by: tim kuzan andy osler kelly farrens andy whelchel michelle bryntesen
DESCRIPTION
Sedimentation and Macro-Invertebrate Species Identification. By: Tim Kuzan Andy Osler Kelly Farrens Andy Whelchel Michelle Bryntesen. Objectives Methods and Materials Results Discussion. Outline . Determine if the lake is bottomless Determine the water content within the - PowerPoint PPT PresentationTRANSCRIPT
Sedimentation and Macro-Invertebrate
Species IdentificationBY:TIM KUZANANDY OSLER KELLY FARRENS ANDY WHELCHELMICHELLE BRYNTESEN
OUTLINE Objectives Methods and Materials Results Discussion
OBJECTIVES Determine if the lake is bottomless
Determine the water content within the KB-Core samples
Determine presence/absence of Macro-invertebrate species
METHODS Determine if the
lake is “Bottomless”
2” PVC Pipe
METHODS
Using a KB-Core sampler we took 3 samples within the Lake (2” diameter, 20” length)
Shoreline
Between shoreline and middle of Lake
Middle of Lake
METHODSEkman samples (15cm x 15 cm) Samples (3 at each section)
Shoreline In-between shoreline and middle Middle of Lake
Sieved each sample 9 total samples were taken
LAB ANALYSIS Core samples
Top 10 cm (2cm intervals) Every 5cm after top 10cm were analyzed. 32 total samples over 3 cores
Wet weight Dry weight(60oC, 24hrs) Ash weight(550oC, 3hrs)
Ekman Samples Used dissection microscope to identify species. All 9 samples were analyzed.
RESULTS Bottom was found approximately 6’
below the sediment water interface at the shoreline.
RESULTS0 0.5 1 1.5 2 2.5 3 3.5 4
0
2
4
6
8
10
Shoreline
Weight (g)
Sam
ple
Blue= Organic weightRed= Mineral weight
0 0.2 0.4 0.6 0.8 1 1.20
2
4
6
8
10
12
Mid-Depth
Weight (g)
Sam
ple
0 0.2 0.4 0.6 0.8 1 1.2 1.402468
101214
Middle of Lake
Weight (g)
Sam
ple
Ekman samples Shoreline:
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
DISCUSSION
0 1 2 3 4 5 6 7 8 9 10 110
1
2
3
4
5
6
7
8
9
TemperatureD02
Temperature (Celsius) D02 (mg/l)
Dep
th (
met
ers)
Causes for low macro-invertebrate populations Bull heads Oxygen Concentration
Sediment had high organic matter Allochthonous Possibly indicates the
lake age
REFERENCES Wetzel, R. G. 2001. Limnology - Lake
and River Ecosystems (3 ed) Academic Press
QUESTIONS