Discovery of Blind Cave Loach in Meghalaya
Why focus: Subterranean species discovery — pure GS3 Biodiversity; fits the classic Match-the-Following format linking endemic species to geography.
In News
What Happened
Why It Matters
Background
History & Context
What Changed
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Prior understanding: Cave-dwelling fish discovered in the region were largely expected to be obligate cave species (troglobites) that have completely lost their eyesight and pigmentation due to evolutionary adaptation to darkness.
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Current understanding: Schistura densiclava is classified as a troglophile; it thrives in underground caves but remarkably retains functional eyes and a pale yellow-green pigmentation with black bars, showing an evolutionary adaptability to both subterranean and surface waters.
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Prior understanding: Nutrient-scarce subterranean cave waters with temperatures around 18 degrees Celsius and low oxygen levels were considered highly restrictive for maintaining diverse food webs.
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Current understanding: The new species demonstrates exceptional resilience, thriving in these harsh conditions by feeding on copepods, tiny shrimp, insect fragments, and bat guano, revealing a complex and interdependent cave ecosystem.
Prelims Angle
NCERT Connection
Practice Questions
Q1
With Reference ToWith reference to the newly discovered Schistura densiclava and its habitat, consider the following statements: 1. It is a completely blind and pigmentless obligate cave fish that can only survive in subterranean environments. 2. It was discovered in the karst cave systems of Meghalaya, which are formed by the dissolution of soluble rocks like limestone. Which of the statements given above is/are correct?