Hemigrapsus sanguineus in Long Island salt marshes: experimental evaluation of the interactions between an invasive crab and resident ecosystem engineers

摘要: The invasive Asian shore crab, Hemigrapsus sanguineus, has recently been observed occupying salt marshes, a novel environment for this crab species. As it invades new habitat, is likely to interact with number of important marsh To understand the potential effects H. sanguineus on ecosystem, interactions between and ecosystem engineers were examined. Laboratory experiments demonstrated competition burrows native fiddler Uca pugilator. Results indicate that able displace an established from its burrow. Feeding revealed presence significantly negative impact as well biomass ribbed mussels (Geukensia demissa) consumed by green Carcinus maenas, although only occurred at high predator densities. In addition, when both crabs foraged together, there was significant shift in size consumed. These suggests may have long-term impacts wide-ranging saltmarsh ecosystem.