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Analysis of pelagic ecosystem structure.

Sutton, Tracey Terrell.

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Analysis of pelagic ecosystem structure.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Analysis of pelagic ecosystem structure./
作者:	Sutton, Tracey Terrell.
面頁冊數:	86 p.
附註:	Major Professor: Thomas L. Hopkins.
Contained By:	Dissertation Abstracts International63-02B.
標題:	Agriculture, Fisheries and Aquaculture. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3041126
ISBN:	0493545468

Analysis of pelagic ecosystem structure.
Sutton, Tracey Terrell.

Analysis of pelagic ecosystem structure. - 86 p.

Major Professor: Thomas L. Hopkins.

Thesis (Ph.D.)--University of South Florida, 2001.

The resolution and scale of an ecosystem study are determined by the number, volume and distribution of samples, with higher resolution gained from more, smaller samples. Multiple-net samplers have been developed to achieve higher resolution in the study of plankton, but samples obtained with nets are discontinuous and suffer from the bias imposed by the sampling strategy employed. It is now possible to acquire continuous <italic>in situ</italic> data on plankton sensors using optical sensors that count and size particles. However, these sensors are subject to high noise-to-signal ratios, do not differentiate between living and non-living particles, and fail to identify faunal composition in all but the lowest diversity ecosystems. A new towed instrument array, the High Resolution Sampler (HRS), has been developed which combines traditional plankton sampling methods with recent advances in electronic sensor technology to increase the resolution of plankton studies. The prototype (HRS I) was employed in the Weddell Sea to study zooplankton distributions in the context of an austral spring ice-edge phytoplankton bloom. Overall, zooplankton abundances were lowest within the ice-edge domain where phytoplankton stocks were highest. Highest zooplankton densities were found seaward of the retreating ice-edge. Patchiness was observed in the form of elevated plankton densities at the ice-edge/deep-ice transition zone. The Optical Plankton Counter (OPC) was unable to provide reliable distribution data, possibly due to high detrital abundance. A second-generation sampler, the HRS II, was designed to overcome limitations of the prototype. The HRS II was employed over the west Florida shelf to estimate zooplankton grazing impact. A tight biophysical coupling was observed, with three main plankton communities associated with three water masses. Grazing pressure mirrored this pattern, with the offshore sub-pycnocline community contributing &sim;65% of grazing pressure despite representing only 19% of the total volume of the sampling transect. This suggests pressure is highly localized, emphasizing the need for high-resolution sampling to better understand plankton dynamics.

ISBN: 0493545468Subjects--Topical Terms:

1020913
Agriculture, Fisheries and Aquaculture.

Analysis of pelagic ecosystem structure.
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