The Western Ghats are a recognized biodiversity hotspot. Which of the following is currently considered the most significant threat to its endemic species, beyond general habitat loss?
Introduction of invasive alien species.
The question explicitly asks about the most significant threat beyond general habitat loss, so options A and D — which are direct drivers of habitat loss and habitat fragmentation — are excluded. Climate-driven forest fires (option C) are not yet the dominant disturbance in the Western Ghats relative to the other listed factors.
The remaining option, the introduction of invasive alien species, is widely identified by ecologists as a particularly serious threat to endemic species. Endemic plants and animals of the Western Ghats — adapted over millions of years to specific micro-habitats — are especially vulnerable to displacement and competition from naturalised exotics (e.g. Lantana camara, eucalyptus, wattle in shola grasslands, and several invasive freshwater fish in Western Ghats streams). Hence option B is the marked answer.
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