GE CLST M1A Lecture Notes - Lecture 8: Prey Switching, Chemosynthesis, Photosynthesis

• School: UCLA
• Department: General Education Clusters
• Course: GE CLST M1A
• Professor: D' Auria

Document Summary

Human existence only possible because other organisms provide resources. Must harvest living organisms to secure these uses: Best harvesting policy for a species depends on. How it fits into community trophic structure. Vach trophic le(cid:290)el can"t produce enrgy more than it consumes. 93% of energy taken up used in respiration. 68% of energy taken up used in respiration. 15% of gross production used in respiration. Chemosynthesis: 6co2 + 6h2o + 3h2s c6h12o6 + 3h2so4. Long-term study of sea otter populations along aleutians and western. (cid:553)99(cid:552)"s: some populations of sea otters declining. Sea otter population had declined by 90% 1970: ~53,000 sea otters in survey area. 1991: orca (killer whales) observed eating a sea otter. Sea lions and seals are normal prey for orca. Reduction in population of normal prey species led to prey s(cid:291)itching" in orca. 1 adult male must ingest ~287,330 kcal/day.