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Horizontal distribution and abundance of cysts of several large branchiopods in temporary pool and ditch sediments
Authors:Thiéry  Alain
Institution:(1) Faculté des Sciences, Laboratoire de Biologie animale-hydrobiologie (U.P.R.E.S.-E.A. 2.152), 33 rue Louis Pasteur, F-84000 Avignon, France
Abstract:Cysts of three species of anostracans (Branchipusschaefferi, Chirocephalus diaphanus, and Tanymastigites perrieri), two species of Notostracans (Triops numidicus and Lepidurus apus) and one species of Spinicaudata (Leptestheriamayeti) were collected from the upper 2 cm of dry sediments at intervals along transects from a temporary pool in an arid zone of Morocco and from two ditches in France. The horizontal distribution of viable cysts was patchy and is discussed in relation to several ecological parameters prevailing during the aquatic phase. These include vegetation distribution, depth and morphometry of the pond, dominant wind pattern, and granularity of the sediments. The densities reached more than 1700 cysts of C. diaphanus per 100 cm2, and 1150 cysts of L. apus per 100 cm2 in the two ditches. The mean densities of cysts per 100 cm2 calculated for each transect ranged from 250 to 450 for C. diaphanous and 240 to 260 for L. apus (in the ditch populations) and about 1–6 for T. perrieri and L. mayeti, 3–15 for B. schaefferi, and16–58 for T. numidicus in the pool in Morocco. This revised version was published online in August 2006 with corrections to the Cover Date.
Keywords:Anostraca  cyst  France  horizontaldistribution  sediments  Morocco  Notostraca  Spinicaudata
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