Biodiversity and Conservation

, Volume 17, Issue 2, pp 329–343

Diversity and biogeography of testate amoebae

  • Humphrey Graham Smith
  • Anatoly Bobrov
  • Enrique Lara
Original Paper

DOI: 10.1007/s10531-007-9260-9

Cite this article as:
Smith, H.G., Bobrov, A. & Lara, E. Biodivers Conserv (2008) 17: 329. doi:10.1007/s10531-007-9260-9

Abstract

Testate amoebae are amoeboid protists inhabiting a test (shell). They occur globally in soils, wetlands and freshwater, especially peats and mosses. They are of ancient origin, dating from at least the Mesozoic, with possible ancestors as old as the Neoproterozoic. Approximately 2,000 taxa have been described—a number which could easily rise to 4,000 with comprehensive recording. Whilst many protists appear to be cosmopolitan as morphospecies, some of the larger testate species (exceeding 100 μm) have long been considered, controversially, to be geographically restricted. Definitive conclusions have often been confounded by gaps in distributional data and misidentification. Recent increases in recording from previously little known regions, and the rise of molecular taxonomy, have started to resolve outstanding issues—processes still far from complete. Accordingly, biogeographical studies have concentrated on “flagship” species—those which can be identified with certainty and are sufficiently recorded to determine their ecological ranges. Apodera vas (Certes) has been proved to be largely restricted to the Gondwanaland continents and sub-Antarctic islands, but absent from the Holartic despite the availability of much suitable habitat. An early analysis postulated a Mesozoic origin of the species and a distribution influenced by continental drift. Recent molecular evidence could imply a later origin. Either way, its current distribution is clearly influenced by the pattern of global wind currents and lack of lowland tropical habitat. By contrast a “Gondwana-tropical” group of species appears to be restricted to latitudes unaffected by glaciation. Instances of local endemism, such as restriction to a single island, are also known, which await molecular evidence for substantiation.

Keywords

BiogeographyCosmopolitanismDiversityEcologyEndemismFlagship speciesFossil testatesTestate amoebae

Copyright information

© Springer Science+Business Media B.V. 2007

Authors and Affiliations

  • Humphrey Graham Smith
    • 1
  • Anatoly Bobrov
    • 2
  • Enrique Lara
    • 3
  1. 1.Environmental SciencesCoventry UniversityCoventryUK
  2. 2.Faculty of Soil ScienceMoscow State UniversityMoscowRussia
  3. 3.Wetlands Research GroupSwiss Federal Research Institute WSLEcublensSwitzerland