A baseline assessment of coastal pH variability in a temperate South African embayment: implications for biological ocean acidification research
Compared with the open ocean, knowledge of pH variability in coastal waters is rudimentary, especially in Africa. This is concerning as quantifying local pH conditions is critical when assessing the response of coastal species to future ocean acidification scenarios. The objective of this study was...
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ftunivfreestate:oai:figshare.com:article/21749556 2023-05-15T17:50:12+02:00 A baseline assessment of coastal pH variability in a temperate South African embayment: implications for biological ocean acidification research C Edworthy (14277651) WM Potts (5038595) S Dupont (13736362) MI Duncan (14277654) TG Bornman (8434272) NC James (5800286) 2022-12-19T08:40:11Z https://doi.org/10.6084/m9.figshare.21749556.v1 unknown https://figshare.com/articles/journal_contribution/A_baseline_assessment_of_coastal_pH_variability_in_a_temperate_South_African_embayment_implications_for_biological_ocean_acidification_research/21749556 doi:10.6084/m9.figshare.21749556.v1 CC BY 4.0 CC-BY Ecology Inorganic Chemistry Environmental Sciences not elsewhere classified Biological Sciences not elsewhere classified Chemical Sciences not elsewhere classified Algoa Bay carbonate chemistry coastal acidification monitoring pH variability seawater Text Journal contribution 2022 ftunivfreestate https://doi.org/10.6084/m9.figshare.21749556.v1 2022-12-23T00:32:55Z Compared with the open ocean, knowledge of pH variability in coastal waters is rudimentary, especially in Africa. This is concerning as quantifying local pH conditions is critical when assessing the response of coastal species to future ocean acidification scenarios. The objective of this study was to capture some of the variability in pH at scales and sites relevant to coastal marine organisms in a South African temperate embayment (Algoa Bay, Indian Ocean). We used a sampling approach that captured spatial (at a resolution of ∼10 km), monthly and diel (24-hour) variability in pH and associated physical and biological parameters at offshore and shallow inshore sites in Algoa Bay. We found that pH and associated parameters (temperature, calculated p CO 2 , chlorophyll a ) varied over space and time in Algoa Bay. The range in pH was 0.30 units at offshore sites and 0.46 at inshore sites, and the average pH was 8.10 (SD 0.06) and 8.10 (SD 0.13) at these sites, respectively, which is typical for coastal environments. Our results showed that both biological factors (at the offshore sites) and salinity (at the inshore sites) may influence temporal and spatial variability in pH. We also identified a shallow inshore site with high levels of macroalgal growth that had consistently higher average daytime pH levels (8.33 [SD 0.07]), which may serve as an ocean acidification refuge for coastal marine species. This is the first comprehensive pH-monitoring study to be implemented in a nearshore coastal area in Africa and provides recommendations for monitoring in other understudied regions. Other Non-Article Part of Journal/Newspaper Ocean acidification KovsieScholar Repository (University of the Free State - UFS UV) Indian |
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Open Polar |
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KovsieScholar Repository (University of the Free State - UFS UV) |
op_collection_id |
ftunivfreestate |
language |
unknown |
topic |
Ecology Inorganic Chemistry Environmental Sciences not elsewhere classified Biological Sciences not elsewhere classified Chemical Sciences not elsewhere classified Algoa Bay carbonate chemistry coastal acidification monitoring pH variability seawater |
spellingShingle |
Ecology Inorganic Chemistry Environmental Sciences not elsewhere classified Biological Sciences not elsewhere classified Chemical Sciences not elsewhere classified Algoa Bay carbonate chemistry coastal acidification monitoring pH variability seawater C Edworthy (14277651) WM Potts (5038595) S Dupont (13736362) MI Duncan (14277654) TG Bornman (8434272) NC James (5800286) A baseline assessment of coastal pH variability in a temperate South African embayment: implications for biological ocean acidification research |
topic_facet |
Ecology Inorganic Chemistry Environmental Sciences not elsewhere classified Biological Sciences not elsewhere classified Chemical Sciences not elsewhere classified Algoa Bay carbonate chemistry coastal acidification monitoring pH variability seawater |
description |
Compared with the open ocean, knowledge of pH variability in coastal waters is rudimentary, especially in Africa. This is concerning as quantifying local pH conditions is critical when assessing the response of coastal species to future ocean acidification scenarios. The objective of this study was to capture some of the variability in pH at scales and sites relevant to coastal marine organisms in a South African temperate embayment (Algoa Bay, Indian Ocean). We used a sampling approach that captured spatial (at a resolution of ∼10 km), monthly and diel (24-hour) variability in pH and associated physical and biological parameters at offshore and shallow inshore sites in Algoa Bay. We found that pH and associated parameters (temperature, calculated p CO 2 , chlorophyll a ) varied over space and time in Algoa Bay. The range in pH was 0.30 units at offshore sites and 0.46 at inshore sites, and the average pH was 8.10 (SD 0.06) and 8.10 (SD 0.13) at these sites, respectively, which is typical for coastal environments. Our results showed that both biological factors (at the offshore sites) and salinity (at the inshore sites) may influence temporal and spatial variability in pH. We also identified a shallow inshore site with high levels of macroalgal growth that had consistently higher average daytime pH levels (8.33 [SD 0.07]), which may serve as an ocean acidification refuge for coastal marine species. This is the first comprehensive pH-monitoring study to be implemented in a nearshore coastal area in Africa and provides recommendations for monitoring in other understudied regions. |
format |
Other Non-Article Part of Journal/Newspaper |
author |
C Edworthy (14277651) WM Potts (5038595) S Dupont (13736362) MI Duncan (14277654) TG Bornman (8434272) NC James (5800286) |
author_facet |
C Edworthy (14277651) WM Potts (5038595) S Dupont (13736362) MI Duncan (14277654) TG Bornman (8434272) NC James (5800286) |
author_sort |
C Edworthy (14277651) |
title |
A baseline assessment of coastal pH variability in a temperate South African embayment: implications for biological ocean acidification research |
title_short |
A baseline assessment of coastal pH variability in a temperate South African embayment: implications for biological ocean acidification research |
title_full |
A baseline assessment of coastal pH variability in a temperate South African embayment: implications for biological ocean acidification research |
title_fullStr |
A baseline assessment of coastal pH variability in a temperate South African embayment: implications for biological ocean acidification research |
title_full_unstemmed |
A baseline assessment of coastal pH variability in a temperate South African embayment: implications for biological ocean acidification research |
title_sort |
baseline assessment of coastal ph variability in a temperate south african embayment: implications for biological ocean acidification research |
publishDate |
2022 |
url |
https://doi.org/10.6084/m9.figshare.21749556.v1 |
geographic |
Indian |
geographic_facet |
Indian |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_relation |
https://figshare.com/articles/journal_contribution/A_baseline_assessment_of_coastal_pH_variability_in_a_temperate_South_African_embayment_implications_for_biological_ocean_acidification_research/21749556 doi:10.6084/m9.figshare.21749556.v1 |
op_rights |
CC BY 4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.6084/m9.figshare.21749556.v1 |
_version_ |
1766156852661321728 |