Skip to main content
U.S. flag

An official website of the United States government

Dry down impacts on apple snail (Pomacea paludosa) demography: Implications for wetland water management

January 1, 2008

Florida apple snails (Pomacea paludosa Say) are prey for several wetland-dependent predators, most notably for the endangered Florida snail kite (Rostrhamus sociabilis Vieillot). Management concerns for kites have been raised regarding the impacts of wetland dry downs on snails, but little data exists to validate these concerns. We simulated drying events in experimental tanks, where we observed that snail survival patterns, regardless of hydrology, were driven by a post-reproductive die off. In contrast to earlier reports of little to no dry down tolerance, we found that 70% of pre-reproductive adult-sized snails survived a 12-week dry down. Smaller size classes of snails exhibited significantly lower survival rates (< 50% after eight weeks dry). Field surveys showed that 77% of egg production occurs in April-June. Our hydrologic analyses of six peninsular Florida wetlands showed that most dry downs overlapped a portion of the peak snail breeding season, and 70% of dry downs were ??? 12 weeks in duration. Dry down timing can affect recruitment by truncating annual egg production and stranding juveniles. Dry down survival rates and seasonal patterns of egg cluster production helped define a range of hydrologic conditions that support robust apple snail populations, and illustrate why multiple characteristics of dry down events should be considered in developing target hydrologic regimes for wetland fauna. ?? 2008, The Society of Wetland Scientists.

Citation Information

Publication Year 2008
Title Dry down impacts on apple snail (Pomacea paludosa) demography: Implications for wetland water management
DOI 10.1672/07-115.1
Authors P.C. Darby, R.E. Bennetts, H.F. Percival
Publication Type Article
Publication Subtype Journal Article
Series Title Wetlands
Series Number
Index ID 70030582
Record Source USGS Publications Warehouse
USGS Organization