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Measuring the mobility range of the Asian Shore crab

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Measuring the mobility range of the Asian Shore crab

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    1. Measuring the mobility range of the Asian Shore crab Lilia Ricci Ruben St.Fleur Kelly Vasquez

    2. Invasive Species Non-native plant or animal that is introduced into an area where it can cause economical or ecological damage.

    3. Characteristics of Invasive Species Ability to live off of a wide range of food types Reproduce rapidly Can stand varying temperatures and environments Highly mobile Have no natural predators in the invaded area.

    4. Hemigrapsus sanguineus The Asian shore crab is originally from the coast of Korea, China, Japan, and Russia Small species of crab that grows up to 45mm Range in color from dark brown to green

    5. Background First recorded citing in New Jersey in 1988. Thought to be introduced by ballast water, when emptied into the ocean. Co-live in intertidal and subtidal waters under rocks with native crabs. These crabs spawn between May and September Asian crabs are omnivores feeding on items such as bivalves and seaweed. Predators: Lobsters, other Asian shore crabs(when they are molting), Rockfish and Seagulls

    6. Hypothesis Lilia’s hypothesis: The Asian Shore Crab would travel more than 4 meters in a 24 hr period. Ruben’s hypothesis: The Asian shore crab would stay in the crabitat.

    7. Investigational Questions Percent of males and females Percent of crabs that are damaged Percent of female crabs that are gravid Distribution of the lengths Comparison of male and female carapace widths

    8. Methodology Day 1 Gathered materials and went out to St. Mary’s by the Sea, at low tide and collected 75 Asian Shore crabs Returned to lab and tagged crabs with red star. Placed them in a netted bag in the salt water aquarium over night.

    9. Methodology Day 2 We measured the carapace width of the crabs using slide calipers (mm) Check for damage; gravid, and gender Went to the beach and released the crabs into 3 crabitats; we place 25 per crabitats went to computer lab and entered data

    10. Methodology Day 3 Went to the beach a third time Recaptured tagged crabs within a 4 meter radius circle from the crabitats Measured crabs and tried to identify them with the data previously recorded

    11. Results

    12. Results 2

    13. Results 3

    14. Size Frequency Distribution (all crabs)

    17. Discussion Asian shore crabs are highly mobile (>4m in 24hr) in comparison to native crabs: Mithrax forceps: 0m (48hr) Libinia dubia: 1.25m (48hr) Panopeus herbstii: 1.6m (48hr)

    18. References Stachowsicz, J.J and M.hay 1999. Reduced mobility is associated with compensatory feeding and increased diet bread of the marine crabs. http://cars.er.usgs.gov/Nonindigenous_Species/Asian_shore_crab/asian_shore_crab.html http://dive.scubadiving.com/members/tripreports.php?s=2438 http://www.woodbridge.tased.edu.au/mdc/Species%20Register/crabs.htm http://149.168.1.196/nrid/getDataPub.php?sciName=Panopeus+herbstii&park=JORI

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