| Author | Pimentel-Souza, Fernando | pt_BR |
| Author | Schall, Virgínia Torres | pt_BR |
| Author | Lautner Júnior, Rodolfo | pt_BR |
| Author | Barbosa, Norma Dulce Campos | pt_BR |
| Author | Schettino, Mauro | pt_BR |
| Author | Fernandes, Nádia | pt_BR |
| Access date | 2020-01-13T14:46:53Z | |
| Available date | 2020-01-13T14:46:53Z | |
| Document date | 1984 | |
| Citation | PIMENTEL-SOUZA, Fernando et al. Behaviour of Biomphalaria glabrata (gastropoda: pulmonata) under different lighting conditions. Canadian Journal of Zoology, Ottawa, v. 62, n. 11, p. 2328-2334, Nov. 1984. | pt_BR |
| ISSN | 0008-4301 | pt_BR |
| URI | https://www.arca.fiocruz.br/handle/icict/39154 | |
| Language | eng | pt_BR |
| Publisher | NRC Research Press | pt_BR |
| Rights | restricted access | pt_BR |
| Title | Behaviour of Biomphalaria glabrata (gastropoda: pulmonata) under different lighting conditions | en_US |
| Type | Article | |
| DOI | 10.1139/z84-340 | pt_BR |
| Abstract | The preferred position, the surface contact area of the head–foot, and the locomotor activity of Biomphalaria glabrata were studied in a laboratory aquarium throughout the year. The snails were more frequently found on the walls and on the bottom than on the surface. Under two regimes of illumination their frequency of occurrences were different. The extent of the head–foot outside the shell increased from spring or summer to winter, and was significantly correlated negatively with temperature rather than illumination. Movement increased from summer to winter. Under artificial vertical lighting in the natural day cycle in group conditions two daily peaks become evident, at dusk and sunrise. Abrupt changes of illumination, especially during dusk, were discriminative cues for exogenous control of locomotion. Under constant darkness and in constant light, the level of locomotion was significantly lower than that under a natural day cycle of illumination, but in both regimes, locomotion was not significantly different; therefore, absolute illumination did not change the level of locomotion. In both regimes, snails were no longer synchronized to the solar rhythm. The threshold for natural light perception was around 20 lx, when photokinesis appeared during the winter. Photokinesis increased with locomotion and both activities varied inversely with temperature. | en |
| Affilliation | Universidade Federal de Minas Gerais. Instituto de Ciências Biológicas. Belo Horizonte, MG, Brasil. | pt_BR |
| Affilliation | Universidade Federal de Minas Gerais. Instituto de Ciências Biológicas. Belo Horizonte, MG, Brasil / Fundação Oswaldo Cruz. Instituto René Rachou. Belo Horizonte, MG, Brasil. | pt_BR |
| Affilliation | Universidade Federal de Minas Gerais. Instituto de Ciências Biológicas. Belo Horizonte, MG, Brasil. | pt_BR |
| Affilliation | Universidade Federal de Minas Gerais. Instituto de Ciências Biológicas. Belo Horizonte, MG, Brasil. | pt_BR |
| Affilliation | Universidade Federal de Minas Gerais. Instituto de Ciências Biológicas. Belo Horizonte, MG, Brasil. | pt_BR |
| Affilliation | Universidade Federal de Minas Gerais. Instituto de Ciências Biológicas. Belo Horizonte, MG, Brasil. | pt_BR |
| xmlui.metadata.dc.description.abstractfr | La position préférée, la surface de contact du céphalopodium et l'activité locomotrice de Biomphalaria glabrata os fait I'objet d'une étude durant toute une année dans un aquarium de laboratoire. Les gastropodes se tiennent surtout sur les parois latérales et le fond plutôt que'en surface. Cependant, les résultats ont été différents à deux régimes de luminosité différents. L'extension du pied à I'extérieur de la coquille augmente entre le printernps, ou l'été, et l'hiver et est en corrélation négative significative avec la température plutôt qu'avec l'intensité lumineuse. Les mouvements augmentent entre l'été et l'hiver. Lorsque les animaux sont en groupe, sous une source de luminère artificielle qui suit la photopériode naturelle et dirigée vers le bas, la courbe du mouvement est bimodale et l'activité locomotrice est importante surtout au crépuscule et à l'aube. Un changement brusque de luminosité, surtout aucrépuscule, est le facteur discriminant du contrôle exogène de la locomotion. Dans des conditions d'obscurité constante ou de lumière constante, l'activité locomotrice est significativement moins intense que lorsque la lumière suit la photopériode naturelle; cepedant, lorsque les conditions sont constantes, que ce soit à la lumière ou à l'obscurtié, l'intensité de l'activité locomotrice. Sous les deux régimes, les gastropodes cessent de suivre le rythme solaire. Le seuil de perception de la lumière naturelle est d'environ 20 lx lorsque la photocinèse se manifeste durant l'hiver. La photocinèse augmente avec l'activité locomotrice et ces deux activités sont fonction inverse de la température. | fr |
| Subject | Biomphalaria glabrata | en |
| Subject | Gastropoda pulmonata | en |
| Subject | Different lighting conditions | en |
| e-ISSN | 1480-3283 | pt_BR |
