Friday, October 22, 2010

Aquatic Ecosystems

I learned a lot from this video and article. It showed me a lot of things I can relate to from learning in class. I would describe the health of the aquatic ecosystems are not very good. Their habitat is being affected by density-independant factors like human impact. Also things like the greenhouse effect are affecting the population density as well. Some of the things that are happening in these ecosystems are that they are being warmed by sunlight and global warming which is causing fish to die. What happens is that the photic zone is heated, but then sunlight and heat is traveling lower which is affecting the fish population. Also we have been using the fish as a food source which is disrupting food chains and food webs which is also messing with some species trophic levels. We have lost quite a bit of our carnivours like sharks from our impact that it is affecting entire food webs. Humans have been making big impacts on these ecosystems too. We, as consumer, are overfishing and been eating too much fish. I think humans play a bigger role than they think in the biosphere. WE cause things like forrest fires that distroy biomes and other things that are based off human impact because we arn't being careful and using our resources wisely. We could be doing so many other things to be helping the biosphere that we are chooseing not to do. I honestly think people do not care about what they are doing to the biosphere. People have so many oppertunities to make a change and help save aquatic ecosystems by just picking up trash on a beach and throwing it away. This article and video really showed me what I could be doing to save the oceans so I am now going to try and be better!