Results 191 to 200 of about 6,143 (232)
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CARDIAC PHARMACOLOGY OF THE CLADOCERAN, DAPHNIA
The Biological Bulletin, 19421. Acetylcholine was found to have a depressing effect on the heart rate and strength of beat of the heart of Daphnia magna with the threshold at 10-9 and a depression of 25 per cent at 10-5 The effect is reversible.2. Atropine has a depressing effect on the heart rate with the threshold at 10-7 and an inhibition of 15 per cent at 10-4 The effect is ...
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Evolutionary and ecological consequences of interspecific hybridization in cladocerans
Experientia, 1995The evolutionary process of interspecific hybridization in cladocerans is reviewed based on ecological and population genetic data. The evolutionary consequences of hybridization, biogeographic patterns and fitness comparisons are analyzed within the conceptual framework of theories on hybridization. Among species of the D.
Schwenk, K., Spaak, P.
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Turbidity mitigates lead toxicity to cladocerans (Cladocera)
Ecotoxicology, 2006To test the hypothesis that sediment would have a synergistic effect on the toxicity of lead to cladocerans, we performed life table demography experiments with two pelagic (Diaphanosoma birgei and Moina micrura) and one littoral (Alona rectangula) cladoceran species.
Gerardo, García-García +2 more
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Egg‐Size Cycle of a Cladoceran
Ecology, 1974The cladoceran Bosmina Longirostris undergoes a peculiar egg—size cycle in Frains Lake. Females carry small eggs during summer, then switch to large eggs in late fall, in the process more than doubling the enclosed yolk volume. Winter generations mature at larger sizes, then shift to small eggs in early spring.
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Variation in, and Causes of, Toxicity of Cigarette Butts to a Cladoceran and Microtox
Archives of Environmental Contamination and Toxicology, 2005Cigarette butts are the most numerically frequent form of litter in the world. In Australia alone, 24-32 billion cigarette butts are littered annually. Despite this littering, few studies have been undertaken to explore the toxicity of cigarette butts in aquatic ecosystems. The acute toxicity of 19 filtered cigarette types to Ceriodaphnia cf. dubia (48-
Micevska, T. +3 more
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2014
Cladocerans are valuable indicators of environmental change in lakes. Their fossils provide information on past changes in lake environments. However, few studies have quantitatively examined the relationships between contemporary and sub-fossil cladoceran assemblages and no investigations are available from Mediterranean lakes where salinity ...
Çakıroğlu, Idil +8 more
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Cladocerans are valuable indicators of environmental change in lakes. Their fossils provide information on past changes in lake environments. However, few studies have quantitatively examined the relationships between contemporary and sub-fossil cladoceran assemblages and no investigations are available from Mediterranean lakes where salinity ...
Çakıroğlu, Idil +8 more
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The Evolution of Cladoceran Life Histories
The Quarterly Review of Biology, 1980The selection pressures imposed by invertebrate are of primary significance in the evolution of cladoceran life histories. Small-sized cladoceran species are vulnerable to invertebrates throughout their lives, but minimize the adverse effects of juvenile mortality by producing relatively large offspring, which reach maturity at an early age.
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Reproductive Biology of Marine Cladocerans
1997Publisher Summary The chapter discusses the reproductive biology of marine cladocerans. Marine cladocerans are seasonally abundant and widely distributed in continental shelf waters, estuaries, the open ocean, the Baltic, the Mediterranean, and inland seas.
David A. Egloff +2 more
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Balancing Predation and Competition in Cladocerans
Ecology, 1974A graphic model is proposed relating the balance between predation and competition to size strategies and species richness in zooplankton communities. As decreasing survivorship, due to predation, and increasing food—collecting ability are arranged along the single dimension of body size, both may be specified clearly.
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Copepod and cladoceran success in an oligotrophic lake
Journal of Plankton Research, 1984Bosmina longirostris (cladocene) est fortement limite temporellement et spatialement par la predation dans le lac Tahoe (Nevada-Californie); par contraste, Diaptomus tyrrelli (copepode) n'est pas notablement limite par les predateurs.
Earl R. Byron +2 more
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