| biodiversity threats from outside to inside: effects of alien grey squirrel (sciurus carolinensis) on helminth community of native red squirrel (sciurus vulgaris). | biological invasions are among the major causes of biodiversity loss worldwide, and parasites carried or acquired by invaders may represent an added threat to native species. we compared gastrointestinal helminth communities of native eurasian red squirrels (sciurus vulgaris) in the presence and absence of introduced eastern grey squirrels (sciurus carolinensis) to detect alterations induced by the alien species. in particular, we investigated whether spillover of a north american nematode stron ... | 2015 | 25877391 |