Tuesday, August 5, 2008

Lovells Island - Periwinkles and Lands Snails Observation

Locations : Lovels Island in the Boston harbor

Methods : Observe periwinkles at the tidal pool, lands snails at the island.

Tools : Better prepared than the first time. Pen, pencil, a notepad, National Audubon guide book, and digital camera.

We first went to look for sea creatures at the tidal pool. Very rocky low tide pool had a great view that I enjoyed watching. I started searching by turning over the rocks at the shores but was not able to find any. While searching for periwinkles, we first found a crab with about 5cm x 2cm (width x height) in size that had a dark brown color. One thing I noticed was that it only had one claw. We flipped it over to see if there is anything distinguishing, but nothing that I was impressed was there.

We went into the tidal pool to look for periwinkles, and found many periwinkles with color variation. Dark-brown with average size of 1cm x 1cm is shown in the picture. Their color was similar to that of rock, and my first assumption was that it turns itself to a color similar to rock in a way to survive from their predators such as birds.

The next thing I found was tunacate that looked like Orange Sheath Tunacate. Claudia said there are not as many starfish, mussels, tunacate as last year. those might be the reason that there are rarely no sea gulls in islands because there are less for them to eat.

There was also a sea quirt that was hidden in seaweeds and tunacates. It was size about .5cm x .4cm , since it was so small, it is hard to visualize from the picture that I took.

I felt that the tide was starting to rise while I was in the water. We moved to the inland to find out lands snails. We broke into 4 groups, and started look for lands snails that live in Sumek tree. We as a class, came up with more than 100 dead shells and about 50 land snails.

We gathered around and started to sort land snails based on many different assumptions to find out how many species are they. Experiment of sorting was based on color, shape of opening, number of bands, direction of spiral and etc. The color and band variations were most distinguishing, and my assumption was that the diference in color and number of bands might not decide the difference in species. Many in the class guessed that there is one specie, but it is hard to come up with an answer with such a limited data.

Overall : Though littl too long, it was amazing experience and I am looking forward to watch whales

1 comment:

Juwon (Steve) Yang said...

excuse me for have descriptions that seem to be too brief. I was running out of time.