Wetland and Aquatic Research Center

Genetics/Genomics

The long-term viability of species and populations is related to their potential to migrate, reproduce, and adapt to environmental changes. In the southeast United States, USGS WARC scientists provide resource managers with genetic information to improve the long-term survival and sustainability of the nation's aquatic species. Research focused on native and imperiled species can assess the genetic factors influencing their survival and recovery, while work on invasive species can provide information on their extent, dispersal, and potential impacts on native species.
Filter Total Items: 13
Date published: October 12, 2016
Status: Active

Manatee Health Assessment and Biomedical Studies

A multi-agency effort assesses the health of manatees and provides baseline information on their health, reproductive status, and nutritional condition.

Date published: June 16, 2016

Statistical Models for the Design and Analysis of Environmental DNA (eDNA) Surveys of Invasive and Imperiled Species

Detecting invasive species at low densities or prior to population establishment is critical for successful control and eradication. For example, Burmese pythons occupy thousands of square kilometers of mostly inaccessible habitats.

Date published: May 26, 2016

Flow Cytometry Applied to the Animal Kingdom in Studies of Natural Resource Science

Flow cytometry is a technique for rapidly analyzing large numbers of animal cells using light-scattering, fluorescence, and absorbance measurements.

Date published: April 29, 2016

A Novel Technique to Control Invasive Species – Trojan Y

In this project, USGS scientists are developing a new genetic technique – Trojan Y – to help eradicate invasive species. Although the methodology has been well-developed in theory, this is the first test of its practical application.

Date published: April 26, 2016

Trojan Y Invasive Species Control - Sex Marker Identification

To control or possibly eliminate non-native species without harm to native fauna, a genetic technique using sex-reversed females with two Y chromosomes (Trojan Y) is being developed to reduce the breeding success of the species, ultimately resulting in population decline or loss.

Date published: April 17, 2016

Developing a Largemouth Bass Hybrid Strain for Mapping Genome Linkage

The largemouth bass is a highly managed sport fish. Detailed genetic information on the fish at the gene level can provide researchers insight into genomic control of phenotypic expression of life-history traits, core physiological functions, and other aspects of biology. 

Date published: April 16, 2016

Determining the Ploidy and Resultant Reproductive Capability of Artificially Spawned and Wild Caught Asian Carp

The invasive grass carp and black carp are artificially spawned to produce triploids, which means they have three sets of chromosomes and are sterile. WARC scientists invented an early ploidy prediction process for produced fry, and a post-mortem assessment method for carp caught either in the wild or sold and hauled live to other states. 

Date published: April 16, 2016
Status: Active

Asian Tiger Shrimp Distribution and Genetics

The Asian tiger shrimp began appearing in commercial shrimp catches in 2006. They grow larger than native shrimp and are known to be fierce predators - so shrimpers and managers are concerned about the potential effects this species might have. 

Date published: April 8, 2016

Developing Detection Probabilities and Quantifying the Effects of Flowing Water to Improve Asian Carp Environmental DNA (eDNA) Surveys

Invasive Asian carp are problematic for native species, and managers are implementing control measures without well-quantified detection limits or a means to assess the accuracy and precision of existing or future survey data for the fish. Environmental DNA - eDNA - is already used to detect the presence of invasive species, and can be used to identify locations to focus carp control efforts...

Date published: April 6, 2016
Status: Active

Efficacy of eDNA as an Early Detection and Rapid Response Indicator for Burmese Pythons in the Northern Greater Everglades Ecosystem

Traditional approaches to locating Burmese pythons - including visual searches and trapping - have resulted in low detection. Environmental DNA - or eDNA - is increasingly being used to detect the presence of non-native species, particularly when traditional methods may not be adequate. 

Date published: April 6, 2016
Status: Active

Genetic Analysis of the Invasive Burmese Python to Aid Management and Population-Control Decision-Making

Invasive Burmese pythons threaten the success of Everglades restoration efforts. To assist with management and population control decision making, USGS scientists are implementing genetic studies to identify potential new entry pathways and to help quantify the size of the breeding population.

Date published: April 5, 2016

Genetic Analysis of Wild and Captive Black Carp in the Mississippi River Basin

Black carp have likely been present in the Mississippi River since the 1990s, but their current distribution and spread is not well understood. Genetics is helping to shed light on this species, including its diversity, the relatedness of wild and captive fish, and its introduction history.