How might climate change alter species distributions and ecosystem processes?

How might climate change alter species distributions and ecosystem processes?

• A. Climate change does not affect species distributions.
• B. Climate change only affects weather, not ecosystems.
• C. Species distributions are unaffected by climate.
• D. Shifts in temperature and precipitation change habitats, phenology, and interactions, potentially reducing biodiversity and altering energy cycles.

Answer: (D)

Climate change reshapes where species can live and how ecosystems work by changing the temperature and rainfall patterns they depend on. As conditions warm or precipitation patterns shift, the habitats that species need move, so many species migrate to cooler areas or higher elevations, while others lose suitable conditions. These shifts alter which species interact with each other, affecting competition, predation, and mutualisms, and can cascade through the food web. At the same time, the timing of biological events—such as when plants leaf out or flowers bloom, or when animals migrate—can change (phenology), leading to mismatches with the organisms they rely on for food or pollination. These changes in habitats, timing, and interactions influence energy transfer and nutrient cycling in ecosystems, and can reduce biodiversity if species can’t adapt or track their preferred conditions. In short, altering temperature and precipitation reshapes habitats, timing, and interactions, with broad consequences for ecosystem processes.