Synchronization of life cycles of three mermithids (Nematoda) with their chironomid (Diptera) hosts and some observations on the pathology of the infections

Autor:	William M. Hominick, H. E. Welch
Rok vydání:	1971
Předmět:	Ecology Host (biology) Zoology Aquatic animal Biology biology.organism_classification Polypedilum simulans Parasite hosting Instar Animal Science and Zoology Gastromermis Cladotanytarsus Ecology Evolution Behavior and Systematics Conopophaga
Zdroj:	Canadian Journal of Zoology. 49:975-982
ISSN:	1480-3283 0008-4301
DOI:	10.1139/z71-149
Popis:	The life cycles of three mermithid species were synchronized with those of the chironomid hosts. Hydromermis palustris overwintered as an advanced parasite in Cladotanytarsus sp., emerged in early May, and infected new hosts throughout the summer. Gastromermis deltensis overwintered as an early parasite, mainly in Harnischia sp., emerged in late May, and also infected new hosts throughout the summer. Hydromermis conopophaga probably overwintered as an egg, infected new hosts in spring, and emerged from Polypedilum simulans and Harnischia sp. in late June. It had only one generation per year. The chironomids overwintered as third instars. Cladotanytarsus sp. was the first to molt to the fourth instar in the spring, Harnischia sp. was second, and P. simulans last. Both Cladotanytarsus sp. and Harnischia sp. emerged throughout the summer; P. simulans had a limited period of emergence in the summer. The sex of the mermithids was correlated with their number per host. Intersexes in parasitized adult Harnischia sp. are described and illustrated.
Databáze:	OpenAIRE
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