Climate Change and Its Impact on Biodiversity and Ecosystem Services

Abstract

Climate change has emerged as one of the most significant global environmental challenges affecting biodiversity, ecosystem functioning and human well-being. Increasing atmospheric greenhouse-gas concentrations are altering temperature regimes, precipitation patterns, hydrological cycles, ocean conditions and the frequency and intensity of extreme events. These changes influence organisms at individual, population, community and ecosystem levels and can result in changes in species distributions, phenology, reproductive success, community composition, productivity and extinction risk. Biodiversity loss is particularly important because ecosystems depend on interactions among species to maintain processes such as pollination, nutrient cycling, soil formation, carbon sequestration, water purification, pest regulation and climate regulation. The Intergovernmental Panel on Climate Change (IPCC) has documented observed and projected climate-related impacts across terrestrial, freshwater and marine ecosystems, while the Intergovernmental Science-Policy Platform on Biodiversity and Ecosystem Services (IPBES) has emphasized the importance of biodiversity for nature's contributions to people. The present paper reviews the major pathways through which climate change affects biodiversity and examines the resulting consequences for ecosystem services. Published scientific literature and major international assessments were synthesized to identify major ecological responses, vulnerable ecosystems and ecosystem services at risk. The synthesis indicates that climate change can drive geographic range shifts, seasonal mismatches, habitat degradation, coral bleaching, species mortality and changes in community structure. Biodiversity loss can subsequently reduce ecosystem resilience and the reliability of ecosystem services. Conservation of climate refugia, restoration of degraded ecosystems, ecological connectivity, sustainable resource management, reduction of greenhouse-gas emissions and ecosystem-based adaptation are therefore essential components of climate-resilient biodiversity management.