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Qualität und intraspezifische Konkurrenz im Regulationsprozeß von Insektenpopulationen
Author(s) -
Franz J. M.
Publication year - 1964
Publication title -
zeitschrift für angewandte entomologie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.795
H-Index - 60
eISSN - 1439-0418
pISSN - 0044-2240
DOI - 10.1111/j.1439-0418.1964.tb02989.x
Subject(s) - intraspecific competition , competition (biology) , population , biology , ecology , demography , sociology
Summary First, examples of physiological polymorphisms of insects are reviewed that are related to survival of individuals and populations in nature. Then it is shown that the environmental capacity (sensu M ilne ) for such populations may change as a consequence of changes in quality (vigour). On the other hand, intraspecific competition is widely acknowledged as the most perfect mechanism for density dependent population regulation. Since the intensity of intraspecific competition depends on the environmental capacity, any alteration of the quality of a population may also alter intraspecific competition. This is possible without alteration of environmental conditions or numbers of individuals per square unit because the relevant unit is the subjective “Umwelt” of each individual. The understanding of density dependent processes, therefore, requires the study of both, numbers and qualities in populations.