VII. DESERT FISHES
435
INCREASING DISTANCE FROM HEADWATERS
* -
Fig. 6. Linear dispersion of fishes in streams of various parts of the world, and
sketches of body forms of representative species found in various segments of
streams or stream systems. Note that factors other than stream gradient, such
as sizes, turbidity, or water chemistry, were correlated with these distributions by
some authors, and that this figure oversimplifies some patterns originally described.
Chubs of the genus Gila are most impressive, ranging from the thickbodied G. intermedia that lives in smaller, quieter habitats of the Gila
River basin, through G. robusta of intermediate-sized rivers and moderate
currents, to the exceedingly specialized G. elegans and G. cypha of the
mainstream Colorado River (Miller, 1946b; Cole, 1968; Rinne and
435
INCREASING DISTANCE FROM HEADWATERS
* -
Fig. 6. Linear dispersion of fishes in streams of various parts of the world, and
sketches of body forms of representative species found in various segments of
streams or stream systems. Note that factors other than stream gradient, such
as sizes, turbidity, or water chemistry, were correlated with these distributions by
some authors, and that this figure oversimplifies some patterns originally described.
Chubs of the genus Gila are most impressive, ranging from the thickbodied G. intermedia that lives in smaller, quieter habitats of the Gila
River basin, through G. robusta of intermediate-sized rivers and moderate
currents, to the exceedingly specialized G. elegans and G. cypha of the
mainstream Colorado River (Miller, 1946b; Cole, 1968; Rinne and