The significance of precocity in the transmission of the nematode parasites of vertebrates

Autor:	Roy C. Anderson, Cheryl M. Bartlett
Rok vydání:	1993
Předmět:	Larva Developmental stage biology Intermediate host Zoology Fourth stage biology.organism_classification law.invention Transmission (mechanics) Nematode law Animal Science and Zoology Primordium Ecology Evolution Behavior and Systematics Large size
Zdroj:	Canadian Journal of Zoology. 71:1917-1922
ISSN:	1480-3283 0008-4301
DOI:	10.1139/z93-275
Popis:	The significance of precocity in the transmission of heteroxenous parasitic nematodes is reviewed. Precocity of nematodes in intermediate hosts manifests itself in the following ways depending on the species: (i) the unusually large size of the infective larva; (ii) the advanced development of the genital primordium in the infective larva; (iii) development to the fourth stage in the intermediate host; and (iv) development to the subadult stage (early fifth stage) in the intermediate host. Precocity apparently accelerates gamete and egg production in the definitive host when the behaviour of intermediate and definitive hosts restricts transmission to confined limits of space and time. Examples of precocity are outlined and, whenever possible, related to the behaviour of definitive and intermediate hosts during transmission.
Databáze:	OpenAIRE
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