Abstract Nonmetric multidimensional scaling (NMDS) is a powerful statistical tool which enables complex multivariate data sets to be visualized in reduced number of dimensions. Users typically evaluate the fit an NMDS ordination via “stress” (i.e., distortion) against commonly accepted set heuristic guidelines. However, these guidelines do not account for mathematical relationship links stress sample size. Consequently, researchers working with large may unnecessarily present ordinations...

We conducted surveys of adults participating in municipally sponsored volunteer events the Portland, OR metropolitan area order to understand range attitudes and behaviors associated with work. sampled 172 individuals 18 from February June 2012. Principal components factor analyses survey responses identified three groups based on annual frequency participation stewardship events: first-time volunteers, mid-level volunteers (3–10 per year), frequent (>10 year). Our revealed main factors that...

Diel vertical migration is widespread across diverse taxa in the world's lakes and seas, yet its biogeochemical consequences are still poorly understood. The biologically mediated flux of material ocean (also known as "biological pump") a matter major interest concern, it thought to play an important role regulating carbon storage, by extension, global cycle. Recent studies spanning multiple trophic levels from fish dinoflagellates have led us concept coupled migrations that we refer...

MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 348:33-46 (2007) - DOI: https://doi.org/10.3354/meps07003 Mesozooplankton omnivory in upper San Francisco Estuary Scott M. Gifford1,*, Gretchen Rollwagen-Bollens2, Stephen Bollens2 1Department of Sciences, University Georgia, Athens, Georgia 30602-3636, USA 2School Biological Washington State Vancouver, 14204...

As part of a multi-year field study to investigate plankton dynamics in the Lower Columbia River Estuary (LCRE), we conducted monthly sampling mesozooplankton (> 73 μm) at station near Astoria, Oregon. The planktonic copepod community was numerically dominated by three non-indigenous species (NIS), Pseudodiaptomus forbesi, Limnoithona tetraspina, and Sinocalanus doerrii, two native species, Eurytemora affinis Diacyclops thomasi. However, seasonal co-occurrence copepods highly variable...

Abstract. We investigate relationships between environmental governance and water quality in two adjacent growing metropolitan areas the western US. While Portland, Oregon Vancouver, Washington metro share many common biophysical characteristics, they have different land development histories structures, providing a unique opportunity for examining how differences might affect quality. conceptualize possible linkages which influences directly, using monitoring efforts as metric, indirectly...

Nonindigenous aquatic species are becoming increasingly common in coastal and inland waters, largely due to the global transport of zooplankton via commercial shipping recreational boating. The cost mitigation lost income invasive is estimated billions dollars annually, yet we know little about temporal dynamics these invaders. Analysis an 8.5-year (June 2005–December 2013) time series from Columbia River revealed contrasting patterns invasion between species, cyclical periods community...

Abstract The role of protists in the diet larval Pacific herring ( Clupea pallasi ) was examined laboratory incubations conducted May and June 2008 using a natural assemblage microplankton (10–200 μm). Available prey consisted (diatoms, dinoflagellates, aloricate ciliates, loricate ciliates) metazoans (trochophores, bivalve larvae, rotifers, copepod nauplii, gastropod larvae). We used enumeration technique that included soft‐bodied heterotrophic (aloricate ciliates athecate dinoflagellates)...

Eutrophication of lakes and reservoirs has contributed to an increase in the magnitude frequency harmful cyanobacterial blooms; however, interactive effects nutrient availability (eutrophication) other abiotic biotic drivers have rarely been comprehensively studied field. We undertook eight-year (2005–2013) research program that assessed interaction multiple factors driving blooms Vancouver Lake, a large, shallow eutrophic lake Washington, USA. Our consisted nearly continuous monthly or...

Benthic algae and autotrophic seston are important bases of stream food webs, several different environmental factors may influence their biomass. We explored how benthic biomass (using chlorophyll-a as a proxy for algal biomass) were associated with temperature, channel width, canopy cover, cardinal orientation, macroinvertebrate functional feeding group abundance, salmonid biomass, water velocity in 16 small, fish-bearing streams the temperate rainforest Olympic Peninsula Washington State,...

AME Aquatic Microbial Ecology Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsSpecials 64:163-174 (2011) - DOI: https://doi.org/10.3354/ame01514 Microzooplankton grazing before, during and after a cyanobacterial bloom in Vancouver Lake, Washington, USA Jennifer Boyer, Gretchen Rollwagen-Bollens*, Stephen M. Bollens School of Earth Environmental Sciences, Washington State University Vancouver, 98686,...

The Asian copepod Pseudodiaptomus forbesi has conspicuously invaded the Columbia River, but its feeding behavior is poorly understood. We conducted experiments with P. and natural assemblages of microplankton collected from three sites in River. primarily consumed diatoms, ciliates, flagellates dinoflagellates, exhibiting a general preference for diatoms an avoidance chlorophytes cyanobacteria. These results suggest potential competition native copepods other food web impacts.

Hassett W, Bollens SM, Counihan TD, Rollwagen-Bollens G, Zimmerman J, Katz S, Emerson J. 2017. Veligers of the invasive Asian clam Corbicula fluminea in Columbia River Basin: broadscale distribution, abundance, and ecological associations. Lake Reserv Manage. 00:00–00.The was introduced to North America 1930s now inhabits most regions conterminous United States; however, distribution ecology C. Basin is poorly understood. During 2013 2014, 5 Columbia-Snake reservoirs were sampled monthly...

MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 447:49-54 (2012) - DOI: https://doi.org/10.3354/meps09467 Predator-enhanced diel vertical migration in a planktonic dinoflagellate Stephen M. Bollens*, Joel A. Quenette, Gretchen Rollwagen-Bollens School of Environment, Washington State University, 14204 NE Salmon Creek Ave., Vancouver, 98686, USA *Email:...

Abstract We present the first comprehensive analysis of Pacific Northwest estuaries ( PNWE ) zooplankton time series, which encompasses 38 distributed across more than 1000 km North American Coast. With observations spanning 20 yr, we here examine biogeographic trends among communities, patterns biological invasion region, and environmental correlates with dominant native invasive taxa. Our results show that some region are invaded by multiple species geographic extent is far greater...

Phytoplankton assemblage dynamics are sensitive to biotic and abiotic factors, as well anthropogenic stressors such eutrophication, thus likely vary between lakes of differing trophic state. We selected four in Washington State, USA, ranging from oligo- hypereutrophic, study the separate interactive effects enhanced nutrient availability zooplankton grazing on phytoplankton net growth rates overall microplankton (phytoplankton microzooplankton) structure. collected water quality plankton...