Download - Sediment/Benthic Community
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Josh Scott Shaun Lacy John Robbins Owen Means
Sediment/Benthic Community
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IntroductionObjectivesHypothesisMethodsResultsDiscussion
Outline
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Landowner objective:Learning potential for small fishery
Suitable pond conditions?
Introduction
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Determine composition of sediment% organic matter% water content
Estimate density and diversity of macroinvertebrates
Objectives
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High water content equally throughout sediment
High organic mater in the top portion of the sediment
High concentrations of macroinvertebrates in the shallow areas
Hypothesis
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Jones’ pond (15 miles southeast of Moscow)KB-Core
Triplicate samples at (2.7 m)Measured, weighed, dried, fried
Ekman dredgeTriplicate samples at (2.7 m)Sub-sampled, counted organisms
Methods
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KB-Cores
Results
0.0 5.0 10.0 15.0 20.0 25.0 30.0 35.0 40.0 45.0 50.00.0
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WaterOrganic
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Figure 1. Water and organic content of sediment samples taken at 2.7 m depth from Jones' pond Latah Co., Idaho 2008.
• Higher water content deeper in the sediment• Higher organic content deeper in the sediment
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Ekman dredge
Results continued
Replicate 1 2 3 Mean (#/m^2) SD SE
Oligochaete 65244 32889 164444 87525.93 68549.72 39577.20
Table 1. Macroinvertebrate density from Ekman dredge sampling of Jones’ pond Latah Co., Idaho 2008.
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Sediment4cm of sediment accumulation since pond was filledWater 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)
Discussion
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Nutrient inputsDifficult to control nutrient inflow from
agricultureTry to reduce fertilizer use on and around property
Resample to determine sediment accumulation
Recommendations
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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.
Literature cited
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Questions?