By Klaus Schwenk, Andrea Ender, Bruno Streit (auth.), Petter Larsson, Lawrence J. Weider (eds.)
The 3rd overseas Symposium on Cladocera, papers from which make up this quantity, coated fresh findings at the behaviour, existence heritage, inhabitants genetics, copy, chemical communique, predator-prey interactions, epibionts, taxonomy, phylogeny, palaeolimnology and biogeography of this animal workforce.
The Cladocera occupy an intermediate place in lake ecosystems, either as plankton and benthic organisms. Their usually excessive abundance and their functionality, as move organisms from algae and lifeless natural topic to macro-invertebrates and fish, lead them to probably the most very important organisms to impact the organic methods in freshwater ecosystems. The Cladocera dwelling one of the plankton usually have recognizable distribution styles and migrations; their measurement and short existence cycles lead them to well known in laboratory experiments; their cyclic parthenogenesis makes them compatible for lots of elements of inhabitants genetics; and they're current as microfossils in lake sediments. a majority of these positive factors confer a different prestige at the Cladocera as version organisms in lots of facets of recent systematics and ecology.
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Additional info for Cladocera as Model Organisms in Biology: Proceedings of the Third International Symposium on Cladocera, held in Bergen, Norway, 9–16 August 1993
D is presented above the diagonal, I below the diagonal. 27 o Apr 0 . " '. ~ (I; s~ • 55 .. ) .. ) (-) ( ( .. ) (.. ) '~MF SF r Coo ) MIA ,~/ / .. , I (. : ~~ .. ~ ·r (oo ) ( .. $M SS ) Fig. 5. Observed and expected (Hardy-Weinberg) genotype frequencies for each locus and collection. 05) differences are indicated by '(or. '\, (-) Table 3. Clone number, diversity and frequencies in the four collections. Composite electromorph identifications are presented in the order AO genotype - PGI genotype - PGM genotype.
Materials and methods Life history experiments were performed with several clones from one brackish and one freshwater habitat, both located near PIOn in northern Germany. The experimental clones were obtained from ephippia from sediment samples and are therefore representatives of the clone banks of each population. Since ephippia were produced sexually (un pub!. enzyme electrophoresis data), all clones differ in genotype. The brackish lake GroBer Binnensee was characterized by a fluctuating level of salinity due to a connection with the Baltic Sea, before 1991.
Cucullata being the mother (Schwenk, 1993). D. cucullata females and D. galeata males coexist in the Neuhofener Altrhein (Bast, 1993): ephippiabearing D. cucullata females and D. galeata males coexisted during four out of the 26 months studied. 3% of the total popUlation of both species with a mean sex ratio of two females to one male. On the other hand, no D. cucullata males were observed in the Neuhofen- er Altrhein, thus there is no evidence for potential hybridization in the other direction.