title: [Some regularities in the development of encrusting colonies of Cribrilina annulata (Fabricius, 1780)].
abstract: The growth of encrusting colonies was studied with mathematical model. It was shown that encrusting growth takes place under increasing competition for the substrate inside the colony. The model was tested on the example of Cribrilina annulata collected in White Sea on Laminaria saccarina. All colonies were mapped, zooids were measured and genealogical connections between them were established. A number of gradients were revealed by statistical methods. The intensity of budding decreases in astogeny according to theoretical predictions. It was shown that development of Cribrilina annulata colonies is strictly determined by gradients that can be caused by shortage of substrate space. It leads to the suppression of budding and changing in zooid size. Increasing substrate shortage is predictable and caused by the regularities in of zooid budding. The growth of colony stops after exhausting of potentially available substrate.
authors.affiliation: Dep. Invertebrate Zoology, Biology and Soil Faculty, St.-Petersburg State University, Universitetskaya nab. 7/9, St.-Petersburg 199034, Russia.
authors.forename: E B
authors.initials: EB
authors.lastname: Iagunova
mesh_terms: D000818:Animals; D002013:Bryozoa / Q000254:growth & development / Q000502:physiology*; D006790:Host-Parasite Interactions; D007795:Laminaria / Q000469:parasitology*; D008386:Marine Biology; D008954:Models, Biological; D012426:Russia