Colonization of Implanted Substrates by Differently Sized Gammarus pulex (Amphipoda)

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Abstract
Colonization of implanted substrates by G. pulex (L.) was studied during a 32 day period in a south Swedish stream. Size class diversity and evenness indices increased throughout the period. Colonization rate decreased for small animals and increased for large ones during the colonization process while the rate for the size classes combined was linear. The number of animals colonizing an implanted substrate was determined by the momentary carrying capacity of the substrate rather than by the number of animals in the drift, provided the number of drifters was above a certain value.