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BIOL202 - Lecture 5 - Revised Overhead

BIOL202 - Lecture 5 - Revised Overhead - competitor Mytilus...

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How abundance of the stronger competitor affects the potential for species coexistence: a classic example Robert Paine’s experimental work in the 1960s involving competition for space amongst sessile invertebrates in the intertidal zone Several species of sessile, filter-feeding invertebrates compete for space on rocks; if they don’t get a space, they die Mytilus , however, is dominant species; will overgrow and “choke out” all other species One species of starfish preys on all species, but has preference for Mytilus mussels Question: What effect does the starfish’s preference for the stronger
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Unformatted text preview: competitor, Mytilus mussels , have on the coexistence of the multiple species competing for the same critical resource, space ? Paine’s experimental design:-Set up 4 fenced-in exclosures-Removed starfish ( Pisaster ) from 2 exclosures; others = controls -Monitored diversity of sessile invertebrate species over 10 years Results: Take-home message: If two competing species have extensive niche overlap, the stronger species should gradually competitively exclude the weaker species. This assumes, however, that: In this study:...
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