Tidal exchange of decapod larvae and small benthic peracarids between the ocean and the Salmon River estuary, Oregon Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/s4655j928

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  • Zooplankton samples taken during daylight periods in a fast flushing estuary on the Central Oregon coast were analyzed for Brachyuran and Anomuran larvae and also for benthic gammaridean amphipods and Myscidacea. Several larval stages of Pinnixa littoralis, Hemigrapsus oregonensis, Pachycheles spp., Cancer oregonensis and Pagurus granosimanus were sufficiently abundant for quantitative analysis. Adults and juveniles of the amphipods Atylus tridens, Eogammarus confervicolus, Corophium brevis and the mysid Neomysis mercedis were present in both flood and ebb samples in numbers sufficient for analysis. All these species showed extensive tidal exchange. Larval stages of decapod crustaceans are exported from the estuary and an important input from the nearshore ocean also takes place. Larval recruits to the adult population of the Salmon River must include larvae flushed from other estuaries all along the coast. Adult benthic peracarid crustacean were abundant in samples taken at all tidal states indicating that their presence in the plankton is a normal occurrence. These benthic forms would not a priori be considered as extensively involved in tidal exchange, but according to our data they are. Tidal exchange of planktonic larvae and adults of small benthic species is clearly related to dispersal mechanisms of the species involved and contributes to maintaining the genetic variability of geographically separated populations.
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