Friday, September 14, 2012

Zonation

Today we discussed zonation in Marine Ecology. Zonation happens when organisms are adapted to a very specific set of conditions. Because some organisms are better adapted to these certain conditions, we see bands of organisms occupying zones. Today we talked about zonation and specifically how it affects the rocky coastline.


Students identified zones on rocky coast pictures and took notes on the material. Here is an example of a photo where the zones can clearly be seen by changes in dominant seaweeds. The yellow layer is the upper zone and the white pink is the middle zone. It is easy to see the high water mark or where the high tide will reach. You can also see the lichens in the spray zone.

 The spray zone is one of the hardest areas to live in because of the huge changes in salinity and temperature.


We also talked about tide pools. Tide pools are depressions that trap water when the tide recedes. You can find all kinds of things in tide pools, but tide pools in the lower zone have a higher biodiversity than tidepools found in the upper zone. This is because they are more often "refreshed" with water that keeps salinity, dissolved oxygen, and the temperature stable, as well as add nutrients and more food! Here is a neat article from National Geographic about tidepools (and where this photo is from). 
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Computer Lab Etiquette

You are in the computer lab to do work for this class. If you are not doing work, then we will have problems.

Do not pack up early. Work until the bell or until MsJ says.

SAVE OFTEN. And if you save to a key, also save it to your number. If you lose it, you will have to do it again.

If MsJ asks for your attention, stop what you are doing and listen to what she has to say.

You may watch videos about your organism through reliable websites.

You may listen to music through the computer if you have your own headphones. Rule1 MsJ cannot hear it. You get one warning. Rule2 Turn it on and listen – no million clicks and constant changing. Take both ear phones out when MsJ is talking.