Skip to main content
Advanced Search

Filters: Tags: invertebrates (X)

235 results (48ms)   

Filters
Date Range
Extensions
Types
Contacts
Categories
Tag Types
Tag Schemes
View Results as: JSON ATOM CSV
ABSTRACT We compared macroinvertebrate assemblages sampled from artificial and natural substrates within a small, sandy-bottomed coastal plain stream, Alabama, USA. Separate samples were collected from natural coarse woody debris (CWD) accumulations, benthic sand substrate, and Hester-Dendy multiplate samplers (HDs, 54-d incubations). Shannon's H? was lowest and % dominant taxon was highest in sand samples. Proportion of the total assemblage as EPT taxa (Ephemeroptera, Plecoptera, and Trichcptera) was significantly higher on HDs than from sand, and proportion of the assemblage as Chironomidae was higher from sand than on CWD. Invertebrate biomass on HDs was almost two times higher than from sand, whereas biomass...
thumbnail
Note: This data release has been superseded by version 2.0, available here: https://doi.org/10.5066/P968UDS7. This U.S. Geological Survey (USGS) data release provides zooplankton data collected from Cheney Reservoir, Kansas, during October 2008 through July 2021. 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...
Intensification of permafrost thaw has increased the frequency and magnitude of large permafrost slope disturbances (mega slumps) in glaciogenic terrain of northwestern Canada. Individual thermokarst disturbances up to 40 ha in area have made large volumes of previously frozen, highly weatherable fine-grained sediments available for leaching and transport to adjacent streams, significantly increasing sediment and solute loads in these systems. To test the effects of this climate-sensitive disturbance regime on the ecology of Arctic streams, we explored the relationship between physical and chemical variables and benthic macroinvertebrate communities in disturbed and undisturbed stream reaches in the Peel Plateau...
This biogeographical study documents the modern distribution of ostracodes in the southwest Yukon Territory and northern British Columbia, Canada. The study tested the hypothesis that dissolved ion composition and concentrations of the lake water are the primary determinants of the distribution of modern ostracodes in this region. A total of 28 freshwater species representing 8 genera were identified in the 33 study lakes. Species common in the southwest Yukon are widely distributed throughout North America, and include Cyclocypris ampla , Candona candida , Cypria turneri , Cypria ophtalmica , and Candona protzi . Concentrations of ostracode valves were highest in four lakes with moderate conductivity values ranging...
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.
thumbnail
The Midwest United States is facing wetter winters and springs and more variable precipitation in the summer and fall. Heavy floods and prolonged droughts are costly to agriculture, housing, transportation infrastructure, and recreational opportunities across the region. These extremes also stress the health of freshwater ecosystems that are important to the regional economy and quality of life. The number of freshwater invertebrates like mussels, crayfish, and aquatic insects are generally declining which strongly indicates declining freshwater health. Losing these animals limits benefits such as water purification, food for wildlife, and aesthetic values. This project seeks to understand and synthesize information...
thumbnail
This dataset includes Gross Primary Production (GPP) estimates at 46 agricultural streams around the United States. GPP values are based upon the single-station dissolved oxygen method with data collected at 5-min intervals over a 24-hour period. GPP data is presented as grams dissolved oxygen per meter square per day.
In the White River basin, water demand has increased with human development. Water development projects impact White River hydrology and sediment transport which can, in turn, affect resident Colorado pikeminnow populations. The objectives for this study were: 1) to compile historical biological, hydrological and physical data for the White River, 2) to analyze physical, chemical and biological features of the White River important to endangered fishes and, 3) to identify parameters for long-term monitoring to insure these features are maintained. We examined physical, chemical and biological characteristics during three development periods in the UCRB: early (1895-1945), middle (1946-1984) and post Taylor Draw...
In 1991, the U.S. Geological Survey (USGS) began a study of more than 50 major river basins across the Nation as part of the National Water-Quality Assessment (NAWQA) project of the National Water Quality Program. One of the major goals of the NAWQA project is to determine how water quality and ecological conditions change over time. To support that goal, long-term consistent and comparable ecological monitoring has been conducted on streams and rivers throughout the Nation. Fish, invertebrate, and algae data collected as part of the NAWQA program were retrieved from the USGS Aquatic Bioassessment database for use in trend analysis. Ultimately, these data will provide insight into how natural features and human...
thumbnail
A phylogenetic analysis of 19 sibling taxa in the Vertigo gouldii group was conducted on 73 individuals sampled across North America using DNA sequence data of the mitochondrial genes cytochrome oxidase subunit 1 (CO1) and 16S ribosomal RNA (16S), and the internal transcribed spacer-2 of the nuclear ribosomal RNA (ITS-2) gene. The results of these analyses were found incongruent with previous taxonomic concepts used to define the V. gouldii group and its composite taxa that were based entirely on conchological features. The mtDNA sequence data suggest that some previous members of the traditional V. gouldii group may be more closely related to V. modesta. They also suggest that V. gouldii may itself consist of seven...
thumbnail
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...
thumbnail
Introduction: ... As a directed effort to further document moths of limited geographic occurrence, an initial inventory of the southwestern Yukon was conducted in 2004. Survey efforts focused on habitats known to harbor species of limited occurrence, particularly sand dunes and low elevation grasslands / steppe. Alpine tundra was also surveyed, but to a lesser extent owing to the fact that many of the Beringian endemic species have a biennial life cycle and fly only in odd-numbered years (Lafontaine & Wood 1997). Although Yukon's boreal habitats are undoubtedly home to many species not yet documented from this territory, the boreal fauna is generally transcontinental in distribution, and survey work was not explicitly...
Groundwater-fed streams are typically hotspots of aquatic biodiversity within glacierized catchments. Surface water physicochemistry and macroinvertebrate communities within five groundwater-fed streams were characterised across catchments in Denali National Park, interior Alaska. The main aim of this study was to assess whether hydrological controls on macroinvertebrate communities (e.g. flow permanence) identified within previous catchment-specific studies are present at wider spatial scales, across multiple groundwater-fed streams located on alluvial terraces within glacierized catchments. Macroinvertebrate community diversity, in general, was shown to be high and relatively invariant across the groundwater-fed...
map background search result map search result map Impact of epidermal leaf mining by the aspen leaf miner ( Phyllocnistis populiella) on the growth, physiology, and leaf longevity of quaking aspen 2004 moth survey for southwestern Yukon Short-Term Demographic Response of the Red-Backed Vole to Spruce Beetle Infestations in Alaska Evolutionary pattern and process within the Vertigo gouldii (Mollusca: Pulmonata, Pupillidae) group of minute North American land snails The role of interference competition in a sustained population outbreak of the aspen leaf miner in Alaska Bark-beetle-attacked trees produced more charcoal than unattacked trees during a forest fire on the Kenai Peninsula, Southern Alaska An inter-catchment assessment of macroinvertebrate communities across groundwater-fed streams within Denali National Park, interior Alaska Cryptic subarctic diversity: a new bumblebee species from the Yukon and Alaska (Hymenoptera: Apidae) Gross Primary Production (GPP) data used in a USGS National Water Quality Project assessing nutrients in agricultural streams Ecological community datasets used to evaluate the presence of trends in ecological communities in selected rivers and streams across the United States, 1992–2017 Zooplankton Data for Cheney Reservoir near Cheney, Kansas, October 2008 through July 2021 Synthesizing the Responses and Vulnerabilities of Freshwater Invertebrates to Droughts and Heavy Precipitation in the Midwest Zooplankton Data for Cheney Reservoir near Cheney, Kansas, October 2008 through July 2021 Impact of epidermal leaf mining by the aspen leaf miner ( Phyllocnistis populiella) on the growth, physiology, and leaf longevity of quaking aspen The role of interference competition in a sustained population outbreak of the aspen leaf miner in Alaska Short-Term Demographic Response of the Red-Backed Vole to Spruce Beetle Infestations in Alaska Bark-beetle-attacked trees produced more charcoal than unattacked trees during a forest fire on the Kenai Peninsula, Southern Alaska An inter-catchment assessment of macroinvertebrate communities across groundwater-fed streams within Denali National Park, interior Alaska 2004 moth survey for southwestern Yukon Cryptic subarctic diversity: a new bumblebee species from the Yukon and Alaska (Hymenoptera: Apidae) Synthesizing the Responses and Vulnerabilities of Freshwater Invertebrates to Droughts and Heavy Precipitation in the Midwest Evolutionary pattern and process within the Vertigo gouldii (Mollusca: Pulmonata, Pupillidae) group of minute North American land snails Gross Primary Production (GPP) data used in a USGS National Water Quality Project assessing nutrients in agricultural streams Ecological community datasets used to evaluate the presence of trends in ecological communities in selected rivers and streams across the United States, 1992–2017