 In southeastern Massachusetts , several samples of U. inflata have been gathered from Federal Pond beginning in 1990 , representing its first collection north of New Jersey on the east coast . Bruce Sorrie has identified a substantial population in this location . Sorrie indicated that human @-@ aided introduction of this species to Massachusetts is likely since Federal Pond has been used for various purposes since the late 18th century , though Sorrie also notes that transfer of propagules by waterfowl or herons from U. inflata 's native range may be just as likely . 
