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Integrating Mesocosm Experiments and Field Data to Support Development of Water Quality Criteria

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Integrating Mesocosm Experiments and Field Data to Support Development of Water Quality Criteria Integrating mesocosm experiments and field data to support development of water quality criteria Will Clements Colorado State University Fort Collins, CO Field High assessments Mesocosm experiments Laboratory toxicity tests Low Spatiotemporal RealismScale & Low High Control & Replication Criticism of Small-Scale Experiments in Ecological Research “Microcosm experiments have limited relevance in community and ecosystem ecology” “Irresponsible for academic ecologists to produce larval microcosmologists” • Provide fast results: good for career development • Keep faculty on campus under the watchful eye of administrators Carpenter, 1996 Overview • Differences between field & lab responses to contaminants • A few hypotheses to explain these differences • Application of mesocosm experiments to test these hypotheses and to support the development of water quality criteria Spatially extensive and long-term surveys of metal-contaminated streams in Colorado EPA EMAP (n = 95) USGS & CSU (n = 154) S. Platte River Green R. Denver Colorado Springs Arkansas River Rio Grande Test Reference Probability Mineral Belt Quantify relationship among metals, aquatic insect communities and other environmental variables Sensitivity of aquatic insects (especially mayflies) Highly significant effects on mayflies at relatively low metal concentrations 160 140 Total mayfly abundance 120 100 F=14.01 s.e.) + p<0.0001 80 60 Mean ( Mean 40 20 0 < 1 CCU1-2 CCU2-10 CCU> 10 CCU Metal Category Clements et al. 2000 Schmidt, Clements & Cade, 2012 But, lab toxicity data do not reflect this sensitivity Copper Zinc Species LC50 Species LC50 Ephemerella subvaria 320 µg/L Ephemerella sp. > 68.8 mg/L Drunella grandis 201 µg/L Cinygmula sp 68.6 mg/L Stenonema sp. 453 µg/L Drunella doddsi > 64.0 mg/L Drunella grandis 190 µg/L Rhithrogena hageni 50.5 mg/L Rhithrogena hageni 137 µg/L Baetis tricaudatus 11.6 mg/L Isonychia bicolor 223 µg/L Baetis tricaudatus > 2.9 mg/L Warnick and Bell 1969; Goettl et al. 1972; Dobbs et al. 1994; Brinkman & Johnston 2008; Brinkman et al. 2012; Mebane et al. 2012 Similar patterns with major ions Conductivity benchmark 300 µS/cm Source Endpoint Response Reference (µS/cm) Road salt (lab) Insect survival & drift (96 h 3,526-10,000 Blasius & Merritt LC50) (2002) Road salt (lab) Insect survival (72 h LC50) 5,500-25,000 Kellford et al. (2003) Salt mining Stream invertebrates (72 h 5,000 Canedo- (mesocosm) survival) Arguelles et al. (2012) Road salt (lab) Chironomus survival & 5,000 Lob & Silver emergence (67 d) (2012) MTM-VF (field) Community composition of < 500 Pond et al. stream invertebrates (2009) MTM-VF (field) Community composition of 300 USEPA (2011) stream invertebrates Cormier et al. (2013) A few hypotheses to explain these differences 1. Interspecific interactions Metal exposure resulted in greater susceptibility of aquatic insects to predation (Clements et al 1989; Kiffney 1996; Clements 1999) 2. Dietary exposure (Irving, Baird & Culp 2003; Xie, Funk & Buchwalter 2010; Xie & Buchwalter 2011; Cadmus 2010) Reduced Grazing on Zn-Contaminated Periphyton Clean Periphyton Zinc-Contaminated Periphyton Before After 3. Short-term (96 h) experiments are inadequate for assessing effects of contaminants on aquatic insects Species Days required to reach steady state (Cd) Rhithrogena 5588 Ephemerella 399 Rhyacophila 41 (Buchwalter et al. 2007) 4. Physical influences (Fe oxides) 5. Sensitivity of early instars to metals Baetis Rhithrogena tricaudatus hageni Pteronarcells Ephemerella badia infrequens Proportion Mortality Proportion Size (mm) Kiffney & Clements 1996 Laboratory experiments with early instar mayflies (Neocloeon triangulifer) exposed to major ions Toxicant Endpoint Response Reference (µS/cm) Brine salt Growth (20 d) Johnson et al. 672 (2015) Reconstituted Survival (35 d) Kunz et al. 800-1300 MMVF waters (2013) NaCl Survival to Soucek and pre-emergent Dickinson 939 nymph stage (2015) (23 d) Using mesocosm experiments to support development of water quality criteria •Establish concentration-response relationships •Identify “safe” concentrations (e.g., EC20s) •Examine multiple stressors & stressor interactions •Measure nontraditional endpoints (e.g., drift, metabolism) •Investigate context dependency Stream Microcosm Experiments Date Stressor Oct 1991 Zn Variables Jul 1992 & Sept 1992 Cd, Cu, Zn Season Nov 1993 & Aug 1996 Zn Concentration Aug 1997 Cd, Cu, Zn Metal combinations Oct 1998 Cd, Zn Other stressors Nov 1999 Cd, Cu, Zn Source of community Aug & Oct 2000 Cd, Cu, Zn Jul 2002 & May 2003 Cd, Cu, Zn Endpoints Sep 2003 Zn Survival Aug 2003 Cd, Cu, Zn Size-specific mortality September 2007 Cu Metal uptake October 2007 Cu, Zn Community comp. October 2010 & May 2012 Fe Drift & immigration July, 2011 & 2012 Fe, Cu, Zn Community metabolism July 2012 Cu + Hardness Leaf decomp. Oct 2013 to Aug 2014 Major ions Aug & Sept 2014 Activated carbon Interactions among metals Mayfly abundance 8 Cu Cu+Zn 6 Lab-based 4 results U.S. EPA Criterion For Cu = 5 µg/L 2 Ln(Number per Stream+1) per Ln(Number 0 0 1 2 3 4 5 6 7 Ln (Cu + 1) Clements et al. 2013 Effects of major ions on benthic communities Cache la Poudre River South Fork of the Michigan River 4 Mesocosm Experiments: • NaHCO3 • MgSO4 • NaCl (2 experiments) Colonization of Clean & Contaminated Substrate in the Animas River, CO 500 400 200 CleanClean substrate 150 Metal-contaminatedContaminated substrate 100 No. individuals No. Water Flow 50 0 Capniidae Simuliidae Nemouridae Heptageniidae Chloroperlidae Chironomidae Ephemerellidae Rhyacophilidae Taeniopterygidae Courtney & Clements 2002 Seasonal Variation in Sensitivity to Metals Size distribution of Rhithrogena Responses to metals in summer & spring in summer & spring 80 Summer, 2002 50 Summer 2002 Spring,2003 40 60 30 40 abundance Frequency 20 20 Spring 2003 10 0 Rhithrogena 0 -20 < 0.10 --------- >4.00 0 20 40 60 80 100 0.10-0.120.12-0.140.14-0.160.16-0.20 0.25-1.001.00-1.992.00-2.993.00-3.99 Mass (mg) CCU Clark & Clements 2006 Community Metabolism (light/dark O2 measurements) Context-dependent Responses to Contaminants Reference stream Arkansas River Sub-alpine Foothills stream stream Use of Mesocosm Experiments to Support the Development of Water Quality Criteria • Ecologically realistic conditions & endpoints • Test hypotheses to explain discrepancies between lab & field • Essential for stressors that show little direct toxicity in the lab (e.g., nutrients, Fe) Thanks! >100 CSU graduate & undergraduate students Funding: U.S. EPA, USGS, U.S. FW&S, CDOW, NIEHS IZA, ICA, Rio Tinto .
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