5/18/2015  |   10:30 - 10:45   |  103C

FURTHER DOWN THE RIVER : A NOVEL, SPECTROPHOTOMETRIC, IN-SITU TECHNOLOGY IMPROVING SPATIAL AND TEMPORAL DATA RESOLUTION TO ADDRESS HETEROGENEITY IN AQAUTIC SYSTEMS. Evaluating ecosystems requires understanding of the heterogeneity of such systems. Aquatic systems exhibit variability over space and time; seasonal and daily fluxes induce transient biogeochemical conditions, and spatial differences give rise to hot spots of activity. Biological activity of riverine and lacustrine environments can be assessed by observing nutrient uptake and transformation. Recent advances in field spectrophotometers were combined with inexpensive technology to produce an automated, programmable system capable of high frequency data at the space/time scale. The system utilizes multiple intake ports and is designed for use in field mesocosm studies to provide increased number of replicates and high confidence of results. Preliminary data shows high reliability in measuring nitrate, TN, COD, DOC, sulfate, and several metals. Tracking of additional parameters can be performed using simple PLSR methods. Present research with the developed system includes quantifying nitrogen uptake rates in a pre-restoration stream using in-situ, mesocosm drums. Findings include high data resolution showing seasonal change and spatial variability along the reach in N-uptake rates.

Bryan Maxwell (POC,Primary Presenter), NCSU, bmmaxwel@ncsu.edu;

5/18/2015  |   10:45 - 11:00   |  103C

PHYTOREMEDIATION OF HEAVY METAL-POLLUTED AQUATIC ECOSYSTEM (OLOGE LAGOON) BY WATER HYACINTH (Eichhornia crassipes [Mart.] Solms) AND THE SOCIO-EGOLOGICAL IMPLICATIONS The indiscriminate discharge of industrial effluents containing harmful substances such as heavy metals has become a global problem. Water hyacinth has been considered a menace since it entered Nigerian inland waters. This study investigated the ability of water hyacinth in passive phytoremediation of heavy-metal polluted aquatic ecosystems and the socio-ecological effects of the plant’s invasiveness. The study was conducted over a period of 18 months (July, 2013 – December, 2014) and 5 sampling stations (Owo River, Agbara, Otto Jetty, Morogbo and Etegbin) were chosen based on proximity to points of discharge of effluents, presence of water hyacinth and human activities. The metals investigated are Cu, Zn, Pb, Fe, Cd and As. The result showed that water hyacinth absorbs heavy metals from its environment and the rate of absorption depends on concentration of the metal. It was also discovered that the presence of water hyacinth and illegal sand mining has adversely affected the delivery of ecosystem services such as fisheries, tourism etc. The consequences of these unregulated anthropogenic actions are loss in biodiversity, food insecurity and ultimately threat to human lives.

CHINATU CHARITY NDIMELE (Primary Presenter/Author), UNIVERSITY OF IBADAN, OYO STATE, NIGERIA, charere1st@yahoo.com;


KANAYO STEPHEN CHUKWUKA (Co-Presenter/Co-Author), UNIVERSITY OF IBADAN, OYO STATE, NIGERIA, ks.chukwuka@mail.ui.edu.ng;


Olusegun Olufemi Whenu (Co-Presenter/Co-Author), LAGOS STATE UNIVERSITY, OJO, LAGOS STATE, NIGERIA, whenol@yahoo.com;


Ebere Samuel Erondu (Co-Presenter/Co-Author), University of Port Harcourt, Rivers State, Nigeria, eserondu@yahoo.com;


PRINCE EMEKA NDIMELE (Co-Presenter/Co-Author), LAGOS STATE UNIVERSITY, OJO, LAGOS STATE, NIGERIA, drpendimele@yahoo.com;

5/18/2015  |   11:00 - 11:15   |  103C

CHARACTERIZING ECOSYSTEM SERVICE BUNDLES FOR ANALYZING TRADEOFFS IN WATERSHED MANAGEMENT A key challenge of watershed management is determining how to manage multiple ecosystem services across landscapes. Enhancing important provisioning services, such as food production and drinking water, often leads to tradeoffs between regulating and cultural ecosystem services, such as water purification, habitat quality, carbon sequestration, and tourism. Ecosystem service bundles are defined as areas on a landscape where ecosystem management produce sets of ecosystem services. This is the case for the Kiamichi River watershed in southeastern Oklahoma, which provides many essential benefits to local residents, visitors and a nearby urban area (Oklahoma City). We used mapping techniques and contingent valuation methods to identify community perceptions and economic values of ecosystem services including freshwater provision, water regulation, air quality, habitat for species, and recreation. Our results identified areas with similar capacity to provide sets of services, and showed significant differences in how ecosystem services beneficiaries perceived their social and economic value. Overall, we found strong relationships among the capacity of a watershed to provide services and social perception of those services

Antonio J. Castro (Primary Presenter/Author), Oklahoma Biological Survey, University of Oklahoma, acastro@ou.edu;


Caryn C. Vaughn (Co-Presenter/Co-Author), University of Oklahoma, cvaughn@ou.edu;


Jason P. Julian (Co-Presenter/Co-Author), Texas State University, jason.julian@txstate.edu;

5/18/2015  |   11:15 - 11:30   |  103C

COMBINING RESULTS FROM FIELD OBSERVATIONS AND EXPERIMENTS TO INFORM MANAGEMENT STRATEGIES FOR A HEAVILY USED LAKE WITH LOTS OF PROBLEMS Silver Lake is a small, mesotrophic lake in western Michigan (USA) that has experienced fish kills and cyanobacterial blooms (Gloeotrichia) during the past four years. The lake and its affiliated state park are tourist destinations because of its location adjacent to Lake Michigan and large sand dunes, which attract approximately 20,000 visitors each summer. To address homeowner concerns about deteriorating water quality, a 3-year study was initiated consisting of external and internal nutrient load determination, bioassays to assess nutrient limitation (control, +P, +N, +N+P), and cyanotoxin analyses. Data from the year one field campaign indicated that internal phosphorus loading was negligible. The bioassay results indicated that plankton appear to be N+P co-limited, neither Gloeotrichia nor microcystin levels responded significantly to nutrient amendments, and microcystin concentrations remained below World Health Organization standards for recreational water use, regardless of treatment. USGS scientists are measuring surface inflow and groundwater nutrient loads; data will be compiled to create nutrient budgets and determine sources.

Alan Steinman (Primary Presenter/Author), Annis Water Resources Institute-Grand Valley State University, steinmaa@gvsu.edu;


Mary Ogdahl (Co-Presenter/Co-Author), AWRI-Grand Valley State University, ogdahlm@gvsu.edu;


Maggie Weinert (Co-Presenter/Co-Author), AWRI-Grand Valley State University, weinemag@gvsu.edu;


Nadia Gillett (Co-Presenter/Co-Author), Portland State University, nadia.gillett@gmail.com;

5/18/2015  |   11:30 - 11:45   |  103C

BEYOND OUR REACH? EXTRAPOLATING NETWORK-SCALE AQUATIC METABOLISM FROM REACH-SCALE OBSERVATION Understanding aquatic metabolism at watershed to global scales requires extrapolation of reach-scale measurements to entire river networks. River network scale models of aquatic metabolism must account for between-reach variability of gross primary production, respiration, and related factors including reaeration and groundwater gas inputs. Key questions are how heterogeneity of metabolism drivers impacts scaling from reach to network. The Framework for Aquatic Modeling of the Earth System (FrAMES) was used to predict daily metabolism along the river continuum and test results using measured dissolved oxygen. We applied the model in two contrasting watersheds, upper Coweeta Creek (16.3 km2), NC, and Kings Creek (15.3 km2), KS. Model drivers were parameterized using field measurements or empirical relationships between metabolism processes and drivers. Results indicate heterogeneity of aquatic metabolism drivers at the reach-scale impacts network-scale metabolism estimation. The validated model allows translation of small-scale, reach-based aquatic metabolism to entire watersheds, an important step towards expanding our understanding of aquatic metabolism from highly local to regional to cross biome scales.

Ken Sheehan (Primary Presenter/Author), University of New Hampshire, ken.r.sheehan@gmail.com;


Wilfred M. Wollheim (Co-Presenter/Co-Author), University of New Hampshire, wil.wollheim@unh.edu;


Kaitlin Farrell (Co-Presenter/Co-Author), University of Georgia, kfarrel@uga.edu;


Chao Song (Co-Presenter/Co-Author), Taizhou University, songchaonk@163.com ;


John S. Kominoski (Co-Presenter/Co-Author), Florida International University, jkominoski@gmail.com;


Matt Trentman (Co-Presenter/Co-Author), Flathead Lake Biological Station, University of Montana, matt.trentman@flbs.umt.edu;


Walter Dodds (Co-Presenter/Co-Author), Kansas State University, wkdodds@ksu.edu;


Amy D. Rosemond (Co-Presenter/Co-Author), University of Georgia, rosemond@uga.edu;


Ford Ballantyne (Co-Presenter/Co-Author), University of Georgia, fb4@uga.edu;


Janine Rüegg (Co-Presenter/Co-Author), University of Lausanne, janine.ruegg@unil.ch;