10 6 Lecture Summary Species and their relationships Selection in 2 allele systems cont Selection favoring heterozygotes can only occur is there is co dominance The environment determines what is fit Natural selection in polygene traits Directional stabilization Disruptive stabilization Stabilizing stabilization 1 Neutralism Two species don t have relations with each other 2 Commensalism one species gets benefit other doesn t care whale barnicles 3 Amensalism one species is hurt one has no benefit 4 Mutualism both organisms benefit Resourse resourse relationship resources are exchanged Service resource relationship services exchanged for resources Service service relationship services are exchanged Facultative vs Obligate Mutualism Facultative partners aren t necessarily dependent on each other Obligate partners are dependent on each other Interspecific Competition between species Intraspecific Competition between different species Interspecific Scramble Competition same resource at diff time Contest competition same resource same time Competitive exclusion principle One species will be selective and other will die Co existence due to a shared habitat Shifting advantages due to variables heat humidity etc Populations are maintained below competitive level Keystone Species a species that plays a critical role in maintaining the structure of an ecological community and whose impact in the community is greatest than would be expected based on its relative abundance or total biomass Resource partitioning 1 Habitat 2 Temporal day and night 3 Seasonal 4 Feed type or foraging strategy
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