Mission Areas


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The Ecosystems Mission Area provides impartial science information and tools to the Nation’s natural resource managers, with particular focus on the science needs of the Department of the Interior (DOI) and DOI bureaus to manage species, lands and priority ecosystems; fulfill treaty obligations; respond to and reduce threats to natural resources; and manage mineral and energy resources.


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Filter Total Items: 740
Date published: March 1, 2019
Status: Active

Bees of the Northeastern U.S.


Declines of pollinators have engendered worldwide concern, but trends in the faunas of most insect pollinators, including bees, remain uncertain.  We are studying the bee fauna of southern Rhode Island to provide baseline information about the current fauna, and information about bee-flower interactions.

Date published: March 1, 2019
Status: Active

Integrating Mapping and Modeling to Support the Restoration of Bird Nesting Habitat at Breton Island National Wildlife Refuge

Breton Island, located at the southern end of the Chandeleur Islands, Louisiana, is part of the Breton National Wildlife Refuge (NWR) established in 1904 by Theodore Roosevelt. Breton NWR is recognized as a globally important bird habitat because of the resources it provides, and hosts one of Louisiana's largest historical brown pelican nesting colonies. Without actions to restore sand to the...

Date published: March 1, 2019
Status: Active

Environmental Management of Vector-borne Diseases

Effective management programs for vector-borne pathogens, such as West Nile Virus and the Lyme disease spirochete, are necessary to protect public health.  However, some vector control methods, such as landscape manipulations and pesticide applications, can also adversely affect nontarget species and environmentally sensitive natural systems.  Efficient targeting and integration of vector...

Date published: March 1, 2019
Status: Active

A Structured Decision-Making Framework for Controlling, Monitoring, and Containment of Invasive Species through Trapping: An Application to the Argentine Black and White Tegu

USGS is applying decision analysis to identify cost-effective methods for controlling invasive species like the Argentine black and white tegu.

Date published: March 1, 2019
Status: Active

Climate Change Adaptation for Coastal National Wildlife Refuges

National Wildlife Refuges provide habitat for important fish and wildlife species and services that benefit coastal communities, like storm-surge protection. USGS scientists are helping coastal refuges plan for and adapt to sea-level rise. 

Date published: February 28, 2019
Status: Active

Decision Analysis to Help Improve the Effectiveness of Invasive Plants Management

Melaleuca is an invasive tree that is highly problematic in the Everglades, threatening native wildlife and habitat. USGS is helping to improve management strategies for the invasive plant. 

Date published: February 28, 2019
Status: Completed

Fish Slam November 2018

In November 2018, USGS researchers joined partners in South Florida where they sampled freshwater bodies for non-native fishes. The bi-annual Fish Slam event helps monitor new introductions and document range expansion of known non-native fishes. 

Date published: February 28, 2019
Status: Active

Quantifying Restoration Benefits to Native Stream Fishes

This project is a collaboration of scientists from the USGS and University of Georgia to collect and analyze data describing how small-stream fishes use habitats created through stream restoration activities.  The USFWS Region 4 requested this Science Support Partnership (SSP) project as a means to evaluate the effectiveness of stream restoration (primarily in north Georgia, and potentially in...

Date published: February 27, 2019
Status: Active

Effects of Native and Non-native Fishes on Native Apple Snail Population Dynamics

The Florida apple snail is a critical component of the state's wetland food webs. USGS scientists assess the effects of native and non-native fishes on the native snail populations.

Contacts: Pamela J Schofield, Ph.D., Daniel Slone, Ph.D., Kristen Reaver, Philip C. Darby, Ph.D., Silvia M. Gutierre, Ph.D.
Date published: February 27, 2019
Status: Active

Development of a Quantitative Risk Assessment Tool to Predict Invasiveness of Non-native Freshwater Fishes in Everglades National Park

The introduction of non-native fishes is a problem across the United States, particularly in Florida. USGS scientists are developing a decision support tool to help natural resourece managers prioritize which species to focus prevention, detection, rapid response, and control efforts. 

Contacts: Pamela J Schofield, Ph.D., Daniel Slone, Ph.D., William F. Loftus, Jeff Kline
Date published: February 27, 2019
Status: Active

Habitat Modeling for the Endangered Everglades Snail Kite and Its Prey

Joint Ecosystem Modeling (JEM) provides real-time habitat suitability models for species of interest in Everglades restoration planning, including the federally endangered Everglades snail kite. 

Date published: February 26, 2019
Status: Active

Mycobacteriosis among northern snakehead fish in the Potomac River

Mycobacteriosis among northern snakehead fish in the Potomac River

Filter Total Items: 118
Date published: June 12, 2018

DATA RELEASE - Simulated Soil Water Potential in National Parks and Monuments of the Southern Colorado Plateau, 1915-2099—Data

These data were simulated using the SOILWAT model and were intended to characterize soil-water conditions at different ecological sites on the southern Colorado Plateau. The sites simulated correspond with Inventory and Monitoring plots established by the National Park Service’s Southern Colorado Plateau Network.

Date published: June 5, 2018

DATA RELEASE - The influence of water temperature on salmonid recruitment and adult size in tailwaters across western North America—Data

These data were used to examine drivers behind changes in water temperature downriver of dams across the western U.S. from 1995-2015 and the influence of such changes on rainbow trout recruitment and rainbow and brown trout adult length.

Date published: May 3, 2018

Land Treatment Exploration Tool

The Land Treatment Exploration Tool is designed for resource managers to use when planning land treatments. The tool provides useful summaries of environmental characteristics of planned treatment areas and facilitates adaptive management practices by comparing those characteristics to other similar treatments within a specified distance or area of interest. ...

Date published: May 2, 2018

DATA RELEASE - Population dynamics of humpback chub, rainbow trout and brown trout in the Colorado River in its Grand Canyon Reach: modelling code and input data

These data were compiled to fit an integrated population model of brown trout in the Glen Canyon reach of the Colorado River and test hypotheses regarding the driver of brown trout population dynamics. Also, data were compiled as inputs for a model to simulate population dynamics and species interactions among brown trout, rainbow trout, and humpback chub in the Colorado River.

Date published: April 27, 2018

North American Breeding Bird Survey Dataset

The North American Breeding Bird Survey dataset contains avian point count data for more than 700 North American bird taxa (species, races, and unidentified species groupings).  These data are collected annually during the breeding season, primarily June, along thousands of randomly established roadside survey routes in the United States and Canada.

Date published: April 13, 2018

DATA RELEASE & MODEL - Continuous Detection PIT Array - Data & Model

These data represent a set of capture histories of rainbow trout captured in the Colorado River and(or) detected on the multiplexer array in the Little Colorado River.

Date published: April 6, 2018

DATA RELEASE - Remote sensing derived maps of tamarisk (2009) and beetle impacts (2013) along 412 km of the Colorado River in the Grand Canyon, Arizona - Data

These data are aerial image-derived, classification maps of tamarisk in a riparian zone of the Colorado River. Two maps are published: 1) a classification of tamarisk from a 0.2 m resolution multispectral image dataset acquired in May 2009, and 2) a classification of tamarisk impacted by the tamarisk beetle from a 0.2 m resolution multispectral image dataset acquired in May 2013.

Date published: April 5, 2018

DATA RELEASE - Landscape-scale wildlife species richness metrics - Data

These raster data represent the results of a case study in Arizona on how vertebrate richness metrics can be used with existing state and federal guidance in wind and solar energy facility siting. Each of the four geodatabases contain eight native terrestrial wildlife group models in Arizona: all vertebrates, amphibians, reptiles, birds, mammals, bats, raptors and long-distance migratory birds...

Date published: March 13, 2018

Wildlife Health Information Sharing Partnership – event reporting system (WHISPers)

The NWHC developed the Wildlife Health Information Sharing Partnership – event reporting system (WHISPers) to increase public awareness of wildlife disease events and promote collaboration and data sharing among wildlife professionals. It is a partner driven tool that provides a dynamic, timely, searchable web-based system for visualizing and accessing data on wildlife disease events...

Date published: March 13, 2018

DATA RELEASE - Laboratory experiment data—turbidity response to increasing silt and clay concentration-Data

These data were compiled during a laboratory experiment showing the turbidity response to increasing silt and clay concentration. The sediment used for the laboratory experiment was collected in the Grand Canyon study area, from the bank of the Little Colorado River, approximately 1 kilometer upstream from its confluence with the Colorado River.

Date published: March 7, 2018

Geospatial Data for Object-Based High-Resolution Classification of Conifers within Greater Sage-Grouse Habitat across Nevada and a Portion of Northeastern California

These products were developed to provide scientific and correspondingly spatially explicit information regarding the distribution and abundance of conifers (namely, singleleaf pinyon (Pinus monophylla), Utah juniper (Juniperus osteosperma), and western juniper (Juniperus occidentalis)) in Nevada and portions of northeastern California. 

Date published: March 6, 2018

Weighted Surveillance for Detection of Chronic Wasting Disease

This application provides an easy-to-use interface for conducting weighted surveillance for chronic wasting disease (CWD) in white-tailed deer populations. The first tool called 'Design' is used for planning weighted surveillance activities. The second tool called 'Estimation' is for use after sampling for CWD detection has occurred and no positive cases were found.

Filter Total Items: 21
Date published: February 15, 2017

2016 Cooperative Research Unit Story Map

In this Year in Review report, you will find details on staffing, vacancies, research funding, and other pertinent information. You will also see snapshots of Unit projects with information on how results have been or are being applied by cooperators. That is the essence of what we do: science that matter.


Date published: September 20, 2016

The Eastern Region Initiative on the Clinch (ERIC)

The Clinch-Powell River Basins Spanning Virginia and Tennessee

Date published: March 7, 2016

Nonindigeneous Aquatic Species (NAS) Database Search

Multiple search functions: State, major drainage area (HUC2), drainage area (HUC6), drainage area (HUC8), Zebra Mussel Collections, and fact sheets.

Date published: February 17, 2016

Bsal Risk by County

Heat map of the United States showing the total relative risk of Bsal to native US salamanders based on the introduction and consequences assessment (Richgels et. al. 2016).

Date published: February 1, 2016

2015 Cooperative Research Units Story Map

The Cooperative Research Unit mission is our hallmark: meeting the actionable science needs of our cooperators, providing them technical guidance and assistance in interpreting and applying new advances in science, and developing the future workforce through graduate education and mentoring. 

Date published: September 2, 2014

Species On Lands Affected by Renewables (SOLAR)

Multiple large scale solar, wind, and geothermal energy development projects are currently proposed across the Mojave and Sonoran deserts of the southwestern U.S., and these development needs are likely to continue or increase into the future. Agencies tasked with managing biological resources must understand the potential impacts in order to select appropriate sites and to mitigate effects. 

Date published: April 22, 2012

Extinct Taxa in States/Provinces of North America (2012)

Extinct Taxa in States/Provinces of North America (2012)

Date published: April 22, 2012

Extinct Taxa in Ecoregions of North America (2012)

Extinct Taxa in Ecoregions of North America (2012)

Date published: April 22, 2008

Numbered Ecoregions of North America (2008)

Numbered Ecoregions of North America (2008)

Filter Total Items: 4,609
Year Published: 2019

Phylogeography and evolution of infectious hematopoietic necrosis virus in China

Infectious hematopoietic necrosis virus (IHNV) is a well-known rhabdoviral pathogen of salmonid fish. In this study, a comprehensive analysis of 40 IHNV viruses isolated from thirteen fish farms in nine geographically dispersed Chinese provinces during 2012 to 2017 is presented. Identity of nucleotide and amino acid sequences among all the...

Xu, Liming; Zhao, Jingzhuang; Liu, Miao; Kurath, Gael; Breyta, Rachel B.; Ren, Guangming; Yin, Jiasheng; Liu, Hongbai; Lu, Tongyan

Year Published: 2019

Occupancy models for citizen-science data

Large‐scale citizen‐science projects, such as atlases of species distribution, are an important source of data for macroecological research, for understanding the effects of climate change and other drivers on biodiversity, and for more applied conservation tasks, such as early‐warning systems for biodiversity loss.However, citizen‐science data...

Altwegg, Res; Nichols, James D.

Year Published: 2019

Estimating uncertainty of North American landbird population sizes

An important metric for many aspects of species conservation planning and risk assessment is an estimate of total population size. For landbirds breeding in North America, Partners in Flight (PIF) generates global, continental, and regional population size estimates. These estimates are an important component of the PIF species assessment process...

Stanton, Jessica C.; Blancher, Peter J.; Rosenberg, Kenneth V.; Panjabi, Arvind O.; Thogmartin, Wayne E.

Year Published: 2019

Water column nutrient processing rates in rivermouths of Green Bay (Lake Michigan)

Understanding the quantity and form of nutrient loads to large lakes is necessary to understand controls over primary production, phytoplankton community composition and the production of phytotoxins. Nutrient loading estimates to large lakes are primarily made at stream gages that are deliberately placed outside the direct influence of lake...

Larson, James H.; Evans, Mary Anne; Fitzpatrick, Faith A.; Frost, Paul C.; Bailey, Sean; Kennedy, Robert J.; James, William F.; Richardson, William B.; Reneau, Paul C.

Year Published: 2019

Simulating demography, genetics, and spatially explicit processes to inform reintroduction of a threatened char

The success of species reintroductions can depend on a combination of environmental, demographic, and genetic factors. Although the importance of these factors in the success of reintroductions is well‐accepted, they are typically evaluated independently, which can miss important interactions. For species that persist in metapopulations, movement...

Mims, Meryl C.; Day, Casey C.; Burkhart, Jacob J.; Fuller, Matthew R.; Hinkle, Jameson; Bearlin, Andrew; Dunham, Jason B.; DeHaan, Patrick W.; Holden, Zachary A.; Landguth, Erin L.

Year Published: 2019

River‐valley morphology, basin size, and flow‐event magnitude interact to produce wide variation in flooding dynamics

Inundation dynamics are a key driver of ecosystem form and function in river‐valley bottoms. Inundation itself is an outcome of multi‐scalar interactions and can vary strongly within and among river reaches. As a result, establishing to what degree and how inundation dynamics vary spatially both within and among river reaches can be challenging....

Van Appledorn, Molly; Baker, Matthew E.; Miller, Andrew J.

Year Published: 2019

Economical environmental sampler designs for detecting airborn spread of fungi responsible for rapid `Ōhi` death

We designed two new samplers for monitoring airborne particulates that rely on either natural wind currents (Passive Environmental Sampler) or a battery-operated fan (Active Environmental Sampler). Both samplers are significantly less expensive than commercial devices such as Rotorod® and Burkard Samplers that are used in the agricultural and...

Atkinson, Carter T.; Roy, Kylle; Granthon, Carolina

Year Published: 2019

Effects of flood inundation, invasion by Phalaris arundinacea, and nitrogen enrichment on extracellular enzyme activity in an Upper Mississippi River floodplain forest

The community structures and ecosystem functions of floodplains are primarily driven by variation in flood inundation. However, global changes, such as invasive species and nutrient enrichment, may alter the effects of flooding in these systems. We added nitrogen (N) to correspond with twice the annual atmospheric deposition rate of the south-west...

De Jager, Nathan R.; Swanson, Whitney; Hernandez, Daniel L.; Reich, Julia; Erickson, Richard A.; Strauss, Eric A.

Year Published: 2019

A vision for documenting and sharing knowledge in conservation

As editors, we mark the launch of Conservation Science and Practice, a journal of the Society for Conservation Biology (SCB), with the following remarks framing the purpose and aspirations of the journal. Our aim is to share scholarship on and experiences of the practice of conservation. We define conservation practice as the application of...

Schwartz, Mark W.; Belhabib, Dyhia; Biggs, Duan; Cook, Carly N.; Fitzsimmons, James; Giordano, Anthony J.; Glew, Louise; Gottlieb, Sara; Kattan, Gustavo; Knight, Andrew T.; Lundquist, Carolyn J.; Lynam, Antony J.; Masuda, Yuta J.; Mwampamba, Tuyeni H.; Nuno, Ana; Plumptre, Andrew J.; Ray, Justina C.; Reddy, Sheila M.; Runge, Michael C.

Year Published: 2019

The missing dead: The lost role of animal remains in nutrient cycling in North American Rivers

While leaf litter, wood, and other plant remnants are known to play a central role in lotic ecosystems, animal remains (carcasses, bones, shells) have received less attention. We propose a simple classification scheme for animal remains in rivers based on origin (authochthonous vs. allochthonous) and frequency (pulsed vs continuous). We then...

Wengerd, Seth J.; Subalusky, Amanda L.; Freeman, Mary C.

Year Published: 2019

Compounding effects of climate change reduce population viability of a montane amphibian

Anthropogenic climate change presents challenges and opportunities to the growth, reproduction, and survival of individuals throughout their life cycles. Demographic compensation among life‐history stages has the potential to buffer populations from decline, but alternatively, compounding negative effects can lead to accelerated population decline...

Kissel, Amanda M.; Palen, Wendy J.; Ryan, Maureen E.; Adams, Michael J.

Year Published: 2019

Evaluating response distances to develop buffer zones for staging terns

Buffer zones, calculated by flight‐initiation distance (FID), are often used to reduce anthropogenic disturbances to wildlife, but FID can vary significantly across life‐history stages. We examined the behavioral effect of potential natural (gulls and shorebirds) and anthropogenic (pedestrians) disturbance sources to staging roseate (Sterna...

Althouse, Melissa A.; Cohen, Jonathan B.; Karpanty, Sarah M.; Spendelow, Jeffrey A.; Davis, Kayla L.; Parsons, Katherine C.; Luttazi, Cristin F.

Filter Total Items: 689
Juvenile salt marsh harvest mouse
December 31, 2018

Juvenile Salt Marsh Harvest Mouse (Reithrodontomys raviventris)

USGS wildlife biologists holding a juvenile salt marsh harvest mouse (Reithrodontomys raviventris). The species is listed as "endangered" under the Endangered Species Act of 1973.

Image collage of USGS Ecosystems Mission Area scientists in the field.
December 31, 2018

Image collage of USGS Ecosystems Mission Area scientists in the field.

Image collage of USGS Ecosystems Mission Area scientists in the field. 

Top left – little brown bat with white-nose syndrome, USGS scientists with invasive python in the Everglades, male Laysan Duck.
Middle left – Greater sage-grouse, USGS scientist sampling in Glacier National Park, USGS scientist sampling a frog for chytrid fungus.
Lower left – Black and

Attribution: Ecosystems
USGS presentation title slide for GenEst, A Generalized Estimator of Mortality
December 21, 2018

Slide 1 26Nov2018 NWCC GenEst Workshop

Opening slide for the Intro to GenEst, A Generalized Estimator of Mortality, Workshop held at the National Wind Coordinating Collaborative's Wind Wildlife Research Meeting XII on November 26, 2018 in St. Paul Minnesota. https://www.nationalwind.org/meetings/wind-wildlife-research-meeting-

Outstanding in the field podcast album art
December 10, 2018

Outstanding in the Field (Ep 1): To Bee or Not to Bee

The USGS Ecosystems Mission Area brings you Outstanding in the Field, a series of stories about our science, our adventures, and our efforts to better understand our fish and wildlife and the ecosystems that support them. This episode's buzz is all about pollinators, the birds, bees, bats, beetles, and other animals that feed on pollen from plants and help bring about one

December 8, 2018

Burrowing Owl at LAX Dunes Preserve

A burrowing owl, captured by a wildlife camera, standing next to the enterence of its den.

Manatee Health Assessment
December 6, 2018

Manatee Health Assessment

USGS conducts a health assessment on a mantee in Crystal River, Florida.

Four pits filled with water.
November 5, 2018

RestoreNet treatments

RestoreNet locations are testing commonly used restoration techniques, including pitting, mulching, and above-ground micro sites. Here, pits have filled with water, illustrating how this technique increases soil moisture by capturing rainwater. The project will illustrate which techniques work to establish plants depending on local conditions (like soil type) and climate

Wire crosses, called ConMods installed at a RestoreNet site.
November 5, 2018

RestoreNet treatments

RestoreNet locations are testing commonly used restoration techniques, including pitting, mulching, and above-ground micro sites. Here, metal crosses create an above-ground microsite that can increase soil moisture by providing shade and collecting debris under some conditions. The project will illustrate which techniques work to establish plants depending on local

Mulch treatment
November 5, 2018

RestoreNet treatments

RestoreNet locations are testing commonly used restoration techniques, including pitting, mulching, and above-ground micro sites. This photo shows the mulching treatment, which can increase soil moisture and lead to higher plant survival under some conditions. The project will illustrate which techniques work to establish plants depending on local conditions (like soil

A broken foundation where the Cape San Blas house stood
November 4, 2018

A broken slab is all that's left of Fish Inn after Hurricane Michael

A broken concrete foundation and some shattered floor tiles were all that remained of the sea turtle researchers' field station and home base after Category Four Hurricane Michael struck Cape San Blas on Oct. 10, 2018.

Pacific fisher on a tree looking into a bait box
October 24, 2018

Pacific fisher trying to grab a chicken dinner from the bait box

USGS scientists are documenting the distribution of three mid-sized mammalian carnivores – or mesocarnivores –in the Klamath Network Parks using remote cameras and hair snares. Little is known about the status of Pacific fishers, Pacific martens, and Sierra Nevada red foxes living in the Klamath Network, which include Crater Lake National Park, Lassen Volcanic National

graphic of N and S deposition and annual temp and precipitation from Horn, et al. (2018)
October 18, 2018

Figure 1, Horn, et al. (2018)

Gradients of N deposition, S deposition, mean annual temperature, and mean annual precipitation across the conterminous U.S. Panels are the a) mean total N deposition from 2000–2012, b) mean total S deposition from 2000–2012, c) mean annual temperature from 2000–2014, and d) mean annual precipitation form 2000–2014. Deposition data are from the TDEP product [23] and

Filter Total Items: 284
Date published: July 2, 2018

Born in a Los Angeles zoo, released into the San Gabriels, a rare frog bounces back (The LA Times)

SAN GABRIEL MOUNTAINS, CA — Last week, biologists from the USGS Western Ecological Research Center (WERC) and partnering agencies released hundreds of endangered, mountain yellow-legged frog tadpoles back to their historic habitat in southern California.

Date published: June 19, 2018

New Approach May Detect Chronic Wasting Disease Earlier, at Less Cost

A new statistical approach to disease surveillance may improve scientists’ and managers’ ability to detect chronic wasting disease earlier in white-tailed deer by targeting higher-risk animals. This approach can also provide financial and personnel savings for agencies that are required to monitor for wildlife diseases, including the National Park Service, or NPS. 

Date published: June 18, 2018

It’s National Pollinator Week! Get the buzz on USGS pollinator research

Bees, birds, butterflies, bats and beetles provide vital but often invisible pollination services that support terrestrial wildlife and plant communities, and healthy watersheds.

Attribution: Ecosystems
Date published: May 31, 2018

USGS Hurricane Response Met Challenges in 2017, Prepares for 2018

No one has a crystal ball to foresee what will happen during the 2018 hurricane season that begins June 1, but NOAA forecasters say there’s a 75 percent chance this hurricane season will be at least as busy as a normal year, or busier.

Date published: May 25, 2018

USGS Fish Passage Research Helps Fish Get to Spawning Grounds

The Blackstone River in Rhode Island is where one of the Nation’s first fish passages was built back in 1714 to help fish navigate past manmade obstructions so they could complete their instinctual migration cycles.

Date published: May 21, 2018

Scientists Collecting Bird Data on Grasslands in Montana this Spring

Now through late July, 2018, U.S. Geological Survey scientists will conduct fieldwork on public lands in Phillips and Valley counties near Malta and Glasgow, Montana, as part of a grassland bird project.

Date published: April 25, 2018

Invasive Cuban Treefrogs Leap Out of Florida, Establish First Known Population in Louisiana

A population of exotic invasive Cuban treefrogs has been discovered in New Orleans, more than 430 miles (700 kilometers) from the nearest known population in Florida, making this the first known breeding population in the mainland United States outside that state, reports a new study by the U.S. Geological Survey. 

Scroll down to hear and download calls of Cuban treefrogs and two native treefrogs.

Date published: April 13, 2018

A Day in the Life of a WERC Seabird Scientist

In the featured photo, WERC scientists search for potential nesting habitat of seabirds like the Ashy Storm-Petrel (Oceanodroma homochroa) on False Klamath Rock off the coast of California.

Date published: April 11, 2018

NOROCK Scientist Receives USGS Award for Lifetime Achievement in Science Communications

Research Ecologist Dan Fagre is the recipient of the 2017 Eugene M. Shoemaker Award for Lifetime Achievement in Communications

Date published: March 29, 2018

New Control Methods Can Help Protect Coral Reefs from Invasive Species

Honolulu, Hawaii – Control efforts such as the removal of shipwrecks and application of chlorine may help mitigate the damaging effects of corallimorph, which is a type of invasive anemone, on valuable coral reefs in the Central Pacific Ocean, according to a new U.S. Geological Survey study.

Date published: March 19, 2018

New genetic test detects manatees' recent presence in fresh or saltwater

Environmental DNA picks up traces of the elusive mammals’ saliva, skin, waste, or exhaled breaths.