Analysis of the lower distributional limit of callianassid shrimp in South Slough National Estuarine Research Reserve
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Date
1993
Authors
Miner, Jonathan Neal, 1969-
Journal Title
Journal ISSN
Volume Title
Publisher
Thesis (M.S.)--University of Oregon, 1993.
Abstract
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.
Description
Typescript.
Includes vita and abstract.
Bibliography: Includes bibliographical references (leaves 77-80).
Description: xii, 80 leaves : ill. ; 29 cm.
Keywords
Ghost shrimps -- Oregon -- South Slough National Estuarine Research Reserve -- Geographical distribution, Estuarine ecology -- Oregon -- South Slough National Estuarine Research Reserve, Estuarine animals -- Oregon -- South Slough National Estuarine Research Reserve -- Geographical distribution, South Slough National Estuarine Research Reserve (Or.)
Citation
Miner, Jonathan Neal. Analysis of the Lower Distributional Limit of Callianassid Shrimp in South Slough National Estuarine Research Reserve. Thesis (M.S.)--University of Oregon, 1993, 1993.