Spill the Sand on the App

Spill the Sand


In November of 2007, the container ship, Cosco Busan collided with a Bay Bridge assistance tower. The ship was fatally wounded, oozing 53, 569 gallons of oil into the bay area Bay. The aftermath of this incident may have accounted for a steep drop in sand crab population on San Francisco’s Ocean Beach in the many years to follow. The oil spill may have affected the number of enduring recruits, or young sand crabs, especially considering that the mating period for sand crabs occurs in spring and summer time, therefore influencing the amount of recruits in 2008.

Our Marine Biology course took part in the LiMPETS sandy coastline monitoring program on September twentieth, 2014 at Ocean seashore. To review the sand crabs residing in the coastline, we took 50 arbitrary examples of sand from swash area, or even the zone of wave activity. In every one of these 50 samples, we noticed any sand crabs that have been discovered. We recorded their gender and evaluated if they had been a recruit (young crab) or adult.

This piqued our curiosity about the way the popular Cosco Busan oil spill in 2007, which happened appropriate near in which we monitored the crabs, impacted the people and range recruits. We looked at the LiMPETS information twelve months after the spill to compare toward information we had gathered in September of 2014 to see how the percentage of recruits had changed.

Being compare numerous data, we analyzed information from surveys that were held in October 2008 (11 months after the spill) and September 2014. We looked over the full total few crabs and total number of recruits on Ocean Beach, and then we made a graph to compare the info. Based on the information and graph, the oil spill might have negatively affected the per cent of recruits. In October of 2008, the entire year after the oil spill, 15% of crabs had been recruits. In September of 2014, 27percent had been recruits. This data is restricted to the little sample size, and can possibly be broadened by taking a look at the whole year alternatively on only one month of each and every year. However, various other scientific tests are happening to help expand research the adverse effects of oil spills on crabs, especially the infamous BP oil spill.

Lastly, the sand crab populace varies a whole lot 12 months to-year despite alterations in real human influence or environment. But while just 15percent of the crabs had been recruits the October after the oil spill, that percentage nearly doubled 5 years later on. A potential explanation for the reduced portion of recruits during this period may be the more than oil regarding the coastline. Subsequently, 5 years later in September of 2014, an increased percentage of recruits could possibly be explained by the not enough oil in the coastline, suggesting an optimistic trend for the sand crab populace at Ocean Beach because recovers from the oil spill. This data, therefore, could be an indication of the sand crab population’s strength and capacity to overcome perhaps the stickiest of situations.

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