es_100_Lecture_11

es_100_Lecture_11 - Lecture11 Predator Mediated Coexistence...

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Lecture 11 Predator Mediated Coexistence
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Review last lecture Predation, what is a predator ? What is a keystone predator ? Pisaster example Is a keystone defined by the circumstance or by the species? Make a case. Pisaster was not a keystone everywhere it lived. What controlled when it was a keystone?
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“Keystone predation” is subset of  category “predator-mediated  coexistence” Predator ‘mediates’ (facilitates) coexistence by reducing dominant competitor In order for this to work, must have a situation where the environment facilitates a dominant competitor
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Wave-exposed…mussels thrive and can grow and recruit fast enough to be dominant species Wave-protected shores…mussels are not able to thrive and so are not dominant Sandy conditions keep one species from dominating
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Does predator mediated co-existence  exist on land ?  Old idea……
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Darwin (1859) Origin of Species . “Struggle for Existence” “If turf which long has been mown… be let to grow, the more vigorous plants gradually kill the less vigorous, though fully grown plants.” Conducted experiment: compared mowed to unmowed plots of grass
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Darwin….first person to suggest that  herbivores could control plant  community richness Mechanism = reducing ability of a good competitor to take over
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