Multi-species risk analysis, species evaluation and biodiversity conservation.

The multi-species conservation approaches starting from Vane-Wright et al. (1991) search for a biologically valid basis to evaluate biodiversity. Such evaluations can be used to optimize reserve boundaries so reserves contain a high level of biodiversity.

A NEW MEASURE OF GENETIC IDENTITY BETWEEN POPULATIONS OF SEXUAL AND ASEXUAL SPECIES.

We define a new genetic identity measure that is especially well suited for asexual polyploid species as it circumvents errors in the estimation of gene frequencies. It also can be applied to sexuals allowing the study of phylogenetic relationships in species complexes consisting of sexuals and asexuals of different ploidy levels. The measure groups genotypes into classes dependent on homozygosity vs heterozygosity and the number of ancestral allele types vs the number of presumed new mutations.

Allozyme variation in rye, Secale cereale L. : 2. Commercial varieties.

Eleven samples of eight European commercial varieties of winter rye were examined at eight polymorphic enzyme loci. Genotype frequencies fitted Hardy-Weinberg expectations at all loci in all samples studied. Of the total genetic diversity recorded at the 8 loci, only 7% was expressed between varieties.

Evolution and intraspecific exploitative competition. II. A two-locus model for additive gene effects.

A two-locus model corresponding to the model of Christiansen and Loeschcke (1980, theoret, Popul. Biol. 18, 297-313) is analysed.

Analysis of intercellular distributions of chromatid aberrations.

59 intercellular distributions of chemically induced and spontaneous chromatid aberrations were analyzed for goodness of fit in respect of the Poisson (PD), the geometrical (GD), and the negative binomial distributions (NBD). The data are excellently described by the NBD. This distribution can be deduced from a model out of the queueing theory and is based on the hypothesis of restitution.