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Brock Huntsman

Brock Huntsman - California Water Science Center

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Bay-Delta Catchability Study

Addressing Catchability Bias in Fish Surveys San Francisco Bay and the Sacramento-San Joaquin Delta collectively make up the "Bay-Delta." In the scientific study of fish, "catchability" refers to the probability that a fish will be captured by a particular fishing gear or method. Catchability is a measure of how effectively a fishing gear or method can capture fish. "Catch data" refer to...
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California Water Science Center
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Bay-Delta Catchability Study

Addressing Catchability Bias in Fish Surveys San Francisco Bay and the Sacramento-San Joaquin Delta collectively make up the "Bay-Delta." In the scientific study of fish, "catchability" refers to the probability that a fish will be captured by a particular fishing gear or method. Catchability is a measure of how effectively a fishing gear or method can capture fish. "Catch data" refer to...
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stream surrounded by water

Santa Ana River Native Fish Study

Native Fish Population and Habitat Study, Santa Ana River, California The Santa Ana River, the largest river in southern California, flows through diverse landscapes, from the high desert to urban and suburban areas in Orange, Riverside, and San Bernardino Counties, stretching approximately 96 miles (154 kilometers) from its headwaters in the San Bernardino Mountains to its mouth at the Pacific...
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California Water Science Center
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Santa Ana River Native Fish Study

Native Fish Population and Habitat Study, Santa Ana River, California The Santa Ana River, the largest river in southern California, flows through diverse landscapes, from the high desert to urban and suburban areas in Orange, Riverside, and San Bernardino Counties, stretching approximately 96 miles (154 kilometers) from its headwaters in the San Bernardino Mountains to its mouth at the Pacific...
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juvenile fish being held in palm of hand

Aquatic Ecology Group

The California Water Science Center's Aquatic Ecology Group is making great strides in research and reporting.
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California Water Science Center
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Aquatic Ecology Group

The California Water Science Center's Aquatic Ecology Group is making great strides in research and reporting.
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Santa Ana River Native Fish Population and Habitat Data, Santa Ana River, California, 2022

This dataset includes 2022 reach fish data and reach habitat data collected to support development of the upper Santa Ana River Habitat Conservation Plan for the Santa Ana Sucker (Catostomus santaanae) and the Arroyo Chub (Gila orcutti) in the Santa Ana River, California.
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California Water Science Center

Distribution and stomach contents of fishes in the northern Sacramento-San Joaquin Delta, 2020-2022

This data set includes count, location, and ancillary habitat data for fishes sampled in adjacent reaches of Georgiana Slough, Sacramento River, and Steamboat Slough in the northern Sacramento-San Joaquin Delta. It also includes data on the stomach contents of selected individual black basses (Micropterus). Fishes were sampled by boat electrofishing from approximately January-May, 2020...
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California Water Science Center, Western Fisheries Research Center, Columbia River Research Laboratory (CRRL)

Detection range and efficiency of acoustic telemetry receivers in Clear Lake, Lake County, California

Data on the detection range and efficiency of VR2W-69 kHz acoustic receivers (Innovasea Marine Systems Canada Inc., Bedford, Nova Scotia, Canada; https://www.vemco.com/) were collected to guide the development of telemetry studies of the Clear Lake Hitch (Lavinia exilicauda chi), an imperiled fish species endemic to Clear Lake, Lake County, California. The study took place June 21, 2021...
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California Water Science Center

Data used in projected air and water temperatures for selected regions of the upper San Francisco Estuary and Yolo Bypass under 20 scenarios of climate change 2020-2099

Understanding the effects of climate change is a substantial challenge in estuarine systems because the mixing of freshwater and ocean water adds complexity to climate change projections. Such climate change projections have been conducted in the San Francisco Estuary as part of the U.S. Geological Survey's CASCaDE Project. In this project, we assessed downscaled air temperature data...
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California Water Science Center

Santa Ana River Native Fish Population and Habitat Data, Santa Ana River, California, 2020

This dataset includes 2020 reach fish data and reach habitat data collected to support development of the upper Santa Ana River Habitat Conservation Plan for the Santa Ana Sucker (Catostomus santaanae) and the Arroyo Chub (Gila orcutti) in the Santa Ana River, California.
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California Water Science Center

Largemouth bass population assessment within flooded islands of the Sacramento-San Joaquin Delta

Field and laboratory data collected for fishes sampled by boat electrofishing in the Sacramento-San Joaquin delta, CA. This data release includes all measured environmental parameters, body composition analyses, otoliths, and fish taxa included in the analysis.
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California Water Science Center
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Gillnet sampling methods for monitoring status and trends of Clear Lake Hitch in Clear Lake, Lake County, California

The Clear Lake Hitch (Lavinia exilicauda chi) is a minnow endemic to Clear Lake, Lake County, California. This species is listed as a threatened species under the California Endangered Species Act and has been petitioned for listing under the United States Endangered Species Act. In 2017, the U.S. Geological Survey, in cooperation with the U.S. Fish and Wildlife Service, initiated a...
Authors
Frederick Feyrer, Matthew J. Young, Brock Huntsman, Veronica Violette, Justin K. Clause, Jordan Buxton, Danielle Palm, Marissa L. Wulff, Jeff Gronemyer, Luis Santana
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California Water Science Center

Estimating the benefits of floodplain restoration to juvenile Chinook salmon in the upper San Francisco Estuary, United States, under future climate scenarios

Many river systems within the Central Valley of California have been disconnected from their floodplains, hypothesized to be partially responsible for declining Chinook salmon populations (Oncorhynchus tshawytscha). The primary floodplain of the system, Yolo By-Pass (known regionally as “Yolo Bypass”), offered an opportunity to examine whether improved connectivity between the floodplain...
Authors
Brock Huntsman, Marissa L. Wulff, Noah Knowles, Ted Sommer, Frederick V. Feyrer, Larry R. Brown
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Water Resources Mission Area, California Water Science Center

Evaluation of extinction risk for stream fishes within an urban riverscape using population viability analysis

1. The Santa Ana River in the Los Angeles region of California demonstrates common habitat degradation symptoms that are characteristic of the urban stream syndrome. These impacts have altered the Santa Ana River community structure, with few species as impacted as the native Santa Ana sucker (sucker; Pantosteus santaanae). 2. Consequently, a recovery plan developed for sucker identified...
Authors
Brock Huntsman, Kai Palenscar, Kerwin Russell, Brett Mills, Chris D. Jones, William Ota, Kurt E. Anderson, Heather Dyer, Fitsum Abadi, Marissa L. Wulff
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Water Resources Mission Area, California Water Science Center

Climate change scenarios for air and water temperatures in the upper San Francisco Estuary: Implications for thermal regimes and Delta Smelt

Climate projections and their effects in the San Francisco Estuary have been evaluated as part of the US Geological Survey’s CASCaDE2 project. Understanding the ecological effects of climate change can help manage and maintain the ecological health and productivity of the San Francisco Estuary. In this study, we assessed downscaled air temperature data from 10 global climate models (GCMs...
Authors
Brock Huntsman, Larry R. Brown, Marissa L. Wulff, Noah Knowles, R. Wayne Wagner, Frederick V. Feyrer
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Water Resources Mission Area, California Water Science Center

Physics to fish—Understanding the factors that create and sustain native fish habitat in the San Francisco Estuary

Executive SummaryThe Bureau of Reclamation (Reclamation) operates the Central Valley Project (CVP), one of the nation’s largest water projects. Reclamation has an ongoing need to improve the scientific basis for adaptive management of the CVP and, by extension, joint operations with California’s State Water Project. The U.S. Geological Survey (USGS) works cooperatively with the Bureau of...
Authors
Larry R. Brown, David E. Ayers, Brian Bergamaschi, Jon R. Burau, Evan T. Dailey, Bryan D. Downing, Maureen A. Downing-Kunz, Frederick V. Feyrer, Brock Huntsman, Tamara E. C. Kraus, Tara Morgan, Jessica R. Lacy, Francis Parchaso, Cathy Ruhl, Elizabeth B. Stumpner, Paul Stumpner, Janet K. Thompson, Matthew J. Young
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Water Resources Mission Area, California Water Science Center, Pacific Coastal and Marine Science Center

Microhabitat use of native Santa Ana sucker and arroyo chub in an effluent-dominated southern California stream

A significant amount of the base flow of the Santa Ana River, located within California's arid Los Angeles metropolitan region, originates from two wastewater treatment facilities: the Rialto wastewater treatment facility and Rapid Infiltration and Extraction facility. The Santa Ana sucker (Pantosteus santaanae, syn. Catostomus santaanae) and arroyo chub (Gila orcuttii) are two native...
Authors
Brock Huntsman, Larry R. Brown, Jason May, Kai Palenscar, Kerwin Russell, Heather Dyer, Marissa L. Wulff, Brett Mills, Chris D. Jones
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Water Resources Mission Area, California Water Science Center

Hydrodynamics and habitat interact to structure fish communities within terminal channels of a tidal freshwater delta

Terminal channels were historically a common feature of tidal delta ecosystems but have become increasingly rare as landscapes have been modified. Tidal hydrodynamics are a defining feature in tidal terminal channel ecosystems from which native aquatic communities have evolved. However, few studies have explored the relationship between fish community structure and hydrodynamics in these...
Authors
Brock Huntsman, Matthew J. Young, Frederick V. Feyrer, Paul Stumpner, Larry R. Brown, Jon R. Burau
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Water Resources Mission Area, California Water Science Center

Density effects on native and non-native trout survival in streams

Environmental stressors associated with a changing climate and non-native fish, individually, represent significant threats to native fish conservation. These threats can exacerbate risks to native fishes when conditions interact at the trailing edge of a population's distribution. We collected capture–mark–recapture data for Rio Grande cutthroat trout (RGCT, Oncorhynchus clarkii...
Authors
Brock Huntsman, Lauren M Flynn, Colleen A. Caldwell, Abigail Lynch, Fitsum Abadi
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Cooperative Research Units

Joint-species analysis reveals potential displacement of native fishes by non-native fishes within the Santa Ana River, California

Accurate estimates of abundance are a cornerstone for resource managers to make effective decisions for fish conservation. However, multiple sampling methods often are required to sample fish communities, and ignoring the detection process can create substantial bias in latent state parameter estimation (e.g., abundance, survival). We developed a joint-species N-mixture model that...
Authors
Brock Huntsman, Larry R. Brown, Kai Palenscar, Chris D. Jones, Kerwin Russell, Heather Dyer, Brett Mills, Marissa L. Wulff, Jason May
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Water Resources Mission Area, California Water Science Center

Relative bias in catch among long-term fish monitoring surveys within the San Francisco Estuary

Fish monitoring gears rarely capture all available fish, an inherent bias in monitoring programs referred to as catchability. Catchability is a source of bias that can be affected by numerous aspects of gear deployment (e.g., deployment speed, mesh size, and avoidance behavior). Thus, care must be taken when multiple surveys—especially those using different sampling methods—are combined...
Authors
Brock Huntsman, Brian Mahardja, Samuel M. Bashevkin
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Water Resources Mission Area, California Water Science Center

Disentangling stationary and dynamic estuarine fish habitat to inform conservation: Species-specific responses to physical habitat and water quality in San Francisco Estuary

Estuaries represent critical aquatic habitat that connects surface water distributed between Earth’s landmasses and oceans. They are dynamic transitional ecosystems, which provide important habitat for fishes and other aquatic organisms. Effective conservation of species inhabiting estuaries requires knowledge of the habitat features that drive their abundance and distribution. We sought...
Authors
Frederick V. Feyrer, Matthew J. Young, Brock Huntsman, Larry R. Brown
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Water Resources Mission Area, California Water Science Center

Interagency Ecological Program long-term monitoring element review: Pilot approach and methods development (2020)

This report describes the first-year, pilot-phase of what is intended to be a larger, multiple-year review of all IEP core long-term monitoring elements (LTMEs). Here we hope to provide evidence that the review team arrangement and communication schedule was effective at developing a framework to objectively evaluate a suite of LTMEs. We focused on developing methods for an effective...
Authors
Jereme W. Gaeta, Samuel M. Bashevkin, Frederick V. Feyrer, Brock Huntsman, Brian Mahardja, Steven D. Culberson, Michael P Beakes, Stephanie Fong, Stephen Louie
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Water Resources Mission Area, California Water Science Center
Scientists Continue Their Study of the Santa Ana Sucker

Scientists Continue Their Study of the Santa Ana Sucker

In the ongoing research of the Santa Ana Sucker (Pantosteus santaanae) USGS scientists try out different sampling methods.   

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