Results 171 to 180 of about 13,377 (210)

The Evolution of Cladoceran Life Histories

The Quarterly Review of Biology, 1980
The 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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Egg‐Size Cycle of a Cladoceran

Ecology, 1974
The 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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Dissolved humic substances initiate DNA-methylation in cladocerans

Aquatic Toxicology, 2011
DNA-methylation is one pathway of epigenetic programming of gene expression and can be responsive to environmental challenges such as methylating agents in the food. Here we report on the DNA-methylation in the cladocerans Daphnia magna and Moina macrocopa exposed to humic substances, ubiquitous biogeochemicals.
Stefanie, Menzel, Rihab, Bouchnak, Ralph, Menzel, Christian E W, Steinberg   +3 more
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Miniature genomes and endopolyploidy in cladoceran crustaceans

Genome, 1989
The haploid genome sizes (0.37 and 0.47 pg) of two members of the cladoceran crustacean genus Daphnia rank among the smallest known for Crustacea. An examination of cladoceran somatic tissues by scanning microdensitometry revealed abundant endopolyploidy in both species.
Margaret J. Beaton, Paul D. N. Hebert
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Some suggestions for future cladoceran research

Hydrobiologia, 1997
The topics dealt with at the Cladoceran Symposium showed a large diversity. A high diversity is what characterises the world we study, consisting of many different habitats and a rich species set. This easily leads to anecdotal research which then prevents the building of a consistent and sophisticated body of knowledge.
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Cladoceran males from the Indian region

1995
(Uploaded by Plazi from the Biodiversity Heritage Library) No abstract provided.
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Lateral compression and visibility in cladocerans

Limnology and Oceanography, 1981
A simple mathematical model suggests that lateral compression affects a cladoceran’s visibility to fish. The results of a simple test using the lengths and widths of cladocerans suggest that handling by copepods probably does not exert any significant selection on lateral compression in cladocerans, but fish gill rakers and visibility to fish might ...
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The penetration of cladocerans into saline waters

Hydrobiologia, 1993
Cladocerans 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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cladoceran, n.

2023
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Apus and a Rare Cladoceran in Britain

Nature, 1948
THE 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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