1 / 14

Asian Shore Crab and European Green Crab Habitat

Asian Shore Crab and European Green Crab Habitat. Amy Darbyshire | Conor Clifford | Quinn Coughlin | Stephanos Mitrokostas | Augusta Davis. Hemigrapsus sanguineus. Carcinus maenas.

tamyra
Télécharger la présentation

Asian Shore Crab and European Green Crab Habitat

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Asian Shore Crab and European Green Crab Habitat Amy Darbyshire | Conor Clifford | Quinn Coughlin | Stephanos Mitrokostas | Augusta Davis

  2. Hemigrapsus sanguineus Carcinus maenas Asian Shore Crab (Hemigrapsus sanguineus) on the left and European Green Crab (Carcinus maenas) on the right.

  3. Question and Hypothesis Research Question: “How do the hydrophysical properties of the Sandwich Town Beach Estuary affect the distribution of Hemigrapsus sanguineus and Carcinus maenas?” Hypothesis: Based off of some prior research -- and consultation with Dr. Pete -- we suspect that the Asian Shore Crab (H. sanguineus) will be more common in the turbulent and cooler outer beach waters rather than in the estuary, whereas the European Green Crab (C. maenas) will likely be found in calmer estuary waters, but not necessarily in warmer ones.

  4. Materials and Method Materials: • 2 nets and 2 pails (to catch and contain crabs) • ham (bait) • 3 pieces of string, 2 one meter long and 1 five meter long (one to assist in measuring the quadrats, one to tie the bait, and the third to tie the water bottle to measure current speed) • an empty water bottle • 2 poles (to measure out quadrats) • 2 pairs of waders • iPhone (for taking pictures, stopwatch and a gps)

  5. Materials and Method Methods: Catching the crabs: • Tie a pole to each end of the one meter long piece of string and place the poles in the water so the string is stretched out, measuring one meter and record GPS coordinates of the quadrat. • Tie the bait to the other meter long piece of string and place it in the water. • Use the nets to catch the crabs as they attack the bait. • Fill the two pails with water and keep the Asian Shore crabs (H. sanguineus) in one bucket and the European Green crabs (C. maenas) in the other.

  6. Materials and Method Methods: Current Speed: • Tie the five meter long string to the water bottle and release it into the water. • Use a stopwatch to time how long it takes to travel the five meters. • Divide five meters by the amount of seconds it took the bottle to travel five meters to find current speed. Temperature • Place thermometer in water at the different sites and record temperature in oC. • We used 2 different thermometers to record an accurate temperature

  7. Raw Data Temperature, Current Speed and Number of Shore Crabs at Sandwich Beach Estuary

  8. Processed Data

  9. Processed Data (cont.)

  10. Conclusion The number of crabs that live in a certain area is affected by current speed and water temperature. As our data shows, the faster the current and the colder the water, the less likely crabs will live in an area. It is also apparent that C. Maenas (European Green Crabs) are far more common than H. sanguineus (Asian Shore Crabs). While C. maenas Crabs were more common, H. sanguineus Crabs were found in colder water with faster current speeds than the water where C. maenas Crabs were found though to little data of H. sanguineus Crabs was collected to draw a complete conclusion of the habitat of the H. sanguineus. In conclusion, C. maenas are very common and tend to live in warmer water (around 17 degrees celsius), and with slower current speeds (below 0.45 meters per second).

  11. Evaluation

  12. Pictures!

  13. Online Images Bibliography "Hemigrapsus Sanguineus." Wikipedia. Wikimedia Foundation, 10 June 2013. Web. 15 Oct. 2013. Bortolus, Alejandro. "Carcinus Maenas | The Exotics Guide." The Exotics Guide. N.p., n.d. Web. 15 Oct. 2013.

More Related