title: Nonlinear oscillations in marine hydroids.
abstract: Irregular oscillations in a colony of marine hydroids Podocoryne carnea were investigated. Quantitative characteristics were obtained as a result of long term (10-12 h) monitoring of oscillations at arbitrary sites. The sliding window spectra as well as the pulse-to-pulse dynamics argue the transient chaotic behavior of hydroid colony. The significant change of amplitudes and frequencies in intact colony oscillations after feeding and long sustained oscillations of stolons separated from colony suggest that the irregular activity could be determined by the network of pacemakers residing in stolon wall cells. These are influenced mechanically by the amount of digesting food and/or by chemical action of nutrients inside the stolon lumen. The possible correlation of these oscillations which can evoke Ca(2+) waves in stolon wall cells is discussed.
authors.affiliation: Biophysical Research Group, Vytautas Magnus University (VMU), Donelaicio 58, Kaunas 3000, Lithuania. mive@gmf.vdu.il
authors.forename: Mindaugas S
authors.initials: MS
authors.lastname: Venslauskas
authors.forename: Sarunas
authors.initials: S
authors.lastname: Asmantas
mesh_terms: D000818:Animals; D002450:Cell Communication / Q000502:physiology*; D002454:Cell Differentiation; D002465:Cell Movement / Q000502:physiology*; D004063:Digestion / Q000502:physiology; D004068:Digestive System Physiological Phenomena; D005247:Feeding Behavior / Q000502:physiology*; D037402:Hydrozoa / Q000166:cytology / Q000502:physiology*; D018715:Microscopy, Video / Q000379:methods; D008954:Models, Biological; D017711:Nonlinear Dynamics; D009991:Oscillometry / Q000379:methods*; D010507:Periodicity; D012623:Seawater; D012815:Signal Processing, Computer-Assisted