Life Strategies in Placozoa
Romanova, D.; Nikitin, M. A.; Shchenkov, S. V.; Moroz, L. L.
Show abstract
Placozoans are essential reference species for understanding the origins and evolution of the animal organization. However, little is known about their life strategies in natural habitats. Here, by establishing long-term culturing for four species of Trichoplax and Hoilungia, we extend our knowledge about feeding and reproductive adaptations relevant to their ecology and immune mechanisms. Three modes of population growth depended upon feeding sources, including induction of social behaviors and different reproductive strategies. In addition to fission, representatives of all haplotypes produced swarmers, which could be formed from the lower epithelium (with greater cell- type diversity) as a separate asexual reproduction stage. In aging culture, we reported the formation of specialized structures ( spheres) from the upper cell layer as a part of the innate immune defense response with the involvement of fiber cells. Finally, we showed that regeneration could be a part of the adaptive reproductive strategies in placozoans and a unique model for regenerative biology in general.
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