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Protocol of the lab from the 19.3.2007

material:
zinced-steel sheet (100cm x 10cm)
tape-
-yard-stick

two cups hot (60 ° C) and ice-water-some
fleacrabs
With these materials we build a . tempratureorgan





We build a bowl and divide it into six sections, each 10 cm.
Then we fill the bowl up with water 1 cm. On each site of the bowl we impute a cup, one with ice water and one with hot water. At last we put the fleacrabs in the bowl, watching what happens.

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Exercise 1 of the lab from the 19.3.2007: Discription of the fleacrabs

The crabs are:
- about 1cm long
- have a lot of legs
- have a fin at teire tail
- teire back is curved

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Exercise 2 of the lab of 19.3.2007

Look at the pictures in the post "Exercise 1 of the ptotocol from the 19.3.2007: Discription of the fleacrabs"

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Exercise 3 of the lab from the 19.3.2007: Locomotion of the fleacrabs

Fleacrabs have many little legs at theire front, keep them on moving. They have also a fin to direct their movement.

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Exercise 4 and 5 of the lab from 19.3.2007: Changing of the behaviour

After putting a leave into the bowl the fleacrabs hide under the leaves, because they are shy and like the darkness.

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Exercise 6 of the lab from the 19.3.2007



This diagram showes that the fleacras prefer cold water.

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Exercise 7 of the lab from 19.3.2007



This tabel showes how long one animal was in one section, one X stands for 5 seconds.

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Exercise 8 of the lab from 19.3.2007



The diagram showes where the crabs stay the longest time.
section 1:0-10cm (7,4°C)39%
section 2:10-20cm (15,2°C)21%
section 3:20-30cm (17.4 ° C) 18%
section 4:30-40cm (21 ° C) 17%
section 5:40-50cm (36.6 ° C) 5%
section 6:50 - 60cm (45.8 ° C) 0%

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Exercise 9 of the lab from the 19.3.2007

The result:
Fleacrabs like dark and cold places in the water.

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Praktikum vom 19.3.2007

materials:
-galvanized iron sheet (100cm to 10cm)
tape (width ca.2cm)
-meter rule
clamshell
-hot (about 60 ° C) and ice-water-
Some amphipods
With these materials we have now established a temperature-called organ.

First we have the sheet metal with hammer and pliers so bent that has emerged from a long long sheet about 3cm wide and 3cm high and 60cm long tub.
The sharp edges were then secured with tape.
The trough was divided lengthwise into sections about 10 cm long and filled with a 1cm layer of water.
The two shells, one with hot and the other with cold water, were placed at each end under the sink so the water surface of the shell touches the tank bottom. So the water was adopted in the tub on the individual shells, the respective temperature. So we had at one end of the bath hot and cold water at the other end.
were now placed the shrimp in the water and the Observation period started.
Most amphipods have been in the cold area (9 ° C - 15 ° C) found.

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Aufgabe 1 des Protokolls vom 19.3.2007: Description of the amphipods in words

The shrimp is a shrimp-like creatures great ca.1cm. It has a lot of legs and antennae, the abdomen is the body surface transparent and his back is curved. It has a small fin on the tail and dark eyes in the head.

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Task 3 of the placement of 19/03/2007: The locomotion of the freshwater shrimp

The amphipods have many small legs on the belly, that they forward treiben. Am Schwanzende befindet sich eine kleine Flosse, die zum Lenken dient.
Die Flohkrebse in unserem Behältnis konnten jedoch nur in Seitenlage schwimmen und das auch nicht sehr zielgerichtet, meistens schwamen sie recht planlos im Kreis.

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Task 2 of the placement of 19/03/2007

See picture in post "Task 1 Minutes of 03.19.2007: Description of the amphipods in words."

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Task 4 and 5 of the placement of 19/03/2007: changing the behavior of amphipods

Nach dem man ein Blatt in den Behälter gelegt hat, verstecken sich die Flohkrebse unter den Blättern. Daraus lässt sich schließen, dass Flohkrebse scheu sind und die Dunkelheit und Verstecke mögen.

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Task 6 of the internship from 19/03/2007




An diesem Diagramm kann man sehen, dass die Flohkrebse sich im kälterem Wasser wohler fühlen, da die Amphipods, if you have noticed that it gets warmer, have turned around and swam in the colder region.

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Task 7 of the placement of 19/03/2007




At this table we can see how long the shrimp stays in a particular area. An X stands for 5 seconds.
On the distribution of X's you can clearly see that the amphipods much rather stay in the cold (between 7.4 ° C and 15.2 ° C).

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Task 8 of the placement of 19/03/2007




clear if all values \u200b\u200bare added up per segment, that the shrimp feel the cold much better. They adhere to 39% in the segment 0-10cm (7.4 ° C) to 21% in the segment 10-20cm (15.2 ° C) to 18% in the segment 20-30cm (17.4 ° C) to 17% in the segment 30-40cm (21 ° C), 5% in the segment 40-50cm (36.6 ° C) and 0% of the time in the segment 50-60cm (45.8 ° C).

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Task 9 of the placement of 03/19/2007

All in all, one can say that amphipods feel comfortable in cold, dark waters, probably streams and rivers and lakes in forests, because they love each other as I said the dark and cold. It should have enough water in hiding (leaves, etc.) indicate, as the shrimp are very shy.

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Exercise 1: temperature - of the lab 26/02/2007

We have measured the temperature at three different locations in the aquarium.
There for we used a thermometer.
water surface: 19°C
middel of the aquarium: 18°c
ground of the aquarium: 17°C

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Exercise 2: pH - lab of the

We have measured the pH-value with an indicator, which we mixed up with the aquarium water, which becomes green. This colour we compared with a colour scala and found out that the pH is 8,5.
It would be ideal if the water have an ph-value of 6,5 to 7,5, so in our situation we should mix our water up with CO2.