Typescript.
Includes vita and abstract.
Bibliography: Includes bibliographical references (leaves 77-80).
Description: xii, 80 leaves : ill. ; 29 cm. / The lower distributional limits (fronts) of
callianassid shrimp populations were observed at five sites
in South Slough, Coos Bay estuary, Oregon. Fronts at four
sites exhibited similar shoreward-seaward movements while
the remaining site showed drastic population reductions.
Shrimp density and body size were found to be significantly
greater above than below the front. There was no consistent
pattern found in grain size or interstitial water content
across the front.
In a controlled predator-exclusion experiment,
resulting shrimp densities were not significantly different
among treatments. Front shifts showed no pattern in response
to treatments. These results imply that fish predation is
not responsible for front placement. Trawls taken on both
sides of the front produced similar densities of a predatory
fish, Leptocottus armatus. Because predation pressure was calculated to be roughly equal above and below the front,
Leptocottus is not expected to be responsible for position
and movements of these fronts.
| Identifer | oai:union.ndltd.org:uoregon.edu/oai:scholarsbank.uoregon.edu:1794/9934 |
| Date | January 1993 |
| Creators | Miner, Jonathan Neal, 1969- |
| Publisher | Thesis (M.S.)--University of Oregon, 1993. |
| Source Sets | University of Oregon |
| Language | en_US |
| Detected Language | English |
| Type | Thesis |
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