The chromosomes of the Mediterranean killifish, Aphanius fasciatus from two populations, the Lagoon of Venice (LV, 15 specimens) and the Lagoon "Stagnone di Marsala" (Sicily) (SM, 48 specimens), have been investigated using conventional Ag-staining and fluorescent in situ hybridization (FISH) with 18S rDNA probe. The two methods revealed variation in the number of major rDNA sites ranging from ...

-An evaluation is reported of methods used to prepare mosses for analysis when required for monitoring metal pollution. Fontinalis antipyretica and Rhynchostegium riparioides taken from the River Ho~gne, Belgium, were used for the study. The stages in preparation studied critically were the storage of the moss after it had been collected from the river, washing, choice of which particular fract...

Age.?Minimum, 18 ; maximum, 34; average, 233. Presentation.?Vertex, 30 ; pelvic, 2 ; face, 1. Position.?Left occipitoanterior, 23 ; right occipito-posterior, 5 ; right occipitoanterior, 2; left mento-auterior, 1; left sacroanterior, 1; right sacro-posterior, 1. Duration of Labour.?First stage: Minimum, 4 h. 30 m.; maximum, 62 h.; average, 15 h. 5 m. Second stage : Minimum, 25 m.; maximum, 6 h.:...

Sağlam et al. recently argued that the Devil's Hole pupfish (Cyprinodon diabolis), a conservation icon with the smallest known species range, was isolated 60 kya based on a new genomic data set. If true, this would be a radically long timescale for any species to persist at population sizes <500 individuals, in contrast to conservation genetics theory. However, here we argue that their analyses...

A substantial number of species within the tooth-carp Aphanius Nardo, 1827 (Cyprinodontidae, Teleostei) has been recorded from the endorheic drainage systems of Iran, and several isolated populations in these systems may deserve species status. Descriptions of these species and populations have been based mainly on morphological and molecular data; however, the characters related to the fish sc...