Chapter 56: Conservation Biology and Global Change

Conservation Biology and Global Change threats operate within a framework of anthropogenic climate change, driven by greenhouse gas emissions that alter temperature patterns, trigger sea level rise, increase ocean acidification, and shift the geographic ranges where species can survive. The chapter emphasizes quantitative approaches to assessing extinction risk, including population viability analysis to model long-term population persistence, determination of minimum viable population sizes needed to avoid inbreeding and random fluctuations, and metapopulation dynamics that describe how connected subpopulations can enhance overall species survival. Conservation strategies presented in the chapter integrate multiple scales and approaches. Protected areas serve as refugia for biodiversity, wildlife corridors facilitate movement and gene flow between fragmented habitats, and habitat restoration efforts attempt to rebuild degraded ecosystems. The chapter stresses that effective conservation requires sustainable resource management practices that balance human needs with ecosystem protection, ecosystem-based management approaches that maintain the ecological functions providing services like water purification and climate regulation, and careful attention to maintaining genetic diversity within populations. Finally, the chapter examines global responses to environmental change through international policy frameworks, mitigation strategies that reduce greenhouse gas emissions and slow climate change, and adaptation strategies that help species and human communities adjust to unavoidable environmental shifts. Throughout, the chapter demonstrates that conservation success depends on integrating principles from population genetics, landscape ecology, evolutionary biology, and social science to address the accelerating pace of human-driven environmental change.