Meghalaya’s mystery frog: Scientists unravel the unique survival strategy of Kurixalus naso

Correspondent

Shillong: Deep in the rain-soaked hills of Meghalaya, a tiny high-altitude frog has revealed an extraordinary survival strategy that challenges conventional amphibian reproduction. Unlike most frogs that lay their eggs in water, Kurixalus naso, found in Mawsynram, buries its eggs in soil and waits for the monsoon rains to trigger hatching. A study published in Current Science has brought this unique adaptation to light, highlighting how the species has evolved to synchronize its breeding cycle with Meghalaya’s unpredictable monsoon patterns. The research, conducted by experts from St. Edmund’s College Shillong, NEHU, and Utkal University, provides new insights into the complex reproductive behaviour of this elusive species.

“The way these frogs hide their eggs is incredibly unique,” said lead researcher P.W. Shangpliang of St. Edmund’s College Shillong. “By blending them with the soil, they may be mimicking seeds, making them harder for predators to detect.” As the pre-monsoon showers begin in February, K. naso emerges from rock crevices, with males digging small burrows in the moist forest soil where they call for mates. After a prolonged mating embrace, females lay eggs deep within these burrows and disappear, leaving the males to tend to the clutch. The eggs, mixed with soil, remain concealed for up to 15 days, protected from predators and environmental fluctuations. Unlike most amphibians, whose eggs hatch within days, K. naso eggs remain dormant until heavy rains flood the burrows, a strategy that ensures the tadpoles emerge only when conditions are ideal.

However, the mystery deepens as these tadpoles are already at an advanced developmental stage upon hatching. Unlike typical frog larvae, which rely on gills for underwater respiration, K. naso tadpoles have absorbed their gills before ever touching water. “The delayed hatching of Kurixalus naso tadpoles at Gosner stage 25, when the gills have already disappeared, raises intriguing questions about the role of these gills,” Shangpliang remarked. “Typically, gills are essential for respiration in aquatic environments during early development, yet their function remains unclear when the tadpoles hatch after the gills have been absorbed. This unusual timing of hatching prompts researchers to explore the possible roles of gills while still encased in the egg jelly. Such discoveries could shed light on unique physiological adaptations of the species and open new avenues for understanding the evolutionary strategies of amphibians in the state of Meghalaya.”

Also Read: Meghalaya: State-Level Earthquake Mock Exercise Held in Shillong

Also Watch: