Author:
Dunn T. S.,Ownbey T. C.,Vannarath T.
Abstract
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.
Publisher
Canadian Science Publishing
Subject
Animal Science and Zoology,Ecology, Evolution, Behavior and Systematics
Cited by
9 articles.
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