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Assessing Sediment and Macroinvertebrate Density in Jones’ Pond, Idaho

This study investigates the sediment composition and macroinvertebrate density at Jones’ Pond, located southeast of Moscow, Idaho. Objectives include assessing organic matter and water content in sediments and estimating macroinvertebrate diversity. Hypotheses suggest that water and organic matter will be unevenly distributed in sediment layers, with higher concentrations in shallow areas. Results reveal higher water and organic content deeper in the sediment, with dominant oligochaete populations noted. Recommendations for managing nutrient inflows to the pond are also discussed.

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Assessing Sediment and Macroinvertebrate Density in Jones’ Pond, Idaho

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  1. Sediment/Benthic Community Josh Scott Shaun Lacy John Robbins Owen Means

  2. Outline • Introduction • Objectives • Hypothesis • Methods • Results • Discussion

  3. Introduction Landowner objective: • Learning potential for small fishery • Suitable pond conditions?

  4. Objectives • Determine composition of sediment • % organic matter • % water content • Estimate density and diversity of macroinvertebrates

  5. Hypothesis • High water content equally throughout sediment • High organic mater in the top portion of the sediment • High concentrations of macroinvertebrates in the shallow areas

  6. Methods Jones’ pond (15 miles southeast of Moscow) • KB-Core • Triplicate samples at (2.7 m) • Measured, weighed, dried, fried • Ekman dredge • Triplicate samples at (2.7 m) • Sub-sampled, counted organisms

  7. Results KB-Cores • Higher water content deeper in the sediment • Higher organic content deeper in the sediment

  8. Results continued Ekman dredge Table 1. Macroinvertebrate density from Ekman dredge sampling of Jones’ pond Latah Co., Idaho 2008.

  9. Discussion Sediment • 4cm of sediment accumulation since pond was filled • Water content higher at bottom of sediment • Opposite of normal results Macroinvertebrate • Only oligochaetes were found • 87,526/m2 (SE 39,577) • EPA rating in Detroit River 5,000/m2 (Ciborowski 2008) • Farm ponds in Philippines 0-32,000/m2 • Density positively correlated with high nutrients and/or organic matter (Simpson et al. 2004)

  10. Recommendations • Nutrient inputs • Difficult to control nutrient inflow from agriculture • Try to reduce fertilizer use on and around property • Resample to determine sediment accumulation

  11. Literature cited • Ciborowski, J. 2008. [Online] Detroit River-Western Lake Erie Basin Indicator Project. Available: http://www.epa.gov/med/grosseile_site/indicators/oligochaetes.html • Simpson, I.C., Roger, P.A., Oficial, R., and Grant, I.F. 2004. Density and composition of aquatic oligochaete populations in different farmers’ ricefields. Biology and Fertility of Soils 16: 34-40.

  12. Questions?

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