Data of number of barnacles!!

Here is the Data Zahida and Zijian collected from the spot near the Spiritual Centre .

At 12:00 in the morning (lowest tide).

Temp= 11.4 vs 11.0 (@ 2am) Celsius Degrees

Height (meters below standard)	data 1	data 2	average data
0.3	258	250	254
0.5	160	160	160
0.7	21	15	18
0.95	115	116	115.5
1.3	89	93	91

The graph is then drawn below, the y-axis represents the

number of barnacles at different heights (the x-axis)

We have to conclude, this data is a mess~~

Whether we have any explanations about that...we are going to talk about it...

Evaluation

Uncertainties/ evaluation:
Throughout our experiment we encountered many challenges that highly affected the accuracy of our data. Some of these are:
1) We were not able to collect our samples from the two places at the same time
2) We possibly counted some things that were not barnicles
3) In order to count the barnicles, we split up into two groups. Each group used a different method for counting the barnicles
4) Measuring devices might not have been accurate, because the rock faces were not smooth
5) Moving boats made the water very muddy. Thus, it might have affected our salinity measuremnt
6) The rough surface made hard sometimes hard to measure

Improvements:
To improve our data what we could have done was:
1) We could have timed the data collection better.
2) We could have agreed on what kind of barnicles to count and what kinds not to count (dead, alive...etc)
3) Before splitting into 2 groups, we could have agreed on a common method to use
4) We could have picked better spots, where the rock surface is smoother

Salinity...

We measured our salinity after collecting the other data.

Salinity of the sample from Spiritual Centre Spot.

High Tide Salinity : 3.00%
Low Tide Salinity: 2.51%

Salinity of the sample from Maintenance Spot.

High Tide Salinity: 2.43%
Low Tide Salinity: 3.03%

This is interesting...since the change of salinity is inverse!! We will try to find out what happened...

Data collection @ maintenance

At 11:44 (lowest tide=0.6m), we counted the number of barnicles on a rock face that was not completely verticle. Therefore, we counted in a line from the surface of the water at low tide to the surface of the water at high tide. We used 10 10x10 transicts. The total area measured was 2900 centimetres squared.
The data was as follows:
Transect1- 70-75
Transect2- 156-160
Transect3- 180-185
Transect4- 67-72
Transect5- 70
Transect6- 249
Transect7- 150
Transect8- 289
Transect9- 70
Transect10-30
Total number of transicts= 1340 (+/- 13)
Temperature of water= 11.8 vs 11.2-11.4 (at 2 am) Celsius degrees

Second data from Spiritual Centre Spot

This morning at 11 30 am, we divided ourselves into 2 groups. Zahida and me collected data from the spiritual centre spot, while Yuri and Ghazi did that on the other spot.

I used classical triangle method to measeure that the tide change (relative to the standard we set yesterday) was -1.8 metres. Therefore the calculated tide height is 2.3 - 1.8 = 0.5 m, this matches our predicted tide height, which should be 0.4 to 0.5 metre.

The temperature is 11.3 /11.4 ºC.

Then we measured the numbers of barnacles in each square (10 inches · 10 inches) of area.

The data of barnacles will be posted later in form of excel.

Zijian and Zahida.

First Stage of Research

Our collected data:

Spot 1: (Near Spiritual Center)

11:30pm April 16th 2010: Put a rock at the level of the water/tide (from tide chart expected to be 2.3m) in order to measure by how much the tide rose when it became its predicted highest, thus confirming or disproving the tide charts.

2:00am April 17th: Tide change: 33cm higher than what it was at 11:30 (2.3m) and the expected tide is 2.6m, which is the high tide. Therefor the the data on the chart seems very accurate.
Temperature: 10.9~11 Celsius degrees.

Spot 2: (Near Maintenance Docks)

11:59pm April 16th 2010: Put a rock at the level of the water/tide (from tide chart expected to be 2.4m) in order to measure by how much the tide rose when it became its predicted highest, thus confirming or disproving the tide charts.

2.30am 17th April 2010:Tide change: 34cm higher than what it was at 11:59 (2,4m), and the expected tide was 2.6m, which is the high tide. Therefore the the data on the chart seems slightly inaccurate.
Temperature: 11.2~11.4 Celsius degrees!!

Evaluation

Temperature is rather constant only fluctuating by about 0.3 of degree with the farther into the Pedder Bay spot being warmer, possibly due to the shallowness which allows the sun to warm up more water and the rock beneath.

As for tide change, the chart is mostely accurate and the margin of error could be due to us. The nature of our location, tools and the fact it was dark all help distort the data.

For today we wait!!!!Low tide!

Ghazi, Zijian, Zahida, Yuri!!!

So...We chose the two spots where we're going to take our samples....

We left marked rocks near the seawater surface in order to collect data at exactly the same place again.

The next step now is to actually collect the 2 samples. All we're waiting for now is the high/low tide.

Zijian/Ghazi