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Changes in Community structure and dominance triggered by seasonal and abiotic differences in saline lagoons / AMELIA JONES

Swansea University Author: AMELIA JONES

Abstract

The geographical distribution of species across habitats depends on the environmental conditions and biotic interactions. In coastal saline lagoons environmental conditions are highly variable due to influxes of both salt and freshwater. Despite this, many species periodically enter saline lagoons,...

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Published: Swansea University, Wales, UK 2025
Institution: Swansea University
Degree level: Master of Research
Degree name: MRes
Supervisor: Lurgi, M., and Esteban, N.
URI: https://cronfa.swan.ac.uk/Record/cronfa69056
first_indexed 2025-03-06T16:01:48Z
last_indexed 2025-03-07T05:49:41Z
id cronfa69056
recordtype RisThesis
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spelling 2025-03-06T16:16:32.9202817 v2 69056 2025-03-06 Changes in Community structure and dominance triggered by seasonal and abiotic differences in saline lagoons 695aa1469902ae3d6ce08e196da5278c AMELIA JONES AMELIA JONES true false 2025-03-06 The geographical distribution of species across habitats depends on the environmental conditions and biotic interactions. In coastal saline lagoons environmental conditions are highly variable due to influxes of both salt and freshwater. Despite this, many species periodically enter saline lagoons, dependant on the conditions, marine, estuarine and freshwater species have all been recorded in these habitats. Lagoonal communities are characterised by euryhaline lagoonal specialist that are adapted to tolerate the environmental variation. However little is known about how fish and invertebrate communities react to environmental change, specifically over short term changes during different periods of salt water flooding. Here we show how the community as a whole and how fish and invertebrate species individually respond to these changes.Seasonality was the only temporal influence on community structure, however species abundance was impacted by both month and flooding phase. Temperature, dissolved oxygen, pH and turbidity all influenced community structure, however invertebrate and fish communities were impacted differently. Fish abundance increased by an average of 202% when dissolved oxygen concentration increased from 3 to 8 mg l-1, but fish diversity decreased with increasing oxygen. Temperature and fish diversity were positively correlated increasing by 49% from 10 to 15°C. Invertebrate abundance was positively correlated with salinity, increasing by 55% between 2 and 4 PSU, but negatively correlated with dissolved oxygen. Increase invertebrate diversity was only significantly linked to a decrease in chlorophyll fluorescence. There was a negative correlation between fish and invertebrate abundance, but this was not significant.This study highlights the varied impact of environmental factors on community structures, emphasising the need for tailored management strategies in naturally stressed saline lagoons. These ecosystems are particularly vulnerable to climate change and eutrophication due to their small volume and isolated nature. By understanding how communities respond to environmental change, we can manage these habitats more effectively and restore the biodiversity of specialised and protected species. E-Thesis Swansea University, Wales, UK Community ecology, environmental change, saline lagoon, fish, invertebrates 11 2 2025 2025-02-11 A selection of content is redacted or is partially redacted from this thesis to protect sensitive and personal information COLLEGE NANME COLLEGE CODE Swansea University Lurgi, M., and Esteban, N. Master of Research MRes 2025-03-06T16:16:32.9202817 2025-03-06T15:58:38.5597174 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Biosciences AMELIA JONES 1 69056__33754__55e8f4a15d1a491c8abe2d985500098a.pdf 2024_Jones_A.final.69056.pdf 2025-03-06T16:09:29.1348152 Output 1663382 application/pdf E-Thesis – open access true Copyright: The Author, Amelia Jones, 2024 true eng
title Changes in Community structure and dominance triggered by seasonal and abiotic differences in saline lagoons
spellingShingle Changes in Community structure and dominance triggered by seasonal and abiotic differences in saline lagoons
AMELIA JONES
title_short Changes in Community structure and dominance triggered by seasonal and abiotic differences in saline lagoons
title_full Changes in Community structure and dominance triggered by seasonal and abiotic differences in saline lagoons
title_fullStr Changes in Community structure and dominance triggered by seasonal and abiotic differences in saline lagoons
title_full_unstemmed Changes in Community structure and dominance triggered by seasonal and abiotic differences in saline lagoons
title_sort Changes in Community structure and dominance triggered by seasonal and abiotic differences in saline lagoons
author_id_str_mv 695aa1469902ae3d6ce08e196da5278c
author_id_fullname_str_mv 695aa1469902ae3d6ce08e196da5278c_***_AMELIA JONES
author AMELIA JONES
author2 AMELIA JONES
format E-Thesis
publishDate 2025
institution Swansea University
college_str Faculty of Science and Engineering
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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 geographical distribution of species across habitats depends on the environmental conditions and biotic interactions. In coastal saline lagoons environmental conditions are highly variable due to influxes of both salt and freshwater. Despite this, many species periodically enter saline lagoons, dependant on the conditions, marine, estuarine and freshwater species have all been recorded in these habitats. Lagoonal communities are characterised by euryhaline lagoonal specialist that are adapted to tolerate the environmental variation. However little is known about how fish and invertebrate communities react to environmental change, specifically over short term changes during different periods of salt water flooding. Here we show how the community as a whole and how fish and invertebrate species individually respond to these changes.Seasonality was the only temporal influence on community structure, however species abundance was impacted by both month and flooding phase. Temperature, dissolved oxygen, pH and turbidity all influenced community structure, however invertebrate and fish communities were impacted differently. Fish abundance increased by an average of 202% when dissolved oxygen concentration increased from 3 to 8 mg l-1, but fish diversity decreased with increasing oxygen. Temperature and fish diversity were positively correlated increasing by 49% from 10 to 15°C. Invertebrate abundance was positively correlated with salinity, increasing by 55% between 2 and 4 PSU, but negatively correlated with dissolved oxygen. Increase invertebrate diversity was only significantly linked to a decrease in chlorophyll fluorescence. There was a negative correlation between fish and invertebrate abundance, but this was not significant.This study highlights the varied impact of environmental factors on community structures, emphasising the need for tailored management strategies in naturally stressed saline lagoons. These ecosystems are particularly vulnerable to climate change and eutrophication due to their small volume and isolated nature. By understanding how communities respond to environmental change, we can manage these habitats more effectively and restore the biodiversity of specialised and protected species.
published_date 2025-02-11T05:24:07Z
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score 11.096852

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