Michael A Banks

Michael A Banks
Oregon State University | OSU · Coastal Oregon Marine Experiment Station - Department of Fisheries and Wildlife

PhD (Population Genetics) MSc (Mariculture) HED

About

219
Publications
15,865
Reads
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3,585
Citations
Citations since 2017
20 Research Items
1100 Citations
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2017201820192020202120222023050100150200
2017201820192020202120222023050100150200
Additional affiliations
June 2006 - present
Cooperative Institute for Marine resources Studies, OSU
Position
  • Managing Director
February 2001 - present
Oregon State University
Position
  • Professor
April 1994 - January 2001
University of California, Davis
Position
  • Research Geneticist

Publications

Publications (219)
Article
Full-text available
Significance We present a model of biogenic magnetite formation in eukaryotes and hypothesize this genetic mechanism is used by broad forms of life for geomagnetic sensory perception. Countering previous assertions that salmon olfactory tissues lack biogenic magnetite, we determine that it is present in the form of compact crystal clusters and show...
Article
There are four distinct runs of Chinook Salmon (Oncorhynchus tshawytscha) in the Central Valley, named after their primary adult return times: fall, late-fall, winter, and spring run. Estimating the run-specific composition of juveniles entering and leaving the Sacramento–San Joaquin Delta is crucial for assessing population status and processes th...
Article
Full-text available
Synopsis Captive breeding can affect how sexual selection acts on subsequent generations. One context where this is important is in fish hatcheries. In many salmon hatcheries, spawning is controlled artificially and offspring are reared in captivity before release into the wild. While previous studies have suggested that hatchery- and natural-origi...
Chapter
Full-text available
Habitat fragmentation, land use practices, and flow impediments modify the natural course of rivers, disrupting connectivity and subsequently affecting dispersal and gene flow in aquatic organisms. Many of the relationships between the physical river network and the genetic structure of populations are not well understood. Riverscape genetics is a...
Article
Full-text available
Mate choice in most organisms is not random, but determined by a suite of interacting traits and environmental factors. While the selective pressures underlying differences in mate choice between species, populations, individuals and even within individuals has been gaining interest, there still remains unexplained variation in mate preferences esp...
Article
Full-text available
Significance Human activities alter and reduce phenotypic variation in many species, but the long-term consequences (e.g., ability of previous variation to reemerge), and thus the need for conservation action, are unclear. Here we show that dramatic, human-induced changes in adult migration characteristics of wild Chinook salmon are explained by ra...
Article
Surveys of juvenile and larval stages can be useful for management of commercially important marine fishes but require definitive species identification. From May through October 2005–2008, mid-water (30-m) trawls collected 78,407 late-larval and juvenile rockfish (Sebastes spp.) in shelf and slope waters off Oregon and Washington. Because of their...
Preprint
Full-text available
Anthropogenic habitat alterations can drive phenotypic changes in wild populations. However, the underlying mechanism (i.e., phenotypic plasticity and/or genetic evolution) and potential to recover previous phenotypic characteristics are unclear. Here we investigate the change in adult migration characteristics in wild salmon populations caused by...
Article
Full-text available
Traditional analysis in population genetics evaluates differences among groups of individuals and, in some cases, considers the effects of distance or potential barriers to gene flow. Genetic variation of organisms in complex landscapes, seascapes, or riverine systems, however, may be shaped by many forces. Recent research has linked habitat hetero...
Article
Managing intraspecific hybridization is crucial for maintaining a balance between inbreeding and outbreeding depression in winter and summer run steelhead (Oncorhynchus mykiss). While spatial distance is a common factor in maintaining reproductive isolation between these two ecotypes, physical barriers may also prevent hybridization, particularly i...
Article
Full-text available
Management and restoration planning for Pacific salmon is often characterized by efforts at broad multi-basin scales. However, finer-scale genetic and phenotypic variability may be present within individual basins and can be overlooked in such efforts, even though it may be a critical component for long-term viability. Here, we investigate Chinook...
Article
Full-text available
Significance Larval dispersal in the ocean is thought to be highly diffusive, but the pathways larvae follow during their pelagic stage are largely unknown, as direct tracking of larvae in the open ocean is not yet possible. We provide the first evidence of continuous aggregation of fish larvae over extensive periods in an oceanographically complex...
Data
Table S1. Summary of the number of juveniles collected in the screw trap, tissue sampled, and genotyped from 2009 to 2013. Table S2. Summary of the number of juveniles used in the adult–juvenile genetic pedigrees from 2008 to 2013, genotyping error rate, the percent of offspring with one unassigned parent, the percent of offspring with one unassig...
Article
Full-text available
Diversity in life history tactics contributes to the persistence of a population because it helps to protect against stochastic environments by varying individuals in space and time. However, some life history tactics may not be accounted for when assessing the demographic viability of a population. One important factor in demographic viability ass...
Article
Full-text available
Dams contribute to declines in fish abundance, in part, by blocking access to historical habitat. When fish ladders are infeasible, fish can be trapped below a dam and transported above to provide access to habitat. However, this conservation strategy has received little attention in the literature, and many questions regarding efficacy remain unan...
Data
Full-text available
Dams have contributed to the decline of migratory fishes by blocking access to historical habitat. The active transport (trap and haul) of migratory fish species above existing dams can sometimes support population recovery when the use of fish ladders or dam removal is infeasible. However, little is known about the efficacy of trap and haul conser...
Article
Full-text available
Understanding seasonal migration and localized persistence of populations is critical for effective species harvest and conservation management. Pacific salmon (genus Oncorhynchus) forecasting models predict stock composition, abundance, and distribution during annual assessments of proposed fisheries impacts. Most models, however, fail to account...
Article
Full-text available
Dams have contributed to the decline of migratory fishes by blocking access to historical habitat. The active transport (trap and haul) of migratory fish species above existing dams can sometimes support population recovery when the use of fish ladders or dam removal is infeasible. However, little is known about the efficacy of trap and haul conser...
Article
Full-text available
Expected daily FL ranges (length at date) of juvenile Chinook Salmon Oncorhynchus tshawytscha have been used throughout California's Central Valley to identify federally listed winter-run and spring-run juveniles in a mixed four-race stock. Accurate race identification is critical both to species recovery and to management of the water supply for 2...
Conference Paper
Full-text available
Highly magnetic receptor cells of trout that contain biogenic crystals of magnetite are hypothesized to transduce geomagnetic information into neural signals utilized by fish as orientation cues during migration. However, because these cells are extremely difficult to find and study, whether these cells are capable of magnetic signal transduction i...
Conference Paper
Many fish species have been negatively affected by the construction of high head dams because they alter temperature and flow regimes, as well as, impede fish migration. In recent years, managers have begun to reintroduce salmonids above dams in an effort to mitigate these effects. This strategy has been adopted on the South Fork McKenzie River, Or...
Conference Paper
Spring Chinook salmon in the upper Willamette River, Oregon are listed as threatened under the endangered species act. In this system spring Chinook are being reintroduced above several high-head dams in an effort to contribute to their recovery. In the South Fork McKenzie River, a Willamette River tributary, we have genetically monitored the sprin...
Article
Full-text available
Hatcheries support fisheries and aid in the recovery of endangered wild populations. Evidence for reduced reproductive success (RS) in wild-spawning hatchery-reared salmon compared with that in wild-born fish invites questions about the impact on subsequent generations. Immune gene-dependent mate preference is one mechanism known to influence salmo...
Article
Full-text available
The application of DNA-based markers toward the task of discriminating among alternate salmon runs has evolved in accordance with ongoing genomic developments and increasingly has enabled resolution of which genetic markers associate with important life-history differences. Accurate and efficient identification of the most likely origin for salmon...
Article
Full-text available
Abstract Managing weak stocks in mixed-stock fisheries often relies on proxies derived from data-rich indicator stocks, although there have been limited tests of the appropriateness of such proxies. For example, full cohort reconstruction of tagged Klamath River fall-run Chinook Salmon Oncorhynchus tshawytscha of northern California enables the use...
Article
Full-text available
Neutral genetic markers are routinely used to define distinct units within species that warrant discrete management. Human-induced changes to gene flow however may reduce the power of such an approach. We tested the efficiency of adaptive versus neutral genetic markers in differentiating temporally divergent migratory runs of Chinook salmon (Oncorh...
Article
Full-text available
The dynamic Quaternary geology of the Pacific Ring of Fire created substantial challenges for biogeography. Fish life history and population genetic variation were shaped by climate change, repeated formation and subsidence of ice sheets, sea-level change, volcanism and tectonics, isostatic rebound, and now human activities. It is widely recognized...
Conference Paper
It has been shown that hatchery fish have lower reproductive success (RS) than wild fish when breeding in the wild and that there is a carry-over effect from hatchery bred fish to subsequent generations of wild populations. One causal mechanism that has been suggested to result in reproductive differences between wild and hatchery fish and also amo...
Article
Full-text available
Rockfish species of the genus Sebastes are notable for being numerous and diverse. Rockfishes are unusual among fish because they fertilize their eggs internally and release live, swimming larvae. They undergo complex courting behaviors, which may allow females to be selective about their mates. The major histocompatibility complex (MHC) is implica...
Article
Full-text available
Euphausiid krill play a critical role in coastal and oceanic food webs, linking primary producers to upper trophic levels. In addition, some species support commercial fisheries worldwide. Despite their ecological importance, the genetics of these important species remain poorly described. To improve our understanding of the genetics of these ecolo...
Article
Full-text available
There is an urgent need to clarify how different stocks, or subpopulations of fish species, are vulnerable to fishing pressure and unfavorable ocean conditions because of the increasing demand on fisheries for human consumption. For marine fishes, the potential for high gene flow increases the difficulty in determining the number of subpopulations...
Article
Full-text available
The Antarctic krill (Euphausia superba Dana 1852) is widely distributed throughout the Southern Ocean, where it provides a key link between primary producers and upper trophic levels and supports a major commercial fishery. Despite its ecological and commercial importance, genetic population structure of the Antarctic krill remains poorly described...
Conference Paper
Construction of large dams in the upper Willamette River Basin of Oregon in the 1950s and 1960s blocked passage to adult spring Chinook and resulted in the loss of almost half of the most highly productive spawning and rearing habitat in the basin. In the McKenzie River basin, construction of Cougar Dam on the South Fork McKenzie River in 1963 bloc...
Article
Salmon utilize olfactory cues to guide natal stream homing during spawning migrations. Both inorganic and biogenic chemicals have been proposed as odorants that might be used by salmon during homing. In this study, we used genomic DNA sequence data from nine salmonid species to compare nucleotide identities for orthologous main olfactory receptor (...
Article
Full-text available
Members of the Anisakidae are known to infect over 200 pelagic fish species and have been frequently used as biological tags to identify fish populations. Despite information on the global distribution of Anisakis species, there is little information on the genetic diversity and population structure of this genus, which could be useful in assessing...
Article
Full-text available
Supplementation of wild salmonids with captive-bred fish is a common practice for both commercial and conservation purposes. However, evidence for lower fitness of captive-reared fish relative to wild fish has accumulated in recent years, diminishing the apparent effectiveness of supplementation as a management tool. To date, the mechanism(s) respo...