2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

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6/08/2017 | 2:15 PM - 2:30 PM | WATERSHED LAND USE INFLUENCES THE RESOURCE QUALITY AND ELEMENTAL COMPOSITION OF THE RIVERINE MACROPHYTE, PODOSTEMUM CERATOPHYLLUM MICHX. | 306B

WATERSHED LAND USE INFLUENCES THE RESOURCE QUALITY AND ELEMENTAL COMPOSITION OF THE RIVERINE MACROPHYTE, PODOSTEMUM CERATOPHYLLUM MICHX.

The riverine macrophyte Podostemum ceratophyllum (aka Hornleaf Riverweed) is ecologically important in mid-order rivers in eastern North America. The plant grows attached to stable benthic substrate in fast flowing water where it absorbs nutrients from the water column. Podostemum positively influences invertebrate biomass and is consumed by a variety of riverine fauna, however, little is known about the quality of resources the plant provides to consumers, or how watershed land use is reflected in the elemental composition of the plant. We collected Podostemum from over 60 locations across 11 states between Georgia and Maine. We used optical emission spectroscopy (OES) and isotopic analysis to examine the elemental composition of plant tissue and compared composition to watershed land use using linear mixed modeling. Our data indicate that land use changes elemental ratios and the resource quality of plant tissue. This research provides new insight into benthic resource storage and flux in mid-order eastern North American Rivers.

C27 Landuse and Non-Point source Impacts
S03 Stressing the 'Eco' in Freshwater Ecotoxicology
C25 Food Webs

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Presenters/Authors

James Wood (), University of Georgia, wood@uga.edu;