Thursday, March 12, 2009
Question: How do diatoms differ from 50 cm to 70 cm?
Data: We did about 5 different slides at 50 cm and also at 70 cm. The diatoms differed between the two observations.
Claim: Both were the same size but they were shaped differently. The diatoms at 50 cm were shaped like bricks and the diatoms at 70 cm were shaped like ladders.
Evidence: There were more diatoms at 70 cm than 50 cm.
Reasoning: At 50 cm we didn't see many diatoms, but at 70 cm we saw more than 20 diatoms
1. Would've our results changed if we went deeper than 70 cm?
2. Would the moisture or dryness of the soil change the amount of diatoms?
Question: If we look at 2 different cores at the same depth would there the same kinds of diatoms.
Procedure: First we will clean off a slide, then take a small sample of core A at 20cm from the top. Then we will mix it with a drop of water and place a slide cover on top. We will then place it under a compound microscope and find as many diatoms as possible. We will then repeat these steps two more times. After recording our data we will take another slide sample, but this time from core B but still at 20Cm from the top. We will then look for more diatoms. Then we will repeat these steps 2 more times. After recording our data we will compare the types of diatoms we found.
Variable changed: cores
Variable measured: kinds of diatoms
Controls: Depth, amount of sediment
Slide 1: Anomoeoneis, Navicula/Pinnularia, Aulacoseira, Cymbella
Slide 2:Aulacoseira, Cyclotella, Hantzchia/Nitzschia, Surirella
Slide 3:Cyclotella, Navicula/Pinnularia, Aulacoseria
Conclusion: We conclude that there is a big difference in the 2 different cores. We came to the this conclusion because in the first core we saw many different types of diatoms, but when we looked at the next core we did not find any. We think this is a logical conclusion because there might have been more diatoms in one spot in none in the other
Friday, March 6, 2009
Our question:How many diatoms are there at 2cm than
Data:first day of the observations we found 1 diatoms under 2cm.
and under 10cm we found 3 diatoms.
the secound day of observations we found 2 diatoms under 2cm.
and under 10cm we found 3 diatoms.
the third day of observations we found 2 diatoms under 2 cm.
and under 10cm we found 2 diatoms.
conclusion: The concluison to our lake core sample is the more the
lake core sample goes in the ground the more diatoms appeat on the
slides , when we look at 2cm we found f diatoms over all and when we
did 10cm we found 8 diatoms over all.
further questions: 1) can we find more diatoms at 50cm than 10cm?
2)when you look at 10cm for diatoms and go 10cm down each time how
many ditaoms will you find
BY: Mark Hewitt and Justin Thomas
Variables change: depth
Variables measure: how many different diatoms
Controls: same core, same materials
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
Slide #1 at 10cm down
Slide #2 at 10cm down
Slide #3 at 10cm down
Slide #1 at 60cm down
Slide #2 at 60cm down
Slide #3 at 60cm down
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.
By: Becky, Brianna, Hunter, and Jason
Procedure:Take a sample of the lake core from 10cm. Make a smear slide by putting the dirt on and adding some water. Put the smear slide under a compound microscope and record what diatoms we see in our notebook. Repeat these same steps 2 times. Take a sample of the lake core from 90 cm. Make a smear slide by putting the dirt on and adding a few drops of water. Put the smear slide under a compound microscope and record what diatoms we see in our notebook. Repeat 2 times.
- compound microscope
- lake core
At 10 cm:
- 2 Fragilaria Capucina
- 2 Synedra
- 2 pieces of Gyrosigma
- 2 pieces of Asterionella Formosa
- 1 Navicula/Pinnularia
At 90 cm:
- 4 pieces of Asterionella Formosa
- 3 Fragilaria Capucina
- 7 synedra
- 2 pieces of Gyrosigma
Claim/Evidence: We found out that there are different kinds of diatoms at 90 cm and at 10cm. At 90 cm there were 4 pieces of Asterionella formosa, there were also 3 Fragilaria Capucina, 7 synedra and 2 pieces of Gyrosigma. At 10 cm we found 2 fragilaria capucina, 2 Synedra, 2 pieces of Gyrosigma, 2 pieces of Asterionella Formosa and 1 Navicula/Pinnularia.
Reasoning: Maybe we incorrectly evaluated which diatoms were what. Maybe one of those areas of time were drier so only certain kinds of diatoms were able to survive. It could have been wetter one year so there were different diatoms.
Further Questions: What different kinds of pollen are there at different depths? When the sediment is larger are there more or less diatoms?
Reasoning: The sediment that is deeper is older. Which gives more time to collect at the bottom.
Further question: how many more diotoms are at 20cm then 70cm
: what diatoms will you find the most
Thursday, March 5, 2009
Question: How many different kinds of diatoms are at 4cm and at 24cm?
1 take 2 samples one from 4 cm deep and one from 24 cm
2 put the samples on seprate glass slides
3 compare slides on a microscope
4 write down comparisins and differences between the diatoms on the slides
Variable Changed: Depth
Variables Measured: Number of Diatoms
Controls: Number of samples taken
With many slides at the correct depth of 4cm and 24cm our results were we did not find any diatoms at 4 cm at 24cm we found several cymbella and synedra for this maybe as the depth increases your diatoms may increase. Because they live on the bottom you will find more than the ones that float.