Download Cladocera as Model Organisms in Biology: Proceedings of the by Klaus Schwenk, Andrea Ender, Bruno Streit (auth.), Petter PDF

By Klaus Schwenk, Andrea Ender, Bruno Streit (auth.), Petter Larsson, Lawrence J. Weider (eds.)

The 3rd foreign Symposium on Cladocera, papers from which make up this quantity, lined contemporary findings at the behaviour, existence background, inhabitants genetics, copy, chemical conversation, predator-prey interactions, epibionts, taxonomy, phylogeny, palaeolimnology and biogeography of this animal staff.
The Cladocera occupy an intermediate place in lake ecosystems, either as plankton and benthic organisms. Their frequently excessive abundance and their functionality, as move organisms from algae and lifeless natural topic to macro-invertebrates and fish, lead them to the most vital organisms to impact the organic tactics in freshwater ecosystems. The Cladocera residing one of the plankton usually have recognizable distribution styles and migrations; their dimension and short existence cycles lead them to well known in laboratory experiments; their cyclic parthenogenesis makes them appropriate for lots of points of inhabitants genetics; and they're current as microfossils in lake sediments. these kinds of gains confer a distinct prestige at the Cladocera as version organisms in lots of facets of contemporary systematics and ecology.

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Extra info for Cladocera as Model Organisms in Biology: Proceedings of the Third International Symposium on Cladocera, held in Bergen, Norway, 9–16 August 1993

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Allele and genotype frequencies Two alleles, F and S, were present at the AO locus. Allele S had a frequency of 60% in August, 74% in September and 95% in November. In the April samples the frequency of S, 64%, was similar to that of the preceding August (Fig. 4). Similarly, two alleles, F and 20 Aug II Table 2. F coefficients for each allozyme locus averaged over the individual collections (F IS) and for the pooled data from the four collections (FIT). Negative values indicate departures from random recombination in the direction of heterozygote excesses.

F coefficients for each allozyme locus averaged over the individual collections (F IS) and for the pooled data from the four collections (FIT). Negative values indicate departures from random recombination in the direction of heterozygote excesses. 44 0 Q . 2 Sample size (no. 84 Table 4. Comparisons of the genetic distance (D) and genetic identity (I) between the clones in the four collections. D is presented above the diagonal, I below the diagonal. 27 o Apr 0 . " '. ~ (I; s~ • 55 .. ) .. ) (-) ( ( ..

Because there was also a decrease of phytoplankton production and shift in dominance of the algal groups between our September and November collections, it is clear that there are a number of environmental factors that could account for the observed density reduction and changes in the age structure of the Daphnia population. The April D. longispina population had a low density, but both mean brood size and fecundity rates were quite high (Table 1). Curiously, the April population also had the highest proportion of males we observed.

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