1
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Zhao L, Harvey BP, Higuchi T, Agostini S, Tanaka K, Murakami-Sugihara N, Morgan H, Baker P, Hall-Spencer JM, Shirai K. Ocean acidification stunts molluscan growth at CO 2 seeps. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 873:162293. [PMID: 36813205 DOI: 10.1016/j.scitotenv.2023.162293] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/19/2022] [Revised: 02/07/2023] [Accepted: 02/13/2023] [Indexed: 06/18/2023]
Abstract
Ocean acidification can severely affect bivalve molluscs, especially their shell calcification. Assessing the fate of this vulnerable group in a rapidly acidifying ocean is therefore a pressing challenge. Volcanic CO2 seeps are natural analogues of future ocean conditions that offer unique insights into the scope of marine bivalves to cope with acidification. Here, we used a 2-month reciprocal transplantation of the coastal mussel Septifer bilocularis collected from reference and elevated pCO2 habitats to explore how they calcify and grow at CO2 seeps on the Pacific coast of Japan. We found significant decreases in condition index (an indication of tissue energy reserves) and shell growth of mussels living under elevated pCO2 conditions. These negative responses in their physiological performance under acidified conditions were closely associated with changes in their food sources (shown by changes to the soft tissue δ13C and δ15N ratios) and changes in their calcifying fluid carbonate chemistry (based on shell carbonate isotopic and elemental signatures). The reduced shell growth rate during the transplantation experiment was further supported by shell δ13C records along their incremental growth layers, as well as their smaller shell size despite being of comparable ontogenetic ages (5-7 years old, based on shell δ18O records). Taken together, these findings demonstrate how ocean acidification at CO2 seeps affects mussel growth and reveal that lowered shell growth helps them survive stressful conditions.
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Affiliation(s)
- Liqiang Zhao
- College of Fisheries, Guangdong Ocean University, Zhanjiang 524088, China; Atmosphere and Ocean Research Institute, The University of Tokyo, Chiba 277-8564, Japan.
| | - Ben P Harvey
- Shimoda Marine Research Center, University of Tsukuba, Shimoda 415-0025, Japan.
| | - Tomihiko Higuchi
- Atmosphere and Ocean Research Institute, The University of Tokyo, Chiba 277-8564, Japan
| | - Sylvain Agostini
- Shimoda Marine Research Center, University of Tsukuba, Shimoda 415-0025, Japan
| | - Kentaro Tanaka
- Atmosphere and Ocean Research Institute, The University of Tokyo, Chiba 277-8564, Japan
| | | | - Holly Morgan
- School of Biological and Marine Sciences, University of Plymouth, Plymouth PL4 8AA, UK
| | - Phoebe Baker
- School of Biological and Marine Sciences, University of Plymouth, Plymouth PL4 8AA, UK
| | - Jason M Hall-Spencer
- Shimoda Marine Research Center, University of Tsukuba, Shimoda 415-0025, Japan; School of Biological and Marine Sciences, University of Plymouth, Plymouth PL4 8AA, UK
| | - Kotaro Shirai
- Atmosphere and Ocean Research Institute, The University of Tokyo, Chiba 277-8564, Japan
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2
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Nguyen TVH. Welfare impact of climate change on capture fisheries in Vietnam. PLoS One 2022; 17:e0264997. [PMID: 35468138 PMCID: PMC9038203 DOI: 10.1371/journal.pone.0264997] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2021] [Accepted: 02/21/2022] [Indexed: 11/18/2022] Open
Abstract
Fisheries are forecasted to shrink in the tropics due to climate change. In Vietnam, fisheries are a pro-poor economic sector and essential nutrition source; however, welfares of producers and consumers in the climate change context are not well understood. While most studies focus on the gains or losses of total products and revenues, this paper pays additional attention to the changes in surpluses of market players in the long run. A combination of the production function, demand and supply functions, and partial equilibrium analysis is employed to measure the production and welfare impacts based on time series data from 1976 to 2018 and a Vietnam household living standards survey in 2018. The results show that relative to the present, catch yield is likely to reduce 35%-45% by mid-century and 45%-80% by the end of the century. Consumers may lose their surplus of 7-9 billion USD (PPP, 2018) by 2035 and 10-18 billion USD by 2065 due to supply reduction, while producers may gain additional profit of 3.5-4.5 billion USD by 2035 and 5-9 billion USD by 2065 owing to a price increase. The research findings suggest that Vietnam could impose measures to limit capture effort, as set out in the Law of Fisheries 2017, without harming fisher welfare. The expansion of aquaculture could reduce the gap between supply and demand of wild fish to mitigate consumer welfare loss; however, this impact is still ambiguous.
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Affiliation(s)
- Thi Vinh Ha Nguyen
- University of Economics and Business, Vietnam National University, Hanoi, Vietnam
- * E-mail:
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3
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Agostini S, Harvey BP, Milazzo M, Wada S, Kon K, Floc'h N, Komatsu K, Kuroyama M, Hall-Spencer JM. Simplification, not "tropicalization", of temperate marine ecosystems under ocean warming and acidification. GLOBAL CHANGE BIOLOGY 2021; 27:4771-4784. [PMID: 34268836 DOI: 10.1111/gcb.15749] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/10/2021] [Revised: 05/28/2021] [Accepted: 06/06/2021] [Indexed: 06/13/2023]
Abstract
Ocean warming is altering the biogeographical distribution of marine organisms. In the tropics, rising sea surface temperatures are restructuring coral reef communities with sensitive species being lost. At the biogeographical divide between temperate and tropical communities, warming is causing macroalgal forest loss and the spread of tropical corals, fishes and other species, termed "tropicalization". A lack of field research into the combined effects of warming and ocean acidification means there is a gap in our ability to understand and plan for changes in coastal ecosystems. Here, we focus on the tropicalization trajectory of temperate marine ecosystems becoming coral-dominated systems. We conducted field surveys and in situ transplants at natural analogues for present and future conditions under (i) ocean warming and (ii) both ocean warming and acidification at a transition zone between kelp and coral-dominated ecosystems. We show that increased herbivory by warm-water fishes exacerbates kelp forest loss and that ocean acidification negates any benefits of warming for range extending tropical corals growth and physiology at temperate latitudes. Our data show that, as the combined effects of ocean acidification and warming ratchet up, marine coastal ecosystems lose kelp forests but do not gain scleractinian corals. Ocean acidification plus warming leads to overall habitat loss and a shift to simple turf-dominated ecosystems, rather than the complex coral-dominated tropicalized systems often seen with warming alone. Simplification of marine habitats by increased CO2 levels cascades through the ecosystem and could have severe consequences for the provision of goods and services.
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Affiliation(s)
- Sylvain Agostini
- Shimoda Marine Research Center, University of Tsukuba, Shimoda, Shizuoka, Japan
| | - Ben P Harvey
- Shimoda Marine Research Center, University of Tsukuba, Shimoda, Shizuoka, Japan
| | - Marco Milazzo
- Dipartimento di Scienze della Terra e del Mare, University of Palermo, Palermo, Italy
- Consorzio Nazionale Interuniversitario per le Scienze del Mare (CoNISMa, Rome, Italy
| | - Shigeki Wada
- Shimoda Marine Research Center, University of Tsukuba, Shimoda, Shizuoka, Japan
| | - Koetsu Kon
- Shimoda Marine Research Center, University of Tsukuba, Shimoda, Shizuoka, Japan
| | - Nicolas Floc'h
- Ecole Européenne Supérieure d'Art de Bretagne, Rennes, France
| | - Kosei Komatsu
- Atmosphere and Ocean Research Institute, University of Tokyo, Kashiwa, Japan
| | - Mayumi Kuroyama
- Atmosphere and Ocean Research Institute, University of Tokyo, Kashiwa, Japan
| | - Jason M Hall-Spencer
- Shimoda Marine Research Center, University of Tsukuba, Shimoda, Shizuoka, Japan
- Marine Biology and Ecology Research Centre, University of Plymouth, Plymouth, UK
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4
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Transcriptional changes revealed water acidification leads to the immune response and ovary maturation delay in the Chinese mitten crab Eriocheir sinensis. COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY D-GENOMICS & PROTEOMICS 2021; 39:100868. [PMID: 34171686 DOI: 10.1016/j.cbd.2021.100868] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2021] [Revised: 06/07/2021] [Accepted: 06/08/2021] [Indexed: 12/13/2022]
Abstract
Nowadays, due to increasing carbon dioxide released, water acidification poses a series of serious impacts on aquatic organisms. To evaluate the effects of water acidification on crustaceans, we focused on the Chinese mitten crab Eriocheir sinensis, which is a spawning migration and farmed species in China. Based on histological and oocyte transparent liquid observation, we found that the acidified environment significantly delayed the ovarian maturation of E. sinensis. Moreover, RNA-seq was applied to obtain gene expression profile from the crab's gills and ovaries in response to acidified environment. Compared with control groups, a total of 5471 differentially expressed genes (DEGs) were identified in acidified gills and 485 DEGs were identified in acidified ovaries. Enrichment analysis indicated that some pathways also responded to the acidified environment, such as PI3K-Akt signaling pathway, Chemokine signaling pathway, apoptosis, and toll-like receptor signaling pathway. Subsequently, some DEGs involved in immune response (ALF, Cathepsin A, HSP70, HSP90, and catalase) and ovarian maturation (Cyclin B, Fem-1a, Fem-1b, and Fem-1c) were selected to further validate the influence of water acidification on gene expression by qRT-PCR. The results showed that the expression level of immune-related genes was significantly increased to response to the water acidification, while the ovarian maturation-related genes were significantly decreased. Overall, our data suggested that E. sinensis was sensitive to the reduced pH. This comparative transcriptome also provides valuable molecular information on the mechanisms of the crustaceans responding to acidified environment.
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5
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Harvey BP, Kon K, Agostini S, Wada S, Hall-Spencer JM. Ocean acidification locks algal communities in a species-poor early successional stage. GLOBAL CHANGE BIOLOGY 2021; 27:2174-2187. [PMID: 33423359 DOI: 10.1111/gcb.15455] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2020] [Accepted: 11/13/2020] [Indexed: 06/12/2023]
Abstract
Long-term exposure to CO2 -enriched waters can considerably alter marine biological community development, often resulting in simplified systems dominated by turf algae that possess reduced biodiversity and low ecological complexity. Current understanding of the underlying processes by which ocean acidification alters biological community development and stability remains limited, making the management of such shifts problematic. Here, we deployed recruitment tiles in reference (pHT 8.137 ± 0.056 SD) and CO2 -enriched conditions (pHT 7.788 ± 0.105 SD) at a volcanic CO2 seep in Japan to assess the underlying processes and patterns of algal community development. We assessed (i) algal community succession in two different seasons (Cooler months: January-July, and warmer months: July-January), (ii) the effects of initial community composition on subsequent community succession (by reciprocally transplanting preestablished communities for a further 6 months), and (iii) the community production of resulting communities, to assess how their functioning was altered (following 12 months recruitment). Settlement tiles became dominated by turf algae under CO2 -enrichment and had lower biomass, diversity and complexity, a pattern consistent across seasons. This locked the community in a species-poor early successional stage. In terms of community functioning, the elevated pCO2 community had greater net community production, but this did not result in increased algal community cover, biomass, biodiversity or structural complexity. Taken together, this shows that both new and established communities become simplified by rising CO2 levels. Our transplant of preestablished communities from enriched CO2 to reference conditions demonstrated their high resilience, since they became indistinguishable from communities maintained entirely in reference conditions. This shows that meaningful reductions in pCO2 can enable the recovery of algal communities. By understanding the ecological processes responsible for driving shifts in community composition, we can better assess how communities are likely to be altered by ocean acidification.
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Affiliation(s)
- Ben P Harvey
- Shimoda Marine Research Center, University of Tsukuba, Shizuoka, Japan
| | - Koetsu Kon
- Shimoda Marine Research Center, University of Tsukuba, Shizuoka, Japan
| | - Sylvain Agostini
- Shimoda Marine Research Center, University of Tsukuba, Shizuoka, Japan
| | - Shigeki Wada
- Shimoda Marine Research Center, University of Tsukuba, Shizuoka, Japan
| | - Jason M Hall-Spencer
- Shimoda Marine Research Center, University of Tsukuba, Shizuoka, Japan
- Marine Biology and Ecology Research Centre, University of Plymouth, Plymouth, UK
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6
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Ani CJ, Robson B. Responses of marine ecosystems to climate change impacts and their treatment in biogeochemical ecosystem models. MARINE POLLUTION BULLETIN 2021; 166:112223. [PMID: 33730556 DOI: 10.1016/j.marpolbul.2021.112223] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/23/2020] [Revised: 02/18/2021] [Accepted: 02/25/2021] [Indexed: 06/12/2023]
Abstract
To predict the effects of climate change on marine ecosystems and the effectiveness of intervention and mitigation strategies, we need reliable marine ecosystem response models such as biogeochemical models that reproduce climate change effects. We reviewed marine ecosystem parameters and processes that are modified by climate change and examined their representations in biogeochemical ecosystem models. The interactions among important aspects of marine ecosystem modelling are not often considered due to complexity: these include the use of multiple IPCC scenarios, ensemble modelling approach, independent calibration datasets, the consideration of changes in cloud cover, ocean currents, wind speed, sea-level rise, storm frequency, storm intensity, and the incorporation of species adaptation to changing environmental conditions. Including our recommendations in future marine modelling studies could help improve the accuracy and reliability of model predictions of climate change impacts on marine ecosystems.
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Affiliation(s)
- Chinenye J Ani
- College of Science and Engineering, James Cook University, Townsville, QLD 4811, Australia; Australian Institute of Marine Science, Townsville, PMB3, Townsville, QLD 4810, Australia; AIMS@JCU, Australian Institute of Marine Science, College of Science and Engineering, James Cook University, Townsville, QLD, 4811, Australia.
| | - Barbara Robson
- Australian Institute of Marine Science, Townsville, PMB3, Townsville, QLD 4810, Australia
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7
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Boco SR, Pitt KA, Melvin SD. Coastal acidification and deoxygenation enhance settlement but do not influence movement behaviour of creeping polyps of the Irukandji jellyfish, Alatina alata (Cubozoa). MARINE ENVIRONMENTAL RESEARCH 2020; 162:105175. [PMID: 33070064 DOI: 10.1016/j.marenvres.2020.105175] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/30/2020] [Revised: 09/06/2020] [Accepted: 10/06/2020] [Indexed: 06/11/2023]
Abstract
Deoxygenation and acidification co-occur in many coastal ecosystems because nutrient enrichment produces excess organic matter that intensifies aerobic respiration during decomposition, thereby depleting O2, increasing CO2 and lowering pH. Despite this link between coastal deoxygenation (CD) and acidification (CA), and evidence that both stressors pose a risk to marine fauna, few studies have examined the effects of these drivers in combination on marine animals including invertebrates. Here, we studied the individual and combined effects of CD (~1.5 mg L-1 O2) and CA (~7.7 pH) on the survival, number of tentacles, settlement and movement behaviours of creeping polyps of the Irukandji jellyfish, Alatina alata. Low DO increased the survival rate (17% more) of the creeping polyps. 12% more creeping polyps settled in low pH than ambient pH and 16.7% more settled in low DO than ambient DO treatment. Exposure to CA and CD did not influence the number of tentacles, mobility or movement velocity of the creeping polyps, but after 4 h exposure to the treatments, they moved approximately half as fast. Our results indicate that CD can enhance survival and settlement success, but CA does not intensify these outcomes on A. alata creeping polyps.
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Affiliation(s)
- Sheldon Rey Boco
- Australian Rivers Institute, School of Environment and Science, Griffith University, Southport, Queensland, 4215, Australia.
| | - Kylie A Pitt
- Australian Rivers Institute, School of Environment and Science, Griffith University, Southport, Queensland, 4215, Australia
| | - Steven D Melvin
- Australian Rivers Institute, School of Environment and Science, Griffith University, Southport, Queensland, 4215, Australia
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8
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Cattano C, Agostini S, Harvey BP, Wada S, Quattrocchi F, Turco G, Inaba K, Hall-Spencer JM, Milazzo M. Changes in fish communities due to benthic habitat shifts under ocean acidification conditions. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 725:138501. [PMID: 32298893 DOI: 10.1016/j.scitotenv.2020.138501] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2020] [Revised: 03/27/2020] [Accepted: 04/04/2020] [Indexed: 06/11/2023]
Abstract
Ocean acidification will likely change the structure and function of coastal marine ecosystems over coming decades. Volcanic carbon dioxide seeps generate dissolved CO2 and pH gradients that provide realistic insights into the direction and magnitude of these changes. Here, we used fish and benthic community surveys to assess the spatio-temporal dynamics of fish community properties off CO2 seeps in Japan. Adding to previous evidence from ocean acidification ecosystem studies conducted elsewhere, our findings documented shifts from calcified to non-calcified habitats with reduced benthic complexity. In addition, we found that such habitat transition led to decreased diversity of associated fish and to selection of those fish species better adapted to simplified ecosystems dominated by algae. Our data suggest that near-future projected ocean acidification levels will oppose the ongoing range expansion of coral reef-associated fish due to global warming.
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Affiliation(s)
- Carlo Cattano
- Department of Earth and Marine Sciences (DiSTeM), University of Palermo, via Archirafi 20-22, 90123 Palermo, Italy; CoNISMa (Interuniversity Consortium of Marine Sciences), Piazzale Flaminio 9, 00196 Rome, Italy.
| | - Sylvain Agostini
- Shimoda Marine Research Center, University of Tsukuba, 5-10-1 Shimoda, 415-0025 Shizuoka, Japan
| | - Ben P Harvey
- Shimoda Marine Research Center, University of Tsukuba, 5-10-1 Shimoda, 415-0025 Shizuoka, Japan
| | - Shigeki Wada
- Shimoda Marine Research Center, University of Tsukuba, 5-10-1 Shimoda, 415-0025 Shizuoka, Japan
| | - Federico Quattrocchi
- IRBIM - Istituto per le Risorse Biologiche e le Biotecnologie Marine, CNR - National Research Council, Via Luigi Vaccara 61, 91026 Mazara del Vallo, TP, Italy
| | - Gabriele Turco
- Department of Earth and Marine Sciences (DiSTeM), University of Palermo, via Archirafi 20-22, 90123 Palermo, Italy; CoNISMa (Interuniversity Consortium of Marine Sciences), Piazzale Flaminio 9, 00196 Rome, Italy
| | - Kazuo Inaba
- Shimoda Marine Research Center, University of Tsukuba, 5-10-1 Shimoda, 415-0025 Shizuoka, Japan
| | - Jason M Hall-Spencer
- Shimoda Marine Research Center, University of Tsukuba, 5-10-1 Shimoda, 415-0025 Shizuoka, Japan; Marine Biology and Ecology Research Centre, University of Plymouth, Plymouth, PL4 8AA, UK
| | - Marco Milazzo
- Department of Earth and Marine Sciences (DiSTeM), University of Palermo, via Archirafi 20-22, 90123 Palermo, Italy; CoNISMa (Interuniversity Consortium of Marine Sciences), Piazzale Flaminio 9, 00196 Rome, Italy
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