Evidence for local outbreeding depression in the Mediterranean island endemic Anchusa crispa Viv. (Boraginaceae)

Article Abstract:

Outbreeding depression may be in effect on a very local scale within populations of the rare endemic species Anchusa crispa Viv., and important implications for rare plant conservation exist. The species is endemic to a Mediterranean island and has no spatial or temporal floral mechanism that would be helpful to outcrossing. Populatinos are completely homozygous and fixed for single, sometimes different, alleles at several loci.

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Species-wide homogeneity of nuclear ribosomal ITS2 sequences in the spider mite Tetranychus urticae contrasts with extensive mitochondrial COI polymorphism

Article Abstract:

Geographical variation in the mitochondrial cytochrome oxidase I gene (COI) and the second nuclear ribosomal internal transcribed spacer (ITS2) in the spider mite Tetranychus urticae Koch, a cosmopolitan pest that damages various crops, are discussed. Specieswide homogeneity of nuclear ribosomal ITS2 sequences is seen in the mite, in contrast to extensive mitochondrial COI polymorphism.

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Floral variation and style-morph ratios

Article Abstract:

Floral variation and style-morph ratios are discussed relative to evolution and maintenance of stigma-height dimorphism in Narcissus, a genus of insect-pollinated Mediterranean geophyte. Biased style-morph ratios for the most part come from morph-specific differences in assortative mating.

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