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Ecosystems

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Filter Total Items: 30,699
Year Published: 2016

Long-term continuous acoustical suspended-sediment measurements in rivers - Theory, application, bias, and error

It is commonly recognized that suspended-sediment concentrations in rivers can change rapidly in time and independently of water discharge during important sediment‑transporting events (for example, during floods); thus, suspended-sediment measurements at closely spaced time intervals are necessary to characterize suspended‑sediment loads. Because...

Topping, David J.; Wright, Scott A.
Topping, D.J., and Wright, S.A., 2016, Long-term continuous acoustical suspended-sediment measurements in rivers—Theory, application, bias, and error: U.S. Geological Survey Professional Paper 1823, 98 p., http://dx.doi.org/10.3133/pp1823.

Year Published: 2016

Hydrothermal vents and methane seeps: Rethinking the sphere of influence

Although initially viewed as oases within a barren deep ocean, hydrothermal vent and methane seep communities are now recognized to interact with surrounding ecosystems on the sea floor and in the water column, and to affect global geochemical cycles. The importance of understanding these interactions is growing as the potential rises for...

Levin, Lisa A.; Baco, Amy; Bowden, David; Colaco, Ana; Cordes, Erik E.; Cunha, Marina; Demopoulos, Amanda W.J.; Gobin, Judith; Grupe, Ben; Le, Jennifer; Metaxas, Anna; Netburn, Amanda; Rouse, Greg; Thurber, Andrew; Tunnicliffe, Verena; Van Dover, Cindy L.; Vanreusel, Ann; Watling, Les
Levin, L., Baco, A., Bowden, D., Colaco, A., Cordes, E., Cunha, M., Demopoulos, A.W., Gobin, J., Grupe, B., Le, J., Metaxas, A., Netburn, A., Rouse, G., Thurber, A., Tunnicliffe, V., Van Dover, C., Vanreusel, A., and Watling, L., 2016, Hydrothermal vents and methane seeps: rethinking the sphere of influence: Frontiers in Marine Science, Online Early, v. 3, p. 72-xx, http://dx.doi.org/10.3389/fmars.2016.00072 or http://journal.frontiersin.org/article/10.3389/fmars.2016.00072/abstract.

Year Published: 2016

Vegetation of semi-stable rangeland dunes of the Navajo Nation, Southwestern USA

Dune destabilization and increased mobility is a worldwide issue causing ecological, economic, and health problems for the inhabitants of areas with extensive dune fields. Dunes cover nearly a third of the Navajo Nation within the Colorado Plateau of southwestern USA. There, higher temperatures and prolonged drought beginning in 1996 have produced...

Thomas, Kathryn A.; Redsteer, Margaret H.
Thomas, Kathryn A., and Margaret H. Redsteer. (2016). Vegetation of semi-stable rangeland dunes of the Navajo Nation, Southwestern USA. Arid Land Research and Management. Taylor and Francis online. http://www.tandfonline.com/doi/full/10.1080/15324982.2016.1138157. DOI: 10.1080/15324982.2016.1138157

Year Published: 2016

Drivers of barotropic and baroclinic exchange through an estuarine navigation channel in the Mississippi River Delta Plain

Estuarine navigation channels have long been recognized as conduits for saltwater intrusion into coastal wetlands. Salt flux decomposition and time series measurements of velocity and salinity were used to examine salt flux components and drivers of baroclinic and barotropic exchange in the Houma Navigation Channel, an estuarine channel located in...

Snedden, Gregg
Snedden, G.A., 2016, Drivers of barotropic and baroclinic exchange through an estuarine navigation channel in the Mississippi River Delta Plain: Water, v. 8, no. 5, art. 184, 15 p., http://dx.doi.org/10.3390/w8050184.

Year Published: 2016

Spatially explicit control of invasive species using a reaction-diffusion model

Invasive species, which can be responsible for severe economic and environmental damages, must often be managed over a wide area with limited resources, and the optimal allocation of effort in space and time can be challenging. If the spatial range of the invasive species is large, control actions might be applied only on some parcels of land, for...

Bonneau, Mathieu; Johnson, Fred A.; Romagosa, Christina M.
Bonneau, M., Johnson, F.A., and Romagosa, C.M., 2016, Spatially explicit control of invasive species using a reaction-diffusion model: Ecological Modelling, v. 337, p. 15-24, http://dx.doi.org/10.1016.j.ecolmodel.2016.05.013.

Year Published: 2016

Effect of diet quality on chronic toxicity of aqueous lead to the amphipod Hyalella azteca

The authors investigated the chronic toxicity of aqueous Pb to the amphipod Hyalella azteca (Hyalella) in 42-d tests using 2 different diets: 1) the yeastþcereal leafþtrout pellet (YCT) diet, fed at the uniform low ration used in standard methods for sediment toxicity tests; and 2) a new diet of diatomsþTetraMin flakes (DT), fed...

Besser, John M.; Ivey, Chris D.; Brumbaugh, William G.; Ingersoll, Christopher G.
Besser, J.M., Ivey, C.D., Brumbaugh, W.G., and Ingersoll, C.G., 2016, Effect of Diet Quality on Chronic Toxicity of Aqueous Lead to the Amphipod Hyalella azteca: Environmental Toxicology and Chemistry 35(7), 1825–1834

Year Published: 2016

Molecular evidence of undescribed Ceratonova sp. (Cnidaria: Myxosporea) in the freshwater polychaete, Manayunkia speciosa, from western Lake Erie

We used PCR to screen pooled individuals of Manayunkia speciosa from western Lake Erie, Michigan, USA for myxosporean parasites. Amplicons from positive PCRs were sequenced and showed a Ceratonova species in an estimated 1.1% (95% CI = 0.46%, 1.8%) of M. speciosa individuals. We sequenced 18S, ITS1, 5.8S, ITS2...

Malakauskas, David M.; Snipes, Robert Benjamin; Thompson, Ann M.; Schloesser, Donald W.

Year Published: 2016

Improve wildlife species tracking—Implementing an enhanced global positioning system data management system for California condors

U.S. Fish and Wildlife Service (USFWS) staff in the Pacific Southwest Region and at the Hopper Mountain National Wildlife Refuge Complex requested technical assistance to improve their global positioning system (GPS) data acquisition, management, and archive in support of the California Condor Recovery Program. The USFWS deployed and maintained...

Waltermire, Robert G.; Emmerich, Christopher U.; Mendenhall, Laura C.; Bohrer, Gil; Weinzierl, Rolf P.; McGann, Andrew J.; Lineback, Pat K.; Kern, Tim J.; Douglas, David C.
Waltermire, R.G., Emmerich, C.U., Mendenhall, L.C., Bohrer, Gil, Weinzierl, R.P., McGann, A.J., Lineback, P.K., Kern, T.J., and Douglas, D.C., 2016, Improve wildlife species tracking—Implementing an enhanced global positioning system data management system for California condors: U.S. Geological Survey Open-File Report 2016–1030, 46 p., http://dx.doi.org/10.3133/ofr20161030.

Year Published: 2016

Flow management for hydropower extirpates aquatic insects, undermining river food webs

Dams impound the majority of rivers and provide important societal benefits, especially daily water releases that enable on-peak hydroelectricity generation. Such “hydropeaking” is common worldwide, but its downstream impacts remain unclear. We evaluated the response of aquatic insects, a cornerstone of river food webs, to hydropeaking...

Kennedy, Theodore A.; Muehlbauer, Jeffrey D.; Yackulic, Charles B.; Lytle, D.A.; Miller, S.A.; Dibble, Kimberly L.; Kortenhoeven, Eric W.; Metcalfe, Anya; Baxter, Colden V.
Kennedy, T.A., Muehlbauer, J.D., Yackulic, C.B., Lytle, D.A., Miller, S.W., Dibble, K.L., Kortenhoeven, E.W., Metcalfe, A.M., and Baxter, C.V., 2016, Flow Management for Hydropower Extirpates Aquatic Insects, Undermining River Food Webs: Bioscience, online, http://bioscience.oxfordjournals.org/content/early/2016/04/30/biosci.biw059.

Year Published: 2016

Hydrologic exchanges and baldcypress water use on deltaic hummocks, Louisiana, USA

Coastal forested hummocks support clusters of trees in the saltwater–freshwater transition zone. To examine how hummocks support trees in mesohaline sites that are beyond physiological limits of the trees, we used salinity and stable isotopes (2H and 18O) of water as tracers to understand water fluxes in hummocks and uptake by baldcypress (...

Hsueh, Yu-Hsin; Chambers, Jim L.; Krauss, Ken W.; Allen, Scott T.; Keim, Richard F.
Hsueh, Y.-H., Chambers, J.L., Krauss, K.W., Allen, S.T., and Keim, R.F., 2016, Hydrologic exchanges and baldcypress water use on deltaic hummocks, Louisiana, USA: Ecohydrology (2016) Early View, http://dx.doi.org/10.1002/eco.1738.

Year Published: 2016

Female gonadal hormones and reproductive behaviors as key determinants of successful reproductive output of breeding whooping cranes (Grus americana)

Reproductive success of endangered whooping cranes (Grus americana) maintained ex situ is poor. As part of an effort to identify potential causes of poor reproductive success in a captive colony, we used non-invasive endocrine monitoring to assess gonadal and adrenal steroids of bird pairs with various reproductive outcomes and evaluated...

Brown, Megan E; Converse, Sarah J.; Chandler, Jane N.; Shafer, Charles; Brown, Janine L; Keefer, Carol L; Songsasen, Nucharin
Brown, M. E., Converse, S. J., Chandler, J. N., Shafer, C., Brown, J. L., Keefer, C. L., and Songsasen, N., 2016, Female gonadal hormones and reproductive behaviors as key determinants of successful reproductive output of breeding Whooping Cranes (Grus americana): General and Comparative Endocrinology, v. 230-231, p. 158-165.

Year Published: 2016

Developing population models with data from marked individuals

Population viability analysis (PVA) is a powerful tool for biodiversity assessments, but its use has been limited because of the requirements for fully specified population models such as demographic structure, density-dependence, environmental stochasticity, and specification of uncertainties. Developing a fully specified population model from...

Hae Yeong Ryu; Kevin T. Shoemaker; Eva Kneip; Anna Pidgeon; Patricia Heglund; Brooke Bateman; Thogmartin, Wayne E.; Reşit Akçakaya
Ryu, H.R., Shoemaker, K.T., Kneip, E., Pidgeon, A.M., Heglund, P.J., Bateman, B.L., Thogmartin, W.E., Akçakaya, H.R. 2016. Developing population models with data from marked individuals. Biological Conservation. Vol. 197:190-199. DOI: 10.1016/j.biocon.2016.02.031.