Biology 2483A Lecture Notes - Lecture 11: Allelopathy

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mauveelephant391

9 Feb 2015

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Each plot has three treatment types: neighbours left intact (belowground and aboveground competition, neighbour roots left in tract but neighbor shoots tied back (belowground competition) plots, neighbor roots and shoots both removed (no competition) How important is competition: connell found that competition was important or 50% of 215 species in 72 studies, gurevitch et al. analyzed the magnitude of competition in 93 species in 46 studies (cid:224) competition had significant effects on a wide range of organisms, potential biases: researchers may not publish studies that show no significant effects, and a tendency for investigators to study species they suspect will show competition. Allelopathy: plants of one species release toxins that harm other species: for a resource in short supply, competition will reduce the amount available to each species, the effects of competition are or asymmetrical, and one species more than the other.

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