Global ETD Search
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Showing 1 to 10 of 10 for “"chaoborus"”.
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The consequences of predation by Chaoborus americanus on Daphnia pulex
… of predation by the aquatic dipteran larva Chaoborus americanus on the crustacean Daphnia pulex were investigated with a combination of laboratory and field assessments. All approaches indicated that Chaoborus inflict a pattern of size-specific mortality on Daphnia that can be well …
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Diel and horizontal patterns in the densities of Bythotrephes, Chaoborus, and Leptodora in a Minnesota Reservoir
… planktonic predators—Bythotrephes cederstroemii, Chaoborus punctipennis, and Leptodora kindtii—in one system can help describe food web dynamics and inform management decisions. The population densities of these three species were examined in a tannin-stained lake (Island Lake Reservoir, Duluth, …
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Effects of water color on food web structure in freshwater lakes
… guided fish, but invertebrate predators such as Chaoborus should become more important. Since fish prefer larger prey but Chaoborus can only ingest smaller zooplankton, increased water color should cause a shift from small to large zooplankton species. To test this hypothesis, I analyzed two lake …
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Foraging of juvenile crappies in turbidity: the difference is black and white
… diets when three distinct prey types (Daphnia, Chaoborus, and Chironomus) were offered. Unexpectedly, black crappies exhibited universally greater diet biomass than white crappies. Black crappies displayed relatively higher prey consumption and were more size selective of a single prey type, …
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Benthic Population Distributions in Red Rock Reservoir, Iowa Summer 1972
… comprised 52.4%, Chironomidae 44.8% and Chaoborus 2.8%. Total mean numbers collected ranged from 24 to 212 organisms/m2. Thermal and chemical stratification of the bottom waters occurred temporarily. Conclusions. The benthic standing crop in Red Rock Reservoir has increased since 1970 but …
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Costs and benefits of Daphnia antipredator behavior and consequences on community stability
… stability, I used the planktivorous fish - Chaoborus - Daphnia system. In the laboratory, I found that clonal variance of Daphnia antipredator defenses was high, and that behavioral, morphological, and life-history defenses were uncoupled. To estimate the costs and benefits of antipredator …
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Predators alter host-parasite interactions via trait-mediated indirect effects
… macrochirus) and larvae of the phantom midge fly Chaoborus punctipennis, to observe how predator presence altered Daphnia traits. These trait changes were predicted to influence the interaction between Daphnia and Metschnikowia bicuspidata, a virulent and common (>40% prevalence in some lakes) …
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Environmental Limits To Invasion Of Ponds By The Exotic Zooplankter Daphnia Lumholtzi Sars
… v. louisianensis, and the dipteran insect Chaoborus americanus. Both predators were significantly able to suppress D. lumholtzi populations. In two field experiments, I introduced D. lumholtzi into 50L play pools, which contained different zooplankton community treatments (pond, lake, …
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Structure and function of zooplankton colonization in twelve new experimental ponds
… (Copepoda, Cladocera, Rotifera, ostracoda and Chaoborus) and analyzed. Rotifers dominated zooplankton communities in densities and biomass, and ponds differed in taxa densities and biomasses. Zooplankton community function was more similar among ponds than community structure. Multivariate …
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Invasive fish effects on the invertebrate constituents of wetland communities
… common littoral taxa, bivalves, chironomids, Chaoborus, oligochaetes, coenagrionids, and baetid mayflies were found to significantly vary in abundance. Our stable isotope analysis found evidence to suggest potential niche overlap between waterfowl and stickleback; assessment of δ13C ratios …