title: Hypothesized kinetic models for describing the growth of globular and encrusting demosponges.
abstract: The marine sponges Dysidea avara and Chondrosia reniformis (globular forms) were cultured in the laboratory on a diet of viable Phaeodactylum tricornutum cells and dissolved nutrients (algae and fish powders). Our growth data were combined with literature data for Pseudosuberites andrewsi (a globular sponge) and for the encrusting sponges Oscarella lobularis, Hemimycale columella, and Crambe crambe. The suitability of three growth models-linear, exponential, and radial accretive-for describing the growth of globular and encrusting sponges was assessed. Radial accretive growth was determined to be the best model to describe growth of both encrusting and globular sponges. Average growth rates of 0.051+/-0.016 and 0.019+/-0.003 mm/day (calculated as the increase of the radius of the sponge per day) were obtained experimentally for D. avara and C. reniformis, respectively.
authors.affiliation: Food and Bioprocess Engineering Group, Wageningen University, P.O. Box 8129, 6700 EV, Wageningen, The Netherlands. detmer.sipkema@wur.nl
authors.forename: Detmer
authors.initials: D
authors.lastname: Sipkema
authors.forename: Nejla A M
authors.initials: NA
authors.lastname: Yosef
authors.forename: Marcin
authors.initials: M
authors.lastname: Adamczewski
authors.forename: Ronald
authors.initials: R
authors.lastname: Osinga
authors.forename: Dominick
authors.initials: D
authors.lastname: Mendola
authors.forename: Johannes
authors.initials: J
authors.lastname: Tramper
authors.forename: René H
authors.initials: RH
authors.lastname: Wijffels
mesh_terms: D000704:Analysis of Variance; D000818:Animals; D019149:Bioreactors; D001835:Body Weight; D047088:Dysidea / Q000254:growth & development; D007700:Kinetics; D008954:Models, Biological; D011161:Porifera / Q000254:growth & development*; D013997:Time Factors