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Some aspects ofPhytoseiulus persimilis [Acarina: Phytoseiidae] dispersal behaviour

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Abstract

Some of the processes that control or influence the movements of females of the predatory mitePhytoseiulus persimilis Athias-Henriot when dispersing between plants are studied here. Experiments on the preference for light or shadow, carried out in a choice chamber, showed that individuals that have been starved for longer or in environments with lower relative humidities have a stronger preference for shaded places. Whilst the speed of movement is independent of the starvation level, the net speed (i.e. measuring the distance traversed in a bee-line) increases and the turning tendency decreases with the time the animals have been deprived of food. The longevity of starving females increases with the relative humidity of the environment where they were kept. These results are compared with similar data for the spider miteTetranychus urticae Koch in order to discuss their possible effect on the dynamics on the predator-prey system they form.

Résumé

Dans ce travail on étudie quelques-uns des processus qui contrôlent ou influencent le mouvement des femelles de l'acarien prédateurPhytoseiulus persimilis Athias-Henriot quand elles se déplacent d'une plante à l'autre.

Des expériences réalisées pour étudier la préférence pour la lumière ou l'ombre des femelles deP. persimilis ont montré que plus la période durant laquelle elles ont été privées de nourriture est longue, ou plus basse est l'humidité relative du milieu où elles ont été maintenues, plus grande est leur préférence pour les lieux ombragés.

Tandis que la vitesse de déplacement est indépendante du degré d'inanition de l'animal, la vitesse nette appréciée en mesurant la distance entre le point initial et le point final en ligne droite, augmente avec le temps pendant lequel les acariens ont été privés de nourriture, tandis que la tendance à changer de direction diminue.

La longévité des femelles privées de nourriture (c'est-à-dire dans des conditions similaires à celles où elles se trouvent quand elles se déplacent entre les plantes) augmente avec l'humidité relative du milieu dans lequel elles ont été maintenues. Le rapport possible entre ce fait et le changement de la préférence pour la lumière ou l'ombre est discuté.

On compare les résultats obtenus avec des données similaires pour l'acarien phytophageTetranychus urticae Koch pour discuter sa possible influence sur la dynamique du système proie-prédateur.

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Bernstein, C. Some aspects ofPhytoseiulus persimilis [Acarina: Phytoseiidae] dispersal behaviour. Entomophaga 28, 185–198 (1983). https://doi.org/10.1007/BF02372143

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