A multi-institutional team has conducted a stable nitrogen isotope analysis on the remains of high-altitude birds found at Paleolithic sites in the Bolan Pass, Pakistan. The study found a significant shift in isotopic ratios around 50,000 years ago, indicating a change in the avian food web that correlates with the arrival of early Homo sapiens in the region.
The data suggests that these early humans were not just opportunistic hunters but possessed specialized foraging strategies that impacted the local ecosystem's trophic levels. By analyzing the isotopic signatures of prey species, researchers have reconstructed a high-resolution map of the environmental shifts that occurred during the late Pleistocene, providing a detailed context for the initial human dispersal into South Asia.