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Showing 1 to 20 of 39 for “"cladocerans"”.
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Prymnesium parvum effects on green algae, cladocerans and fish in field and laboratory studies.
… field decreased aquatic toxicity of P. parvum to cladocerans and fish. Whereas a potential relationship was observed between lower P. parvum related toxicity to fish, lower bacteria densities and fewer observations of P. parvum swarming behavior in laboratory studies, future studies are needed to …
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A Paleolimnological Investigation into the Ecological Impacts of Permafrost Thaw Slumping on Cladocerans (Branchiopoda, Crustacea) in the Mackenzie Delta Region (Northwest Territories, Canada)
… impacts of retrogressive thaw slumping on cladocerans (Branchiopoda, Crustacea) in Mackenzie Delta Region (Northwest Territories, Canada) lakes using paleolimnological techniques to answer the following questions: 1) Does thaw slumping increase UV exposure of Chydorus? 2) Are Daphnia absent …
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Food Selectivity of the Black Bullhead (Ictalurus melas, Rafinesque) in Lake Poinsett, South Dakota
… mm total length) fed primarily on limnetic cladocerans and copepods. Leptodora and Diaphanosoma comprised 86.5% of the total food volume. Chironomid larvae and pupae made up 5.6% of the total. Other benthic organisms and littoral cladocerans together contributed less than 1%. Stomach …
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Zooplankton response to Asian carp harvesting in Illinois River backwaters: a natural experiment
… densities of rotifers, nauplii, copepods, and cladocerans in ten backwaters receiving three levels of harvest in late summer of 2015. Analysis indicates that both harvest level and month affect zooplankton, but that there was no interaction. Rotifer densities increased at low (951 kg/km2 …
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Influence of Rainbow Smelt Predation on Zooplankton Community Composition in Lake Oahe, South Dakota
… The diet of adult rainbow smelt was dominated by cladocerans and also included low numbers of copepods and chironomid larvae and pupae. Adult rainbow smelt selected Daphnia pulex over other prey at all sampling stations. Other species positively selected for were Daphnia galeata mendotae and …
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The Effects of Ultraviolet-B Radiation on Aquatic Invertebrates
… dose (LD₅₀) values were determined for the cladocerans Ceriodaphnia reticulata, Scapholeberis kingii, and Daphnia magna, the ostracod Cyprinotus incongruens, and the amphipod Hyalella azteca. Among the species, 96-h LD₅₀ estimates were quite variable, ranging from 4.2 to 84.0 μW/cm². These …
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Reproduction, Body Condition and Dietary Variation of the Lesser Siren (Siren Intermedia)
… consuming a wide variety of prey taxa, although cladocerans were the predominant prey taxon in terms of frequency and total number. Sirens had the second lowest dietary niche breadth that has been estimated for any aquatic salamander, due in part to the disproportionate number of cladocerans. …
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Food Habits and the Utilization of Drift Organisms by Larval Fishes in the Middle Fork of Drake's Creek, Kentucky
… Micropterus sp. selected rotifers, annelids, cladocerans, and copepods during their first two weeks and annelids, cladocerans, and copepods during their last four weeks as larvae. Piscivory was observed in Micropterus, sp. during the third week of life with 12% of the meta-larvae consuming …
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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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Effects of an herbicide on a planktonic food web
… including ciliates, copepod nauplii, cladocerans and rotifers. Simazine decreased dissolved oxygen and pH, but increased nitrate and ammonia concentrations compared to control microcosms. A temporary decrease in temperature occurred at Week 1. Phytoplankton were differentially affected …
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Survival, Growth, Food Selection, and Alimentary Canal Development of Intensively Reared Walleyes and Yellow Perch
… feeding and was selected against thereafter; the cladocerans, Daphina magna and D. pulex, and the rotifer, Asplanchna sieboldi, were selected against by walleyes and yellow perch. Initially, significantly (P<.05) more organisms were ingested by walleyes collected at 1100 than at 2300 hours; after …
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The role of zooplankton - phytoplankton community interactions in the nutrient dynamics of Lake Chapala, Mexico.
… and/or excluded zooplankton. Six species of cladocerans were found in samples from Lake Chapala, with Ceriodaphnia pulchella as the most abundant. Only two species of copepods occurred, but they were more abundant than the cladocerans. The most frequently encountered species was Diaptomus …
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Growth and Metamorphosis of the Ringed Salamander
… Major food items consisted of copepods, cladocerans and dipteran larvae. Adult coloration was completed within two months after transformation.
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Alkyl Polyglucoside Compound Influences Freshwater Plankton Community Structure in Floating Mesocosms
… shift toward domination by small-bodied cladocerans (<em>Bosmina </em>sp.). Thus APG-induced decreases in DO availability, losses of autochthonous carbon production, and shifts from invertebrate predator (copepod) dominated communities to cladocerans has important implications for food …
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Food Habits of Fish In A Multispecies Farm Pond
… selected by adult black crappies, the smaller cladocerans were generally selected against.
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Limnology of Three Farm Ponds in South-Central South Dakota
… 75% of the total zooplankton, while cladocerans constituted 15%, and rotifer 10%.
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Food Habits of Black Crappies, White Crappies, Yellow Perch and White Suckers in a Small Impoundment in Northeastern South Dakota
… exhibit a distinct pattern in the selection of Cladocerans.</p>
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Predatory Impact of Exotic Cladoceran Cercopagis pengoi on the Zooplankton of Lake Ontario
… the rotifer Asplanchna priodonta and the cladocerans, Daphnia retrocurva, Bosmina longirostris, Ceriodaphnia lacustris, Scapheloberis kingi, and Leptodora kindtii. Between 1999 and 2001 decreases in the abundance of common members of the zooplankton community coincided with an increase in …
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Development of methodology for community level toxicity testing using the fathead minnow seven day survival-growth impairment test
… for culturing and toxicity testing of algae, cladocerans, a rotifer and two fish species. The next two papers address the substitution of the food source currently used in the fathead minnow survival-growth impairment test (<i>Artemia</i>) with a freshwater food source (the rotiter, …
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