Description

The data come from a graduate student, Rich Brown, working in the biotelemetric unit in the Department of Biology at the University of Waterloo. He is interested in examining habitat usage versus habitat availability of a particular species of fish, cutthroat trout.
 

Habitat Usage
 

Rich implanted radio transmitters in 27 trout in Dutch Creek, Alberta. The fish were initially caught (by angling) from upper, middle and lower parts of the creek. (You might assume that these captured fish represent a random sample from the population of cutthroat trout in those particular sections of the creek.) Each fish was radio-tagged and then returned to the creek at the location of capture. Twenty-three trout were tagged at the end of August or the beginning of September and then each trout was relocated every third day starting September 1, 1995 until disappearance or January 12, 1996. Four additional fish were tagged in mid-November, 1995 and then relocated every three days until January 12, 1996.
 

The particular kilometer along the stream that the fish was in when relocated and the depth (cm.) at which it was then swimming were recorded. As well, the distance (m.) moved from the previous location, either upstream (positive distance) or downstream (negative distance), was recorded. 
 

Below is a table indicating the particular kilometers of the creek that each fish was found to be swimming in when relocated over the period of the study.
 

Kilometers used by each fish in the fall and winter

* no data on availability recorded

Habitat Availability
 

Since habitat conditions changed with the presence of ice, the depths available to the fish were measured in the fall (not at all or once) and in the winter (not at all, once or twice). The available depths were measured in each kilometer along the creek using 20 equi-spaced transects (straight lines) per kilometer. (The particular kilometers surveyed for availability are labelled 4, 6, 7, 9, 12, 14, 15, 18, 19, 20, 21 and 22. The other kilometers were not surveyed.) The transects were run perpendicular to the stream starting from the wetted edge. The depth (cm.) was measured at meter intervals along the transect, although individual transects are not identified in the data set.