Geographical range margins of many taxonomic groups continue to shift polewards

Advocacy groups continue to scorn screening guidelines.

Body Size, Growth and Life Span: Implications for the Polewards Range Shift of Octopus tetricus in South-Eastern Australia

Understanding the response of any species to climate change can be challenging. However, in short-lived species the faster turnover of generations may facilitate the examination of responses associated with longer-term environmental change. Octopus tetricus, a commercially important species, has undergone a recent polewards range shift in the coastal waters of south-eastern Australia, thought t...

Living on the Edge: Roe Deer (Capreolus capreolus) Density in the Margins of Its Geographical Range

Over the last decades roe deer (Capreolus capreolus) populations have increased in number and distribution throughout Europe. Such increases have profound impacts on ecosystems, both positive and negative. Therefore monitoring roe deer populations is essential for the appropriate management of this species, in order to achieve a balance between conservation and mitigation of the negative impact...

Slow Tourism at the Caribbean’s Geographical Margins

The Caribbean tourism industry owes much of its success to beneficial geograph­ ical site and situation factors. Yet these geographical advantages have also contributed to the mass tourism-related pressures of economic dependency, social division and environmental degradation. We argue geographically marginal locales in the Caribbean have the potential to develop alternative tourism models that...

On solubility of groups with finitely many centralizers

For any group G, let C(G) denote the set of centralizers of G.We say that a group G has n centralizers (G is a Cn-group) if |C(G)| = n.In this note, we prove that every finite Cn-group with n ≤ 21 is soluble andthis estimate is sharp. Moreover, we prove that every finite Cn-group with|G| < 30n+1519 is non-nilpotent soluble. This result gives a partial answer to aconjecture raised by A. Ashrafi in ...