Sedimentation and Macro-Invertebrate Species Identification

kayakjokeMechanics

Feb 22, 2014 (3 years and 5 months ago)

76 views

BY:

TIM
KUZAN

ANDY OSLER


KELLY
FARRENS


ANDY
WHELCHEL

MICHELLE
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

METHODS

Ekman

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(60
o
C, 24hrs)


Ash weight(550
o
C, 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.


RESULTS

0
2
4
6
8
10
0
0.5
1
1.5
2
2.5
3
3.5
4
Sample

Weight (g)

Shoreline

Blue= Organic weight

Red= Mineral weight


0
2
4
6
8
10
12
0
0.2
0.4
0.6
0.8
1
1.2
Sample

Weight (g)

Mid
-
Depth

0
2
4
6
8
10
12
14
0
0.5
1
1.5
Sample

Weight (g)

Middle of Lake

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
0
1
2
3
4
5
6
7
8
9
10
11
Depth (meters)

Temperature (Celsius) D02 (mg/l)

Temperature
D02

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