Ecology Unit Chapters 55-59 Notes PART 6

Biology

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7 Ansh Guglani B. Two views: 1. Individualistic concept: H.A. Gleason; a community is nothing more than an aggregation of species that happen to occur together at one place, respond independently, composition changes gradually 2. Holistic concept: F.E. Clements; a community is an integrated unit; Superorganism – more than the sum of its parts C. Interactions in community 1. Competition a. Two types: Intraspecific and Interspecific b. Affects Reproductive success c. Competing for resources: food, water, light or living space (including nesting sites or burrows.) d. Interference competition involves overt fighting or other face-to-face interactions vs. Exploitative competition with no direct interaction e. Ecological niche is an organism’s role in the ecosystem rather than just its habitat or location; describes its
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Unformatted text preview: utilization of resources f. Fundamental Niche versus Realized Niche- Entire niche based actual niche in on physiological presence or tolerance and needs absence of _____ (Barnacle study – Connell) species g. Principle of Competitive Exclusion (proposed by Russian G.F. Gause 1934) – States if two species are competing for the same limited resource, one will eventually eliminate the other locally; no two species can occupy exactly the same niche at the same time in the same place when resources are limiting. h. Resource partitioning enables two or more similar species to coexist in the same area by dividing up their resources; feeding zones-warblers and lizards (anoles) i. Character Displacement (1860’s) – species living sympatrically (same environment) tend to diverge in...
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This document was uploaded on 07/27/2011.

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