A5037562127- Fish Ecology and Management Studies
- Hydrology and Sediment Transport Processes
- Marine and fisheries research
- Fish Biology and Ecology Studies
- Hydrology and Watershed Management Studies
- Wildlife Ecology and Conservation
- Marine Bivalve and Aquaculture Studies
- Genetic diversity and population structure
- Avian ecology and behavior
- Genetic and phenotypic traits in livestock
- Environmental DNA in Biodiversity Studies
- Aquatic Invertebrate Ecology and Behavior
- Fish biology, ecology, and behavior
- Underwater Acoustics Research
- Data Analysis with R
- Arctic and Antarctic ice dynamics
- Identification and Quantification in Food
- Isotope Analysis in Ecology
- Reproductive biology and impacts on aquatic species
- Flood Risk Assessment and Management
- Rangeland and Wildlife Management
- Water Quality and Resources Studies
- Mental Health Research Topics
- Ecology and biodiversity studies
- Collaborative Teaching and Inclusion
Oregon Department of Fish and Wildlife
2015-2024
RWTH Aachen University
2024
Oregon State University
2008-2021
United States Geological Survey
2006-2014
University of Guelph
2003-2009
The mortality of salmon smolts during their migration out freshwater and into the ocean has been difficult to measure. In Columbia River, which an extensive network hydroelectric dams, decline in abundance adult returning from since late 1970s ascribed large measure presence although completion hydropower system occurred at same time as large-scale shifts climate, measured by climate indices such Pacific Decadal Oscillation. We survival sea using elements acoustic telemetry system, Ocean...
Abstract Sea lampreys, Petromyzon marinus, are invasive to the Laurentian Great Lakes where they have decimated native fishes. sea lampreys been subjected control measures for several decades, and drive them has led major advances in understanding their biology informing management. In contrast, anadromous Pacific (Entosphenus tridentatus) co-evolved with oceanic prey. Both of these decline, a limited amount information on stymied conservation. The tendency make biological inferences about...
This paper synthesizes information on the at-sea ecology of ten anadromous lampreys, with emphasis trophic ecology. The these lampreys concerns juvenile stage, in which growth is most rapid. Anadromous can be categorized into four groups, based feeding modalities: 1) scavenger (Caspian lamprey, Caspiomyzon wagneri); 2) parasite-predator (Pacific Entosphenus tridentatus); 3) predators (western river Lampetra ayresii; European L. fluviatilis; Arctic Lethenteron camtschaticum; pouched Geotria...
Abstract The Pacific Lamprey Entosphenus tridentatus, an anadromous fish native to the northern Ocean and bordering freshwater habitats, has recently experienced steep declines in abundance range contractions along West Coast of North America. During early 1990s, Native American tribes recognized declining numbers lamprey championed their importance. In 2012, 26 entities signed a conservation agreement coordinate implement restoration research for Lamprey. Regional plans have identified...
Ten anadromous lamprey species (Petromyzontiformes) are recognized around the world, including four in Southern Hemisphere and six Northern Hemisphere. Eleven threats to these lampreys have been identified: climate change, shifting oceanographic regimes, artificial barriers, low water quantity/flow management, habitat degradation, poor quality, reduced availability, host prey predation, overharvest, disease. Artificial barriers a well-recognized threat lampreys. Management strategies improve...
Abstract Recovery of Endangered Species Act—listed salmonids in the Columbia River basin has relied upon efficacy U.S. Army Corps Engineer's juvenile salmon transportation program to move fish past Snake and hydropower dams. The effectiveness this been assessed by indirect method comparing smolt‐to‐adult returns. We present some first data mortality estimates barged run‐of‐river (ROR) radio‐tagged spring–summer Chinook Oncorhynchus tshawytscha after release lower River, representing years...
ABSTRACT The Pacific lamprey ( Entosphenus tridentatus ) is in decline the Columbia River Basin, and translocating adult to bypass difficult migration corridors has been implemented since 2000. We describe report results from two current translocation programs, provide context for use of translocation, discuss potential benefits, risks, uncertainties. Both programs appear have increased number spawning adults presence larvae juveniles; however, any subsequent increase naturally will require...
Lampreys (Petromyzontiformes) have persisted over millennia and now suffer a recent decline in abundance. Complex life histories may factored their persistence; anthropogenic perturbations demise. The complexity of lampreys is not understood, particularly for the anadromous Pacific lamprey, Entosphenus tridentatus Gairdner, 1836. Our goals were to describe maturation timing associated characteristics adult test null hypothesis that different do exist. Females exhibited early vitellogenesis –...
Abstract Each year, thousands of fishes are tagged with electronic devices to study their biology and inform fisheries management. Such research assumes that the process capturing, tagging, then holding fish allow them recover before release (i.e., “tagging process”) does not alter physiology, behavior, survival these fish. However, can experience physiological challenges during tagging may affect behavior survival. We have observed rationale used establish protocols for durations conditions...
FisheriesVolume 44, Issue 5 p. 243-245 Essay A Call for Standard Terminology Lamprey Life Stages Benjamin J. Clemens, Corresponding Author Clemens ben.clemens@oregonstate.edu Oregon Department of Fish and Wildlife, Corvallis Research Lab, 28655 Highway 34, Corvallis, OR, 97333Search more papers by this author First published: 10 January 2019 https://doi.org/10.1002/fsh.10227Citations: 11Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare...
Abstract We estimated the survival of juvenile salmonids out‐migrating through lower Columbia River to Pacific Ocean. tested null hypotheses that no association exists between and transportation type (including barge in‐river migration with transportation), release date, river flow, mean body weight, tag type. During 2002‐2004, spring‐summer (SS) fall Chinook salmon Oncorhynchus tshawytscha steelhead O. mykiss were implanted uniquely coded radio or acoustic transmitter tags released during...
Abstract – Pacific lamprey, Entosphenus tridentatus , return to streams and use somatic energy fuel maturation. Body size decreases, the lamprey mature, spawn, then die. We predicted that warm, summer temperatures (>20 °C) would accentuate shrinkage in body size, expedite sexual maturation subsequent death. compared fish reared laboratory at diel fluctuating of 20–24 °C (mean = 21.8 with cooler (13.6 °C). The results confirmed our predictions. Lamprey from warm water group showed...
Abstract Knowledge of the biology, distribution, and abundance lampreys (Petromyzontiformes) is critical to inform conservation actions for native species control measures invasive Sea Lamprey Petromyzon marinus Laurentian Great Lakes. Lampreys have complex life cycles that include a freshwater larval stage in which they burrow into substrates consisting fine sediment organic matter. The frequently targeted research monitoring; given this interest, review survey designs methods needed. Our...
Abstract Interest in the effects of warmwater temperatures (≥ 20°C) on fishes has grown as biologists attempt to understand impacts climate change native species. Previous research hypothesized that rivers displaying and low river flows, such may become more common with North America, select against Pacific Lamprey Entosphenus tridentatus migrating spawning upper reaches some watersheds. I provide new information from different locations supports this hypothesis, including observations...
Abstract Native lampreys continue to be misunderstood by some citizens in the Pacific Northwest (PNW; USA). This misunderstanding is caused persistent misperceptions reinforced media and exacerbated a long‐running (mid‐1900s present) pervasive outreach campaign on control of invasive sea lamprey ( Petromyzon marinus ) Laurentian Great Lakes, Lake Champlain Finger Lakes New York. The use encourage conservation native PNW has been comparatively recent. Along with other non‐salmonid fishes,...
Deepwater ciscoes (genus Coregonus, subgenus Leucichthys) radiated into six phenotypes that occupy different depths in the Great Lakes, based upon body size and lipid content. Large, lipid-dense greater than small, lean ciscoes. This relationship is observed between adults juveniles of most prevalent deepwater cisco, bloater (C. hoyi Gill). Lipid-dense adult bloaters are restricted to hypolimnion, whereas found primarily epilimnion. article critically reviews, synthesizes, provides...
Abstract We examined occupancy and density of larval lampreys ( Entosphenus tridentatus Lampetra spp.) in two rivers Oregon (USA) restored to a Stage 0 condition 1–5 years prior, using multiscale model zero‐inflated Poisson mixture model. sampled backpack electrofishing randomly distributed, paired, 1‐m 2 quadrats recorded environmental data. Probabilities were higher when water velocity was low, the substrate noncompacted, sediment dominated by fines (<4 mm). At mean depth (0.34 m) (0.09...
Abstract Organisms have adapted to dynamic river flows as part of the natural flow regime. However, climate change and humans' use fresh water are associated with decreases in quality quantity surface waters. In addition, impoundments withdrawals for human regulate dampen dynamism many rivers. These changes regime can impact spawning migrations lampreys (Petromyzontiformes). Here, our goal is review ecology lamprey flows, considerations controlling invasive sea ( Petromyzon marinus )...
Abstract Pacific lamprey Entosphenus tridentatus is an anadromous fish native to the Northwest of USA . That has declined substantially over last 40 years. Effective conservation this species will require understanding habitat requirements for each life history stage. Because its cycle contains extended freshwater rearing (3–8 years), larval stage may be a critical factor limiting abundance lamprey. The objective our study was estimate influence barriers and characteristics on...