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The diversity and distribution of diatoms: from cosmopolitanism to narrow endemism
Vanormelingen, P.; Verleyen, E.; Vyverman, W. (2008). The diversity and distribution of diatoms: from cosmopolitanism to narrow endemism. Biodivers. Conserv. 17(2): 393-405. dx.doi.org/10.1007/s10531-007-9257-4
In: Biodiversity and Conservation. Kluwer Academic Publishers/Springer: London. ISSN 0960-3115, more
Peer reviewed article  

Available in  Authors 
    VLIZ: Open Repository 279065 [ OMA ]

Keyword
    Bacillariophyceae [WoRMS]
Author keywords
    biogeography; diatoms; dispersal; diversity; endemism; macroecology;microorganisms; ubiquity hypothesis

Authors  Top 
  • Vanormelingen, P., more
  • Verleyen, E., more
  • Vyverman, W., more

Abstract
    It has been claimed that microbial taxa will not exhibit endemism because their enormous populations remove dispersal as an effective constraint on geographical range. Here we review evidence that challenges this ubiquity hypothesis for the most speciose group of microbial eukaryotes, the diatoms. Detailed taxonomic inventories using fine-grained morphological characteristics, molecular markers, and crossing experiments have revealed that the geographic distribution of diatoms ranges from global to narrow endemic. Records of human-mediated introductions of exotic species further provide a strong indication that geographic dispersal was limiting in the past. Finally, recent studies have revealed that diatom community structure and diversity are influenced by geographical factors independent of environmental conditions. Diatom communities are thus regulated by the same processes that operate in macro-organisms, although possibly to a different degree, implying that dispersal limitation is significant and the endemism observed in isolated areas is real. These results underscore the pressing need to (1) continue research into diatom biology, ecology and the factors driving diatom species diversity and geographic distributions, and (2) protect relatively isolated areas against further introductions of exotic species.

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