Propagulum
Propagulum is a term used in theoretical ecology to designate a reproductive or dispersal unit that is self-contained and capable of initiating a new organism under suitable conditions. It is conceptually related to a propagule but is defined to emphasize autonomy, energy stores, and protective coatings that permit survival during transport and dormancy prior to germination.
Etymology: from Latin propago to propagate, with the diminutive suffix -ulum.
Definition and composition: A propagulum comprises genetic material sufficient to establish growth, a minimum reserve of
Formation and dispersal: Propagula may form through fragmentation, budding, or specialized developmental programs. They detach from
Distinctions and uses: The propagulum is distinguished from spores and seeds by its emphasis on autonomy and
See also: propagule, dispersal, colonization, life-history theory.