SS3.16 Lentic-Lotic Linkages in Freshwaters: Comparisons from Different Ecosystems
Date: Thursday, June 13, 2002
Location: Poster Session - VCC
 
FrischD, University of Mississippi, Oxford, USA, dfrisch@olemiss.edu
Threlkeld, S, T, University of Mississippi, Oxford, USA, stt@olemiss.edu
 
FLOOD-MEDIATED DISPERSAL VERSUS DORMANCY: ALTERNATIVE COLONISATION STRATEGIES OF COPEPODS IN THE LITTLE TALLAHATCHIE FLOODPLAIN
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Dormancy during dry periods and migration from permanent ponds are alternative colonisation strategies for copepods in ephemeral floodplain waterbodies, although the significance of either strategy is not yet fully understood. In the Little Tallahatchie floodplain, several floods of short duration occur in winter and spring. During floods, lentic and lotic waterbodies of different size are connected for a limited period (about a week) after which they become isolated. Hatching experiments from sediments of temporary ponds taken during the terrestrial phase documented the oversummering of 7 copepod species. At least 6 additional species were recorded from water samples of the same ponds taken at the first flood after the dry period. Our results indicate rapid colonisation by flood-mediated movement of individuals from permanent into adjacent temporary waterbodies, as well as by dormant individuals hatching after the dry period.