Southwest Biological Science Center

Nonnative Species

Filter Total Items: 19
Date published: June 22, 2019
Status: Active

Managing for Grassland Health at Buenos Aires National Wildlife Refuge

Southern Arizona’s semi-desert grasslands provides habitat for flora and fauna, regulates rainfall infiltration and overland flow, mitigates surface erosion and dust production, and sequesters carbon. Sustainable management is important to maintain these ecological services and is of concern for the managers, ranchers, and other people associated with the grassland. The Buenos Aires National...

Date published: June 11, 2019
Status: Active

GCMRC Online Maps

The Grand Canyon Monitoring and Research Center maintains an enterprise GIS platform built upon ESRI ArcGIS Server and Portal applications.  This enterprise system allows for spatial data, maps and analytical tools to be served through online applications.  The Geospatial Science and Technology project provides access to this content through different avenues.  Online maps can be accessed...

Date published: June 11, 2019
Status: Active

GCMRC Data Releases

Data releases made available by GCMRC can be found here as they are published via the USGS Fundamental Science Practices (FSPs).  Individual science product links will take users to the USGS ScienceBase website for each entry.

 

Click on Data and Tools Tab to see list of Data Releases.

Date published: April 24, 2019
Status: Active

Grand Canyon Monitoring and Research Projects

The Grand Canyon Monitoring and Research Center currently functions under a Triennial Work Plan (TWP) which is thoroughly reviewed and vetted both internally within the Center and through the GCDAMP Technical Work Group (TWG) and the Adaptive Management Work Group (AMWG).  These advisory panels have been a part of the Glen Canyon Dam...

Date published: August 5, 2017
Status: Active

RestoreNet: Distributed Field Trial Network for Dryland Restoration

Recovery from disturbance represents a substantial challenge to agencies that manage large tracts of land in the Southwest. Despite the demand for restoration and rehabilitation, little information is available to help managers effectively reestablish native perennial vegetation and stabilize soils, especially given changing climate and disturbance regimes.

Forestry and agriculture have...

Contacts: Molly McCormick, Seth Munson, Brad Butterfield, Elise Gornish
Date published: May 14, 2017
Status: Active

Rainbow Trout Abundance and Movement in the Colorado River in Grand Canyon

Just below Glen Canyon Dam on the Colorado River is a very popular Blue Ribbon trout fishery known for its rainbow trout. However, approximately 78 miles downstream, near were the Little Colorado River flows into the Colorado River, is a population of endangered humpback chub. The introduced rainbow trout can negatively affect native humpback chub by competing with them for food (immature...

Contacts: Charles Yackulic, Josh Korman
Date published: February 13, 2017

Predicting the Next High-Impact Insect Invasion

Although most introduced insects are relatively benign, some become high-impact pests causing widespread ecological and economic damage. Introduced insects that are specialists and feed on a single genus of plants can be high-impact as they can potentially eliminate an entire native plant genus over large areas. Luckily, most introduced insects with this feeding behavior do not become high-...

Date published: December 30, 2016

Southwestern Riparian Zones, Tamarisk Plants, and the Tamarisk Beetle

Introductions of bio-control beetles (genus Diorhabda) are causing defoliation and dieback of exotic Tamarix spp. in riparian zones across the western U.S., yet the factors that determine the plant communities that follow Tamarix decline are poorly understood. In particular, Tamarix-dominated soils are often higher in nutrients, organic matter, and salts than nearby soils, and these soil...

Date published: December 23, 2016
Status: Active

Population Dynamics of Endangered Humpback Chub in Grand Canyon

Construction of Glen Canyon Dam has led to large changes in environmental conditions of the downriver Colorado River. Whereas the pre-dam Colorado River experienced large seasonal variation in temperature and discharge and was highly turbid, the post-dam Colorado River is far less variable in terms of temperature and discharge and is frequently clear. Many nonnative fish species had already...

Date published: December 23, 2016
Status: Active

Understanding Factors Influencing Rainbow Trout Growth in the Colorado River

Rainbow trout is a desirable sport fish that has been introduced in many locations around the world. Although introductions of rainbow trout and other nonnative fishes provide recreational fishing opportunities, they also pose threats to native fish populations. The Glen Canyon Dam Adaptive Management Program has tasked scientists and managers with identifying management options that allow...

Date published: December 21, 2016
Status: Active

Effects of Water Clarity on Survival of Endangered Humpback Chub

Introduced rainbow trout and brown trout are considered a threat to the endangered humpback chub in the Colorado River in Grand Canyon. These introduced species eat native fish, but impacts are difficult to assess because predation vulnerability depends on the physical conditions under which predation takes place. We studied how predation vulnerability of juvenile humpback chub changes in...

Contacts: David Ward
Date published: December 20, 2016
Status: Active

Riparian Remote Sensing in the Colorado River and Grand Canyon Region

Riparian vegetation has increased dramatically along the Colorado River downstream of Glen Canyon Dam since the closure of the dam in 1963. The spatial patterns and temporal rates of vegetation increase occur due to changes in river hydrology, dam operations, and climate. The increase in vegetation, particularly onto otherwise bare sandbars, has impacted recreational, geomorphological,...