Sympatry and Syntopy of the Cricket Frogs Acris crepitans and Acris gryllus in Southeastern Virginia, USA and Decline of A. gryllus at the Northern Edge of its Range.

摘要

The three species of Acris (cricket frogs) have experienced widespread declines in the northern portions oftheir ranges in the eastern United States since the middle of the 20th Century. In A. blanchardi and A. crepitans, thesedeclines have been observed