Climate Risks Threaten Marine Ecosystems: UPSC & PCS Analysis

04 Nov Climate Risks Threaten Marine Ecosystems: UPSC & PCS Analysis

✎ Climate risks, including warming seas and marine heatwaves, pose significant threats to marine ecosystems and livelihoods, necessitating integrated monitoring and early warning systems.

Subject Relevance — Where This Topic Fits

• GS Paper I — Geography (Physical Geography, Oceanography)  |  GS Paper III — Environment and Ecology (Conservation, Environmental Pollution and Degradation, Environmental Impact Assessment)  |  GS Paper III — Science and Technology (Remote Sensing, Artificial Intelligence)
• Prelims: Marine heatwaves, Coral bleaching, Algal blooms, Central Marine Fisheries Research Institute (CMFRI), Satellite remote sensing, Oceanographic observations
• Essay: The imperative of integrating technology for environmental sustainability and disaster mitigation., Climate change impacts on livelihoods and the global economy: A multi-sectoral challenge.

Quick Revision: Climate risks, including warming seas and marine heatwaves, pose significant threats to marine ecosystems and livelihoods, necessitating integrated monitoring and early warning systems.

Why is this in the news?

Marine scientists recently convened at a symposium hosted by the Central Marine Fisheries Research Institute (CMFRI) to discuss the escalating threats posed by climate risks to marine ecosystems. Experts highlighted the detrimental effects of warming seas, marine heatwaves, and coral bleaching on fisheries and coastal livelihoods, advocating for an integrated approach involving satellite data, climate models, and artificial intelligence for enhanced ocean monitoring and early warning systems.

Background

• Global oceans have absorbed a significant portion of the excess heat generated by anthropogenic greenhouse gas emissions, leading to rising sea temperatures.
• Marine heatwaves, defined as prolonged periods of unusually warm ocean temperatures, are increasing in frequency, intensity, and duration, causing widespread ecological disruption.
• Coral reefs, vital marine habitats, are particularly vulnerable to thermal stress, which induces coral bleaching events, often leading to coral mortality and ecosystem degradation.
• Changes in ocean conditions, including acidification and altered current patterns, are impacting the distribution and abundance of fish populations, affecting global fisheries.
• Harmful algal blooms (HABs), often exacerbated by warmer waters and nutrient runoff, can deplete oxygen, produce toxins, and cause mass mortality of marine life, posing risks to human health and aquaculture.
• Coastal communities globally are highly dependent on healthy marine ecosystems for food security, economic activities, and protection from extreme weather events, making these climate impacts a significant socio-economic concern.

Understanding Climate Risks to Marine Ecosystems

• Climate risks to marine ecosystems encompass a range of environmental changes driven by global warming, primarily manifested as rising ocean temperatures, ocean acidification, and altered ocean circulation patterns.
• Warming seas contribute to thermal expansion of water, leading to sea-level rise, and also reduce the ocean’s capacity to absorb atmospheric carbon dioxide, exacerbating climate change.
• Marine heatwaves are extreme weather events in the ocean, capable of causing rapid and severe impacts on marine biodiversity, including mass mortality of fish, invertebrates, and seaweeds.
• Coral bleaching occurs when corals expel the symbiotic algae (zooxanthellae) living in their tissues due to stress, primarily from elevated sea temperatures, leading to the coral turning white and often dying if conditions persist.
• Shifting fish populations refer to changes in the geographical distribution of marine species in response to altered ocean temperatures, oxygen levels, and food availability, impacting traditional fishing grounds and management strategies.
• Algal blooms, including harmful algal blooms (HABs), are rapid increases in the population of algae, some of which produce potent toxins that can accumulate in the food web, affecting marine life and human health.
• Unpredictable ocean conditions, such as changes in ocean currents, upwelling events, and stratification, disrupt marine food webs and ecosystem productivity, posing challenges for fisheries management and conservation efforts.
• Integrated monitoring approaches involve combining diverse data sources, including satellite remote sensing, in-situ oceanographic observations, climate models, and artificial intelligence, to provide a comprehensive understanding of marine ecosystem changes and facilitate timely advisories.

Key Features

Feature	Significance
Warming Seas	Leads to thermal expansion of water and altered ocean currents, impacting marine species distribution and ocean productivity.
Marine Heatwaves	Periods of unusually warm ocean temperatures, causing stress on marine organisms and ecosystems, particularly coral reefs.
Coral Bleaching	Expulsion of symbiotic algae by corals due to stress, leading to loss of colour and increased mortality, severely damaging reef ecosystems.
Shifting Fish Populations	Changes in the geographical distribution of marine species in response to altered ocean temperatures, affecting traditional fishing grounds and livelihoods.
Algal Blooms	Rapid increase in the population of algae, often harmful, depleting oxygen and producing toxins, thereby impacting marine life and human health.
Unpredictable Ocean Conditions	Increased variability and extreme events in ocean parameters, making resource management and disaster preparedness more challenging.

Why it Matters

Environmental Significance

• Preservation of marine biodiversity and ecosystem services, including oxygen production, carbon sequestration, and nutrient cycling.
• Maintenance of the health and resilience of critical marine habitats such as coral reefs, mangroves, and seagrass beds, which act as natural buffers against coastal erosion.

Economic Significance

• Sustenance of fisheries and aquaculture sectors, which provide food security, employment, and economic stability for coastal communities.
• Protection of coastal livelihoods dependent on marine resources, including tourism, shipping, and traditional fishing practices.

Social Significance

• Safeguarding the cultural heritage and traditional knowledge associated with marine environments and coastal living.
• Ensuring the well-being and food security of populations reliant on marine protein sources, particularly in developing coastal nations.

Technological Significance

• Advancement in remote sensing, oceanographic observations, climate modeling, and artificial intelligence for enhanced ocean monitoring and predictive capabilities.
• Development of integrated data platforms for comprehensive understanding of marine ecosystem changes and timely dissemination of advisories.

Challenges

1. Data Integration and Accessibility

• Difficulty in integrating diverse datasets from satellite remote sensing, in-situ observations, and climate models due to varying formats and scales.
• Ensuring timely access to comprehensive and high-resolution marine data for effective decision-making and early warning systems.

UPSC Link: Science and Technology-developments and their applications

2. Predictive Modeling Accuracy

• Challenges in developing accurate climate models that can reliably forecast localized marine heatwaves, algal blooms, and fish population shifts.
• Limitations in current models to fully account for complex interactions within marine ecosystems and feedback loops.

UPSC Link: Environmental pollution and degradation

3. Capacity Building and Awareness

• Need for enhanced scientific and technical capacity in developing countries for utilizing advanced ocean monitoring technologies and interpreting complex data.
• Raising awareness among coastal communities and policymakers about the severity of climate risks to marine ecosystems and the urgency of adaptive measures.

UPSC Link: Conservation, environmental pollution and degradation

4. Policy and Governance Gaps

• Absence of comprehensive and integrated policies that effectively address transboundary marine climate risks and promote sustainable fisheries management.
• Challenges in enforcing regulations and implementing adaptive strategies across diverse jurisdictions and stakeholder interests.

UPSC Link: Government policies and interventions

5. Financial Resource Mobilisation

• Securing adequate and sustained funding for advanced marine research, monitoring infrastructure, and climate adaptation projects.
• Investing in resilient coastal infrastructure and alternative livelihood options for communities impacted by marine climate change.

UPSC Link: Environmental impact assessment

Challenges — UPSC Perspective

Issue	Concern
Warming Seas	Threatens marine biodiversity and alters ocean chemistry, impacting calcifying organisms and overall ecosystem stability.
Marine Heatwaves	Causes mass mortality events, coral bleaching, and disruption of food webs, leading to significant ecological and economic losses.
Shifting Fish Populations	Disrupts traditional fishing patterns, leading to resource conflicts and economic instability for fishing communities.
Coral Bleaching	Degrades critical reef habitats, reducing their capacity to support marine life, protect coastlines, and attract tourism.
Algal Blooms	Poses risks to marine life through oxygen depletion and toxin production, and to human health through contaminated seafood.
Unpredictable Ocean Conditions	Increases vulnerability of coastal communities to extreme weather events and complicates long-term resource management.

Way Forward

• Foster international collaboration for integrated ocean monitoring and data sharing, leveraging satellite remote sensing, in-situ observations, and climate models.
• Invest in advanced research and development of artificial intelligence and machine learning algorithms for improved prediction and early warning systems for marine climate risks.
• Strengthen capacity building initiatives for marine scientists, fisheries managers, and coastal communities in utilizing and interpreting complex oceanographic data.
• Develop and implement adaptive management strategies for fisheries and aquaculture to cope with shifting fish populations and unpredictable ocean conditions.
• Promote ecosystem-based approaches to marine conservation and management, integrating climate change considerations into policy frameworks.
• Enhance public awareness and education campaigns on the impacts of climate change on marine ecosystems and the importance of sustainable practices.
• Mobilize financial resources for climate-resilient coastal infrastructure and support for alternative livelihoods in vulnerable coastal communities.

UPSC Value Addition

Prelims Practice Questions

Q1. Consider the following statements regarding the impacts of climate change on marine ecosystems:
1. Marine heatwaves can lead to coral bleaching.
2. Shifting fish populations are solely a result of overfishing and not climate change.
3. Algal blooms are often exacerbated by increased ocean temperatures.
How many of the above statements are correct?

1. Only one
2. Only two
3. Only three
4. None

Answer: Only two — Statement 1 is correct: Marine heatwaves are a primary driver of coral bleaching events. Statement 2 is incorrect: While overfishing is a factor, climate change, particularly ocean warming and acidification, significantly contributes to shifting fish populations. Statement 3 is correct: Warmer ocean temperatures can promote the growth and proliferation of certain harmful algal species, leading to more frequent and intense algal blooms.

Q2. Which of the following technologies are considered crucial for improving ocean monitoring and providing early warnings for marine ecosystem changes, as highlighted by experts?
1. Satellite remote sensing
2. Oceanographic observations
3. Climate models
4. Artificial intelligence

Select the correct answer using the code given below:

1. 1 and 2 only
2. 2, 3 and 4 only
3. 1, 3 and 4 only
4. 1, 2, 3 and 4

Answer: 1, 2, 3 and 4 — The news report explicitly mentions the growing need to integrate satellite remote sensing, oceanographic observations, climate models, artificial intelligence, and in-situ data for better understanding and timely advisories. Therefore, all four listed technologies are considered crucial.

Mains Practice Question

✍ Critically examine the multifaceted threats posed by climate change to marine ecosystems and coastal livelihoods in India. Discuss the role of advanced technologies in mitigating these challenges and enhancing resilience. (15 Marks)

Approach: INTRODUCTION: Briefly define marine ecosystems and acknowledge the increasing climate change impacts. BODY PART 1 (Threats): Detail the specific threats: ocean warming, marine heatwaves, coral bleaching, ocean acidification (if relevant, though not explicitly in news), shifting fish populations, increased frequency/intensity of extreme weather events affecting coastal infrastructure, and their direct impact on fisheries and coastal livelihoods. Provide examples relevant to India’s extensive coastline and island territories. BODY PART 2 (Technological Role): Discuss the role of advanced technologies: satellite remote sensing for broad-scale monitoring, oceanographic observations for in-situ data, climate models for projections, and Artificial Intelligence for data analysis, pattern recognition, and predictive capabilities. Emphasize their integration for early warning systems and informed decision-making. CONCLUSION: Summarize the urgency of integrated approaches and policy interventions for sustainable marine resource management and coastal community adaptation.

Source: The Hindu

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