SIO 132 Lecture Notes - Lecture 15: Intertidal Zone, Keystone Species, Starfish

• School: UCSD
• Department: Scripps Institution of Oceanography
• Course: SIO 132
• Professor: Burton

Document Summary

Interaction & community ecology: competition, predation, keystone predation, parasites & predator-prey interactions, keystone parasitism. The larva have a separate possible fundamental niche. How do predators affect community structure: what interaction do you see evidence of here? (a picture of top layer of mussels, seastars in the middle, algae closest to water) (a) algae out-competing mussels. (b) Mussels out-(cid:272)o(cid:373)peti(cid:374)g algae (cid:894)(cid:272)(cid:895) predator(cid:455) seastars restri(cid:272)ti(cid:374)g algae"s upper li(cid:373)it (d) Predator(cid:455) seastars restri(cid:272)ti(cid:374)g (cid:373)ussels" lower li(cid:373)it: paine 1966 removal experiment. - the sea star are major predators in rocky intertidal zone, compete w/ both mussels and barnacles which all compete for space. He removed the sea stars and the mussel became more common (in % present in intertidal zone) and the barnacle decreased in %, mussels competitively exclude semibalanus. The mussels exclude barnacles and other "primary space holders. " Infected fish are 10-30 times more likely to be eaten.