Authors: Sofia Quinodoz Michael A Thomas Jörn Dunkel EvaMaria Schötz
Publish Date: 2011/03/04
Volume: 142, Issue: 6, Pages: 1324-1336
Abstract
The tradeoff between traits in lifehistory strategies has been widely studied for sexual and parthenogenetic organisms but relatively little is known about the reproduction strategies of asexual animals Here we investigate clonal reproduction in the freshwater planarian Schmidtea mediterranea an important model organism for regeneration and stem cell research We find that these flatworms adopt a randomized reproduction strategy that comprises both asymmetric binary fission and fragmentation generation of multiple offspring during a reproduction cycle Fragmentation in planarians has primarily been regarded as an abnormal behavior in the past using a largescale experimental approach we now show that about one third of the reproduction events in S mediterranea are fragmentations implying that fragmentation is part of their normal reproductive behavior Our analysis further suggests that certain characteristic aspects of the reproduction statistics can be explained in terms of a maximum relative entropy principle
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