A SM4 bat detector is deployed at Kwagunt Canyon in Grand Canyon. This weatherproof detector records ultrasonic bat calls. Photo by Anya Metcalfe, USGS, SBSC. This is part of an ongoing study during a study that is examining bat abundance and foraging in Grand Canyon along the Colorado River.
Anya Nova Metcalfe
Anya Metcalfe is a stream ecologist specializing in aquatic food webs of the Colorado River Basin. Her research investigates the role of insect life cycles and natural history in the structure of aquatic communities on landscape scales.
Bug Flows: Improving food web health by giving bugs the weekends off
Bug Flows: Improving food web health by giving bugs the weekends off
Investigating the effects of dam releases on insect life cycles
River guides are science guides
River guides are science guides
Society for Freshwater Science 'Making Waves' podcast Episode 49
Bat foraging along the Colorado River in Grand Canyon
Bat foraging along the Colorado River in Grand Canyon
USGS scientists are contributing to our understanding of bats in National Parks
Science and Products
Bat foraging ecology along the Colorado River in Grand Canyon
Grand Canyon National Park is a hotspot for bat diversity. Twenty-two bat species have been documented in the Park, more than any other national park unit.
Community Science in Grand Canyon
Aquatic insects are important components of riverine foodwebs as they are prey for fish, birds, bats, lizards, and spiders. The closure of Glen Canyon Dam in 1963 fundamentally altered the hydrology, water temperature, and turbidity of the Colorado River through Grand Canyon. These changes, along with competition with invasive species and limited food availability have led to the decline and...
Bug Flows: Improving Food Web Health on the Colorado River
Native and desired nonnative fish downstream of Glen Canyon Dam are food limited—meaning that if more or larger invertebrate food items were available, there would be more and larger fish. Aquatic insects have complex life cycles that include egg, larvae, and pupal stages that are aquatic while adults have wings and are typically terrestrial. Aquatic insects are a fundamental component of river...
A SM4 bat detector is deployed in Grand Canyon to record ultrasonic bat calls
A SM4 bat detector is deployed at Kwagunt Canyon in Grand Canyon. This weatherproof detector records ultrasonic bat calls. Photo by Anya Metcalfe, USGS, SBSC. This is part of an ongoing study during a study that is examining bat abundance and foraging in Grand Canyon along the Colorado River.
A incognito SM4 bat detector that records ultrasonic bat calls is hidden in a mesquite tree in Grand Canyon near the Colorado River
linkAn incognito SM4 bat detector is placed in a hidden location in a mesquite tree in Grand Canyon near the Colorado River, below Emerald Rapid. This weatherproof detector records ultrasonic bat calls. This is part of an ongoing study during a study that is examining bat abundance and foraging in Grand Canyon.
A incognito SM4 bat detector that records ultrasonic bat calls is hidden in a mesquite tree in Grand Canyon near the Colorado River
linkAn incognito SM4 bat detector is placed in a hidden location in a mesquite tree in Grand Canyon near the Colorado River, below Emerald Rapid. This weatherproof detector records ultrasonic bat calls. This is part of an ongoing study during a study that is examining bat abundance and foraging in Grand Canyon.
A properly rigged cataraft on the banks of the Green River
A properly rigged cataraft on the banks of the Green River in the Uintah Basin
A properly rigged cataraft on the banks of the Green River in the Uintah Basin
Hydrologist Nick plays a river tune
Hydrologist Nick plays a river tune
Hydrologist Nick plays a river tune
Team D braces itself on a bluff to watch another beautiful sunset
Team D braces itself on a windy bluff to watch another beautiful sunset
Team D braces itself on a windy bluff to watch another beautiful sunset
Graham birds from a duckie.
Graham birds from a duckie. USGS isn't only geology and Graham isn't only a geologist!
Graham birds from a duckie. USGS isn't only geology and Graham isn't only a geologist!
Mitch and Graham collect sediment samples on a transect
Mitch and Graham collect sediment samples on a transect
Mitch and Graham collect sediment samples on a transect
Bill Burton with Paper Powell and the first female geologist
Bill Burton with Paper Powell and (I think??) the first female geologist at USGS.
Bill Burton with Paper Powell and (I think??) the first female geologist at USGS.
Tom, Tildon Jones (USFWS), and Jim Prairie (BoR)
Tom, Tildon Jones (USFWS), and Jim Prairie (BoR) present at the Green River Campground for an "evening program" at Dinosaur National Monument. Many campers were in attendance, as were several deer across the river.
Tom, Tildon Jones (USFWS), and Jim Prairie (BoR) present at the Green River Campground for an "evening program" at Dinosaur National Monument. Many campers were in attendance, as were several deer across the river.
A block print illustration of a Myotis bat species by Kate Aitchison, done through a RISD/USGS internship
linkA block print of a Myotis bat species by Kate Aitchison, done through a RISD/USGS internship with the Southwest Biological Science Center, 2015.
A block print illustration of a Myotis bat species by Kate Aitchison, done through a RISD/USGS internship
linkA block print of a Myotis bat species by Kate Aitchison, done through a RISD/USGS internship with the Southwest Biological Science Center, 2015.
WHAT YOU TAKE AWAY - A Colorado River Reflection
Meet Katie, one of the 40 million people who depend on the Colorado River. Pondering life after high school, Katie finds comfort in reflecting on her time in one of the Nation’s most iconic National Parks.
Meet Katie, one of the 40 million people who depend on the Colorado River. Pondering life after high school, Katie finds comfort in reflecting on her time in one of the Nation’s most iconic National Parks.
Science and Products
Bat foraging ecology along the Colorado River in Grand Canyon
Grand Canyon National Park is a hotspot for bat diversity. Twenty-two bat species have been documented in the Park, more than any other national park unit.
Community Science in Grand Canyon
Aquatic insects are important components of riverine foodwebs as they are prey for fish, birds, bats, lizards, and spiders. The closure of Glen Canyon Dam in 1963 fundamentally altered the hydrology, water temperature, and turbidity of the Colorado River through Grand Canyon. These changes, along with competition with invasive species and limited food availability have led to the decline and...
Bug Flows: Improving Food Web Health on the Colorado River
Native and desired nonnative fish downstream of Glen Canyon Dam are food limited—meaning that if more or larger invertebrate food items were available, there would be more and larger fish. Aquatic insects have complex life cycles that include egg, larvae, and pupal stages that are aquatic while adults have wings and are typically terrestrial. Aquatic insects are a fundamental component of river...
A SM4 bat detector is deployed in Grand Canyon to record ultrasonic bat calls
A SM4 bat detector is deployed at Kwagunt Canyon in Grand Canyon. This weatherproof detector records ultrasonic bat calls. Photo by Anya Metcalfe, USGS, SBSC. This is part of an ongoing study during a study that is examining bat abundance and foraging in Grand Canyon along the Colorado River.
A SM4 bat detector is deployed at Kwagunt Canyon in Grand Canyon. This weatherproof detector records ultrasonic bat calls. Photo by Anya Metcalfe, USGS, SBSC. This is part of an ongoing study during a study that is examining bat abundance and foraging in Grand Canyon along the Colorado River.
A incognito SM4 bat detector that records ultrasonic bat calls is hidden in a mesquite tree in Grand Canyon near the Colorado River
linkAn incognito SM4 bat detector is placed in a hidden location in a mesquite tree in Grand Canyon near the Colorado River, below Emerald Rapid. This weatherproof detector records ultrasonic bat calls. This is part of an ongoing study during a study that is examining bat abundance and foraging in Grand Canyon.
A incognito SM4 bat detector that records ultrasonic bat calls is hidden in a mesquite tree in Grand Canyon near the Colorado River
linkAn incognito SM4 bat detector is placed in a hidden location in a mesquite tree in Grand Canyon near the Colorado River, below Emerald Rapid. This weatherproof detector records ultrasonic bat calls. This is part of an ongoing study during a study that is examining bat abundance and foraging in Grand Canyon.
A properly rigged cataraft on the banks of the Green River
A properly rigged cataraft on the banks of the Green River in the Uintah Basin
A properly rigged cataraft on the banks of the Green River in the Uintah Basin
Hydrologist Nick plays a river tune
Hydrologist Nick plays a river tune
Hydrologist Nick plays a river tune
Team D braces itself on a bluff to watch another beautiful sunset
Team D braces itself on a windy bluff to watch another beautiful sunset
Team D braces itself on a windy bluff to watch another beautiful sunset
Graham birds from a duckie.
Graham birds from a duckie. USGS isn't only geology and Graham isn't only a geologist!
Graham birds from a duckie. USGS isn't only geology and Graham isn't only a geologist!
Mitch and Graham collect sediment samples on a transect
Mitch and Graham collect sediment samples on a transect
Mitch and Graham collect sediment samples on a transect
Bill Burton with Paper Powell and the first female geologist
Bill Burton with Paper Powell and (I think??) the first female geologist at USGS.
Bill Burton with Paper Powell and (I think??) the first female geologist at USGS.
Tom, Tildon Jones (USFWS), and Jim Prairie (BoR)
Tom, Tildon Jones (USFWS), and Jim Prairie (BoR) present at the Green River Campground for an "evening program" at Dinosaur National Monument. Many campers were in attendance, as were several deer across the river.
Tom, Tildon Jones (USFWS), and Jim Prairie (BoR) present at the Green River Campground for an "evening program" at Dinosaur National Monument. Many campers were in attendance, as were several deer across the river.
A block print illustration of a Myotis bat species by Kate Aitchison, done through a RISD/USGS internship
linkA block print of a Myotis bat species by Kate Aitchison, done through a RISD/USGS internship with the Southwest Biological Science Center, 2015.
A block print illustration of a Myotis bat species by Kate Aitchison, done through a RISD/USGS internship
linkA block print of a Myotis bat species by Kate Aitchison, done through a RISD/USGS internship with the Southwest Biological Science Center, 2015.
WHAT YOU TAKE AWAY - A Colorado River Reflection
Meet Katie, one of the 40 million people who depend on the Colorado River. Pondering life after high school, Katie finds comfort in reflecting on her time in one of the Nation’s most iconic National Parks.
Meet Katie, one of the 40 million people who depend on the Colorado River. Pondering life after high school, Katie finds comfort in reflecting on her time in one of the Nation’s most iconic National Parks.