| a forty-three year museum study of northern cricket frog (acris crepitans) abnormalities in arkansas: upward trends and distributions. | the northern cricket frog (acris crepitans) is a resident of streams, rivers, and wetlands of eastern north america. we documented abnormalities in a. crepitans housed in the arkansas state university museum of zoology herpetology collection. abnormality frequency increased from 1957 to 2000 (chi 2 = 43.76, df = 3, p < 0.001). from 1957 through 1979 only 3.33% of specimens were unusual. this rate was 6.87% during the 1990s, and in 2000 it was 8.48%. high frequencies of abnormalities were identif ... | 2003 | 14567212 |