Green Crabs Case Study

1.Summarize the information from the group visual

The visual contains the role and impact the inverse specie,Green Crab has on the ecosystem.The Green Crab is native to Europe but at time went by it spread to America,australia and is at risk of spreading all over the world. The spread of Green Crabs was most likely by natural dispersal in the oceanic currents,or by domestic dispersal mechanisms.Also Green Crabs can tolerate a wide range of environmental extremes such as cold temperatures, low salinities, etc ,which means controlling their population is very difficult. The invasion of green crabs has huge impact on the ecosystem as they are carnivore, who eat Oysters,clams and hundreds of other Species.This causes competitions for species that eat the same food as Green Crab and a huge population decline of these species that Green Crab consumes.Also Green Crabs are damaging eelgrass which is having a negative …show more content…
For example Green Crabs eat clams, other animals that eat claims such as fishes will be impacted negatively .As the populations of green crabs increase the claim decreases which causes polychaetes(eaten by clams) to increase, this than will cause zooplankton (eaten by polychaetes) to decrease.The whole food chain will be distributed and some species can be gone from that area. Another negative impact is that when Green Crabs damage eelgrass habitat by cutting the roots of the Eelgrass,while they are digging for prey in the sediment or making burrows.This a huge negative impact because Eelgrass has many valuable ecological functions such as stabilizing shorelines and sea floor ground,cleaning coastal waters, providing habitat for a diversity of flora and fauna, and supporting the foundation a food web.this means many species lose their home,protection and