crab Hemigrapsus sanguineus has spread to inhabit rocky intertidal locations along the

Atlantic coast from Massachusetts to North Carolina (McDermott 1998). Many reasons

have been proposed to explain the rapid spread of this non-indiginous species. For

example, it has been shown that H. sanguineus has longer spawning periods along the

mid-Atlantic coast than it does in its natural habitat in the western Pacific Ocean, due to

a more favorable climate (Epifanio et al 1998). For this reason, these crabs are able to

spawn more times per season than indigenous crabs, providing one possible hypothesis

For this species to expand its range along the Atlantic coast, it will need to have

wide tolerances to temperature and salinity. In 1998 Epifanio found that

The purpose of this study is to show the tolerance and behavioral responses of H.

sanguineus to varying water and air temperatures, and water salinity concentrations. It is

believed that these crabs will be very tolerant to the various extreme conditions that they

will be put through. It is the ability

bucket of 25 degree Celcius water. Five large and five small crabs ranging in size from

with the salinity refractometer, the water had a salinity of 40 parts per thousand. The

large Hemigrapsus sanguineus is substantially greater in water than it is in open air

water with a salinity of 15 parts per thousand, and then fell to 40% in water with a

statistically signifigant (Chi-square test, chi-square=9.942, p*0.05). The survival rate of

increased capacity to survive in water temperatures below 25 degrees Celcius and water

Some common words found in the essay are:
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Approximate Pages = 10 (250 words per page double spaced)