Microhabitat use by adult speckled dace (Rhinichthys
osculus), adult longnose dace (R. cataractae), and
juvenile dace (R. spp.) was investigated during the summer
of 1992 in an Oregon Cascades stream. Selected areas were
snorkeled day and night in order to evaluate differential
use of habitat resources both temporally and spatially.
Speckled dace were active both day and night but longnose
dace were only observed at night when they were found
primarily in fast flowing midstream areas. Small speckled
dace (<8 cm TL) shifted from relatively fast flowing
midstream daytime habitats to slower inshore areas at
night. Large speckled dace (8-14 cm TL) used slower areas
during the day and faster water at night. Potential
competition between large speckled dace and longnose dace
(8-20 cm TL) at night may be deflected by spatial
microhabitat segregation. Within the fast water habitat at
night, longnose dace used the fastest, shallowest areas
with large substrates and were usually on the bottom.
Large speckled dace used relatively slower, deeper water
with smaller substrates and were near, but not on, the
bottom. / Graduation date: 1994
| Identifer | oai:union.ndltd.org:ORGSU/oai:ir.library.oregonstate.edu:1957/36775 |
| Date | 09 June 1993 |
| Creators | Dodge, Karen L. |
| Contributors | Markle, Douglas F. |
| Source Sets | Oregon State University |
| Language | en_US |
| Detected Language | English |
| Type | Thesis/Dissertation |
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