BIOLOGY 101 Lecture Notes - Lecture 28: Trophic Cascade, Carbon, Ecosystem Ecology
Document Summary
Ecosystem: all organisms and the abiotic factors with which they interact. Focuses on what orga(cid:374)is(cid:373)(cid:859)s do: required currencies: energy, matter. Photosynthesis: co2 + h2o glucose + o2 (+ heat, light energy chemical energy, autotroph (cid:862)self-feeding(cid:863) Respiration: glucose+ o2 co2 + h2o + atp, releasing chemical energy to do work, heterotroph (cid:858)feedi(cid:374)g o(cid:374) others(cid:859) Every energy conversion is inefficient (heat loss) Energy transfers among organisms reflect consumption: 10% rule from primary producers tertiary consumers. After plants, only 10% of energy (joules) transfer to next consumers. Biomass: total weight of particular organism: biomass of organisms in g/m^2: Movements and chemical transformations of key elements between biotic and abiotic components of an ecosystem. Carbon (c), nitrogen (n), phosphorus (p) are focus. These cycles include no losses, just transfers. Co2 goes into the primary producer (transfers to the) consumer, consumer releases co2: primary producer and consumer both decompose which releases co2.
