Implications of hybridization between introduced and resident Orconectes crayfishes

Article Abstract:

The first genetic documentation of hybridization between a resident and invading Orconectes Crayfish is studied using morphological and allozyme comparisons of crayfish from allopatric and sympatric populations. The results show that the genetic mechanisms play a major role in the extirpation of O.propinquus by O.rusticus and are consistent with observations of other researchers suggesting that hybridization with non-native species is common among crayfishes at many locations.

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Economic geography, forest distribution, and woodpecker diversity in Central Europe

Article Abstract:

Woodpecker diversity shows a negative correlation with urbanization in a study of 20 central European countries. Treating woodpecker diversity as an indicator of biodiversity, a causal link is supported between biodiversity declines and landscape degradation associated with technological development. Woodpecker species that depend on temperate forests are especially vulnerable to human-generated ecological changes.

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Nonindigenous species: ecological explanation, environmental ethics and public policy

Article Abstract:

Invasive species are the subset of nonindigenous species, which cause economic and environmental damage. A lot of misunderstanding and tension is prevailing regarding the science, values, environmental ethics, and public policy relevant to invasive species and the development of widely applicable risk-assessment protocol is a major challenge.

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