A5023991315- Marine and coastal ecosystems
- Fish Ecology and Management Studies
- Marine and fisheries research
- Aquatic Ecosystems and Phytoplankton Dynamics
- Marine Biology and Ecology Research
- Aquatic Invertebrate Ecology and Behavior
- Isotope Analysis in Ecology
- Coral and Marine Ecosystems Studies
- Marine Bivalve and Aquaculture Studies
- Coastal wetland ecosystem dynamics
- Marine Invertebrate Physiology and Ecology
- Marine Ecology and Invasive Species
- Soil and Water Nutrient Dynamics
- Crustacean biology and ecology
- Environmental Toxicology and Ecotoxicology
- Oceanographic and Atmospheric Processes
- Marine Toxins and Detection Methods
- Environmental DNA in Biodiversity Studies
- Cephalopods and Marine Biology
- Marine and environmental studies
- Water Quality and Pollution Assessment
- Marine animal studies overview
- Water resources management and optimization
- Hydrology and Watershed Management Studies
- Freshwater macroinvertebrate diversity and ecology
Washington State University Vancouver
2015-2024
Washington State University
2006-2020
San Francisco State University
2000-2006
Moss Landing Marine Laboratories
2002-2003
Woods Hole Oceanographic Institution
1991-1996
University of Washington
1988-1992
Seattle University
1992
Rutgers, The State University of New Jersey
1992
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...
Predator evasion is the most commonly hypothesized reason for diel vertical migrations undertaken by a wide variety of planktonic organisms in lakes and seas, yet direct evidence remains elusive. We tested predation hypothesis exposing enclosed populations marine copepod Acartia hudsonica to caged or free-ranging individuals their natural predator, planktivorous fish Gasterosteus aculeatus . After little more than week, adult copepods changed distribution migration behavior depending on...
The current prevailing theory of diel vertical migration (DVM) zooplankton is focused largely on two biotic drivers: food and predation. Yet recent evidence suggests that abiotic drivers such as damaging ultraviolet (UV) radiation temperature are also important. Here we integrate knowledge the effects factors DVM with biologically based paradigm to develop a more comprehensive framework for understanding in zooplankton. We focus “normal” (down during day, up at night) holoplanktonic,...
While diel vertical migration in zooplankton has been shown recently to be a predator avoidance behavior, the mechanism by which predators induce and maintain such behavior debated. We report results of an situ manipulation experiment during enclosed populations marine planktomc copepod Acaraa hudsonica rapidly changed their distribution depending on presence or absence planktivorous fish Casterosteus aculeatus These point unambiguously phenotypic behavioral plasticity individual planktonic...
As a field test of the hypothesis that variable diel vertical migration in zooplankton is response to variations abundance visually orienting predators, we sampled juvenile and adult planktivorous fish inhabiting temperate fjord (Dabob Bay, Washington) concurrently with distributions population female Calanus pacificus (Copepoda: Calanoida) known exhibit seasonally migration. Results nighttime trawling on seven dates between April 1985 October 1986 subsequent stomach content analyses showed...
We report results of a 3-yr field study the vertical distributions and diel migration (DVM) Pseudocalanus newmani in central basin Dabob Bay, Washington, USA. Our include two novel findings. First, statistically significant relationship exists between strength DVM P. potential predation impact its planktonic invertebrate predators. Second, strong "normal" (up at night, down during day), unique for 5 yr sampling this locale, occurred time when zooplanktivorous fish Ammodytes hexapterus was...
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...
Recent experimental evidence in both marine and freshwater systems indicates that predators can induce vertical migration behavior individual zooplankters, yet the specific cues by which zooplankters sense their appear to vary. In situ manipulation experiments were carried out with enclosed populations of planktonic copepod Acartia hudsonica re-examine potential role chemical A.hudsonica, test explicitly for mechanical or visual stimuli triggering this species. Adult female copepods induced...
Abstract Cordell, J. R., Bollens, S. M., Draheim, and Sytsma, M. 2008. Asian copepods on the move: recent invasions in Columbia–Snake River system, USA. – ICES Journal of Marine Science, 65: 753–758. Nine copepod species have been introduced into Northeast Pacific, seven which are largely confined to San Francisco estuary. However, several these recently invaded system Washington state, In addition calanoid Pseudodiaptomus inopinus, appeared 1980s, Columbia now has populations calanoids...
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...