Journal article
Plankton Assemblage Variability in a River-Dominated Temperate Estuary During Late Spring (High-flow) and Late Summer (Low-flow) Periods
Estuaries and coasts, Vol.38(1), pp.93-103
01/2015
Handle:
https://hdl.handle.net/2376/117517
Abstract
Seasonally variable freshwater flows are known to influence estuarine plankton assemblages. There has been little recent study of the plankton dynamics of the Columbia River Estuary (CRE), a large, river-dominated estuary that has experienced great modification to its hydrological cycle. Zooplankton (>75 μm) were collected during four late spring (high-flow) cruises and three late summer (low-flow) cruises in 2005 and 2006. Surface-water microplankton (5–200 μm) were collected during cruises in 2005. Zooplankton and phytoplankton assemblage composition varied along an axial salinity gradient and between flow periods. Estuarine zooplankton were strongly seasonal and dominated by the calanoid copepod Eurytemora affinis in the late spring, high-flow period and by the invasive calanoid Pseudodiaptomus forbesi in the late summer, low-flow period. The phytoplankton assemblage was dominated by freshwater diatoms, primarily Aulacoseira spp. The ciliate Mesodinium rubrum (=Myrionecta rubra) reached high densities during the low-flow period, but otherwise, distinct high-flow and low-flow phytoplankton assemblages were not detected. Comparison to prior studies in the CRE suggests that the plankton assemblage composition during the low-flow period has undergone considerable change, which may in turn have important trophic implications.
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Details
- Title
- Plankton Assemblage Variability in a River-Dominated Temperate Estuary During Late Spring (High-flow) and Late Summer (Low-flow) Periods
- Creators
- J Breckenridge - Department of Earth, Ocean and Atmospheric Science University of British Columbia 2020-2207 Main Mall Vancouver BC V6T 1Z4 CanadaS Bollens - School of the Environment Washington State University 14204 NE Salmon Creek Avenue Vancouver WA 98686 USAG Rollwagen-Bollens - School of the Environment Washington State University 14204 NE Salmon Creek Avenue Vancouver WA 98686 USAG Roegner - NOAA Fisheries, Northwest Fisheries Science Center Point Adams Research Station Box 155 Hammond OR 97121 USA
- Publication Details
- Estuaries and coasts, Vol.38(1), pp.93-103
- Academic Unit
- Environment, School of the (CAS)
- Publisher
- Springer US; Boston
- Identifiers
- 99900548566801842
- Language
- English
- Resource Type
- Journal article