Results 181 to 190 of about 5,195 (227)
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Cladoceran assemblages in a mineralization gradient
Hydrobiologia, 2001Cladoceran assemblages were studied in littoral samples from 44 water bodies in Central Spain, showing great differences in salinity and permanence of water. Principal component analyses (PCA) were performed with data on cladoceran relative abundances to identify the main groups of species. Five main groups of species were found, defining the following
Loles Boronat +2 more
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STATISTICAL ANALYSIS OF THE CLADOCERAN REPRODUCTIVITY TEST
Environmental Toxicology and Chemistry, 1986AbstractThe data from a renewal toxicity test are awkward to interpret if some of the adult organisms die during the experiment. The usual summary statistic is the mean number of young produced per adult, but when some adults die, the mean can be defined in two different ways, the mean overall (MOA) and the mean ignoring mortality (MIM).
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Comparative phylogeography of marine cladocerans
Marine Biology, 2008We examined the population genetics of six species of marine cladocerans, using a ~600 bp fragment of the cytochrome oxidase subunit I gene sequence. Phylogenetic analysis revealed significant intraspecific, semi-allopatric phylogenetic breaks in four out of five species belonging to the Podonidae, supporting an ancient radiation and oceanic expansion ...
Alan Durbin +2 more
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The penetration of cladocerans into saline waters
Hydrobiologia, 1993Cladocerans are essentially freshwater organisms, many of which have been able to penetrate slightly saline waters (up to 5% salinity), both thalassic and athalassic, some of which occur at higher salinities, and a few of which, mostly non-chydorids, penetrate still higher salinities (15—30% and even higher) and may be confined to these salinities ...
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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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Apus and a Rare Cladoceran in Britain
Nature, 1948THE primitive crustacean known as apus, or Triops cancriformis (Bosc), which is of particular interest to zoologists, has only been recorded five times in Britain. It was found in 1738 in Kent1, at the beginning of last century near Christchurch in Hampshire2, a little later at Bristol3, in 1907 in Kirkcudbrightshire4, and in 1934 near Fordingbridge in
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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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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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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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