Methods:

C. maenas and H.sanguineus were found mostly in little pools of water and/or under rocks. Since it is difficult to find a standardized method of finding them in small sediment, these other areas were not searched. The high intertidal area was not used because of lack of time and sunlight.

                                                                                                                                        Figure 1: The width and length were measured for each crab using a digital caliber 

I looked in small pools of water and moved rocks to find most of these crabs. Each one was collected into a bucket and the width and length of the carapace were measured by a digital caliber(see figure 1).  Body size was calculated by multiplying these two measurements. If the specimen was too small, it was set aside since the identification of the species would not be accurate (figure 2). The place where each crab was found was defined as low or mid-intertidal. Each crab was placed back to its original location.

Each crab was identified as either C.maenas or H.sanguineus. The C.maenas is found to have a green or green-gray color with a slightly wider carapace than length. The H.sanguineus has a darker color, brownish orange, and a squarer carapace. Its legs also have band marks on them. Mostly the different colors and the bands were used to differentiate the two species.

Figure 2: small crabs were placed aside (like the crab on the left) since the identification would not be accurate.