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CYST PRODUCTION IN THE FAIRY SHRIMP, STREPTOCEPHALUS PROBOSCIDEUS (ANOSTRACA) IN RELATION TO ALGAL AND LORICATED ROTIFER DIET

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Adult fairy shrimps, Streptocephalus proboscideus (Frauenfeld, 1873) reared separately using algae (Scenedesmus acutus Meyen), a large loricate rotifer (Brachionus calyciflorus Pallas, 1766) and mixtures of algal and animal diets (1 : 1 ratio on a dry weight basis) at a rate of 17 mug DW ml 1 day 1 produced a mean number of 184 +/- 38, 111 +/- 14, and 160 +/- 14 cysts per brood, respectively. Of these, the rotifer-only diet was significantly inferior to both other food types. Measurements of cyst volume revealed an effect of food type. With all three types, S. proboscideus produced cysts in the size range of 3.0-9.0 x 106 mum3. However, sizes smaller than 3:0 x 106 mum3 occurred in algae-fed anostracans and those larger than 9:0 x 106 mum3 in rotifer-fed individuals. When the mean cyst production was expressed in terms of volume instead of numbers, there was a suggestion that the mixture of algae and rotifers was the superior combination, while females reared on rotifers produced a significantly (38%) lower total cyst volume. Hatchability of cysts, either dried or un-dried, was not significantly different between treatments.

Des adultes de l'Anostrace Streptocephalus proboscideus (Frauenfeld, 1873), ont ete eleves en utilisant separement des algues (Scenedesmus acutus Meyen), un grand rotifere (Brachionus calyciflorus Pallas, 1766) et des melanges d'aliments algaux et animaux (proportion 1 : 1 sur la base du poids sec) a un taux de 17 mug DW ml-1 jour-1. Ils ont produit un nombre moyen de cystes de, respectivement, 184 +/- 38, 111 +/- 14 et 160 +/- 14 par ponte. Parmi ces regimes, celui de rotiferes exclusivement etait significativement inferieur aux deux autres. Les mesures de volume des cystes revelaient un effet du type de nourriture. Avec les trois types, S. proboscideus produisait des cystes dans la gamme de tailles de 3,0-9,0 x 106 mum3. Cependant, des tailles inferieures a 3,0 x 106 mum3 etaient observees chez les Anostraces algivores et des tailles superieures a 9,0 x 106 mum3 chez les individus nourris de rotiferes. Quand la production moyenne de cystes etait exprimee, non en terme de nombre, mains en volume, il semblait que le melange d'algues et de rotiferes etait la meilleure combinaison, alors que les femelles nourries de rotiferes produisaient un volume total de cystes significativement inferieur (38%). La capacite d'eclosion des cystes, seches ou non, ne differait pas de facon significative suivant les traitements.

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/content/journals/10.1163/156854099503564
1999-07-01
2015-03-05

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