Sedimentation and MacroInvertebrate Species Identification By Tim Kuzan Andy Osler Kelly Farrens Andy Whelchel Michelle Bryntesen Outline Objectives Methods and Materials Results Discussion ID: 764219
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Sedimentation and Macro-Invertebrate Species Identification By:Tim KuzanAndy Osler Kelly Farrens Andy WhelchelMichelle Bryntesen
Outline ObjectivesMethods and MaterialsResultsDiscussion
ObjectivesDetermine if the lake is bottomlessDetermine the water content within the KB-Core samplesDetermine presence/absence of Macro-invertebrate species
MethodsDetermine if the lake is “Bottomless”2” PVC Pipe
MethodsUsing a KB-Core sampler we took 3 samples within the Lake (2” diameter, 20” length)ShorelineBetween shoreline and middle of LakeMiddle of Lake
MethodsEkman samples (15cm x 15 cm)Samples (3 at each section)ShorelineIn-between shoreline and middleMiddle of LakeSieved each sample 9 total samples were taken
Lab AnalysisCore samplesTop 10 cm (2cm intervals) Every 5cm after top 10cm were analyzed. 32 total samples over 3 coresWet weight Dry weight(60oC, 24hrs)Ash weight(550oC, 3hrs)Ekman SamplesUsed dissection microscope to identify species. All 9 samples were analyzed.
ResultsBottom was found approximately 6’ below the sediment water interface at the shoreline.
ResultsBlue= Organic weightRed= Mineral weight
Ekman samplesShoreline:An abundance of snail shells, clam shells, caddis fly casings Between shoreline and middle of lake:Few snail shells, few clam shells, chironomid larvae Middle of lake:chironomid larvae, dragonfly larvae, tubifex worms Results
DiscussionCauses for low macro-invertebrate populationsBull headsOxygen ConcentrationSediment had high organic matterAllochthonous Possibly indicates the lake age
ReferencesWetzel, R. G. 2001. Limnology - Lake and River Ecosystems (3 ed) Academic Press
Questions