Summary
Experimental evaluation of the ecological tolerance of Rhipicephalus sanguineus was carried out by exposing all the postembryonic stages of development of this tick species to various combinations of temperature and relative humidity conditions, in both its fasting and replete phases, in order to investigate the influence of these two abiotic factors on their development and reproductive capacity, as well as on their ability to survive.
Experiments into the degree of reaction to its environment showed unequivocally that the security of survival of Rhipicephalus sanguineus, as well its capacity for development and reproduction, are determined by temperature and relative humidity. These influences are characterized by a generally directly proportional relationship to relative humidity and an indirectly proportional relationship to temperature.
The ability to propagate to the enzootic manifestation is only possible within the restricted range of temperature of 20–30° C and at a relatively high humidity. This tick is however capable of enduring critical temperature and humidity conditions for a given length of time, thus ensuring the continuation of the enzootic state.
Rhipicephalus sanguineus is however unable to exist as a field tick due to critical macroclimatic conditions in Germany in its special predilection for the dog as a host this species is presented with a biotope in which all the ecological prerequisites are available for its autochthonous enzootic manifestation and its epizootic dissemination.
Zusammenfassung
Zur experimentellen Bewertung der ökologischen Toleranzkapazität von Rhipicephalus sanguineus wurden alle postembryonalen Entwicklungsstadien dieser Zeckenart im nüchternen und vollgesaugten Zustand verschiedenen Kombinationen von Temperatur- und relativen Luftfeuchtigkeitsbedingungen ausgesetzt, um den Einfluß dieser beiden abiotischen Faktoren auf ihre Entwicklung, Reproduktionskapazität sowie ihr Überleben zu untersuchen.
In Untersuchungen zur ökologischen Reaktionsbreite von Rhipicephalus sanguineus konnte eindeutig nachgewiesen werden, daß die existentielle Sicherung dieser Zeckenart sowie deren Entwicklungs- und Reproduktionsvermögen von Temperatur und relativer Luftfeuchtigkeit bestimmt werden. Diese Beeinflussung ist dabei allgemein durch eine direkt proportionale Abhängigkeit von der relativen Luftfeuchtigkeit und eine umgekehrt proportionale Relation zur Temperatur gekennzeichnet.
Das Propagationsvermögen zur enzootischen Manifestation ist nur im engen Temperaturbereich von 20–30° C und bei hoher relativer Luftfeuchtigkeit möglich. Diese Zeckenart ist jedoch in allen ihren Entwicklungsstadien für eine bestimmte Zeit fähig, selbst kritische Temperatur- und Feuchtigkeitsbedingungen zu tolerieren und damit ihren enzootischen Fortbestand zu sichern.
Rhipicephalus sanguineus kann zwar auf Grund kritischer Makroklimabedingungen als Freilandzecke in Deutschland nicht bestehen, durch ihre besondere Wirtsprädilektion für Hunde wird dieser Zeckenart jedoch ein Biotop geboten, in dem alle ökologischen Voraussetzungen zur autochthon enzootischen Manifestation und epizootischen Ausbreitung gegeben sind.
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Gothe, R., Hamel, H.D. Zur Ökologie eines deutschen Stammes von Rhipicephalus sanguineus (Latreille, 1806). Z. F. Parasitenkunde 41, 157–172 (1973). https://doi.org/10.1007/BF00328759
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DOI: https://doi.org/10.1007/BF00328759