Where is the keystone species in this diagram? This was one of the questions which is needed to understand the importance of a food-web in any system. The importance lies within the fact that a keystone species is one which has a profound effect on its ecosystem relative to its own abundance. At first it was thought that Chlorophyta or zooplankton because without them, all the species feeding thereafter (secondary consumers, tertiary consumers, etc.) would be troubled because the preceding trophic level wasn't in any abundance. But were we wrong! In fact, a keystone species would be more like the tilapia because without it the other species would grow to an overabundance and outcompete the system. We actually used a maritime human food-web for this and used the whale as an example because without the whales everything else would grow to an extreme abundance and eat everything else.
Upon completion of this exercise and explanations about other key concepts about Sheryl's research project, we were introduced to the micro-sized organism catcher, which I call the "Plankton Catcher". After learning the purpose of this net and the various eye sizes of the different nets (the different sizes would vary to allow different sized organisms pass through the eye size or to be caught within the reservoir at the bottom), in groups we had to do some McGyver weights so that the nets would have a slightly negative buoyancy when drifting through the water.
And then the fun part came... The rigs were completed and now needed to be tested in the wonderfully cold and muddy water. When we were informed that we were all going to be getting wet today I wouldn't have made the decision I shall soon tell you about. Everyone was to split into groups of two, with a total of four groups. Two groups would be going on the surfboards in the middle of the pond collecting, one group would go on the boat with Sheryl to collect nearer to the dock, and one group would collect at the makaha. Because I thought we were all going to get wet, I decided to get the most grueling one out of the way from the get-go, so I decided to go in the pond on the surfboards... Little did I know because of time constraints we weren't going to switch! The tide was negative, the water extra muddy, and the wind fairly blowing, but despite this it had its moments. The beautiful Ko'olaus and the nice paddle workout I got while getting my net to collect some fine larval samples was priceless.
The fun part was finally here. After cleaning the nets to get any remaining organisms and sediment into the reservoir at the bottom we were finally able to look at some amazing microscope images at some of the samples we collected from the pond. In just 1 mL worth sample in a petrie dish we found so many different larval and other microorganism samples.
Life under the scope was interesting, for just a small section of data collection, so many different things were present. In my samples, we found more than 15 amphipods (top right), several copepods( one on left), and even small diatoms that looked like little hollow cylinders. In one of the groups they found a larval shrimp and crab (bottom right). This group even found something that even the higher-ups didn't even know was. I think it was the first ever leach found in Hawaii, which is great for all of us having to swim in the pond with the bloodsuckers. But for everyone's sake let's just say it was a larval platyhelminthes. The day concluded with this. It was probably the highlight of the first two weeks for me. Everything we learned and took part in was very fun but to see this whole different world under the scope was spectacular. It was like seeing something out of "Independence Day" with Will Smith, alien babies everywhere. It was an interesting second Tuesday, and made me excited for the rest of the days to come.
- Christian Dye
