EnvironmentSource: Down To Earth
Arctic Marine Mammals Suffer Increased Mortality, Decreased Reproductive Rate Due to Oceanic Heat Waves: Study
Monday, 24 February 2025
Read Original ArticleKey Points
Arctic marine mammals are facing increased mortality and decreased reproductive rates due to rising ocean temperatures from marine heatwaves (MHWs). This issue is significant for UPSC aspirants, particularly for GS Paper 3, as it highlights urgent environmental challenges. Last Updated: 2025-02-24
Key Facts About Arctic Marine Mammals and Marine Heatwaves
- Increased mortality and reproductive decline in Arctic marine mammals.
- Species such as whales, seals, and walruses are particularly affected.
- Marine heatwaves lead to toxic algal blooms and spread of diseases.
- Prey migration impacts food availability for these mammals.
- Shifts in prey distribution increase human-wildlife conflict.
- MHWs are defined as ocean temperature rises of 3-4°C above average.
- Climate change is the primary driver of MHWs.
- Oceanic currents and atmospheric shifts exacerbate MHW occurrences.
Impact of Marine Heatwaves on Global Ecosystems
Marine heatwaves have a macro-level significance as they threaten global biodiversity and disrupt marine ecosystems. These heatwaves cause mass fish deaths, habitat destruction, and threaten coral reefs and kelp forests. The economic impact is profound, with coastal communities facing losses from disrupted fisheries. MHWs are projected to occur 50 times more by 2100, highlighting the urgent need for global climate action.
Related Government Schemes/Policies
- National Action Plan on Climate Change (NAPCC): Aims to address climate change and enhance ecological sustainability.
- Marine Protected Areas (MPAs): Designed to conserve marine biodiversity and protect vulnerable species.
UPSC Relevance
- GS Paper 1: Geography - Impact of climate change on biodiversity.
- GS Paper 3: Environment and Ecology - Climate change, conservation strategies.
- Prelims: Questions on definitions of MHWs, affected species, and climate change impacts.
- Mains: Analytical themes on environmental policies, climate change mitigation strategies.
- Essay Paper: Topics on climate change and its global impact.
FAQ Section
- What is a marine heatwave? A marine heatwave is a period when ocean temperatures rise by 3-4°C above the average, causing significant ecological disruptions.
- Why are Arctic marine mammals important? Arctic marine mammals play a crucial role in maintaining the ecological balance and are indicators of ocean health. Their decline signals broader environmental issues.
- What are the key features of marine heatwaves? Key features include increased ocean temperatures, toxic algal blooms, prey migration, and habitat destruction, all of which threaten marine biodiversity.
Detailed Coverage
- Increased mortality and reproductive decline in Arctic marine mammals.
- Whales, seals, and walruses are particularly affected.
- Marine heatwaves lead to toxic algal blooms and spread of diseases.
- Prey migration is impacting food availability.
- Shifts in prey distribution increase human-wildlife conflict.
- MHWs are defined as ocean temperature rises of 3-4°C above average.
- Climate change is the primary driver of MHWs.
- Oceanic currents and atmospheric shifts exacerbate MHW occurrences.
- MHWs cause mass fish deaths and habitat destruction.
- Higher temperatures threaten coral reefs and kelp forests.
- MHWs can intensify extreme weather events.
- Coastal communities face economic losses from disrupted fisheries.
- MHWs are projected to occur 50 times more by 2100.
- The Arctic is particularly vulnerable due to existing temperature extremes.
- Stricter policies and early warning systems are essential for mitigation.
- Expanding Marine Protected Areas is crucial for marine life protection.
D1