La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Recolonisation potential of zooplankton propagule banks in natural and agriculturally modified sections of a semiarid temporary stream (DoA +/- ana, Southwest Spain)
Auteurs :	Dagmar Frisch, Auteur ; Arantza Arechederra, Auteur ; Andy J. Green, Auteur
Type de document :	Article
Dans :	Hydrobiologia (624(1) MAY 2009)
Article en page(s) :	115-123
Résumé :	The viable propagule banks of a temporary stream were studied from sections with different agricultural history. Hatching of zooplankton (copepods, rotifers and cladocerans) was recorded in the laboratory under controlled temperature and light conditions from an agriculturally modified area with average hydroperiods of about a week per year and two semi-natural reference areas with average hydroperiods of more than 3 weeks per year. We found significant differences in both taxon richness and abundance of zooplankton hatching between areas, which were lower in the agriculturally modified section, compared to the reference sections. Another factor likely to have influenced hatching in our experiment was conductivity, which differed between the two reference sections and might have affected hatching at high conductivities. For restoration purposes, hydrological reconnection of stream segments is important to facilitate dispersal from the high diversity upstream segments to the depleted sites downstream.

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