Conclusion
Our conclusion may be that a symbiosis may come into existence because the absence of antibiotic influences makes it possible and the presence of one or more symbiotic influences makes it necessary. Once a symbiosis has been formed a genotypical adaptation by means of natural selection of spontaneous mutants occurs. Because of this adaptation the association becomes obligatory and an ideal mutualism is reached in which only so many antibiotic influences are active as is necessary to benefit the association as a whole.
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The main part of this article consists of a lecture delivered at a symposium on adaptation during the XXXIth “Nederlands Natuur- en Geneeskundig Congres” in Groningen April 20, 1949. After a request of one of the editors to publish this lecture in Antonie van Leeuwenhoek, the lecture has been somewhat changed and extended to make it more suitable for publication in this journal.
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Quispel, A. Some theoretical aspects of symbiosis. Antonie van Leeuwenhoek 17, 69–80 (1951). https://doi.org/10.1007/BF02062248
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DOI: https://doi.org/10.1007/BF02062248