Abstract
Fil: Facelli Fernandez, Florencia. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico Conicet - Santa Fe. Instituto Nacional de Limnologia. Universidad Nacional del Litoral. Instituto Nacional de Limnologia; Argentina
Highlights
Dispersal is regarded as one of the key processes affecting the richness and composition of natural communities (Levine & Murrel 2003)
E. azurea was dominant in the main channel (MC), whereas E. crassipes was dominant in both types of secondary channels (HD and low discharge channels (LD))
The mean density of the seeds found in the drifting macrophyte stands was 168 ± 566 seeds/g, and ranged from 5.7 ± 4.4 seeds/g in the MC and 11.7 ± 12.9 seeds/g in high discharge secondary channel (HD) to 749.6 ± 1199.5 seeds/g in LD
Summary
Dispersal is regarded as one of the key processes affecting the richness and composition of natural communities (Levine & Murrel 2003). By dispersing seeds at some distance from their source community, hydrochory may extend the species dispersal period into seasons different from the vegetative ones (Boedeltje et al 2004) and may be important for ecological and genetic continuity among disjunct populations (Andersson et al 2000). This may be important in floodplain systems, where aquatic habitats can remain isolated during long drought periods, and where the dependence on seed banks for recolonization and plant communities structuring may be high (Junk et al 1989; Neiff 1990). Most studies addressing seed buoyancy, evaluated this response variable only under standing water (Coops & Velde 1995; Danvind & Nilsson 1997), which may be not representative of what may happen
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