A combination of chemosensory and mechanosensory stimuli triggers the malemating response in the giant rotifer Asplanchna sieboldi

Citation
Kd. Joanidopoulos et W. Marwan, A combination of chemosensory and mechanosensory stimuli triggers the malemating response in the giant rotifer Asplanchna sieboldi, ETHOLOGY, 105(6), 1999, pp. 465-475
Citations number
15
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Animal Sciences","Neurosciences & Behavoir
Journal title
ETHOLOGY
ISSN journal
0179-1613 → ACNP
Volume
105
Issue
6
Year of publication
1999
Pages
465 - 475
Database
ISI
SICI code
0179-1613(199906)105:6<465:ACOCAM>2.0.ZU;2-S
Abstract
The rotifer Asplanchna sieboldi performs several well-defined behavioural r esponses to external stimuli. Contact of male and female occasionally elici ts a mating response in the male. The mating response is composed of a seri es of distinct behavioural elements. After the initial contact, the male st retches out its body wall outgrowths, arcs into a characteristic mating pos ture and glides along the surface of the female until the penis becomes att ached to the female's body wall, through which the spermatozoa are injected . Under experimental conditions, the mating response could be evoked by sti mulation with agar spheres that were impregnated with extracts prepared fro m females, while agar spheres prepared from buffer only did not cause any m ating response. If the active substance was added directly to the suspendin g medium in the observation chamber, mating could be triggered just by mech anical stimulation. It is concluded that the mating response is triggered b y a combination of chemical and mechanical stimuli. During the time course of the experiment there was no adaptation to the chemical stimulus. The rec eptor cells involved in the perception of the two stimuli remain tio be ide ntified. The mating response suppressed other behavioural responses that ar e usually triggered by tactile stimulation of the apical mechanosensors, su ggesting that signal processing by the nervous system occurs.