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Direct density-dependence through intraspecific competition may be an important mechanism permitting sustained herbivore outbreaks. In theory, interference competition could allow a relatively stable number of herbivore individuals to survive while moderating host plant damage. This research examined the potential role of intraspecific competition in permitting a decade-long outbreak of the aspen leaf miner, Phyllocnistis populiella, on Populus tremuloides in interior Alaska. A combination of observational and experimental studies examined larval food requirements, food resources, and the impacts of P. populiella larval density on survival, mass, and leaf mining damage. These results were then compared to those...
An atlas detailing state and provincial distributions of 663 North American Ephemeroptera species is presented. Biogeographic affinities of 95 North American genera are discussed and their hypothesized origins reviewed. Historical events in regards to vicariance and dispersal were important factors influencing the evolution of the North American fauna. Lineages found in North America are a result of Northern Hemisphere vicariant events (e.g., plate tectonics) and periods of dispersalist invasion, notably via the Isthmus of Panama and Beringia. The North American fauna is composed predominantly of Nearctic endemics/relicts, and lineages with Laurasian or Neotropical affinities. Although Cloeodes and Ephoron are hypothesized...
Free-ranging ungulates in North America are host to over 50 species of parasitic gastrointestinal nematodes (strongyles), many of which vary in their pathogenicity and response to anthropogenic and climatological disturbance. Consequently, species-specific identification is crucial to understanding the epizootiology of strongyles in wildlife. I validated a molecular assay (PCR-SSCP) for species-level differentiation of strongyles, and used this approach to help describe strongyle communities in western Canadian cervids. Three new host and ten new geographic records were described. Deer ( Odocoileus spp.) harboured a high diversity of strongyles with a distinct geographic partitioning of species. Prevalence of infection...
This project uses bottom-up modeling at a parcel scale to measure the effects of sea-level rise (SLR) on coastal ecosystems and tidal salt marshes. At selected tidal marshes, the project team will measure several parameters that will be incorporated into ArcGIS models creating comparable datasets across the Pacific coast tidal gradient with a focus on 2-4 sites in the California LCC (e.g. San Diego, San Francisco Bay Refuges). The ultimate goal is to provide science support tools for local adaptation planning from the bottom-up that may be implemented under a structured decision-making framework.Science Delivery Phase (2013): The objectives are to: (1) Disseminate site-specific baseline data and modeling results,...
Categories: Data, Project; Tags: 2011, 2013, Applications and Tools, CA, CA-Northern, All tags...
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The Nonindigenous Aquatic Species Database (NAS) information resource is an established central repository for spatially referenced biogeographic accounts of introduced aquatic species. The NAS website provides scientific reports, online/real-time queries, spatial data sets, distribution maps, fact sheets, and general information.
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This dataset includes dissolved oxygen data collected at 5-min intervals over a 24-hour period at three agricultural streams: Maple Creek in NE (2004), Morgan Creek in Delaware (2004) and Stalker Creek in Idaho (2007).
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This dataset includes water temperature and dissolved oxygen collected during July 2007 from Stalker Creek in Idaho. Data was collected at 3 minute intervals over several days.
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Background information. Settlement funds from the California Gulch Superfund site have been used to improve instream aquatic habitat and increase brown trout (Salmo trutta) populations in the Arkansas River. The upper Arkansas River Basin is a high-elevation mountain river that supports trout populations. Historically characterized by a relatively narrow channel with fast moving water, recent degradation of the upper Arkansas River due to historic land-use practices have contributed to an altered river channel and a decrease in important habitat features for trout, such as deep-water pools. This restoration project was designed to address three major issues: bank erosion, altered river channel morphology, and degraded...
Categories: Project; Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Amphibians, Aquatic, Bank stabilization/erosion control, Colorado, Colorado Mountain College, All tags...
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This dataset includes algal and invertebrate metrics used to assess water quality conditions in agricultural streams of the Midwest. Data was collected in wadable streams from 2003 to 2008. Data includes two benthic algal metrics (percent eutrophic taxa and observed taxa/expected taxa) and two benthic invertebrate metrics (EPT taxa and observed taxa/expected taxa).
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These data describe tree mortality and the factors associated with tree mortality for a variety of plots in Sequoia National Park. Most of the data were collected between 2014 and 2017 (during an extremely severe drought), along with some comparison data from 2004 to 2007. These data support the following publication: Stephenson, N.L., Das, A.J., Ampersee, N.J., Bulaon, B.M., and Yee, J.L., In review. Which trees die during drought? The key role of insect host-tree selection, Journal of Ecology
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An inventory (enumeration and taxonomic identification) of diet items consumed by wild-caught black carp, based on the examination of gut contents from fish that were collected in the lower Mississippi River drainage of the U.S.
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This U.S. Geological Survey (USGS) data release provides zooplankton data collected from Cheney Reservoir, Kansas, during October 2008 through October 2022. All data are reported as raw calculated values and are not rounded to USGS significant figures. This data release was produced in compliance with the open data requirements as a way to make scientific products associated with USGS research efforts and publications available to the public. The dataset includes all routine and quality assurance/quality control samples collected at the long-term sampling site on Cheney Reservoir located near the dam (USGS station identification number 07144790). Zooplankton were identified to the lowest possible taxonomic level...
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This portion of the data release presents aquatic invertebrate abundance data from samples collected in the Elwha River estuary, Washington, in 2007 and 2013 (no associated USGS Field Activities numbers because data were collected predominantly by biologists from the Lower Elwha Klallam Tribe). Replicate benthic samples were collected at 18 locations throughout the estuary complex using a petite Ponar grab sampler (appx. 2400 mL sample) and sorted through a 500-micron sieve. Samples were fixed in 10 percent formalin for 3 to 5 days before being transferred to 70 percent ethanol until processing. Individuals were identified to the lowest possible taxonomic resolution, but are grouped according to insect Orders in...
An outbreak of the two-year cycle budworm (Choristoneura biennis Freeman) has caused defoliation damage to interior spruce (Picea engelmannii Parry x P. glauca (Moench)) and subalpine fir (Abies lasiocarpa [Hook.] Nutt.) forests of north central British Columbia for more than 10 yr and was ongoing in 1999. A sample of 429 increment cores from spruce, subalpine fir, and lodgepole pine (Pinus contorta var. latifolia Engelm.) was collected in areas of chronic defoliation, and used in a dendro-ecological study. The objective was to develop accurately dated ring-width chronologies of each species and, by comparing growth rates of the budworm host tree species (spruce and fir) with those of the nonhost pine, to determine...
map background search result map search result map California Gulch NRDAR Arkansas River In-Stream Habitat Restoration Spruce beetles and forest ecosystems in south-central Alaska: A review of 30 years of research Mechanisms of aquatic species invasions across the South Atlantic Landscape Conservation Cooperative region Aquatic invertebrate abundance in the Elwha River estuary, Washington, in 2007 and 2013 Biological metrics used in a USGS National Water Quality Project assessing nutrients in agricultural streams Dissolved oxygen data used in a USGS National Water Quality Project assessing nutrients in agricultural streams Water temperature and dissolved oxygen data from Stalker Creek, Idaho, used in a USGS National Water Quality Project assessing nutrients in agricultural streams Tree mortality in Sequoia National Park from 2004 to 2007 and during severe drought in 2014 to 2017 Capture method, habitat, length, and diet items consumed by wild-caught black carp (Mylopharyngodon piceus) in the Mississippi River Basin, 2017-2019 Zooplankton Data for Cheney Reservoir near Cheney, Kansas, October 2008 through October 2022 (ver. 2.0, November 2023) Aquatic invertebrate abundance in the Elwha River estuary, Washington, in 2007 and 2013 Zooplankton Data for Cheney Reservoir near Cheney, Kansas, October 2008 through October 2022 (ver. 2.0, November 2023) Tree mortality in Sequoia National Park from 2004 to 2007 and during severe drought in 2014 to 2017 Spruce beetles and forest ecosystems in south-central Alaska: A review of 30 years of research California Gulch NRDAR Arkansas River In-Stream Habitat Restoration Capture method, habitat, length, and diet items consumed by wild-caught black carp (Mylopharyngodon piceus) in the Mississippi River Basin, 2017-2019 Mechanisms of aquatic species invasions across the South Atlantic Landscape Conservation Cooperative region Biological metrics used in a USGS National Water Quality Project assessing nutrients in agricultural streams Water temperature and dissolved oxygen data from Stalker Creek, Idaho, used in a USGS National Water Quality Project assessing nutrients in agricultural streams Dissolved oxygen data used in a USGS National Water Quality Project assessing nutrients in agricultural streams