Evidence that dams promote biotic differentiation of zooplankton communities in two Brazilian reservoirs

Abstract Intensive studies of Nelson Lake, a Sudbury area lake of intermediate pH ~5.7), were begun in 1975. The chemistry of the lake was typical of that of most PreCambrian Shield lakes except that low alkalinities and high sulphate concentrations were observed along with elevated heavy metal levels. After raising the pH of Nelson Lake to 6.4 by addition of Ca(OH)2 and CaCO3, the metals were reduced to background concentrations. Phytoplankton and Zooplankton communities, which at pH of 5.7 were typical of PreCambrian lakes, were not affected by the experimental elevation of lake pH.

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Factors affecting the structure of limnetic crustacean zooplankton communities in central Ontario lakes

SIL Proceedings 1922-2010 ◽

10.1080/03680770.1974.11896107 ◽

1975 ◽

Vol 19 (1) ◽

pp. 635-643 ◽

Cited By ~ 4

Author(s):

W. Gary Sprules

Keyword(s):

Crustacean Zooplankton ◽

Factors Affecting ◽

Zooplankton Communities

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Hydrology and local environmental factors influencing zooplankton communities in floodplain ponds

Wetlands ◽

10.1672/0277-5212(2007)27[864:halefi]2.0.co;2 ◽

2007 ◽

Vol 27 (4) ◽

pp. 864-872 ◽

Cited By ~ 20

Author(s):

Kim A. Medley ◽

John E. Havel

Keyword(s):

Environmental Factors ◽

Factors Influencing ◽

Zooplankton Communities

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Changes in the crustacean communities of Lakes Michigan, Huron, and Erie following the invasion of the predatory cladoceran Bythotrephes longimanus

Canadian Journal of Fisheries and Aquatic Sciences ◽

10.1139/f04-149 ◽

2004 ◽

Vol 61 (11) ◽

pp. 2111-2125 ◽

Cited By ~ 105

Author(s):

Richard P Barbiero ◽

Marc L Tuchman

Keyword(s):

Zooplankton Community ◽

Crustacean Zooplankton ◽

Bythotrephes Longimanus ◽

Zooplankton Community Structure ◽

Cladoceran Species ◽

Invertebrate Predators ◽

Predatory Cladoceran ◽

Leptodora Kindti ◽

Escape Responses ◽

Zooplankton Communities

The crustacean zooplankton communities in Lakes Michigan and Huron and the central and eastern basins of Lake Erie have shown substantial, persistent changes since the invasion of the predatory cladoceran Bythotrephes in the mid-1980s. A number of cladoceran species have declined dramatically since the invasion, including Eubosmina coregoni, Holopedium gibberum, Daphnia retrocurva, Daphnia pulicaria, and Leptodora kindti, and overall species richness has decreased as a result. Copepods have been relatively unaffected, with the notable exception of Meso cyclops edax, which has virtually disappeared from the lakes. These species shifts have for the most part been consistent and equally pronounced across all three lakes. Responses of crustacean species to the Bythotrephes invasion do not appear to be solely a consequence of size, and it is likely that other factors, e.g., morphology, vertical distribution, or escape responses, are important determinants of vulnerability to predation. Our results indicate that invertebrate predators in general, and invasive ones in particular, can have pronounced, lasting effects on zooplankton community structure.

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