Life cycle of the nematode Contracaecum rudolphii Hartwig, 1964 (sensu lato) from northern Poland under laboratory conditions |
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Authors: | J Dziekońska-Rynko J Rokicki |
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Institution: | (1) Faculty of Biology, University of Warmia and Mazury, 10-957 Olsztyn, ul. Oczapowskiego 5, Poland;(2) Department of Invertebrate Zoology, University of Gdańsk, Gdynia, Al. Piłsudskiego 46, Poland |
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Abstract: | Summary The study was aimed at following, under laboratory conditions, embryogenesis of the nematode Contracaecum rudolphii, and at identifying its intermediate hosts in northeastern Poland. Nematode eggs, isolated from the terminal part of the
female uterus, were placed in 0.9 and 3% NaCl solutions, 1% formalin, and in tap water. Each solution batch was divided into
3 parts kept at 4, 15, and 23°C. Regardless of the temperature they were exposed to, the eggs placed in 1% formalin showed
numerous deformations; as few as 5% of those eggs produced larvae. Embryogenesis was at its fastest in the eggs kept at 23°C.
While still within the eggs, the larvae underwent two moults. The eggs hatched to produce the stage 3 larvae, which emerged
surrounded by the cuticle of the preceding larval stage. Experimental infestations of zooplankton collected from Lake Kortowskie
showed that only cyclopoid copepods could serve as the intermediate hosts. No differences in the infestation intensity were
found between the guppies infested by the invasive larvae and those fed the infested cyclopoids. |
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Keywords: | Contracaecum rudolphii parasitic Nematoda cormorant embryogenesis life cycle |
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