hauls sampled the entire water column and the top sediment layers. In 1995 (A) and 1996 (B), lar
. The Canadian field-naturalist. 1998 WiLHELM, Hardie, McNaught, AND Clare: Large Daphnia All. 4 H § 2 â g â > ^ 0 B 8 O 6^ 2 10 25 20 15 - 10 - Jul. 10, 1997 u li J^-^ 4 V^J^ Jul. 28, 1997 IJU Aug. 14, 1997 UHr^4i ri-^ Aug. 26, 1997 ^ I ' r Daphnia body size (mm) Figure 1. Size distributions oi Daphnia middendorjflana from Pipit Lake, Alberta, Canada. Plankton net tows were initiated 1 m above the bottom of the lake while bottom clos- ing net (BCN) hauls sampled the entire water column and the top sediment layers. In 1995 (A) and 1996 (B), large D. middendoijfiana (up to mm) were collected from the bottom 1 m of the lake. In 1997 (C-F), a large cohort was also present but only few individuals in July (C) and August (E) larger than the largest Daphnia in the plankton hauls were retrieved with the BCN. The large cohort could be distinguished until August 14 (E) at which time ephippia production commenced, indicating the large Daphnia cohort persisted through at least 2/3 of the open-water season. BCN hauls were not taken on 28 July 1997 because of mechanical Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ottawa Field-Naturalists' Club. Ottawa, Ottawa Field-Naturalists' Club
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