experiment design

Debate and discussion of any biological questions not pertaining to a particular topic.

Moderators: Leonid, amiradm, BioTeam

Post Reply
martyn
Garter
Garter
Posts: 11
Joined: Mon Apr 09, 2007 10:31 am

experiment design

Post by martyn » Fri Sep 28, 2007 10:49 am

HI everyone i need some help. we have to design an experiment to examine the following:

do goldfish prefer to attack groups of daphnia or individuals.

we are provided with 5 fish, 5 plastic tanks, tank dividers, boiling tubes, a sieve, stop watchers and pipettes.

how can we set the experiment out do any of you have any good ideas ?

Thank you.

Darby
Viper
Viper
Posts: 1278
Joined: Thu Mar 02, 2006 5:29 pm
Location: New York, USA

Post by Darby » Sun Sep 30, 2007 3:05 am

First, it's obvious that the instructor has a design in their head. Think about what you can do with those particular materials.

martyn
Garter
Garter
Posts: 11
Joined: Mon Apr 09, 2007 10:31 am

Post by martyn » Sun Sep 30, 2007 8:43 am

I was thinking dividing each tank with the fish on one side and a load of daphnia on the other and timing how long it takes for an attack but im not sure how to represent the results and anylize then them statisticly anyone have any advice

User avatar
mith
Inland Taipan
Inland Taipan
Posts: 5345
Joined: Thu Jan 20, 2005 8:14 pm
Location: Nashville, TN
Contact:

Post by mith » Sun Sep 30, 2007 2:22 pm

Here's one way, have your daphnia already in the tank, then dump in one goldfish. Record time between dumping and time for goldfish to approach it. Then repeat for dumping a group.
Living one day at a time;
Enjoying one moment at a time;
Accepting hardships as the pathway to peace;
~Niebuhr

martyn
Garter
Garter
Posts: 11
Joined: Mon Apr 09, 2007 10:31 am

Post by martyn » Sun Sep 30, 2007 5:25 pm

Thanks mate , How would i show my results i am nor sure how to design the graph what should go on the axis etc ? How can i statistly anylize the results ?

User avatar
mith
Inland Taipan
Inland Taipan
Posts: 5345
Joined: Thu Jan 20, 2005 8:14 pm
Location: Nashville, TN
Contact:

Post by mith » Sun Sep 30, 2007 5:45 pm

Well, the x-axis is the independent, so what are you actively changing in the trials?

the dependent is your measurement of how likely the goldfish is to attack the prey.
Living one day at a time;
Enjoying one moment at a time;
Accepting hardships as the pathway to peace;
~Niebuhr

martyn
Garter
Garter
Posts: 11
Joined: Mon Apr 09, 2007 10:31 am

Post by martyn » Sun Sep 30, 2007 9:06 pm

I was thinking maybe putting daphnia into the tank then adding the fish and recording when ever the fish ate the daphnia and adding water fleas as they were consumed and end the trail when th fish stops eating will that be good ? how would i put that into a graph though ?

User avatar
mith
Inland Taipan
Inland Taipan
Posts: 5345
Joined: Thu Jan 20, 2005 8:14 pm
Location: Nashville, TN
Contact:

Post by mith » Mon Oct 01, 2007 12:49 am

Well, note that the ultimate goal is to measure the tendency to attack groups or individuals. Make sure you know how to explain your results in those terms.
Living one day at a time;
Enjoying one moment at a time;
Accepting hardships as the pathway to peace;
~Niebuhr

Post Reply

Who is online

Users browsing this forum: No registered users and 4 guests