In vitro excystment of the metacercariae of Gynaecotyla adunca and Probolocoryphe uca (Microphallidae) from the fiddler crab, Uca pugilator

Autor:	T. S. Dunn, T. C. Ownbey, T. Vannarath
Rok vydání:	1990
Předmět:	biology Decapoda Ecology Zoology biology.organism_classification Gynaecotyla adunca Crustacean Fiddler crab Uca pugilator Ultrastructure Parasite hosting Animal Science and Zoology Trematoda Ecology Evolution Behavior and Systematics
Zdroj:	Canadian Journal of Zoology. 68:2376-2384
ISSN:	1480-3283 0008-4301
DOI:	10.1139/z90-330
Popis:	A high rate and percentage of excystment of Probolocoryphe uca metacercariae occur at 40 °C in a low salt medium, in the absence of exogenous enzymes, indicating a largely active form of excystment. Exogenous trypsin is required for excystment of Gynaecotyla adunca metacercariae and it is presumed that excystment is largely a passive process. Saturated CO2 conditions promote excystment in this species, whereas high concentrations of pepsin, bile salts (especially deoxycholate), and extreme pH conditions have adverse effects on the process. Physicochemical factors operating in the in vitro excystment of the two microphallids are correlated with conditions presumed to prevail in the avian gut. Excysted metacercariae of both species begin egg production in vitro within several days. Such rapid development may be related to diverse definitive host capacities.
Databáze:	OpenAIRE
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