NDLI: Evidence for dispersal and habitat controls on pond diatom communities from the McMurdo Sound Region of Antarctica

Content Provider	Springer Nature Link
Author	Sakaeva, A. Sokol, E. R. Kohler, T. J. Stanish, L. F. Spaulding, S. A. Howkins, A. Welch, K. A. Lyons, W. B. Barrett, J. E. McKnight, D. M.
Copyright Year	2016
Abstract	Microbial life flourishes in the ponds of the McMurdo Sound Region, which includes the McMurdo Dry Valleys (MDV) and the exposed coastal areas of Ross Island, Antarctica. Diatoms live within resident microbial mats, and because of the simplified trophic structure and limited dispersal vectors, the McMurdo Sound Region is an ideal locality to investigate diatom community assembly processes. Wind is hypothesized to transport microbiota between habitats, and following the species-sorting perspective, local conditions should act as an environmental filter. However, the role of spatial scale versus habitat characteristics on diatom community structure has not been investigated. To gain insight into these processes, we sampled microbial mats from 25 ponds and used variation partitioning to assess the spatial scales at which diatoms were influenced by chemistry and physical variables. We found substantial spatial structure in diatom communities, and spatial scale explained more variability than environmental variables. No diatoms were exclusive to Ross Island, but some species were only found in the MDVs. Furthermore, diatom communities were more likely to resemble those from other nearby ponds rather than distant ones, regardless of environmental conditions. Of the environmental variables, bromide and chloride (both indicators of marine influence) were among the most important. These results suggest that geography, dispersal, and historical environmental conditions play a major role in structuring diatom communities at large spatial scales, and chemistry may be more important within regions. These results help explain the biogeography of diatoms here and elsewhere and expand our knowledge of mechanisms influencing microbial metacommunity structure.
Starting Page	2441
Ending Page	2456
Page Count	16
File Format	PDF
ISSN	07224060
Journal	Polar Biology
Volume Number	39
Issue Number	12
e-ISSN	14322056
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2016-02-08
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Metacommunity Beta-diversity Cape Royds Species sorting Dry Valley Distance effect Ecology Oceanography Microbiology Plant Sciences Zoology
Content Type	Text
Resource Type	Article
Subject	Agricultural and Biological Sciences

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