BIOB50H3 Lecture Notes - Lecture 9: Santa Catarina Island, Climax Community, Omnivore
8 Sep 2017
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Document Summary
Key themes: interactions between species can affect their distribution and abundance, species act as agents of natural selection when they interact, the outcome of interactions among species is dynamic and conditional. Properties of communities: community interacting populations of different species found in same place/time, interrelationships govern ow of energy and nutrient cycling within community, competition, predator/prey, parasitism, mutualism, commensalism. Physical or biological characteristics e. g. biomes like desert, hot springs, temperate rainforest, coral reef because they are de ned by their dominant plants or physical features like their hot springs. Autotrophs (aka primary producers: form organic molecules through the reduction of inorganic carbon (nitrogen, phosphorous) obtained from physical environment, e. g. photoautotrophs, chemoautotrophs. Heterotrophs (aka consumers: obtain organic carbon and other elements needed for growth from other organisms. Can measure community structure in terms of how energy is transferred through it, ow of energy is from autotrophs to heterotrophs. !2: the set of characteristics that shape communities, two important descriptors of this.
