ES_100_Lecture_9

ES_100_Lecture_9 - Announcements: Section this week will be...

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Unformatted text preview: Announcements: Section this week will be outside except today.Todays groupsmeet under Ucen overhang on post office end. Look for nicole with green umbrella. Meet on lagoon side of UCEN on lower part of lawn. FIRST MIDTERM next Monday. No bluebook needed. NO MAKE UPS. Lectures 8-10: Niches, competition, coexistence Interspecific competition Predation, herbivory Physical disturbance Controls over species diversity Parasitism Productivity, resource heterogeneity Competitive exclusion principle (central to niche theory) How important is competition (evolutionarily and as ecological force)? Interspecific competition Predation, herbivory Physical disturbance Controls over species diversity Parasitism Productivity, resource heterogeneity Is it an important evolutionary force ? When is it an important ecological force ? We have discussed so far. Niches = multi-dimensional Rare for species to completely overlap in all aspects of resource use Coexistence can occur due to niche differences between species Resource heterogeneity promotes coexistence (e.g. barnacle example) Mechanistically.how does resource heterogeneity promote coexistence ? Differential fitness in different portions of landscape=essential . Some places on landscape where species A will do a little better than B Other places on landscape where species B will do better than A 11 SPECIES of co-occurring trees in genus Macaranga in Borneo rain forest Townsend, figure 6.16 Each species appears to be more abundant in a different part of the light environment How do you know that these differences are what is allowing for co-existence ? Patterns can be suggestive of avoidance of competition via partitioning of the resources, but do we know how the patterns came about ?...
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ES_100_Lecture_9 - Announcements: Section this week will be...

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