Wetland and Aquatic Research Center

Publications

Explore WARC's science publications.

Filter Total Items: 2,613
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Year Published: 2021

U.S. Geological Survey invasive species research—Improving detection, awareness, decision support, and control

More than 6,500 nonindigenous species are now established in the United States, posing risks to human and wildlife health, native plants and animals, and our valued ecosystems. The annual environmental, economic, and health-related costs of invasive species are substantial. Invasive species can drive native species onto the endangered species list...

Tam, Cindy Kolar; Daniel, Wesley M.; Campbell, Earl; English, James J.; Soileau, Suzanna C.
Tam, C.K., Daniel, W.M., Campbell, E., English, J.J., and Soileau, S.C., 2021, U.S. Geological Survey invasive species research—Improving detection, awareness, decision support, and control: U.S. Geological Survey Circular 1485, 28 p., https://doi.org/10.3133/cir1485.

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Year Published: 2021

Environmental DNA surveys of Burmese pythons in the Greater Everglades Ecosystem

Improving the probability of detecting invasive giant snakes is vital for the management of emerging or established populations. Burmese pythons occupy thousands of square kilometers of mostly inaccessible habitats in Florida. Environmental DNA (eDNA) methods have been shown to be time and cost effective in a number of systems and may be...

Beaver, Caitlin E.; Meigs-Friend, Gaia; Hunter, Margaret E.
Beaver, C.E., Meigs-Friend, G., and Hunter, M.E., 2021, Environmental DNA surveys of Burmese pythons in the Greater Everglades Ecosystem: U.S. Geological Survey Open-File Report 2021–1082, 17 p., https://doi.org/10.3133/ofr20211082.

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Year Published: 2021

Establishment of baseline cytology metrics in nestling American kestrels (Falco sparverius): Immunomodulatory effects of the flame retardant isopropylated triarylphosphate isomers

Avian populations must mount effective immune responses upon exposure to environmental stressors such as avian influenza and xenobiotics. Although multiple immune assays have been tested and applied to various avian species, antibody-mediated immune responses in non-model avian species are not commonly reported due to the lack of commercially...

Jenkins, Jill; Baudoin, Brooke A; Johnson, Darren; Fernie, Kim J.; Stapelton, Heather M.; Karouna-Renier, Natalie K.

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Year Published: 2021

First record of Najas marina (Hydrocharitaceae) for Montana and an update on the North American distribution

Three recent collections of Najas marina (spiny water-nymph) from Missoula County, Montana are documented and illustrated. These collections are the first records for Montana and for the Pacific Northwest region. The occurrence of N. marina in Montana reflects a significant northward expansion of this species in the Mountain West. The North...

Freeman, Scott L.; Pfingsten, Ian

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Year Published: 2021

A protocol for modelling generalised biological responses using latent variables in structural equation models

In this paper we consider the problem of how to quantitatively characterize the degree to which a study object exhibits a generalized response. By generalized response, we mean a multivariate response where numerous individual properties change in concerted fashion due to some internal integration. In latent variable structural equation modeling (...

Akomolafe, Gbenga; Grace, James; Steiner, Magdalena

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Year Published: 2021

Instrumental variable methods in structural equation models

Instrumental variable regression (RegIV) provides a means for detecting and correcting parameter bias in causal models. Widely used in economics, recently several papers have highlighted its potential utility for ecological applications. Little attention has thus far been paid to the fact that IV methods can also be implemented within structural...

Morrissey, Michael; Grace, James

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Year Published: 2021

Extreme precipitation and flooding contribute to sudden vegetation dieback in a coastal salt marsh

Climate extremes are becoming more frequent with global climate change and have the potential to cause major ecological regime shifts. Along the northern Gulf of Mexico, a coastal wetland in Texas suffered sudden vegetation dieback following an extreme precipitation and flooding event associated with Hurricane Harvey in 2017. Historical salt marsh...

Stagg, Camille; Osland, Michael; Moon, Jena A.; Feher, Laura; Laurenzano, Claudia; Lane, Tiffany C.; Jones, William; Hartley, Stephen

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Year Published: 2021

First documentation of long-distance travel by a Florida manatee to the Mexican Caribbean

West Indian manatees (Trichechus manatus) are separated into two allopatric subspecies: the Florida manatee (T. m. latirostris) and the Antillean manatee (T. m. manatus). In the winter of 2020–2021, an adult manatee was sighted off the coast of Cancun, Quintana Roo, Mexico, in areas where Antillean manatees are not typically seen. The individual...

Castelblanco-Martínez, Nataly; Álvarez-Alemán, Anmari; Torres, Raul; Teague, Amy L.; Barton, Sheri; Rood, Kari A; Ramos, Eric A; Mignucci-Giannoni, Antonio A.

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Year Published: 2021

Gopherus polyphemus (Gopher Tortoise) adult mortality

Gopherus polyphemus has typically high adult survivorship, with some populations reaching a mean annual survivorship of 93.4% (Howell et al. 2019. J. Wildl. Manage. 84:56–65). Instances of adult mortality are not commonly reported outside of large mortality events, and most often result from disease, starvation, dehydration, or chronic stress (...

Palandri, Michael; Lamont, Margaret

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Year Published: 2021

Watershed and estuarine controls both influence plant community and tree growth changes in tidal freshwater forested wetlands along two U.S. mid-Atlantic rivers

The tidal freshwater zone near the estuarine head-of-tide is potentially sensitive to both sea-level rise and associated salinity increases as well as changing watershed inputs of freshwater and nutrients. We evaluated the vegetation response of tidal freshwater forested wetlands (TFFW) to changes in nontidal river versus estuarine controls along...

Noe, Gregory B.; Bourg, Norman A; Krauss, Ken; Duberstein, Jamie A.; Hupp, Cliff R.

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Year Published: 2021

Using ALOS-2 synthetic aperture radar (SAR) and interferometric SAR to detect landslides on the mountainous island of Pohnpei, Federated States of Micronesia

This study was undertaken by the U.S. Geological Survey to assess the detectability of landslides in the densely forested and mountainous island of Pohnpei in the Federated States of Micronesia. The study used existing field-observed land-cover changes and landslides visible on Google Earth (GE) images. A limited number of ALOS-2 PALSAR-2 L-band...

Ramsey III, Elijah W.; Rangoonwala, Amina
Ramsey, E.W., III, and Rangoonwala, A., 2021, Using ALOS-2 synthetic aperture radar (SAR) and interferometric SAR to detect landslides on the mountainous island of Pohnpei, Federated States of Micronesia: U.S. Geological Survey Open-File Report 2021–1084, 28 p., https://doi.org/10.3133/ofr20211084.

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Year Published: 2021

Genetic diversity of immature Kemp's ridley (Lepidochelys kempii) sea turtles from the northern Gulf of Mexico

The Kemp’s ridley (Lepidochelys kempii) is the world’s most endangered sea turtle species. Predominately nesting at only one beach in Mexico, this species declined to an estimated 300 females in the mid-1980s. Conservation efforts in the United States and Mexico, including a head start programme in southern Texas in which hatchlings were reared in...

Lamont, Margaret; Moreno, Nickolas; Camacho-Sanchez, Fatima Y.; Acosta-Sanchez, H. Hugo; Glaberman, Scott; Reyes-Lopez, Miguel A.; Chiari, Ylenia