Effects of bark debris on benthic macro-fauna of Yaquina Bay, Oregon Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/gb19f908t

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  • Benthic samples were collected during the summer, winter and spring seasons from upper Yaquina Estuary, a region used by Georgia- Pacific Corporation for log dumping and storage. Samples came from an active log dump and storage areas as well as areas not associated with log handling activity. The samples were analyzed for total macrofauna (>1. 0 mm) and sediment parameters. One of the sediment parameters measured was total organic or volatile solids which was used as an indicator of bark deposits. Diversity indices were calculated on total macrofauna collected during the three sampling periods and on the polychaete and crustacean subgroups. A similarity index was also calculated for all combinations of summer sampling stations. Multiple regression analysis of diversity with seven sediment parameters and water depth was generally insignificant. The trends in total summer macrofauna and crustacean diversities showed an increase in diversity with increasing volatile solids. A similar increase was noted in the summer macrofauna density. Winter and spring macrobenthic diversities were not significantly correlated to any of the parameters measured. Although population densities generally declined during these two seasons there was a positive correlation of density with water depth. This indicates that organisms associated with the more saline bottom waters were protected from severe osmotic stresses caused by the overlying river water. The results of the summer similarity analysis showed four groups of highly similar stations. Two groups were in fairly coarse sandy sediment, while the other two were in finer sand and silt sediments, One group of the latter two was associated exclusively with the log handling areas. The results indicate that bark debris in Yaquina Estuary did not result in decreased diversity or density of macrofauna but seem to result somewhat in an altered species type. Possible explanations for these results are discussed.
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