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Showing 1 to 20 of 31 for “"Cladocera."”.
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Distribution of Rotifera and Cladocera in a regulated river system
… was to determine distributions of Rotifera and Cladocera in the Kanawha River in West Virginia. Rotifera were sampled monthly for twelve months with a Juday trap in the more lotic upstream end of Winfield pool (UW), and the more lentic downstream end of Winfield pool (LW) to determine seasonal …
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Assessing Biological Recovery of Cladocera from Sudbury-Area Lakes Using Paleolimnology
… approaches to examine temporal trends in cladoceran zooplankton, from pre-impact conditions, through the period of acidification/metal contamination, and following the implementation of emission controls. I assess the degree of biotic recovery that has taken place in these lakes, and …
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Population Dynamics of Copepoda and Cladocera in an Iowa farm pond, Summer 1973
The problem. To calculate rates for birth, death, and natural increase of zooplankton found in an unpolluted artificial pond. This will serve as a basis for comparisons with other bodies of water to show man's effect upon one of the most basic of all ecosystems. Procedure. Water samples were …
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Spatial Distribution of Planktonic Copepoda and Cladocera in Red Rock Reservoir, Iowa, Summer, 1972
… of spatial distribution of Copepoda and Cladocera in Red Rock Reservoir, Iowa, summer, 1972, was undertaken. Water temperature, Secchi disk, and total water depth readings were also measured. Procedure. Volumetric samples of free-swimming zooplankton were collected at weekly intervals …
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Ocorrência, distribuição e reprodução de Cladocera (Crustacea: Branchiopoda) na Baía de Guanabara - RJ, Brasil
… distributions and reproduction of marine cladocerans in Guanabara Bay (Brazil). A seasonal analysis was made on the basis of samples obtained during 1985. Three areas were distinguished within Guanabara Bay: an external area (area A), being mainly influenced by oceanic waters; an internal …
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Spatial and Temporal Genetic Heterogeneity in a Natural Daphnia Population: Ecological and Physiological Differences Between Genotypes (Cladocera, Freshwater, Parthenogenesis)
… a population of the cyclically, parthenogenetic cladoceran, Daphnia pulex, inhabiting a permanent farm pond in east-central Illinois, indicated that electrophoretically distinct genotypes (clones) are frequently distributed non-randomly in the pond, both vertically and horizontally. Spatial …
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Paleo-Ecotoxicology of Yellowknife (Northwest Territories, Canada) Lakes Impacted by Historic Gold Mining Activities
… impacts of legacy arsenic contamination on Cladocera (Branchiopoda, Crustacea) from historic gold mining in Yellowknife lakes (Northwest Territories, Canada) using a paleo-ecotoxicological approach. I examined Cladocera subfossils preserved in the modern and pre-1850 lake sediments of 23 …
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Composition, Biomass, and Protein Content of a Lemna trisulca L., Invertebrate Community in a Prairie Wetland
… of duckweed in terms of biomass and density. Cladocera were the dominant microinvertebrates found in association with star duckweed. Significant variability was found in the biomass and densities of specific invertebrates with respect to sampling dates. Crude protein values of star …
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Ecologia do zooplâncton do reservatório de Tapacurá, Pernambuco-Brasil
… níveis em ambos os períodos sazonais. Rotifera, Cladocera e Copepoda foram os grupos mais freqüentes e abundantes. Entre o Rotifera, cinco espécies constituem novas ocorrências para ecossistemas continentais do estado de Pernambuco. A região litorânea revelou maior riqueza de espécies, …
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Prymnesium parvum effects on green algae, cladocerans and fish in field and laboratory studies.
… Pseudokirchinella subcapitata and a model cladoceran predator, Daphnia magna. Prymnesium parvum reduced D. magna survival and reproduction in laboratory and field studies, providing the first evidence of P. parvum impacts on cladocera. Nutrient treatment of N:P = 20 in the field decreased …
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Paleoenvironmentální rekonstrukce mladšího dryasu na základě subfosilních perlooček
… faktorů jsou subfosilní perloočky (Cladocera), které hrají v jezerních ekosystémech důležitou ekologickou roli. Jejich subfosilní zbytky deponované v sedimentu, mohou velmi dobře odrážet environmentální změny daného ekosystému. Cílem práce v rámci paleoenvironmentálního výzkumu …
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Physical and chemical correlates of Sacramento County vernal pool crustaceans
… species to emerge in large numbers. Ostracods, Cladocera and clam shrimp experienced large populations later in the season. Temperature showed strong correlations with most species and likely affected growth rates and emergence; conductivity, depth, and surface area were also positively …
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Ecologia de uma taxocenose de peixes anuais (Cyprinodontiformes - Rivulidae) num brejo de restinga, Barra de São João, Rio de Janeiro, Brasil
… small crustaceans (Copepoda, Ostracoda and Cladocera), Hydracarina and Rotifera. The results of feeding are discussed and compared with rivulid diets at other locations.
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Crustacea Zooplankton Communities in Icelandic Lakes Comparison Over Time
… in 19 Icelandic lakes, focusing on Copepoda and Cladocera. Zooplankton form a key trophic link in freshwater ecosystems, grazing on phytoplankton and serving as prey for higher trophic levels. Monitoring biodiversity in Arctic and sub-Arctic regions is particularly important given ongoing rapid …
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Fathead Minnows, Aquatic Invertebrates, and Mallard Duckling Interactions in Man-Made Ponds
… used plant foods. Chaoboridae, Amphipoda, Cladocera, Copepoda, and total macroinvertebrate catch were negetatively affected by minnow presence . Fewer Chironomidae, Baetidae, Ceratopogonidae, and Coenagrionidae were caught in stocked cells, but numbers were not significantly different. …
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The Vernal And Summer Zooplankton In Surface Waters From A Small Cove In Stockton Reservoir
… striking numerical changes with both the cladocera and copepod populations becoming less abundant from May to July. Some of the change may have been due to predation by larval fish. During 1975, zooplankton were most dense during May when larval fish were uncommon and were least dense in …
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Early Life History of Yellow Perch in Eastern South Dakota Lakes
… Copepoda by 7 mm total length (TL), and then to Cladocera and large calanoid Copepoda by 14-mm TL. However, in 1995, Copepoda nauplii density was extremely low and larvae began feeding on adult Copepoda at a much smaller TL. High proportions of empty stomachs (>40%) in 7- to 9-mm TL post-sac …
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