Il confronto cariologico tra le due specie gemelle Tisbe reluctans e Tisbe persimilis ha messo in luce l'esistenza di differenze nella lunghezza dei cromosomi, nella posizione del centromero e nella morfologia dei bivalenti della meiosi spermatocitaria. La differenza di lunghezza rilevata tra cromosomi mitotici e meiotici viene in terpretata come un fenomeno di riduzione di cromatina.
Genetic load in Tisbe (Copepoda, Harpacticoida). II. T. holothuriae and T. bulbisetosa from the lagoon of Venice. Two populations of Tisbe holothuriae coming from two lagoon localities different as to their environmental heterogeneity but similar in their environmental variability, have been examined. The first station is located near Alberoni at a distance of about 3 kilometers from the sea; the second one is toward the inner part, near Malamocco, at about 6 kilometers from the open sea. The benthic...
Two populations of Tisbe holothuriae, coming from marine (Banyuls-sur-mer) and brackish waters (Sigean), have been analyzed before and after progressive inbreeding. It has been shown that an increase of the homozygosity due to inbreeding determines in both populations a progressive depression of survival, fecundity, mean generation time and intrinsic rate of natural increase. The inbreeding depression is higher in the marine population. The concealed genetic variability, estimated on the basis of...
The diploid chromosome number 2 n = 16 has been established in both sexes of the harpacticoid copepod Tisbe biminiensis. The chromosomes are metacentric or sub-metacentric, and differentiated sex chromosomes are not present. Chiasmatic metaphase bivalents occur in the male. In the female, after the diffuse stage the homologues separate but remain juxtaposed to each other till metaphase I. The diploid chromosome numbers so far reported for species of the genus Tisbe are 24. The phylogenetic meaning...
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