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The age of island-like habitats impacts habitat specialist species richness.
MedLine Citation:
PMID:  22764496     Owner:  NLM     Status:  In-Process    
Abstract/OtherAbstract:
While the effects of contemporaneous local environment on species richness have been repeatedly documented, much less is known about historical effects, especially over large temporal scales. Using fen sites in the Western Carpathian Mountains with known radiocarbon-dated ages spanning Late Glacial to modern times (16 975-270 cal years before 2008), we have compiled richness data from the same plots for three groups of taxa with contrasting dispersal modes: (1) vascular plants, which have macroscopic propagules possessing variable, but rather low, dispersal abilities; (2) bryophytes, which have microscopic propagules that are readily transported long distances by air; and (3) terrestrial and freshwater mollusks, which have macroscopic individuals with slow active migration rates, but which also often possess high passive dispersal abilities. Using path analysis we tested the relationships between species richness and habitat age, area, isolation, and altitude for these groups. When only matrix-derived taxa were considered, no significant positive relation was noted between species richness and habitat size or age. When only calcareous-fen specialists were considered, however, habitat age was found to significantly affect vascular plant richness and, marginally, also bryophyte richness, whereas mollusk richness was significantly affected by habitat area. These results suggest that in inland insular systems only habitat specialist (i.e., interpatch disperser and/or relict species) richness is influenced by habitat age and/or area, with habitat age becoming more important as species dispersal ability decreases.
Authors:
Michal Horsák; Michal Hájek; Daniel Spitale; Petra Hájková; Daniel Díte; Jeffrey C Nekola
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Ecology     Volume:  93     ISSN:  0012-9658     ISO Abbreviation:  Ecology     Publication Date:  2012 May 
Date Detail:
Created Date:  2012-07-05     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0043541     Medline TA:  Ecology     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1106-14     Citation Subset:  IM    
Affiliation:
Department of Botany and Zoology, Masaryk University, Kotlárská 2, CZ-611 37 Brno, Czech Republic. horsak@sci.muni.cz
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