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How long does it take to deplete the egg bank in wetland sediments?
Petrie, Rochelle1 Rochelle.Petrie@csiro.au
Nielsen, Daryl1 Daryl.Nielsen@csiro.au
Vogel, Matthew1 Matthew.Vogel@csiro.au
Brock, Margaret2 mbrock@dlwc.nsw.gov.au
1Murray-Darling Freshwater Research Centre PO Box 991 Wodonga Victoria 3689 Australia
2Department of Natural Resources PO Box U245 Armidale NSW 2351 Australia
Keywords [wetlands, microfauna, dormancy, egg bank]
Microfauna from wetland systems within Australia are adapted to long dry periods and can survive by persisting as eggs in the sediment. These egg banks contain the diversity of microfauna to enable a community to develop rapidly upon re-wetting. Little is known about the longevity and persistence of these dormant eggs. This paper examines how the egg bank is depleted over time. As part of a large mesocosm experiment, microfauna emerging from Macquarie Marshes sediment were collected for 8 months, and the number and richness of animals was determined. Results show that there is a rapid increase in the abundance and richness of microfauna emerging within the first 28 days before declining over time. Estimates of the size of the egg bank suggest that there are more than 1.7x106 eggs m2 and that not all eggs respond immediately to re-wetting.