BIOL 119 Chapter 56: Chapter 56: Ecosystems and Global Ecology
Document Summary
Ecosystem = species present in a region, along with abiotic components (like soil, water, climate, etc. ) Nutrients = things needed to sustain life (ex. carbon, nitrogen, etc. ) Biosphere = thin zone of life surrounding the earth. Everything in the world is connected, and the impact of human actions has consequences on the entire world. Primary producers use the transformed energy for growth and reproduction or for cellular respiration. Gross primary productivity (gpp) = total amount of chemical energy produced in a given area and time period. Net primary productivity (npp) = energy that is interested by primary producers for new tissue or offspring: represents total amount of chemical pe that is stored in biomass (=organic material). Npp = gpp - r (r = cellular respiration) Ef ciency of autotrophs: only use about ~0. 8% of incoming sunlight. Pigments for photosynthesis have a limit to how much light it can absorb.
