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Advancing understanding of kelp aquaculture in Wales: tests across multiple life stages and environmental contexts / KASPER BRANDT

Swansea University Author: KASPER BRANDT

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DOI (Published version): 10.23889/SUthesis.63625

Abstract

Seaweed aquaculture can provide an important food source for a growing world population, without the negative impacts of land-based cultivation, like excessive use of fresh water or pesticides. While seaweed aquaculture is established in Asia, there are still many challenges in the cultivation of se...

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Published: Swansea, Wales, UK 2023
Institution: Swansea University
Degree level: Doctoral
Degree name: Ph.D
Supervisor: Griffin, John N.
URI: https://cronfa.swan.ac.uk/Record/cronfa63625
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first_indexed 2023-06-13T10:02:19Z
last_indexed 2023-06-13T10:02:19Z
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spelling v2 63625 2023-06-13 Advancing understanding of kelp aquaculture in Wales: tests across multiple life stages and environmental contexts 3ea91d4bd3bb15a5451bef888a7685b4 KASPER BRANDT KASPER BRANDT true false 2023-06-13 Seaweed aquaculture can provide an important food source for a growing world population, without the negative impacts of land-based cultivation, like excessive use of fresh water or pesticides. While seaweed aquaculture is established in Asia, there are still many challenges in the cultivation of seaweeds in Europe. My research aimed to find solutions to some of the challenges in cultivating three kelp species endemic to Wales: Laminaria digitata, L. hyperborea and Saccharina latissima. I investigated the potential for prediction of optimal sites for seaweed farming through growth modelling, methods for spore acquisition and storage, the effect of nitrate and salinity on kelp growth during microscopic life stages, and changes in kelp morphology throughout the year. Using a large ria in southwest Wales (Milford Haven) as a test case, model results for Saccharina latissima indicated a large section of the nutrient rich, but brackish, part of the ria provides the conditions necessary for good growth and yield. The effects of salinity and nitrate concentration were similar between kelp species but differed between life stages. Salinity affected germination rate, while nitrate concentration influenced gametophyte growth rate. Some of the ecosystem services that kelps provide are tied to their morphology. The kelp L. hyperborea maintains a large blade and stipe throughout the year, while other species change with the seasons. Meaning some kelps can provide morphology-related ecosystem services throughout year-round, while others cannot. Kelp spores can be stored using two-step cryopreservation with DMSO as a cryoprotectant, but the survival rate of the spores is too low to be commercially effective. A sori storage time of 24 to 48 hours is recommended for spore acquisition. Collectively these results show that, while questions remain on some of the details concerning seaweed aquaculture, there is potential for the application of seaweed aquaculture in Wales. E-Thesis Swansea, Wales, UK Kelp, aquaculture, seaweed farm, salinity, site selection, morphology 17 4 2023 2023-04-17 10.23889/SUthesis.63625 COLLEGE NANME COLLEGE CODE Swansea University Griffin, John N. Doctoral Ph.D KESS 2 2023-09-29T10:34:14.4788083 2023-06-13T10:59:43.2679232 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Biosciences KASPER BRANDT 1 63625__27816__63f0aece1a4d4b4aa1ef5b119e827bbf.pdf 2023_Brandt_KMF.final.63625.pdf 2023-06-13T11:06:20.7399580 Output 3719245 application/pdf E-Thesis – open access true Copyright: The Author, Kasper M. F. Brandt, 2023. Distributed under the terms of a Creative Commons Attribution 4.0 License (CC BY 4.0). true eng https://creativecommons.org/licenses/by/4.0/
title Advancing understanding of kelp aquaculture in Wales: tests across multiple life stages and environmental contexts
spellingShingle Advancing understanding of kelp aquaculture in Wales: tests across multiple life stages and environmental contexts
KASPER BRANDT
title_short Advancing understanding of kelp aquaculture in Wales: tests across multiple life stages and environmental contexts
title_full Advancing understanding of kelp aquaculture in Wales: tests across multiple life stages and environmental contexts
title_fullStr Advancing understanding of kelp aquaculture in Wales: tests across multiple life stages and environmental contexts
title_full_unstemmed Advancing understanding of kelp aquaculture in Wales: tests across multiple life stages and environmental contexts
title_sort Advancing understanding of kelp aquaculture in Wales: tests across multiple life stages and environmental contexts
author_id_str_mv 3ea91d4bd3bb15a5451bef888a7685b4
author_id_fullname_str_mv 3ea91d4bd3bb15a5451bef888a7685b4_***_KASPER BRANDT
author KASPER BRANDT
author2 KASPER BRANDT
format E-Thesis
publishDate 2023
institution Swansea University
doi_str_mv 10.23889/SUthesis.63625
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
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description Seaweed aquaculture can provide an important food source for a growing world population, without the negative impacts of land-based cultivation, like excessive use of fresh water or pesticides. While seaweed aquaculture is established in Asia, there are still many challenges in the cultivation of seaweeds in Europe. My research aimed to find solutions to some of the challenges in cultivating three kelp species endemic to Wales: Laminaria digitata, L. hyperborea and Saccharina latissima. I investigated the potential for prediction of optimal sites for seaweed farming through growth modelling, methods for spore acquisition and storage, the effect of nitrate and salinity on kelp growth during microscopic life stages, and changes in kelp morphology throughout the year. Using a large ria in southwest Wales (Milford Haven) as a test case, model results for Saccharina latissima indicated a large section of the nutrient rich, but brackish, part of the ria provides the conditions necessary for good growth and yield. The effects of salinity and nitrate concentration were similar between kelp species but differed between life stages. Salinity affected germination rate, while nitrate concentration influenced gametophyte growth rate. Some of the ecosystem services that kelps provide are tied to their morphology. The kelp L. hyperborea maintains a large blade and stipe throughout the year, while other species change with the seasons. Meaning some kelps can provide morphology-related ecosystem services throughout year-round, while others cannot. Kelp spores can be stored using two-step cryopreservation with DMSO as a cryoprotectant, but the survival rate of the spores is too low to be commercially effective. A sori storage time of 24 to 48 hours is recommended for spore acquisition. Collectively these results show that, while questions remain on some of the details concerning seaweed aquaculture, there is potential for the application of seaweed aquaculture in Wales.
published_date 2023-04-17T10:34:15Z
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score 11.016258

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