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ecology sci. papers
information about various ecology scientific papers
| questions | answers | |
|---|---|---|
| mixed definition of community | true most interactions between species is random, but some of these attributes are a result of interactions enforced coevolution | |
| closed vs. open graphs | closed graphs show a holistic view, indicate that species are connected and come and go together, things kind of go in intervals, they start and end around the same time | open graph, reflects individualistic view, species just come and go as they please, things don't necessarily start and stop at the same intervals, a continuum concept |
| gradient analysis | continuum concept with plant distributions at different altitudes/latitudes | problems w graident analysis: measures by density which is inaccurate bc trees disperse differently. also doesn't account for other factors that could affect plant growth (ie nitrogen, o2) |
| indicies of diversity | used to fix errors of species richness. in an environment, few species are frequently found, most species are infrequently found | generally communities w higher diversity are buffered from extinction |
| difference between random and haphazard | random: everything has an equal chance of being selected | haphazard: just picking, could be bias |
| How can you describe a community | compound and component communities, species richness and diversity, species abundance curves, food webs and chains, guilds | |
| compound vs. component communities | compound communities include all organisms in a given landscape | component communities, a subset of compound communities, subsets of organisms in compound communities ie. if the compound community is a forest, the component community could be a fallen tree |
| species richness and species diversity | number of species per area | species diversity: number of species and how individuals are approportioned in those species |
| What is a community? | collection of species in an area | |
| two extreme views of a community | Clements: communities are a superorganisms, various species are body parts, they're all connected, considered a holistic concept: we can only understand each species in terms of contribution to the entire system | Gleason: community is a lucky combination of species and things,considered the individualistic concept: community structure just expresses how individuals interact in a system, no higher organization, focus on species tolerance to enviro, not interactions |
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hsinha93
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