OOS 2 - Dynamics and Changing Roles of Freshwater Macrophyte Vegetation

Monday, August 8, 2011: 1:30 PM-5:00 PM
17A, Austin Convention Center
Organizer: John E. Titus
Co-organizer: Bin Zhu
Moderator: John E. Titus
Background: Shallow water habitats are frequently subject to adverse impacts of land use change, simply because of their low-lying positions in our landscapes. Effective management and restoration of these habitats – and in particular the macrophytes they harbor – will require greater understanding of vegetation dynamics and of the roles played by different species. Goals/objectives: (1) Promote communication among freshwater macrophyte researchers, and (2) stimulate further research on macrophyte community ecology with an eye toward application. Importance: The twin challenges of management and restoration – key components of stewardship for aquatic ecosystems – cannot be separated from the basic ecology of these systems. Diverse, oft-isolated macrophyte scientists need more avenues for communication. Interest to ESA: Similar successful sessions in the past attracted macrophyte researchers who would not otherwise have attended ESA. This session should be of particular interest to members of ESA’s Aquatic Section, and to anyone captivated by the general topic of vegetation dynamics – especially as it relates to invasive species and functional change. Theme and structure of session: Community compositional change in freshwater macrophyte communities can have ramifications for consumer populations and for ecosystem processes because different plant species may play different roles. The focus of presentations in this session will range from the identification, success, and management of individual species, to diverse impacts of different macrophyte species within their habitats, to community compositional change itself. Most of the talks center on invasive species, whose dominance continues to challenge our abilities to understand and restore function in shallow-water habitats.
1:30 PM
DNA fingerprinting of Hydrilla, Egeria, and Elodea (Hydrocharitacea) reveals new information on their range and recent history
Nancy Rybicki, US Geological Survey; Julie Kirshtein, USGA; Mary Voytek, National Aeronautics and Space Administration
1:50 PM
Nitrogen exploitation and its role in the explosive growth of the weedy invasive species, Hydrilla verticillata
R. Michael Smart, US Army Corps of Engineers; Dian H. Smith, University of North Texas
2:10 PM
Arundo donax bud population growth rate estimates based on transition matrix models: implications for management
David F. Spencer, USDA Agricultural Research Service; Marcel Rejmánek, University of California, Davis
2:30 PM
Ecological impacts and physical controls of an invasive macrophyte Hydrocharis morsus-ranae
Bin Zhu, University of Hartford; Lars G. Rudstam, Cornell University; Meghan E. Brown, Hobart & William Smith Colleges; Samuel E. Georgian, Hobart & William Smith Colleges; James Kopco, Cornell University; Bethany Bashaw, Hobart & William Smith Colleges
2:50 PM
Ecological roles, dispersal, and spread of the invasive submersed macrophyte Utricularia inflata
Rebecca A. Urban, Lebanon Valley College; John E. Titus, Binghamton University; James M. Doherty, University of Wisconsin-Madison
3:10 PM
3:20 PM
The diel and seasonal effects of submerged aquatic vegetation on nutrient dynamics and organic carbon bioavailability in a southeastern reservoir
Stephen D. Shivers, Joseph W. Jones Ecological Research Center; Stephen P. Opsahl, Joseph W. Jones Ecological Research Center; Alan P. Covich, University of Georgia
3:40 PM
Linking tidal wetland ecological function to vegetation attributes
Stuart E.G. Findlay, Cary Institute of Ecosystem Studies
4:20 PM
Declining ecosystem performance of a restored lake and marsh associated with a rapidly expanding population of invasive common carp (Cyprinus carpio)
Gary Sullivan, The Wetlands Initiative, Inc.; Przemek G. Bajer, University of Minnesota; Peter W. Sorenson, University of Minnesota
4:40 PM
Establishing native macrophytes on two Central Texas reservoirs
Mary P. Gilroy, City of Austin; Lynde L. Dodd, University of North Texas; Gary O. Dick, USACE ERDC
See more of: Organized Oral Session
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