Falniowski kozik (2 risultati)
Da: ConchBooks, Harxheim, GermaniaConchBooks
Contatta il venditoreVenditore con 4 stelleCondizione: Usato
EUR 5,75
EUR 24,00 spedizioneSpedito da Germania a U.S.A.Quantità: 1 disponibili
Aggiungi al carrelloDuring a morphological/electrophoretic study on the European Viviparidae, a hybrid but fertile female specimen (Viviparus contectus (Millet, 1813) times V. viviparus (Linnaeus, 1758)) was found in the Niepolomice Forest, South Poland. The specimen showed intermediate characters in its shell, anatomy, and embryonic shell. Polyacr…ylamide gel electrophoresis of that specimen confirmed its hybrid origin, which was marked in eight enzyme systems: specific homozygotes in both species along with a typical heterozygote in the hybrid. Interspecific differences in allozyme pattern, with different alleles in at least one locus in most enzyme systems studied, seem to indicate that V. contectus and V. viviparus are very old species, and their isolating mechanisms preventing hybridization could have become not efficient enough after such a long time since the speciation event. This is all the more probable, now that they occur sympatrically very rarely. 4 pp., 4 figs, 4.
Da: ConchBooks, Harxheim, GermaniaConchBooks
Contatta il venditoreVenditore con 4 stelleCondizione: Usato
EUR 6,21
EUR 24,00 spedizioneSpedito da Germania a U.S.A.Quantità: 1 disponibili
Aggiungi al carrello18 pp., 7 figs, geh. gr. 8.