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AQUATIC CONSERVATION:MARINE AND FRESHWATERECOSYSTEMS Aquatic Conseru:Mar. Freshw. Ecosyst. ll:45-57 (2001)
 

Summary: AQUATIC CONSERVATION:MARINE AND FRESHWATERECOSYSTEMS
Aquatic Conseru:Mar. Freshw. Ecosyst. ll:45-57 (2001)
Impact of hydropattern disturbunceon cruyfish population
dynamics in the seusonalwetlandsof EaergladesNational
Parko USA
CHARLES A. ACOSTA* and SUE A. PERRY
South Florida Natural ResourcesCenter, EuergladesNational Park, Homestead, Florida, USA
ABSTRACT
1. The natural hydropattern in the seasonally-flooded marl prairie wetlands of Everglades
National Park has been severelydisrupted by human water control activities, seriously impacting
higher trophic organisms, e.g. wading birds, that depend on thesewetlands. Less is known about
the impacis on key aquatic fauna, such as crayfish Procambarusalleni, or how these populations
might respond to proposed habitat restoration strategies.
2. Under severeenvironmental stress,populations of burrowing crayfish are predicted to have
skewed size structure, low reproductive success,low survival, and widespread dispersal. As
predicted for populations in stressedhabitats, crayfish density was low, small dispersing adults
were dominant, juvenile abundance was low, and survival was low in habitats where the
hydroperiod (duration of flooding) was short and groundwater level was lowest.
3. -rayfish dispersed during flooding, but during the drydown, they burrowed rather than
sought deeper water. This dispersal strategy may be adaptive for surviving in seasonalwetlands,

  

Source: Acosta, Charles A. - Department of Biological Sciences, Northern Kentucky University

 

Collections: Environmental Sciences and Ecology