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Desiccation as the principal archite...

Rothrock, Michael J., Jr.

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Desiccation as the principal architect of microbial communities in intertidal mats.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Desiccation as the principal architect of microbial communities in intertidal mats./
作者:	Rothrock, Michael J., Jr.
面頁冊數:	303 p.
附註:	Source: Dissertation Abstracts International, Volume: 66-06, Section: B, page: 2946.
Contained By:	Dissertation Abstracts International66-06B.
標題:	Biology, Microbiology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3178270
ISBN:	9780542175879

Desiccation as the principal architect of microbial communities in intertidal mats.
Rothrock, Michael J., Jr.

Desiccation as the principal architect of microbial communities in intertidal mats. - 303 p.

Source: Dissertation Abstracts International, Volume: 66-06, Section: B, page: 2946.

Thesis (Ph.D.)--Arizona State University, 2005.

Cyanobacterially dominated photosynthetic microbial mats are dense, vertically laminated assemblages of diverse microorganisms that represent self-sustained ecosystems with well-defined physiochemical gradients and highly efficient biogeochemical cycling processes. Once widespread, these mats are presently confined to extreme environments (i.e. hypersaline lakes, hot springs). One of the most extreme environments is one where water, the basic molecule for life, is removed via desiccation. I attempted to ascertain the role of desiccation in structuring photosynthetic mat communities by studying the microbial community responses to natural and manipulated desiccation regimes in intertidal mats.

ISBN: 9780542175879Subjects--Topical Terms:

1017734
Biology, Microbiology.

Desiccation as the principal architect of microbial communities in intertidal mats.
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500 $a Adviser: Ferran Garcia-Pichel.
502 $a Thesis (Ph.D.)--Arizona State University, 2005.
520 $a Cyanobacterially dominated photosynthetic microbial mats are dense, vertically laminated assemblages of diverse microorganisms that represent self-sustained ecosystems with well-defined physiochemical gradients and highly efficient biogeochemical cycling processes. Once widespread, these mats are presently confined to extreme environments (i.e. hypersaline lakes, hot springs). One of the most extreme environments is one where water, the basic molecule for life, is removed via desiccation. I attempted to ascertain the role of desiccation in structuring photosynthetic mat communities by studying the microbial community responses to natural and manipulated desiccation regimes in intertidal mats.
520 $a I conducted molecular biology based analyses of intertidal mats from three tidal heights (high, mid, and low tide) during exposures to their native desiccation regime, after exposure to altered desiccation regimes (via mat transplantation along the tidal gradient), and after exposure to artificial desiccation regimes (via greenhouse maintained mats). Genetic fingerprinting of the native communities revealed clear shifts in cyanobacterial and bacterial communities according to desiccation regime, with diversity and richness estimates negatively correlated to desiccation frequency. Fingerprint analyses of transplanted and greenhouse maintained mats demonstrated obvious microbial community responses towards replicating the native community for lower desiccation frequency regimes, with Cyanobacteria displaying more rapid and complete community responses. Long term exposure to higher desiccation frequencies yielded slower community responses, not sufficient to replicate the cyanobacterial nor the bacterial communities native to the high tide setting. In culture-based analyses, the "photosynthetic recovery" of four cyanobacterial isolates was strongly correlated to increasingly extreme desiccation settings for representative mid and low tide strains, while a high tide strain did not exhibit any of these ill effects. Of the four isolates, the high tide strain retained the most intracellular water after desiccation, and likely possessed a competitive physiological advantage over the more desiccation sensitive strains when exposed to an approximated high tide desiccation regime.
520 $a My results indicate the central architectural role desiccation plays in intertidal mat communities. Limited "physiologically active times" under higher desiccation frequencies selects for those desiccation tolerant microbes that can best utilize the short amount of time during which water is available, while less efficient microbes are relegated to lower desiccation frequency settings.
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