Friday, September 30, 2011
When the sea otters are removed (like when they used to be hunted for their fur), the sea urchin populations go crazy, eat all the kelp (as in many many 300 foot tall plants), and the loss of kelp leads to a drop in biodiversity because there is less food and habitat for the many other species that like to live in and on and among the kelp.
Wednesday, September 28, 2011
Parrotfish are part of the nekton because they swim. They are omnivores because they eat coral (animal) and algae (plants). This fish is a male because it is more colorful than its female counterpart. Some may consider this warning coloration because it will chomp on things that try to mess with it. An odd part of their niche is that the coral they digest is where most of the white sand in tropical locations comes from.
Monday, September 26, 2011
Mutualism is the relationship that is best understood because both organisms benefit - although the advantages are not often clear to us. Pictured to the left are an alligator and plover, eel and cleaner shrimp, and zebra and finch - all of these are cleaning relationships. The smaller organism eats parasites and gets a meal and the larger organisms will not eat it as well as get the benefit of being cleaner (less infection and disease). The bottom right picture is a blind bulldozer shrimp and a goby fish. They share a dwelling that the shrimp builds, and the fish lets the shrimp know when trouble is coming. (Photos from this cool blog)
Parasitism involves things that give us the heebie jeebies. These parasites take advantage of their host, usually feeding on the host, and benefit. The host gets no benefits and over the long term is harmed.
Commensalism is when one organism benefits and the other is unaffected. So one gets all these advantages from the other... but the other doesn't get a benefit from it and isn't harmed by it.
Here are some other fun photos of oceanic relationships. Identify some and turn them in for extra credit!
Friday, September 23, 2011
Active camouflage is when an organism can actually change the color of its skin to match a background or flash colors to confuse predators and prey. Watch the Kings of Camoflage video about cuttlefish in the sidebar for more information.
The photo above is from this cool website blog that archives photos of all kinds of animals that are camouflaged.
We also talked about other types of coloration like mimicry, flash, warning coloration, advertising, and sexual dimorphism. Students finished the day by reviewing coloration and coloring their own fishes.
Wednesday, September 21, 2011
Monday, September 19, 2011
Students used scopes and made observations of sand samples from Hawaii, Grand Cayman, Normandy France, Lake Anna, Lake Superior, California, and Virginia Beach. Adrienne's mom brought us some sand from her recent trip to the Carribean - THANKS! Students determined what the sand was made of, where it came from, how old it was, if it was on an active beach, a windy beach - all kinds of information can be collected from a simple sample of sand!
The rest of class was spent working independently on the seafloor features surrounding the United States and reading and answering questions about underwater vehicles. Submarines are larger than submersibles and carry more people and can go longer distances. ROVs and AUVs are robots like remote-controlled cars, but go underwater. ROV's have a tether (cord) connecting them to power and AUVs do not.
Friday, September 16, 2011
Today in notes we covered sea floor features. We discussed the definitions and identified them on maps and then answered some questions. Test yourself - can you identify the features to the right?
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.