Thursday, July 31, 2014
The Common Periwinkle Littorina littorea, is a small marine snail that can be found along the East Coast from Nova Scotia to Maryland. The L. littorea originated in Europe but was introduced to the East Coast in the 1800’s and are thought to have made the journey from Western Europe attached to rocks used as ballast in ships coming across the Atlantic. Periwinkles have a stout spiral shell, usually in various shades of gray and can grow up to around 1.5 inches. Periwinkles can be found along the shore on rocks or some muddy bottoms, making them an easy target for shore birds which are their primary predator.
The Editors of Encyclopædia Britannica. "Periwinkle." Encyclopedia Britannica Online. Encyclopedia Britannica, n.d. Web. 30 July 2014.
"Periwinkle." Eat The Invaders RSS. N.p., 28 June 2012. Web. 30 July 2014.
Benson, Amy. "Asian Shore Crab." Asian Shore Crab. U.S. Geological Survey, 11 July 2013. Web. 30 July 2014.
"Barnacle (crustacean)." Encyclopedia Britannica Online. Encyclopedia Britannica, 10 Mar. 2014. Web. 30 July 2014.
"Issg Database: Ecology of Elminius Modestus." Issg Database: Ecology of Elminius Modestus. Global Invasive Species Database, 8 June 2010. Web. 30 July 2014.
Hermit Crabs have no shell of their own, but rather use the empty shells of other crustaceans such as the periwinkle, and must transfer to larger shells as they grow. The availability of empty shells can create competition amongst the hermit crabs.
Encyclopædia Britannica. "Hermit Crab (crustacean)."Encyclopedia Britannica Online. Encyclopedia Britannica, n.d. Web. 30 July 2014
Saturday, July 26, 2014
I also found many tiny crabs in the tidal pool. It is about 0.9 inch wide without legs. Its back is dark green, they walk sideways. There are thick strips on the legs with spots. The body of the crab is square shape. I think these little guys are Asian shore crabs (Hemigrapsus sanguineus). They have "bended legs, red sports on claws." It has different colors as I saw at the same tidal pool.
Friday, July 25, 2014
The day started with a trip to Lovells Island but stop mid way to take advantage of the good fishing spot. Our quarry was a massive striper, two flounder, and x.
After fishing we went to the island and studies the shoreline where we found tide pools with beautiful rocks, small crabs, and a lot of barnacle. Remnants of old military installations dotted the island but nature over came it.
Afterwards we found evidence of land snails on a rock that led me to believe birds smashed them. I also think that other campers might have brought adventurous snails with them in their gear.
First came the Silver Hake, a very elegant fish that is also called a whiting. While I am not the best at drawing I think I did a good job on drawing this fish as you can see in my notes below ..especially on those clear fins on the underside of the fish.