Differential Bioaccumulation & Speciation of Hg Among Four Species of Turtles in the South River
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1 Differential Bioaccumulation & Speciation of Hg Among Four Species of Turtles in the South River
2 The people who did all the work Chris Romanek, Ph.D. Christine Bergeron Jerry Husak, Ph.D. Jason Unrine, Ph.D.
3 Broad Objectives Determine what species of herpetofauna are present in the South River, and what sites are best suited for study Determine whether herpetofauna accumulate Hg in their tissues and if factors such as site, species, sex, or size influence Hg accumulation Determine whether herpetofauna accumulate Hg at high enough levels to warrant further studies on reproductive success
4 Why are Turtles Critical Additions to the South River Ecological Study? Long-lived Trophic Position Ectothermic Physiology Aquatic/Non-migratory Important Prey Seven types of meat
5 The cast of characters
6 Snapping turtle (Chelydra serpentina)
7 Stinkpot (Sternotherus odoratus)
8 Painted Turtle (Chrysemys picta)
9 Red Bellied Turtle (Pseudemys rubriventris) Husak et al., in prep
10 Methods South Fork Shenandoah River North River 22 Grottoes Middle River Honeysuckle Hill Farm (MR Ref) 20 Grand Caverns 15 Harriston 11 Augusta FC & downstream properties Swoope (MR Ref) South River 10 Crimora 5 Dooms Map Modified from Ariel White Moss & Locust Street (SR Ref) 2 Basic Park
11 Methods Baited Hoop Traps
12 Mass, sex, carapace & plastron dimensions 1 ml blood from tail or cervical sinus (2 sample subset) Permanently marked with unique ID
13 Gravid Females
14 Analytical methods Total Hg: Direct Hg Analyzer Methyl Hg/Total Hg: gas chromatographic cold-vapor atomic fluorescence spectrometry (GC-CVAFS) & ICPMS Selenium: ICPMS Stable isotopes: Isotope Ratio Mass Spectrometry Advanced Analytical Center for Environmental Sciences
15 Sample Sizes Site C. serpentina S. odoratus C. picta P. rubriventris Totals MR Ref SR Ref Totals
16 Blood Hg concentration (ppb) C. serpentina S. odoratus C. picta P. rubriventris Sex: p = Size: r 2 = N = 552 Turtles 0 MR Ref SR Ref River Mile Bergeron et al., in prep
17 2500 Stable Isotopes Blood THg ppb C. serpentina S. odoratus C. picta P.rubriventris r 2 = 0.54 p < *n = per species River mile only Blood δ 15 N Bergeron et al., in prep
18 THg MMHg %MMHg N = 36 C. serpentina Mercury Concentration (ppb) MR SR Ref Ref N = S. odoratus % Methyl Mercury MR SR Ref Ref River Mile Bergeron et al., in prep
19 Do the observed Hg concentrations in turtle blood warrant further studies on reproductive success? First clutch of P. rubriventris ever found west of the Northern Piedmont
20 Relationship between Hg and Se in Blood 4 r = 0.20, p = Log THg ppb C. serpentina S. odoratus C. picta P. rubriventris n = 134 total n = per species Log Se ppb Bergeron et al., in prep
21 Conclusions Turtles inhabiting the South River have elevated [Hg] in their blood compared to reference turtles, but accumulation is species-dependent [Hg] in blood were not as high as we predicted based on the life history and ecology of some turtles THg in blood is predominately MMHg (75-100%) in all species, but interesting trends exist among sites [Hg] in turtles warrant effects-based studies, but Se could be protective against Hg toxicity???
22 Preliminary Reproductive Data
23 Log Egg Hg (ppb) n = 21 What about Hg in turtle eggs? r 2 = 0.68; p < Log Maternal Blood Hg (ppb) C. serpentina S. odoratus C. picta P. rubriventris
24 Hg concentrations in amphibians warrant further studies on reproductive success Salamander whole body concentrations up to 9.3 ppm dry mass Frog and salamander egg concentrations up to 1.7 ppm dry mass
25 The Path Forward Amphibian Reproduction (January April 2007) Spatial Hg Patterns Species Hg Patterns Female-Egg Hg Relationships Egg Hg-Hatching Relationships Turtle Reproduction (April - July 2007) Female-Egg Hg Relationships Egg Hg-Hatching Relationships Incorporate Findings Into Larger Food Web Study
26 Acknowledgements Dan Cristol The Cristol Crew: Ariel White Scott Friedman Rebecka Brasso Anne Condon & The Undergraduates! Sarah DuRant Sarah Budischak Heather Brandt John Schmerfeld Mike Newman Don Kain Landowners along the South and Middle Rivers
27 The best reason to study herpetofauna
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