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A study of the phytoplankton of Swansea Bay. / Jameel Abdulla Mohammed Abbas

Swansea University Author: Jameel Abdulla Mohammed Abbas

Abstract

The intention at the beginning of this study was to investigate the primary productivity of phytoplankton in Swansea Bay. This productivity was measured fortnightly using the 14C-fixation technique. Biomass standing stock was measured as chlorophyll a m-3 and as cell concentration. Concurrently, sev...

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Published: 1986
Institution: Swansea University
Degree level: Doctoral
Degree name: Ph.D
URI: https://cronfa.swan.ac.uk/Record/cronfa42317
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first_indexed 2018-08-02T18:54:25Z
last_indexed 2018-08-03T10:09:50Z
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spelling 2018-08-02T16:24:28.8073937 v2 42317 2018-08-02 A study of the phytoplankton of Swansea Bay. a8da19a42cc34360ce7c1d6f5b52659b NULL Jameel Abdulla Mohammed Abbas Jameel Abdulla Mohammed Abbas true true 2018-08-02 The intention at the beginning of this study was to investigate the primary productivity of phytoplankton in Swansea Bay. This productivity was measured fortnightly using the 14C-fixation technique. Biomass standing stock was measured as chlorophyll a m-3 and as cell concentration. Concurrently, several environmental factors were measured to relate any possible effect on phytoplankton growth and species succession. The factors studied were seawater temperature, salinity, nitrate, nitrite, ammonia, phosphate, silicate and some meteorological data supplied by a local station. A weak positive correlation was found between net phytoplankton cell number and phytoplankton chlorophyll. Based on this finding, the relative importance of phytoplankton size classes as primary producers was investigated. As a result of this investigation, it has been found that most of the primary productivity (80%) was carried out by phytoplankton less than 20 mum. Special attention was given to the role of nitrate in the 14C-fixation by different phytoplankton size classes and by phytoplankton species grown in synthetic medium. The effect of nitrate on the 14C-fixation by the size classes was investigated using nutrient enrichment technique. From these experiments it has been found that nitrate enrichment stimulates the increase of 14C-fixation by the different size fractions at different rates. When nitrate was given to nitrogen-starved Thalassiosira sp. and Asterionella japonica, it was found that nitrate was taken up at the expense of 14C-fixation. It was also found that algal cells cultured in medium with high nitrate concentration increased their chlorophyll a content. It was concluded from this study that nano and picoplankton play an important role in the productivity of Swansea Bay, and that nitrate plays a significant role as a limiting nutrient not only to the primary productivity of the phytoplankton population as a whole but also to the different phytoplankton size classes. E-Thesis Microbiology.;Biological oceanography. 31 12 1986 1986-12-31 COLLEGE NANME Biosciences COLLEGE CODE Swansea University Doctoral Ph.D 2018-08-02T16:24:28.8073937 2018-08-02T16:24:28.8073937 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Biosciences Jameel Abdulla Mohammed Abbas NULL 1 0042317-02082018162444.pdf 10798025.pdf 2018-08-02T16:24:44.9530000 Output 4860265 application/pdf E-Thesis true 2018-08-02T16:24:44.9530000 false
title A study of the phytoplankton of Swansea Bay.
spellingShingle A study of the phytoplankton of Swansea Bay.
Jameel Abdulla Mohammed Abbas
title_short A study of the phytoplankton of Swansea Bay.
title_full A study of the phytoplankton of Swansea Bay.
title_fullStr A study of the phytoplankton of Swansea Bay.
title_full_unstemmed A study of the phytoplankton of Swansea Bay.
title_sort A study of the phytoplankton of Swansea Bay.
author_id_str_mv a8da19a42cc34360ce7c1d6f5b52659b
author_id_fullname_str_mv a8da19a42cc34360ce7c1d6f5b52659b_***_Jameel Abdulla Mohammed Abbas
author Jameel Abdulla Mohammed Abbas
author2 Jameel Abdulla Mohammed Abbas
format E-Thesis
publishDate 1986
institution Swansea University
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Biosciences, Geography and Physics - Biosciences{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Biosciences, Geography and Physics - Biosciences
document_store_str 1
active_str 0
description The intention at the beginning of this study was to investigate the primary productivity of phytoplankton in Swansea Bay. This productivity was measured fortnightly using the 14C-fixation technique. Biomass standing stock was measured as chlorophyll a m-3 and as cell concentration. Concurrently, several environmental factors were measured to relate any possible effect on phytoplankton growth and species succession. The factors studied were seawater temperature, salinity, nitrate, nitrite, ammonia, phosphate, silicate and some meteorological data supplied by a local station. A weak positive correlation was found between net phytoplankton cell number and phytoplankton chlorophyll. Based on this finding, the relative importance of phytoplankton size classes as primary producers was investigated. As a result of this investigation, it has been found that most of the primary productivity (80%) was carried out by phytoplankton less than 20 mum. Special attention was given to the role of nitrate in the 14C-fixation by different phytoplankton size classes and by phytoplankton species grown in synthetic medium. The effect of nitrate on the 14C-fixation by the size classes was investigated using nutrient enrichment technique. From these experiments it has been found that nitrate enrichment stimulates the increase of 14C-fixation by the different size fractions at different rates. When nitrate was given to nitrogen-starved Thalassiosira sp. and Asterionella japonica, it was found that nitrate was taken up at the expense of 14C-fixation. It was also found that algal cells cultured in medium with high nitrate concentration increased their chlorophyll a content. It was concluded from this study that nano and picoplankton play an important role in the productivity of Swansea Bay, and that nitrate plays a significant role as a limiting nutrient not only to the primary productivity of the phytoplankton population as a whole but also to the different phytoplankton size classes.
published_date 1986-12-31T03:52:43Z
_version_ 1763752609332592640
score 11.013776

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