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Spatial and temporal variation of life-history traits documented using capture-mark-recapture methods in the vector snail Bulinus truncatus

Published online by Cambridge University Press:  09 October 2003

G. CHLYEH ,
P.-Y. HENRY  and
P. JARNE
G. CHLYEH
Affiliation:
Département de Zoologie, IAV Hassan II, BP 6202 Rabat Institut, Morocco
P.-Y. HENRY
Affiliation:
CEFE-CNRS, 1919 route de Mende, 34293 Montpellier Cedex 5, France
P. JARNE
Affiliation:
CEFE-CNRS, 1919 route de Mende, 34293 Montpellier Cedex 5, France
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Abstract

The population biology of the schistosome-vector snail Bulinus truncatus was studied in an irrigation area near Marrakech, Morocco, using demographic approaches, in order to estimate life-history parameters. The survey was conducted using 2 capture-mark-recapture analyses in 2 separate sites from the irrigation area, the first one in 1999 and the second one in 2000. Individuals larger than 5 mm were considered. The capture probability varied through time and space in both analyses. Apparent survival (from 0·7 to 1 per period of 2–3 days) varied with time and space (a series of sinks was considered), as well as a square function of size. These results suggest variation in population intrinsic rate of increase. They also suggest that results from more classical analyses of population demography, aiming, for example at estimating population size, should be interpreted with caution. Together with other results obtained in the same irrigation area, they also lead to some suggestions for population control.

Keywords

life-history traitscapture-mark-recapture methodspopulation dynamicsschistosome-vectorfreshwater snail
Type
Research Article
Information
Parasitology , Volume 127 , Issue 3 , September 2003 , pp. 243 - 251
Copyright
© 2003 Cambridge University Press

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