Conway, J.B. (1977). Seasonal and depth distribution of Limnocalanus macrurus at a site on western Lake Superior. Journal of Great Lakes Research. 3(1-2):15-19, figs. 1-3, tabs. 1-2. (x-1977).

82394

10.1016/S0380-1330(77)72224-5 [view]

Conway, J.B.

1977

3(1-2):15-19, figs. 1-3, tabs. 1-2. (x-1977)

Publication

The life history stages of the relict calanoid, Limnocalanus macrurus Sars, were investigated relative to their seasonal occurrences and depth distribution at a site off the northern shore of Lake Superior in 1971. The copepodid stages most numerous were: I through IV prior to July, V in July, and VI in August and September. The male to female ratios of stages V and VI were 1:1.1 and 1:2.7 respectively. The length-weight regression for L. macrurus was: Log10 dry weight (μg) = 0.98 length (mm) – 0.79. As long as zooplankton samples were collected around midday, the majority of the L. macrurus copepodids of a specific stage preferred a particular depth and this depth increased as the stages matured. The contribution of L. macrurus to the crustacean zooplankton biomass varied according to depth. The zooplankton biomass reached its maximum volume at 5 meters in August and September. L. macrurus contributed little to the biomass at 5 meters, but played an increasingly greater role as depth increased. It was frequently found to be the most important component of the zooplankton at 40 and 50 meters.

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