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Population and production ecology of zooplankton in Ogac Lake, a Landlocked Fiord on Baffin Island
McLaren, I.A. (1969). Population and production ecology of zooplankton in Ogac Lake, a Landlocked Fiord on Baffin Island. J. Fish. Res. Bd. Can. 26(6): 1485-1559
In: Journal of the Fisheries Research Board of Canada. The Fisheries Research Board of Canada: Toronto. ISSN 0015-296x, more
Peer reviewed article  

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Keywords
    Abundance; Distribution; Growth; Temperature effects; Water temperature; Weight; Zooplankton; Aglantha digitale (O. F. Müller, 1776) [WoRMS]; Beroe cucumis Fabricius, 1780 [WoRMS]; Eurytemora americana Williams, 1906 [WoRMS]; Mya truncata Linnaeus, 1758 [WoRMS]; Oithona similis Claus, 1866 [WoRMS]; Pseudocalanus minutus (Krøyer, 1845) [WoRMS]; Sagitta elegans Verrill, 1873 [WoRMS]; Fresh water

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  • McLaren, I.A.

Abstract
    Niche diversification is clear in the lake, and some widespread arctic species may be excluded competitively. The marked seasonality of the lake (and other waters of middle and high latitudes) means that controls of population size and growth occur when food is in excess. The studies of vertical distribution and migration demonstrate the necessity for close vertical spacing of samples, and detailed consideration of different stages and size classes. Support is partial at best for the theory that vertical migration is adapted to control growth and development and maximize rates of increase in thermally stratified waters. The results nevertheless stress the over-riding influence of temperature on body size of zooplankters. Overall zooplankton production was about 1 g C/m2 per year. 'Herbivore' production was about 7% of primary production in 1962, and was little enhanced by a seven-fold increase of primary production in the fertilization experiment. Predator production ranged between 16 and 68% of 'herbivore' production. Production/biomass ratios averaged about 3:1, but wide variations occurred, such that the ratios cannot be considered to be 'physiological' or determinate for a species or a system. It is argued that production cannot be measured or 'explained' in highly seasonal environments like Ogac Lake without detailed quantitative studies of life histories.

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