Climate Change & Loggerhead Turtles
A recent long-term study highlights how climate change is reshaping the biology and behaviour of loggerhead turtles. For UPSC aspirants, this topic links directly to Environment & Ecology, Biodiversity, Climate Change, and Conservation Policy.
๐ฌ Key Findings of the Study
Observed Climate-Linked Changes
1️⃣ Earlier Nesting
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Turtles are nesting earlier due to warmer ocean temperatures
2️⃣ Reduced Reproductive Output
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Fewer eggs
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Less frequent breeding
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Breeding cycle shifted from ~2 years → ~4 years
3️⃣ Declining Ocean Productivity
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Satellite chlorophyll estimates show reduced food availability
4️⃣ Shrinking Body Size
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Females becoming smaller
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Smaller females → smaller clutch sizes
๐ Why Is This Happening?
Warming Oceans
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Alters marine ecosystems
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Reduces prey abundance
Lower Chlorophyll Levels
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Indicates declining phytoplankton productivity
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Impacts entire marine food chain
๐ง Important Ecological Concept: “Capital Breeders”
Loggerhead turtles are capital breeders, meaning:
⚠ Scientific Concern
While earlier nesting may seem adaptive, researchers warn:
๐ก Conservation Implications
Traditional Focus
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Protect nesting beaches
Emerging Need
๐ Broader Climate Threats to Sea Turtles
1️⃣ Sea Level Rise
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Beach erosion
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Nest inundation
2️⃣ Sand Temperature Rise
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Affects temperature-dependent sex determination (TSD)
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Skewed sex ratios (often more females)
3️⃣ Ocean Ecosystem Changes
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Prey shifts
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Migration disruption
๐งญ Why This Matters for UPSC
๐ Prelims – Environment & Ecology
Key areas:
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Loggerhead turtle species
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Capital breeders
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Chlorophyll as productivity indicator
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Climate impacts on marine fauna
๐ Mains – GS III
Possible themes:
๐ Essay Topics
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“Climate Change and Silent Ecological Crises”
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“Adaptation vs Survival in the Anthropocene”
๐ Possible UPSC Questions
Prelims MCQ
Q. The term ‘capital breeders’, sometimes seen in ecology, refers to species that:
✅ Answer: B
Mains GS III
"Discuss the impact of climate change on marine biodiversity with reference to sea turtles."