Climate Change and Avian Vulnerability: A Review of Effects on Migration, Breeding, Physiology and Conservation

Abstract

Climate change has emerged as one of the most critical factor of biodiversity loss worldwide, profoundly influencing avian populations through changes in temperature, precipitation and extreme weather events. Birds, being highly sensitive to environmental changes, act as effective bioindicators of ecosystem change. This review evaluates the multifaceted impacts of climate change on birds, focusing on phenology, migration, breeding biology, survival, population dynamics, physiological stress and conservation strategies. Global warming has altered migration timing, disrupted breeding synchrony and increased reproductive failures, particularly among insectivorous and montane species. Rising temperatures and irregular rainfall patterns have reshaped food availability and nesting success while intensified heatwaves and disease outbreaks contribute to direct mortality. In India, regions like Gujarat and Sikkim exhibit clear evidence of climate-induced shifts in avian distribution, breeding failures and mass mortality during heat events. Conservation responses include vulnerability assessment, ecosystem restoration, creation of habitat corridors and public initiatives promoting sustainable lifestyles. Integrating scientific research with policy actions such as India’s Lifestyle for Environment (LiFE) Mission can mitigate climate impacts and strengthen avian resilience. The findings underscore the urgency of adaptive conservation planning, habitat restoration and public engagement to safeguard bird diversity in a rapidly changing climate.