from Part I - Ancient invaders
Published online by Cambridge University Press: 05 February 2014
Introduction
This book is primarily concerned with how species colonise and invade new areas. It examines the evidence relevant to a suite of hypotheses concerning processes that occur on present-day populations in present-day landscapes. This chapter takes an approach different to that of many other chapters. Before examining the main hypotheses, it begins by exploring how the deeper evolutionary history of any species will inform design of research into that species’ ecology, behaviour and present distribution. The ecological and behavioural hypotheses one might test to describe the evolution of species in their current geographical and ecological ranges will depend on tests of relevant phylogenetic hypotheses about a species – its systematics. For example, only from a phylogenetic analysis can it be understood whether a species is part of relatively species-diverse or species-poor clades. So, too, in this way can it be best understood whether it shares an ecological trait with other species because it is closely related to them, or because the trait has arisen multiple times, or has been retained from a relatively distance ancestor. In the context of this book, this might usefully be seen as an ecological and behavioural view of historical biogeography, or how clarifying the past is the first step to fully understanding the present.
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