BC OAH ACTION PLAN In 2023, the Province of British Columbia completed the BC Ocean Acidification and Hypoxia Action Plan . The BC OAH Action Plan was developed in response to a 2019 provincial Preliminary Strategic Climate Risk Assessment (as a part of B.C.’s Climate Preparedness and Adaptation Strategy) that identified ocean acidification as a significant climate change-related risk to the Province's seafood sector. The Province then launched the Climate Ready BC Seafood Program , managed by the Tula Foundation, which provides $1.7 million in funding over two years (April 1, 2024 - March 31, 2026) for eleven projects that support the actions of the BC OAH Action Plan. A BC OAH Action Forum will be held on March 3, 2026 to assess achievements of the Climate Ready BC Seafood Program, identify next steps and priority actions needed, and foster collaboration to continue advancing OAH initiatives in BC. Learn more: BC OAH Action Plan Scientific Assessment for the BC OAH Action Plan Climate Ready BC Seafood Program webpage BC OAH Action Forum event page

VIDEO TUTORIAL: MAP OF CANADA'S OA RESOURCES

OA IN CANADA EXPERT DATABASE In an effort to improve connections between ocean acidification researchers, community members, and OA resources, the OA CoP has created an online public database of OA experts across Canada. Please feel free to explore and let us know what you think! For people who would like to add themselves to our database, we have created a Google form for you to fill out your desired contact information and details on your areas of research/expertise. You have the option to include or exclude your email address. Once you submit this form, we will then add you to our public OA in Canada Expert database (see below). Our eventual goal is to make this database more interactive, including potentially developing a geographic map of experts and/or the areas/facilities where they conduct their research. Feedback and suggestions are always welcome as we develop these resources (email coordinator@oceanacidification.ca ). If you are interested, you can also join Team Canada on the OA Info Exchange . Details are included in the form. Add yourself to our database

SPECIES IMPACTS DUNGENESS CRAB AMERICAN LOBSTER PACIFIC OYSTER NORTHERN SHRIMP PINK SALMON SEAFOOD INDUSTRY OTHER SPECIES

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About the Collaboration The DFO/NOAA Ocean Acidification Collaboration is an ongoing effort to build an interagency framework between DFO and NOAA to coordinate research efforts in OA monitoring, modelling, and experimentation, as well as data and information sharing between the two federal agencies. Between November 2022 - May 2023, the Collaboration provided funding for the activities of Canada’s OA CoP, including the creation of outreach materials to jumpstart the DFO/NOAA OA Collaboration's ability to engage with stakeholders and potential members. Below, you will find examples of these activities, such as two-page poster highlights on some of the DFO/NOAA collaborative research projects and scientists who lead these initiatives, as well as a resource library. To learn more about the collaborative framework for joint DFO/NOAA ocean acidification research and monitoring, please visit DFO’s webpage on the collaboration here . Project Highlights Canada/US OA Resources Project Highlights DFO/NOAA OA COLLABORATION PROJECT HIGHLIGHTS Sally E Chris C Thomas H Emily S Halle B For more information about: "Impacts of Ocean Acidification on the Atlantic Sea Scallop" reach out to the lead scientists! Also check out this regional vulnerability assessment that project lead Halle Berger is working on for her PhD "Assessing Vulnerability of the Atlantic Sea Scallop Social-Ecological System in the Northeast Waters of the US" (funded by NOAA OAP) by clicking here! For more information about: "Impacts of coastal acidification and climate change stressors on the Atlantic sea scallop: larval supply, recruitment and adaptive capacity to multiple global change drivers" reach out to the lead scientists! Canada/US OA Resources CANADA/US OA RESOURCES BC OAH Action Plan The BC OAH Action aims to determine the state of knowledge related to ocean acidification and hypoxia in BC’s coastal waters, with long-term goals for addressing knowledge gaps and developing adaptation and mitigation strategies to support the fisheries and aquaculture sectors, traditional harvesters, and other BC seafood interests. Tsleil-Waututh Nation’s Climate Action Initiatives Tsleil-Waututh members have observed the effects of climate change in our territory for decades. OA is a concern to TWN, along with other ocean-related effects of climate change. Burrard Inlet is becoming more acidic, and research is underway to determine whether the cause is disproportionately associated with OA or if the reduction in pH is attributed to urban and industrial inputs. Acidification in Our Oceans This infographic developed by NOAA aims to teach the basics of ocean acidification and to provide information on what the reader can do to help this global problem. Ocean Acidification Building Blocks of the Sea This educational resource from NOAA, OAP and the National Marine Sanctuaries aims to have students understand the impact human activities can have on the chemistry/health of the ocean, and how changes in ocean ecosystems impact ocean and human life. Understanding Ocean and Coastal Acidification: Teacher Resources Through the lessons in this module, designed for grades 9-12, students will explore relationships between carbon dioxide, ocean pH and aragonite saturation state Coastal Acidification Interactive Story This educational module from NOAA is an interactive way to learn about the impacts of humans changing water chemistry. This module specifically focuses on how changing water chemistry results in coastal acidification Commonwealth Blue Charter: Ocean Acidification Action Group The Commonwealth Blue Charter is an agreement by all 54 Commonwealth countries, adopted at the Commonwealth Heads of Government Meeting in London, April 2018. New Zealand will champion the Ocean Acidification Action Group –improving the capacity of Commonwealth countries to address the impact of ocean acidification. OA CoP Educational Resource: How to make a Homemade pH Indicator in 5 Steps Educational Resource: How to make homemade pH strips in 5 easy steps Watch our new video on our YouTube channel or our tiktok to learn how to run the experiment DFO:What is Ocean Acidification? Ocean acidification is a global threat with potential impacts on marine food webs, ecosystem productivity, commercial fisheries and global food security. This threat has prompted the international scientific community, including Fisheries and Oceans Canada, to investigate the implications of this significant international governance issue. GOA-ON Pier2Peer Program Pier2Peer is a GOA-ON program that matches early career scientists with senior researchers across the globe. This program provides opportunities for knowledge exchange, conferences scholarships post doc positions and more! BC Climate Preparedness and Adaptation Strategy B.C.’s Climate Preparedness and Adaptation Strategy outlines four pathways to help ensure we stay safe and to prepare for a changing climate. The strategy highlights B.C.'s overall direction and actions that the Province is taking to help better understand and adapt to the impacts of climate change, and is supported by more than $500 million in funding. Alaska OA Network- Downloadable Resources The Alaska Ocean Acidification Network has created numerous infographics and downloadable visual resources. Check out these resources on their website! In 2019, the City of Vancouver declared a climate emergency, and in response focused on drastically cutting the city’s greenhouse gas emissions. The City of Vancouver has also registered our ocean acidification Framework, as a Voluntary Commitment to help support the implementation of the UN Sustainable Development Goal 14, Life Below Water. Vancouver Action Plan Baynes Sound Data This project aims to better understand the short- and long-term variability that occurs within these productive waters. With more data, it is hoped that producers will have the information needed to make the best decisions for their harvest. This online resource gives users access to real time ocean monitoring data in Baynes Sound. Understanding OA Learn how our oceans are absorbing increasingly more carbon dioxide from the atmosphere, leading to lower pH and greater acidity with this educational resource from NOAA. Ocean acidification is fundamentally changing the chemistry of the world’s oceans and threatening our marine resources. Whale Jenga: A Food Web Game This educational resource from NOAA and the National Marine Sanctuaries aims to have students understand how organis ms are connected through the marine food web and how small changes to to food webs can have larger scale impacts. DITC CIA Worksheet: How Does Rising CO2 Impact Ocean pH? This "Data in the Classroom" (DITA) worksheet aims to teach the impacts of CO2 on the ocean by studying important graphs and figures, which encourages students to think deeper about ocean chemistry. Crabs in a Changing Ocean This infographic from NOAA and National Marine sanctuaries, outlines how crabs will be impacted by changing water chemistry and what you can do to help! OA Alliance The OA Alliance is an international organization whose goal is to create a network of governments and organizations. They use this network to take action against the growing threat of Ocean Acidification to protect coastal communities all over the world. Create an Ocean Acidification Action Plan! Action Plans can be used by more people than just governments, they can be used by any individual or group that is faced with a problem! We have created an educational resource outlining how to design a Action plan of your own that can be used to address OA in your community and beyond! This resource is targeted for students but could be used by anyone looking to make an action plan! Ocean Acidification Information Exchange Have professional questions about OA, how to conduct research, data set, and more? Connect with the Canadian and global OA communities here! GOA-ON Data Explorer The GOA-ON data portal "provides access and visualization to ocean acidification data and data synthesis products being collected around the world from a wide range of sources, including moorings, research cruises, and fixed time series stations" and represents them as an easy-to-use map. The map contains worldwide (and in some cases also real-time!) data and observation assets which are represented as interactive icons. Climate Change and Ocean Acidification: Olympic Coast- Video In recent years, shellfish growers in Washington state have needed to develop monitoring and treatment practices to avoid spawning failures that have been linked to periodic upwelling of more acidic ocean waters. Read this overview of OA research on the Olympic coast! The Olympic Coast as a Sentinel Video This webinar funded by the NOAA OAP focuses on regional vulnerability assessment and the 4 Olympic Coast Tribes who depend on local marine species that are at risk from ocean acidification. B.C. is focused on implementing CleanBC; the actions and commitments in CleanBC will reduce the causes of ocean acidification and help to build adaptation and resiliency of coastal communities BC OA Case Study Back to Blue Initiative: An Ocean Crisis in the Making The Back to Blue Initiative has created an interactive webpage that educates the user on the basics of ocean acidification. These basics are broken down into an introduction, the science, the impacts, and soultions? Ocean Acidification: pH and the Ocean's Balance This educational resource from NOAA, OAP and the National Marine Sanctuaries aims to have students understand the pH is a measurement of ocean acidification, understand the pH scale, and the impacts that small changes to this scale can have. Dungeness Crab Case Study Resources Dungeness crab is a valuable species throughout the National Marine Sanctuaries of the West Coast from Washington state to throughout California. This communication toolkit is designed for educators and communicators to use to teach others about the impact of ocean acidification on Dungeness crab. NOAA: Ocean Acidification This NOAA webpage walks you through the basics of ocean acidification, highlighting the impacts on important organisms, and the current research in the USA. Commonwealth Blue Charter: Ocean Acidification Policymakers Handbook The Commonwealth Blue Charter helped put together an Ocean Acidification policymakers handbook. This contains many of the tools that a policy maker needs to be acquainted with to effectively make decisions about Ocean Acidification. UN Ocean Decade: OARS Ocean Acidification Research for Sustainability (OARS). The programme will address the SDG target 14.3 ‘Minimize and address the impacts of Ocean Acidification (OA), including through enhanced scientific cooperation at all levels’. DFO: Ocean Acidification Video This video from the DFO-Canada outlines how the levels of carbon dioxide in the atmosphere have continued to increase due to human activities, lowering the pH of the ocean and making it more acidic. This process of ocean acidification increasingly affects ecosystems and those communities that directly rely on the ocean. GOA-ON Sampling Standards Global Ocean Acidification Observing Network (GOA-ON) sampling standard gives guidance on the proper way to execute ocean acidification observations, to allow for data to be compared world wide. It also gives advice on what to kinds of data to collect and and how to submit to the SDG 14.3.1 Indicator, for world-wide comparison. OA-ICC Biological Response Portal This easy-to-use data repository and publication catalog focuses on biological response to ocean acidification. This resource allows you to easily search existing datasets through easy-to-use filters under the categories of Spatial information, Experimental information, Biological information, and Bibliographic information (as can be seen in the image below). Ocean Acidification Impact on Oysters and Other Shellfish-Video PMEL Carbon Program Video- The world's oceans are absorbing carbon dioxide at an unprecedented rate and the resulting acidification is transforming marine ecosystems. Hari Sreenivasan, of PBS NewsHour reports on how ocean acidification is already affecting oysters and other shellfish in the U.S. Keepin' it Real: Connecting Ocean Acidification to Watershed Health and Promoting Student Action- Video This webinar funded by the NOAA OAP focuses on using the "Virtual Urchin" education tool which can be used by students and teachers to see real lab data and an action module. NOAA Archived Webinars The National Oceanic and Atmospheric Association has a collection of archived educational webinars targeted at students and teachers available on their website. Click the image to begin exploring these resources.

Bringing together Canada's ocean acidification researchers, practitioners, policy-makers, & communities to share OA resources & expertise. Become a member of the Canadian OA Community of Practice today! BUILDING COMMUNITY INITIATING CHANGE REGIONS Stay up to date on current ocean acidification research, resources, facilities, and upcoming projects in your area! More Info RESOURCES Have a question about ocean acidification? Looking for more information on the resources and experts in your area? Stay tuned... More Info EVENTS Join us for online or in person conversations near you! View our upcoming event schedule and past event summaries... More Info OUR BLOG Featuring interviews with scientists, OA experts, and our OA CoP team, the latest in OA news, recaps of recent research, and more! More Info OUR MAP OF CANADA'S OA RESOURCES VISIT OUR MAP SAMANTHA JONES' POEM OCEAN ACIDIFICATION Click Here to Watch the Official Video RECENT UPDATES October 2025 Updates OA CoP 5 days ago OA Week 2025 OA CoP Oct 27 OA CoP Strategic Planning "What We Heard" Report OA CoP Oct 14 1 2 3 4 5 ABOUT US The Ocean Acidification Community of Practice was initiated in 2018 and is sponsored by the Marine Environmental Observation Prediction and Response (MEOPAR ) Network. MEOPAR Communities of Practice bring together researchers, practitioners, policy-makers, and community members to share expertise, to learn, and to provide a space for discussion and co-production of knowledge. Our goal is to foster a community that shares resources and co-produces knowledge related to ocean acidification across Canada and beyond. Learn More CONTACT US coordinator@oceanacidification.ca Submit Thanks for your inquiry! contact

SPECIES IMPACTS There are many species in Canada that are vulnerable to ocean acidification. Across the country, research is being conducted to understand how species respond to OA (and other co-stressors, such as changing ocean temperature and oxygen levels), but there are still many unknowns . Below are resources summarizing our current understanding of how species are responding to OA in Canada. Explore by Species Industry Impacts Explore by Region OA IN CANADA SPECIES IMPACTS American lobster Download our poster here! Pacific oyster Download our poster here! Pink salmon Download our poster here! Northern shrimp Download our poster here! Dungeness crab Download our poster here! Other Species Download our poster here! VIEW ALL POSTERS More species coming soon! EXPLORE MORE PAST POSTS FROM OUR MEET THE CRITTERS BLOG SERIES OA in Canada Species Impacts: Dungeness Crab OA in Canada Species Impacts: Other Species OA in Canada Species Impacts: Seafood Industry 1 2 3 4 5 FISHERIES AND AQUACULTURE IMPACTS Seafood Industry Download our poster here! $1,764 $889 $312 $119 $109 $68 $45 $31 $14 $500 $365 $196 $54 $29 $0.2 $0 $200 $400 $600 $800 $1,000 $1,200 $1,400 $1,600 $1,800 Lobster Salmon Shrimp Crab (Other) Clams Oyster Mussels* Herring Sea urchin Queen/snow crab Groundfish Scallop Pelagic fish (other) Shellfish (other) Others Value (Millions, CDN) Canada Seafood Industries ($4.5B) - Vulnerability to OA ■ Negative ($2.21B, 49%) ■ Mixed (negative - no effect) ($1.03B, 23%) ■ Mixed ($113M, 3%) ■ Unknown in Canada ($1.14B, 25%) FAST FACTS 25% ($1.14B) of seafood species in Canada require more research on OA impacts , such as: Queen/snow crab (11% or $500M) Scallops (4% or $196M) Fish ( 10% or $419M) 49% ($2.21B) of seafood species are negatively impacted by OA 23% ($1.03B) have reported mixed negative effects (negative - no effect) 3% ($113M) have mixed responses (negative - positive) Values reported here are based on seafisheries landings values and aquaculture production values reported by DFO in 2023: 1. https://www.dfo-mpo.gc.ca/stats/commercial/land-debarq/sea-maritimes/s2023pv-eng.htm 2. https://www.dfo-mpo.gc.ca/stats/aqua/aqua23-eng.html *Mussels include aquaculture only Seafood Industry Impacts by Province FISHERIES AND AQUACULTURE IMPACTS BY PROVINCE BC QC NB PEI NS NL $528 $73 $114 $80 $16 $4 $5 $8 $148 $1 $6 $9 $0 $100 $200 $300 $400 $500 $600 Salmon Shrimp Crab (Other) Clams Oyster Mussels* Herring Sea urchin Groundfish Scallop Pelagic fish (other) Shellfish (other) Value (Millions, CDN) BC Seafood Industries ($992M) - Vulnerability to OA ■ Negative ($195M, 20%) ■ Mixed (negative - no effect) ($613M, 62%) ■ Mixed ($21M, 2%) ■ Unknown in Canada ($164M, 16%) $242 $15 $2 $1 $3 $0.4 $1 $5 $78 $13 $3 $0.4 $0 $50 $100 $150 $200 $250 Lobster Shrimp Crab (Other) Clams Oyster Mussels* Herring Sea urchin Queen/snow crab Groundfish Scallop Pelagic fish (other) Value (Millions, CDN) Quebec Seafood Industries ($360M) - Vulnerability to OA ■ Negative ($264M, 73%) ■ Mixed (negative - no effect) ($2M, 1%) ■ Mixed ($3M, 1%) ■ Unknown in Canada ($94M, 26%) $290 $258 $3 $1 $0.2 $26 $4 $1 $68 $2 $15 $4 $0 $50 $100 $150 $200 $250 $300 Lobster Salmon Shrimp Crab (Other) Clams Oyster Herring Sea urchin Queen/snow crab Groundfish Scallop Pelagic fish (other) Value (Millions, CDN) NB Seafood Industries ($673M) - Vulnerability to OA ■ Negative ($295M, 44%) ■ Mixed (negative - no effect) ($263M, 39%) ■ Mixed ($26M, 4%) ■ Unknown in Canada ($89M, 13%) $290 $2 $1 $19 $29 $2 $24 $1 $0.04 $4 $0 $50 $100 $150 $200 $250 $300 Lobster Crab (Other) Clams Oyster Mussels* Herring Queen/snow crab Groundfish Scallop Pelagic fish (other) Value (Millions, CDN) PEI Seafood Industries ($372M) - Vulnerability to OA ■ Negative ($291M, 78%) ■ Mixed (negative - no effect) ($3M, 1%) ■ Mixed ($48M, 13%) ■ Unknown in Canada ($30M, 8%) $821 $103 $69 $1 $27 $4 $3 $10 $77 $120 $174 $27 $0 $100 $200 $300 $400 $500 $600 $700 $800 $900 Lobster Salmon Shrimp Crab (Other) Clams Oyster Mussels* Herring Queen/snow crab Groundfish Scallop Pelagic fish (other) Value (Millions, CDN) NS Seafood Industries ($1.4B) - Vulnerability to OA ■ Negative ($891M, 62%) ■ Mixed (negative - no effect) ($140M, 10%) ■ Mixed ($7M, 0.5%) ■ Unknown in Canada ($397M, 28%) $121 $153 $8 $9 $1 $253 $82 $3 $13 $20 $0.2 $0 $50 $100 $150 $200 $250 $300 Lobster Shrimp Mussels* Herring Sea urchin Queen/snow crab Groundfish Scallop Pelagic fish (other) Shellfish (other) Others Value (Millions, CDN) NL Seafood Industries ($662M) - Vulnerability to OA ■ Negative ($271M, 41%) ■ Mixed (negative - no effect) ($9M, 1%) ■ Mixed ($8M, 1%) ■ Unknown in Canada ($371M, 56%) EXPLORE SPECIES IMPACTS BY REGION PACIFIC Pacific oyster Download our poster here! Pink salmon Download our poster here! Northern shrimp Download our poster here! Dungeness crab Download our poster here! Other Species Download our poster here! ARCTIC Northern shrimp Download our poster here! Other Species Download our poster here! ATLANTIC American lobster Download our poster here! Northern shrimp Download our poster here! Other Species Download our poster here Seafood Industry Impacts by Province CITATIONS See our OA in Canada Publications Database Klymasz-Swartz, A. K. et al. Impact of climate change on the American lobster (Homarus americanus): Physiological responses to combined exposure of elevated temperature and pCO2. Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology 235, 202–210 (2019). Menu-Courey, K. et al. Energy metabolism and survival of the juvenile recruits of the American lobster (Homarus americanus) exposed to a gradient of elevated seawater pCO2. Marine Environmental Research 143, 111–123 (2019). Keppel, E. A., Scrosati, R. A. & Courtenay, S. C. Ocean acidification decreases growth and development in American lobster (Homarus americanus) larvae. Journal of Northwest Atlantic Fishery Science 44, 61–66 (2012). Noisette, F. et al. Tolerant Larvae and Sensitive Juveniles: Integrating Metabolomics and Whole-Organism Responses to Define Life-Stage Specific Sensitivity to Ocean Acidification in the American Lobster. Metabolites 11, 584 (2021). Tai, T. C., Calosi, P., Gurney-Smith, H. J. & Cheung, W. W. L. Modelling ocean acidification effects with life stage-specific responses alters spatiotemporal patterns of catch and revenues of American lobster, Homarus americanus. Sci Rep 11, 23330 (2021). Frommel, A. Y., Carless, J., Hunt, B. P. V. & Brauner, C. J. Physiological resilience of pink salmon to naturally occurring ocean acidification. Conservation Physiology 8, 1–13 (2020). Ou, M. et al. Responses of pink salmon to CO2-induced aquatic acidification. Nature Climate Change 5, 950–957 (2015). Chemel, M. et al. Good News — Bad News: Combined Ocean Change Drivers Decrease Survival but Have No Negative Impact on Nutritional Value and Organoleptic Quality of the Northern Shrimp. Frontiers in Marine Science 7, 1–13 (2020). Guscelli, E. et al. Northern shrimp from multiple origins show similar sensitivity to global change drivers, but different cellular energetic capacity. Journal of Experimental Biology 226, jeb245400 (2023). Guscelli, E., Chabot, D., Vermandele, F., Madeira, D. & Calosi, P. All roads lead to Rome: inter-origin variation in metabolomics reprogramming of the northern shrimp exposed to global changes leads to a comparable physiological status. Front. Mar. Sci. 10, 1170451 (2023). Hans, S., Fehsenfeld, S., Treberg, J. R. & Weihrauch, D. Acid-base regulation in the Dungeness crab (Metacarcinus magister). Marine Biology 161, 1179–1193 (2014). Durant, A., Khodikian, E. & Porteus, C. S. Ocean acidification alters foraging behaviour in Dungeness crab through impairment of the olfactory pathway. Global Change Biology 29, 4126–4139 (2023). Fehsenfeld, S. et al. Effects of elevated seawater pCO2 on gene expression patterns in the gills of the green crab, Carcinus maenas. (2011). Clements, J. C. & Hunt, H. L. Influence of sediment acidification and water flow on sediment acceptance and dispersal of juvenile soft-shell clams (Mya arenaria L.). Journal of Experimental Marine Biology and Ecology 453, 62–69 (2014). Clements, J. C. & Hunt, H. L. Testing for sediment acidification effects on within-season variability in juvenile soft-shell clam (Mya arenaria) abundance on the Northern shore of the Bay of Fundy. Estuaries and Coasts 41, 471–483 (2018). Clements, J. C., Woodard, K. D. & Hunt, H. L. Porewater acidification alters the burrowing behavior and post-settlement dispersal of juvenile soft-shell clams (Mya arenaria). Journal of Experimental Marine Biology and Ecology 477, 103–111 (2016). Clements, J. C., Bishop, M. M. & Hunt, H. L. Elevated temperature has adverse effects on GABA-mediated avoidance behaviour to sediment acidification in a wide-ranging marine bivalve. Marine Biology 164, 56 (2017). McGarrigle, S. A., Bishop, M. M., Dove, S. L. & Hunt, H. L. Effects of sediment and water column acidification on growth, survival, burrowing behaviour, and GABAA receptor function of benthic invertebrates. Journal of Experimental Marine Biology and Ecology 566, 151918 (2023). McGarrigle, S. A. & Hunt, H. L. Effects of semidiurnal water column acidification and sediment presence on growth and survival of the bivalve Mya arenaria. Journal of Experimental Marine Biology and Ecology 562, 151872 (2023). Clements, J. C. et al. Short-term exposure to elevated pCO2 does not affect the valve gaping response of adult eastern oysters, Crassostrea virginica, to acute heat shock under an ad libitum feeding regime. Journal of Experimental Marine Biology and Ecology 506, 9–17 (2018). Clements, J. C., Bourque, D., McLaughlin, J., Stephenson, M. & Comeau, L. A. Extreme ocean acidification reduces the susceptibility of eastern oyster shells to a polydorid parasite. Journal of Fish Diseases 40, 1573–1585 (2017). Clements, J. C., Carver, C. E., Mallet, M. A., Comeau, L. A. & Mallet, A. L. CO2-induced low pH in an eastern oyster ( Crassostrea virginica ) hatchery positively affects reproductive development and larval survival but negatively affects larval shape and size, with no intergenerational linkages. ICES Journal of Marine Science 78, 349–359 (2021). Nordio, D. et al. Adaption potential of Crassostrea gigas to ocean acidification and disease caused by Vibrio harveyi. ICES Journal of Marine Science 78, 360–367 (2021). Wright-LaGreca, M., Mackenzie, C. & Green, T. J. Ocean Acidification Alters Developmental Timing and Gene Expression of Ion Transport Proteins During Larval Development in Resilient and Susceptible Lineages of the Pacific Oyster (Crassostrea gigas). Mar Biotechnol 24, 116–124 (2022). Brown, N. E. M., Bernhardt, J. R. & Harley, C. D. G. Energetic context determines species and community responses to ocean acidification. Ecology 101, e03073 (2020). Zhong, K. X. et al. The prokaryotic and eukaryotic microbiome of Pacific oyster spat is shaped by ocean warming but not acidification. Appl Environ Microbiol 90, e00052-24 (2024). Keppel, E. A., Scrosati, R. A. & Courtenay, S. C. Interactive effects of ocean acidification and warming on subtidal mussels and sea stars from Atlantic Canada. Marine Biology Research 11, 337–348 (2014). Clements, J. C., Hicks, C., Tremblay, R. & Comeau, L. A. Elevated seawater temperature, not pCO2, negatively affects post-spawning adult mussels (Mytilus edulis) under food limitation. Conservation Physiology 6, (2018). Brown, N. E. M., Therriault, T. W. & Harley, C. D. G. Field‐based experimental acidification alters fouling community structure and reduces diversity. Journal of Animal Ecology 85, 1328–1339 (2016). Sunday, J. M., Crim, R. N., Harley, C. D. G. & Hart, M. W. Quantifying rates of evolutionary adaptation in response to ocean acidification. PLoS ONE 6, 1–8 (2011). Thyrring, J. et al. Ocean acidification increases susceptibility to sub-zero air temperatures in ecosystem engineers and limits poleward range shifts. eLife 12, e81080 (2023). Frommel, A. Y., Lye, S. L. R., Brauner, C. J. & Hunt, B. P. V. Air exposure moderates ocean acidification effects during embryonic development of intertidally spawning fish. Sci Rep 12, 12270 (2022).

BECOME A MEMBER Sign up for our e-mail list to receive updates on our events, receive our quarterly newsletters, and hear about important updates! Contact Us Join Team Canada Join us on the OA Info Exchange To receive more updates from the OA CoP and connect with the international OA community, please sign up for Team Canada on the OA Info Exchange! Join the OA Info Exchange How to join Team Canada on the OA Info Exchange: 1. Click the above button to request access and register for an OAIE account. 2. Once you've registered an account and have logged in, navigate to the TEAMS page. 3. On the TEAMS page, scroll down to Region Based Teams . Click on team CANADA . 4. On the TEAM CANADA page, click on the "JOIN TEAM " button on the top right corner of the page. 5. Congratulations! You've successfully joined TEAM CANADA! Follow us on social media!

SPONSORS AND PARTNERSHIPS FUNDERS The Ocean Acidification Community of Practice was initially formed in 2018 as part of Canada's Marine Environmental Observation Prediction and Response (MEOPAR) Network's efforts to form targeted communities of practice focused on knowledge mobilization and bringing together interdisciplinary groups to share resources and advance ocean research and community efforts across Canada. MEOPAR continues to support the OA CoP most recently as part of their Strategic Science Fund award. SPONSORS The OA CoP is a UN Decade of Ocean Science for Sustainable Development endorsed project under the Ocean Acidification Research for Sustainability (OARS) Programme. PARTNERS AND COLLABORATORS

RESOURCES New! OA CoP Strategic Planning "What We Heard" Report Read the final "What We Heard " report from our OA CoP community strategic planning meeting held in April, 2025! New! OA in Canada Publications Database Browse our database of OA in Canada publications. Zotero version available! Webinars and Videos Want to learn more about OA resources and work happening across Canada? Explore our past webinars and video resources! External Resources Check out our list of OA, climate action, and ocean-based resources from Canada and beyond! New! Species Impacts Resources Browse our Species Impacts page to learn about our current knowledge of OA impacts of species and seafood industries in Canada! OA Action Plans in Canada Learn more about some of the existing OA action plans in Canada and explore resources to help make your own! Ocean Acidification a poem by Samantha Jones The poem “Ocean Acidification” blends science and poetry to explore the challenges a high-CO2 world poses to our world. Share your OA Projects! Working on an OA project you want us to share with the OA community in Canada? Share it here! New! OA in Canada Expert Database Looking to connect with an OA expert on a particular topic in your area? Explore our expert database! Map of Canada's OA Resources Discover more about the people, facilities, current and past projects investigating OA in your area! DFO-NOAA Collaboration Resources Explore resources created to highlight the research, activities, and initiatives supported by the DFO/NOAA OA Collaboration!