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Physiological basis for environmenta...

Finkel, Zoe Vanessa.

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Physiological basis for environmentally driven changes in phytoplankton community structure.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Physiological basis for environmentally driven changes in phytoplankton community structure./
作者:	Finkel, Zoe Vanessa.
面頁冊數:	151 p.
附註:	Source: Dissertation Abstracts International, Volume: 66-05, Section: B, page: 2452.
Contained By:	Dissertation Abstracts International66-05B.
標題:	Biology, Oceanography. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3176171
ISBN:	9780542156090

Physiological basis for environmentally driven changes in phytoplankton community structure.
Finkel, Zoe Vanessa.

Physiological basis for environmentally driven changes in phytoplankton community structure. - 151 p.

Source: Dissertation Abstracts International, Volume: 66-05, Section: B, page: 2452.

Thesis (Ph.D.)--Rutgers The State University of New Jersey - New Brunswick, 2005.

The ocean is one of the main reservoirs of carbon, and its ability to act as a long-term sink is affected by phytoplankton through the flux of photosynthetically produced carbon from the surface into the deep ocean, termed the biological pump. Environmentally-driven changes in phytoplankton taxonomic composition, size structure, and elemental composition can alter the biological pump causing climatic feedbacks. I test the hypothesis that physiological responses to resource availability can alter the elemental composition and size scaling of metabolic rates of phytoplankton taxa. I examine the link between taxonomy and elemental composition in phytoplankton over a range of light levels. I then develop a physiological model to examine the consequences of light and nutrient availability for the size scaling of metabolic rates. The physiological model is used as the foundation of an ecological model used to predict the effect of resource availability on the size structure of phytoplankton communities. I develop a record of the frustule size of diatoms that indicates there has been a &sim;3-fold decrease in the average frustule size of the dominant fossilized marine planktonic diatoms over the Cenozoic. This change in size is highly correlated with paleoenvironmental indicators of climatic change associated with changes in nutrient availability in the surface ocean, in agreement with the predictions provided by the physiological and ecological size-resolved models. Unique physiological responses of different phytoplankton taxa to resource availability results in significant changes in elemental composition, metabolic rate, and community structure, indicating that climatic change and evolutionary shifts in the taxonomic composition of phytoplankton communities over ecological and geological time will dramatically alter the magnitude and efficiency of the biological pump and the biogeochemical cycling of elements in the ocean.

ISBN: 9780542156090Subjects--Topical Terms:

783691
Biology, Oceanography.

Physiological basis for environmentally driven changes in phytoplankton community structure.
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