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Sediment/Benthic Community. Josh Scott Shaun Lacy John Robbins Owen Means. Outline. Introduction Objectives Hypothesis Methods Results Discussion. Introduction. Landowner objective: Learning potential for small fishery Suitable pond conditions?. Objectives.

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Sediment benthic community

Sediment/Benthic Community

Josh Scott Shaun Lacy John Robbins Owen Means


Outline
Outline

  • Introduction

  • Objectives

  • Hypothesis

  • Methods

  • Results

  • Discussion


Introduction
Introduction

Landowner objective:

  • Learning potential for small fishery

    • Suitable pond conditions?


Objectives
Objectives

  • Determine composition of sediment

    • % organic matter

    • % water content

  • Estimate density and diversity of macroinvertebrates


Hypothesis
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


Methods
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


Results
Results

KB-Cores

  • Higher water content deeper in the sediment

  • Higher organic content deeper in the sediment


Results continued
Results continued

Ekman dredge

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


Discussion
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)


Recom m endations
Recommendations

  • Nutrient inputs

    • Difficult to control nutrient inflow from agriculture

      • Try to reduce fertilizer use on and around property

  • Resample to determine sediment accumulation


Literature cited
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.



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