Survey of fishes, mammals and herpetofauna of the Colorado River in Grand Canyon
Citation
C R Shoop, G H Clemmer, and R D Suttkus, Survey of fishes, mammals and herpetofauna of the Colorado River in Grand Canyon: .
Summary
In a survey study conducted to obtain base-line data, eleven extensive float trips were made down the Colorado River in the period from September 1970 through mid-June 1976. Samples of fish, mammals, plants and herpetofauna were collected; species collected are listed. In addition, terrestrial surveys were made at various land sites in the region. Major results of this survey were the lack of success in obtaining a speciman of the humpback sucker, xyrauchen texanus, and the discovery of the relative scarcity of chubs of the genus Gila. Both of these outcomes have been tied to the low water temperatures caused by releases from the Grand Canyon Dam, as well as to the barrier that the dam presents to upstream movement to suitable spawning [...]
Summary
In a survey study conducted to obtain base-line data, eleven extensive float trips were made down the Colorado River in the period from September 1970 through mid-June 1976. Samples of fish, mammals, plants and herpetofauna were collected; species collected are listed. In addition, terrestrial surveys were made at various land sites in the region. Major results of this survey were the lack of success in obtaining a speciman of the humpback sucker, xyrauchen texanus, and the discovery of the relative scarcity of chubs of the genus Gila. Both of these outcomes have been tied to the low water temperatures caused by releases from the Grand Canyon Dam, as well as to the barrier that the dam presents to upstream movement to suitable spawning areas. (Payton-Arizona)
