Document Detail

Apparent global ubiquity of species in the protist genus Paraphysomonas.
MedLine Citation:
PMID:  10714775     Owner:  NLM     Status:  MEDLINE    
Evidence is presented for the ubiquity of protist species. Using the example of protists that leave traces (siliceous scales) of their recent population growth, we show that most - perhaps all species in the genus Paraphysomonas, are ubiquitous. Of the species recorded in surveys carried out worldwide, we have identified 78% of their number in 0.1 cm2 of sediment collected from a freshwater pond (total area 10(8) cm2) in England. Moreover, the pond appears to act like a microcosm of aquatic environments in general, for species that are globally rare or abundant, are likewise rare or abundant in the pond. We assume that the rate of neutral migration to the pond is greatest for the globally abundant species. As these species are probably capable of growth in a broad range of conditions, they will more frequently encounter the environment they require for population growth. Thus globally abundant species are also locally abundant in the pond - a pattern that will be amplified by periodic cyst production. Ubiquitous dispersal is probably driven by very high absolute abundance of individuals, and the water column of the pond was estimated to support >10(14) Paraphysomonas individuals. Ubiquity will dampen rates of speciation, and the evidence presented here indicates that global species richness of Paraphysomonas is indeed modest - perhaps close to what is already known.
B J Finlay; K J Clarke
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Protist     Volume:  150     ISSN:  1434-4610     ISO Abbreviation:  Protist     Publication Date:  1999 Dec 
Date Detail:
Created Date:  2000-04-14     Completed Date:  2000-04-14     Revised Date:  2000-12-18    
Medline Journal Info:
Nlm Unique ID:  9806488     Medline TA:  Protist     Country:  GERMANY    
Other Details:
Languages:  eng     Pagination:  419-30     Citation Subset:  IM    
Institute of Freshwater Ecology, Windermere Laboratory, The Ferry House, Ambleside, Cumbria, UK.
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MeSH Terms
Diatoms / classification,  isolation & purification*
Fresh Water
Species Specificity

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