ZOOL352 Study Guide - Protozoa, Multimodal Distribution, Abiotic Component
12 Dec 2014
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Document Summary
Density-dependent and density- independent events: dependence on the size of the population. Number of parasites is determined by infection rate and immune response. Population tends to pick specific sites in a host. Number of parasites in one host determines the likelihood of finding the parasite in another host. Hypothesis about site selection (4): niche restriction pick same spot all the time, enhanced reproduction same spot during reproduction period, reduced inter-specific competition selection process, predation reduction for ectoparasites to avoid grooming. Ontogenetic migration parasites live in the upper part of intestine throughout their life. Daily migration parasites move from upper to lower intestine and back with the food. Interspecific interaction: if two parasites have same preferred site, one stays there and the other one moves. When number of parasites increases, it has negative effect of well-being of individuals (they grow smaller, weaker, low establishment rate and small lifespan)
