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  • Title: [2 rules on the life cycle of trematodes in the ecosystem].
    Author: Bozkov D.
    Journal: Angew Parasitol; 1980 May; 21(2):91-4. PubMed ID: 7436039.
    Abstract:
    Rule I: The more advanced in its primary evolution a life cycle is, the greater the participation of the animal component in it is. Parallel to that, most often the direct effect of the non-living component of the ecosystem on the cycle running is decreased. Rule II: In the majority of secondarily evolved life cycles of trematodes the following occurred in comparison with their initial life cycle: a) either a decrease of the direct effect of the non-living component of the ecosystem on the cycle running; b) or a decrease of the participation of the animal component of the ecosystem in the cycle; c) or most often a decrease of both together.
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