Impacts of emerging pollutants on early development of marine invertebrates : case studies on microplastics and interaction between fluoxetine and ocean acidification
Exposure to emerging pollutants has put marine organisms living in the coastal environments at risk. However, the ambient concentration of these emerging pollutants is poorly understood in Hong Kong. This dissertation is the first to measure the ambient concentrations of fluoxetine in Port Shelter,...
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ftunivsthongkong:oai:repository.hkust.edu.hk:1783.1-121543 2023-05-15T17:50:21+02:00 Impacts of emerging pollutants on early development of marine invertebrates : case studies on microplastics and interaction between fluoxetine and ocean acidification Lo, Hau Kwan 2020 https://repository.hkust.edu.hk/ir/Record/1783.1-121543 https://doi.org/10.14711/thesis-991012899465003412 https://repository.hkust.edu.hk/ir/bitstream/1783.1-121543/1/th_redirect.html English eng https://repository.hkust.edu.hk/ir/Record/1783.1-121543 https://doi.org/10.14711/thesis-991012899465003412 https://repository.hkust.edu.hk/ir/bitstream/1783.1-121543/1/th_redirect.html Marine invertebrates Larvae Effect of water pollution on Marine pollution China Hong Kong Fluoxetine Ocean acidification Thesis 2020 ftunivsthongkong https://doi.org/10.14711/thesis-991012899465003412 2022-11-11T01:08:11Z Exposure to emerging pollutants has put marine organisms living in the coastal environments at risk. However, the ambient concentration of these emerging pollutants is poorly understood in Hong Kong. This dissertation is the first to measure the ambient concentrations of fluoxetine in Port Shelter, Hong Kong. With the measured concentration of fluoxetine in eastern Hong Kong waters, I studied its impacts on larval marine invertebrates under environmentally-relevant concentrations. This dissertation research is also the first of its kind to modify the protocol of comet assay to reliably detect DNA strand break in larvae exposed to a stressor at environmentally-relevant concentrations across various phyla. Very often, the adverse impacts of ocean acidification (OA) or exposure to pharmaceuticals were studied alone. However, little is known about the interactive effect between fluoxetine and OA, even when the bioavailability of many pharmaceuticals is pH-dependent and/or the two stressors act upon similar physiological pathways. Even if the interactive impacts on a single species were thoroughly understood, it is still unclear how such observed impacts could be translated to other species. Here, I exposed larval sea urchins Heliocidaris crassispina to the environmentally relevant concentration of fluoxetine (10 and 100 ng L- 1 ) under present-day (pH 8.0) and future ocean conditions (pH 7.7). Then, I took a comparative approach and exposed larval Styela plicata to a similar set of conditions. The impacts of fluoxetine exposure on both species were modulated by OA. However, the impacts on the early development of S. plicata were much subtler than that observed in H. crassispina. This study's results highlight that future studies on ecological risks should consider interactive effects and differences in life-history traits before concluding how the stressor(s) could affect the population and community structures. Thesis Ocean acidification The Hong Kong University of Science and Technology: HKUST Institutional Repository |
institution |
Open Polar |
collection |
The Hong Kong University of Science and Technology: HKUST Institutional Repository |
op_collection_id |
ftunivsthongkong |
language |
English |
topic |
Marine invertebrates Larvae Effect of water pollution on Marine pollution China Hong Kong Fluoxetine Ocean acidification |
spellingShingle |
Marine invertebrates Larvae Effect of water pollution on Marine pollution China Hong Kong Fluoxetine Ocean acidification Lo, Hau Kwan Impacts of emerging pollutants on early development of marine invertebrates : case studies on microplastics and interaction between fluoxetine and ocean acidification |
topic_facet |
Marine invertebrates Larvae Effect of water pollution on Marine pollution China Hong Kong Fluoxetine Ocean acidification |
description |
Exposure to emerging pollutants has put marine organisms living in the coastal environments at risk. However, the ambient concentration of these emerging pollutants is poorly understood in Hong Kong. This dissertation is the first to measure the ambient concentrations of fluoxetine in Port Shelter, Hong Kong. With the measured concentration of fluoxetine in eastern Hong Kong waters, I studied its impacts on larval marine invertebrates under environmentally-relevant concentrations. This dissertation research is also the first of its kind to modify the protocol of comet assay to reliably detect DNA strand break in larvae exposed to a stressor at environmentally-relevant concentrations across various phyla. Very often, the adverse impacts of ocean acidification (OA) or exposure to pharmaceuticals were studied alone. However, little is known about the interactive effect between fluoxetine and OA, even when the bioavailability of many pharmaceuticals is pH-dependent and/or the two stressors act upon similar physiological pathways. Even if the interactive impacts on a single species were thoroughly understood, it is still unclear how such observed impacts could be translated to other species. Here, I exposed larval sea urchins Heliocidaris crassispina to the environmentally relevant concentration of fluoxetine (10 and 100 ng L- 1 ) under present-day (pH 8.0) and future ocean conditions (pH 7.7). Then, I took a comparative approach and exposed larval Styela plicata to a similar set of conditions. The impacts of fluoxetine exposure on both species were modulated by OA. However, the impacts on the early development of S. plicata were much subtler than that observed in H. crassispina. This study's results highlight that future studies on ecological risks should consider interactive effects and differences in life-history traits before concluding how the stressor(s) could affect the population and community structures. |
format |
Thesis |
author |
Lo, Hau Kwan |
author_facet |
Lo, Hau Kwan |
author_sort |
Lo, Hau Kwan |
title |
Impacts of emerging pollutants on early development of marine invertebrates : case studies on microplastics and interaction between fluoxetine and ocean acidification |
title_short |
Impacts of emerging pollutants on early development of marine invertebrates : case studies on microplastics and interaction between fluoxetine and ocean acidification |
title_full |
Impacts of emerging pollutants on early development of marine invertebrates : case studies on microplastics and interaction between fluoxetine and ocean acidification |
title_fullStr |
Impacts of emerging pollutants on early development of marine invertebrates : case studies on microplastics and interaction between fluoxetine and ocean acidification |
title_full_unstemmed |
Impacts of emerging pollutants on early development of marine invertebrates : case studies on microplastics and interaction between fluoxetine and ocean acidification |
title_sort |
impacts of emerging pollutants on early development of marine invertebrates : case studies on microplastics and interaction between fluoxetine and ocean acidification |
publishDate |
2020 |
url |
https://repository.hkust.edu.hk/ir/Record/1783.1-121543 https://doi.org/10.14711/thesis-991012899465003412 https://repository.hkust.edu.hk/ir/bitstream/1783.1-121543/1/th_redirect.html |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_relation |
https://repository.hkust.edu.hk/ir/Record/1783.1-121543 https://doi.org/10.14711/thesis-991012899465003412 https://repository.hkust.edu.hk/ir/bitstream/1783.1-121543/1/th_redirect.html |
op_doi |
https://doi.org/10.14711/thesis-991012899465003412 |
_version_ |
1766157061993791488 |