title: Factors affecting germination, growth, and distribution of the freshwater sponge, Spongilla fragilis Leidy (Porifera).
mesh_terms: D000818:Animals; D004777:Environment; D005618:Fresh Water; D006863:Hydrogen-Ion Concentration; D008027:Light; D011161:Porifera / Q000254:growth & development*; D013696:Temperature