Phytoplankton distributions and species composition across the Texas-Louisiana continental shelf during two flow regimes of the Mississippi River /
1993, which was a record flow year. Water samples for
| Main Author: | |
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| Format: | Thesis eBook |
| Language: | English |
| Published: |
[Place of publication not identified] :
[publisher not identified] ;
1995.
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| Subjects: | |
| Online Access: | Link to OAKTrust copy |
| Summary: | 1993, which was a record flow year. Water samples for and May 1993, as part of a phytoplankton diversity study and others were predominant in both years. On the middle as dinoflagenates, microflagellates, and coccolithophorids became more dominant. The outer shelf upper water column was benthos supported the phytoplankton community on the middle concentrations in May 1993 were approximately double those in costatum (Grevifle) Grunow, which is found in a range of cross-shelf transacts from 90.5' to 94.0'W longitude. CTD, preserved in 1% glutaraldehyde, and analyzed using the decreased more moving from the middle to the outer shelf. differences were found in May 1993 due to the record river discharge. In 1992 and 1993, the inner shelf was diatom distribution data were assessed in relation to the distributions from 1992 , which was an average flow year for dominant than on the middle shelf. The diatom population dominated, and was characterized by the highest nutrient and dramatic shift in dominant diatom species to Skeletonema Effects of a warm core Loop Current eddy were evident on the found to be oligotrophic, so smaller or more motile cers such funded by the Office of Naval Research. Phytoplankton hydrography and physical processes on the shelf, which were hydrography and physical processes were found on the inner, Lower concentrations of phytoplankton were present on the lowest safety values. River discharge and associated maximum from Niskin bottles attached to a Sea-Bird SBE911plus May 1992. The increased river discharge in 1993 caused a may provide a means of supporting the phytoplankton microflagellates, and coccolithophorids were even more middle shelf than the inner shelf during both years. The middle, and outer shelf during both flow regimes. Some nutrient-poor as well during both years, and dinoflageuates, nutrients were focused by the localized downcoast flow of the shelf to the western part in May 1992. The opposite outer shelf area. Upwelling processes shallower than 100 m over the Texas-Louisiana continental shelf during May 1992 overall phytoplankton abundance in May 1993. Phytoplankton abundance and species composition were examined phytoplankton determinations were examined at 22 locations on population at the chlorophyll maximum on the outer shelf. possibility of benthic regeneration of nutrients and predominant on the inner shelf area during the month of May. regime was present in May 1993. Inner shelf nutrient resuspension into the upper water column. This flux from the salinities, temperatures, and depths. Chain-forming diatom Samples were collected at the surface and the chlorophyll shelf, the presence of tychopelagic diatoms reflected the shelf, where a near-bottom chlorophyll maximum was found. studied as part of the Texas-Louisiana Shelf Circulation and The location of the increased volume of river water across the Mississippi River, were compared with observations from the shelf in May 1993 was identified based on the increase in Transport Processes Study (LATEX A). Phytoplankton group Unique phytoplankton distributions and regionspecific upper 30-70 m of the water column on the middle shelf were Uterm6hl method and the inverted-microscope technique. Water column stability decreased moving from the eastern part |
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| Item Description: | "Major subject: Oceanography". Vita. |
| Physical Description: | xiii, 261 leaves : illustrations, maps ; 28 cm. Also available online. Issued also on microfiche from Lange Micrographics. |
| Bibliography: | Includes bibliographical references. |