mackenzie, shelby, and alex

Question: How many different diatoms are there at 10 cm down and 60cm down?

Variables change: depth
Variables measure: how many different diatoms
Controls: same core, same materials

Materials:
lake core
compoud scope
tooth picks
dropper
slide
slip cover
note book

Procedure:
1 clean slide
2 get sample from 10cm down and put on slide
3 put water on and spread
4 examine under a compound scope
5 repeat #1 and get a sample from 60cm down
6 repeat #3 and #4
7 record data in note book
8 when finished, clean slide and put stuff away

Data:
Slide #1 at 10cm down
synedra-2
asterionella tormosa-1
melosiera-4
Slide #2 at 10cm down
melosiera-2
amphora-1
synedra-1
Slide #3 at 10cm down
planothidium/achnanthes-2
melosiera-4
synedra-2
cyclotella-1
Slide #1 at 60cm down
rhopalodia-1
melosiera-4
Slide #2 at 60cm down
amphora-3
melosiera-7
synedra-1
epithemia-1
gyrosigma-2
navicula-pinnularia-9
Slide #3 at 60cm down
melosiera-3
fragilaria capucina-3
cyclotella-2

Conclusion:
claim-at 10cm down we found 6 different kinds of diatoms and at 60cm down we found 9 different kinds of diatoms.
evidence-we made three slides from each depth and examined them from under the compound scope. of all the slides we took from 10 cm down we found five synedra, one asterionella formosa, ten melosiera, one amphora, one cyclotella, and one planothidium/achnanthes. of all the slides at 60cm down we found one epithemia, nine navicula/pinnularia, two cyclotella,14 melosiera, two gyrosigma, one rhopalodia, one synedra, three amphora, and three fragilaria capucina.
reason-we think there are more at 60cm down because it's older and maybe there were more diatoms at that time. it may have been at the end of the drought period so maybe the habitat would have been different. and we have a lot of benthic and they hangout towards the bottom of the lake. we believe that this was also before lake adley became polluted.