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  • Cited by 4
  • Print publication year: 2011
  • Online publication date: August 2012

15 - Microbes as a test of biogeographic principles

from Part V - Processes

Summary

Introduction

In the hierarchy of scientific knowledge, a principle, rule or law describes consistent observations and precedes hypothesis and theory. Given consistent observations, other information or insight may suggest mechanisms, and a hypothesis can be formed. For example, the first principle of biogeography, Buffon's law, states that disjunct regions have distinct species assemblages despite similar environments. Buffon proposed a mechanism to explain biogeographic patterns: that species ‘improve’ or ‘degenerate’ according to their environment. Given generality and often incorporating multiple facets, a theory may emerge that explains the patterns well (e.g. evolutionary theory).

As in ecology, biogeographic principles may include speculations that ‘have often been elevated to laws merely by the passing of time’ (Loehle, 1987). Tests of biogeographic laws/principles/rules are thus valuable for biogeography in general and for understanding the tested system.

In that context, the statement for microbes that ‘Everything is everywhere, but the environment selects’ (Finlay, 2002; de Wit and Bouvier, 2006; hereafter abbreviated as EiE) is valuable to test the generality of biogeography's principles and their hypothesised mechanisms. Generality is tested best by extremes, and microbes (defined here as < ~1–2 mm; Finlay, 2002) certainly represent the lower margin of body size for most biogeographic evidence because most biogeography research has been conducted with macrobes (defined here as larger than 1–2 mm; Finlay, 2002). According to EiE, microbes have no biogeographic pattern due to their enormous population sizes and high probability of ubiquitous dispersal (Finlay, 2002).

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