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Lecture 7

Biology Lecture 7 Article 1.docx

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Scott Browning

BIOLOGY LECTURE #7 Resource Partitioning and Why it Matters 1. ANSWERS HOW similar species can coexist in the community by “staying out of the way of each other” + reducing interspecies competition by using resources differently * Interspecific competition: different species commonly compete for resources 2. ANSWERS HOW ongoing species declines will effect a community 3. High resource partitioning helps maintain species diversity and might also make functioning of eco highly sensitive to extinction 4. Various ways competing species have evolved specialized traits and partitioned resource exploitations = diversity 5. If new competitor, benefit of tapping into resources another competing species can’t use = new traits fast Similar Species Compete for Same Limiting Resources Complete Competitors Cannot Coexist  2 species can’t coexist on same limiting resource if they use it in the same way: superior competitor always wins  Specializing in use of resources limits competition with others, and stops the best competitor in similar species from out-competing Dividing the Resource Pie - Divide resources by using: different slices, same slices in different places, same slices at different times How Do Potential Competitors Partition Resources In Nature  Differences in morphological adaptions allow different resource use  Different species can be better adapted to specific forms of resource  Easy to find differences in how animals use resources, not animals Coexisting plants differ in forms of N that they prefer, rooting depth and light use optima Ex) Bees: compete for nectar and have different proboscises lengths that help them specialize in exploitation of plants with diff corolla lengths. Species with similar length probos occurs in different altitudes Same Slice Different Restaurant If resources used similarly in one way, they show differences in another way: Ex) Bumblebees occur in varying altitudes, and Pyke found that although some bees had similar long probos and could forage on similar plants, they were differentially specialized to altitude, so that sites at diff altitudes were dominated by diff pair of long + short probo species Ex) Tree dwelling lizards: could forage in same place or eat same size prey, but never did both of these  Pairs of classes that don’t belong in same species don’t show high overlap over the axes Resource Partitioning a Solution for Coexistence? - Interspecific competition less likely = competitive exclusion if
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