POPULATION DYNAMICS AND COMMUNITY ECOLOGY OF ZOOPLANKTON II.

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POPULATION DYNAMICS AND COMMUNITY ECOLOGY OF ZOOPLANKTON II

Often see coexistence of several congenerics. Mechanisms which promote their coexistence: Seasonal separation Vertical separation Size differences in prey

An oxbow (Varza Lake) was examined for vertical migration by zooplankters Rejas, D., L. de Meester, L. Ferrufino, M. Maldonado, and F. Ollevier Diel vertical migration of zooplankton in an Amazonian varzea lake. Studies on Neotropical Fauna and Environment. 42(1):

Vertical Migration by Microcrustaceans Figure 3. Vertical distribution of the microcrustacean taxa (Mesocyclops and Notodiaptomus) in Laguna Bufeos. Abundance is expressed as percentage of total number of individuals in vertical profile. White bars: day; dark bars: night. Error bars equal twice the standard error of the mean. Rejas, D., L. de Meester, L. Ferrufino, M. Maldonado, and F. Ollevier Diel vertical migration of zooplankton in an Amazonian varzea lake. Studies on Neotropical Fauna and Environment. 42(1):

Vertical Migration by Rotifers Figure 4. Vertical distribution of the rotifer taxa in Laguna Bufeos. Abundance is expressed as percentage of total number of individuals in vertical profile. White bars: day; dark bars: night. Error bars equal twice the standard error of the mean. Rejas, D., L. de Meester, L. Ferrufino, M. Maldonado, and F. Ollevier Diel vertical migration of zooplankton in an Amazonian varzea lake. Studies on Neotropical Fauna and Environment. 42(1):

Rangel, L.M., L.H.S. Silva, M.S. Arcifa, and A. Perticarrari Driving forces of the diel distribution of phytoplankton functional groups in a shallow tropical lake. Brazilian Journal of Biology. 69(1): doi: /S

Sarvala, J Ecology and the role of benthic copepods in northern lakes. Journal of Marine Systems. 15: Fig. 4. Daily production of certain species of benthic copepods in Lake Pääjärvi (Sarvala, unpublished). (a) Attheyella crassa at 2 m depth. (b) Moraria brevipes at 2 m depth. (c) Bryocamptus echinatus at 40 m depth.

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Summary for Zooplankton in Freshwater Systems RiversReservoirsLakes Zooplankton community structure Dominated by small forms with rapid, mostly benthic, life cycles Gradient from riverine to lacustrine forms Complex communities with protistan mesozooplankton and macrozooplankton Zooplankton community development Low development; mainly derived from lakes and floodplain Highest development in transitional zone Vertical and seasonal gradients; stable and abundant Zooplankton feedingMainly particulate detritus; some planktonic or benthic algae Detritus and phytoplankton Phytoplankton dominant food source Zooplankton growthLow, but highest in high-order streams; limited by displacement by unidirectional flow Low to moderate; but variable with changing food availability and quality Moderate to high