Laserfiche WebLink
100 <br />80 <br />L <br />J2 60 <br />0 <br />40 <br />V <br />L <br />0. 20 <br />0 <br />Night <br />D Day <br />Bottom Middle Surface <br />Water Depth <br />Figure 1.2 Substrate selection by bonytail with and without red shiners present (low <br />flow), day and night combined. <br />Depth Selection in Substrate Experiments <br />In replicates with sand, course gravel, and sand/gravel, depth selection was not <br />independent of the time of observation (e.g. day versus night) as determined by a R x C <br />test (x2=22.16, df=1,_p<0.001). During the day bonytail were found near the bottom <br />93% of the time and at middle depths 7% of the time (Fig 1.3). During the night <br />observations bonytail were observed most often near the bottom (84%) but sometimes <br />at middle depths (16%; Fig 1.3). Bonytail were never observed near the surface during <br />day or night observations. <br />16