1,720,988 research outputs found
Preliminary research on species distribution of planktonic Ostracods (Halocyprididae) in the Ross Sea, Antarctica
No full textSystematic account off Ostracoda species. In: Moroni A. & McKenzie K.G. (Eds) "Ostracoda of the Italian Ricefield Ecosystems"
No full text
Variazioni temporali delle frequenze geniche in Heterocypris incongruens (Crustacea, Ostracoda).
No full text
Genetic structure of Austrian and Italian populations of Limnocythere inopinata (Crustacea, Ostracoda): a potential case of a post-glacial parthenogenetic invader?
No full textSeveral hypotheses were proposed to account for geographic parthenogenesis that is the disjointed distribution of a species’ sexual and asexual forms. In the areas affected by glaciations the parthenogenetic forms would have had ecological success and
hybridization and polyploidy would have been the driving forces in their success.
Limnocythere inopinata is well-represented in Quaternary non-marine sequences and is useful for studying the evolution of geographic parthenogenesis. We analysed the genetic variability of twelve populations from sub alpine Italian lakes, Austrian lakes
and a pond, in an area that was covered by ice during the Pleistocene. In all samples we found only parthenogenetic females. Using allozymes, we described at least 33 different
clonal lineages in the total of 812 females. We found no evidence for polyploidy.
Clonal diversity is relatively high and may reflect the genetic diversity of ancestral sexual metapopulations. In L. inopinata, geographical parthenogenesis seems the result of historical and ecological factors and is not linked to polyploidy and hybrid
advantage
Interferenza dell'infiammazione da poliestere con lo svilupp dell'epatoma-ascite di Yoshida nel ratto
No full textGeographic patterns of clonal diversity in Heterocypris incongruens (Crustacea: Ostracoda) in Northern Italy ricefields.
No full text- …
