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Filters Date Range Past year (0) Past month (0) Past week (0) Past day (0) Custom range... To   Search Extensions Citation (7) Shapefile (1) Types Journal Citation (5) Downloadable (1) Map Service (1) OGC WFS Layer (1) OGC WMS Layer (1) Shapefile (1) Contacts Michael J Osland U.S. Geological Survey, Alaska Science Center Anya Metcalfe Ecosystems Southwest Biological Science Center More... Categories Publication (7) Data (2) Tag Types Theme (3) Place (2) Science Themes (2) Harvest Set (2) Organization (2) Landscapes (1) Science Tools For Managers (1) More... Tag Schemes None (2) USGS Thesaurus (2) Geographic Names Information System (2) https://www.sciencebase.gov/vocab/category/NCCWSC/ScienceThemes (2) USGS Biocomplexity Thesaurus (1) ISO 19115 Topic Categories (1) https://www.sciencebase.gov/vocab/category/NCCWSC/Project/OrganizationName (2) More... View Results as: JSON ATOM CSV

Estimates of global cyanobacterial biomass and its distribution We estimated global cyanobacterial biomass in the main reservoirs of cyanobacteria on Earth: marine and freshwater plankton, arid land soil crusts, and endoliths. Estimates were based on typical population density values as measured during our research, or as obtained from literature surveys, which were then coupled with data on global geographical area coverage. Among the marine plankton, the global biomass of Prochlorococcus reaches 120 × 10^12 grams of carbon (g C), and that of Synechoccus some 43 × 10^12 g C. This makes Prochlorococcus and Synechococcus, in that order, the most abundant cyanobacteria on Earth. Tropical marine blooms of Trichodesmium account for an additional 10 × 10^12 g C worldwide. In terrestrial... Categories: Publication; Types: Citation, Journal Citation; Tags: Algological Studies, Cyanobacteria, abundance, arid land soils, benthos, All tags... freshwater, geography, global biomass, marine, plankton, population density, quantification, terrestrial environments, Fewer tags Climatic controls on the global distribution, abundance, and species richness of mangrove forests MethodsStudy area: Our initial study area included the entire globe. We began with a seamless grid of cells with a resolution of 0.5 degrees (i.e., ~50 km at the equator). Next, we created polylines representing coastlines using SRTM (Shuttle Radar Topographic Mission) v4.1 global digital elevation model data at a resolution of 250 m (Reuter et al. 2007). We used these coastline polylines to identify and retain cells that intersected the coast. We excluded 192,227 cells that did not intersect the coast. To avoid cells with minimal potential coastal wetland habitat, we used the coastline data to remove an additional 1,056 coastal cells that contained less than or equal to 5% coverage of land. We also removed 176... Categories: Data; Types: Citation, Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Climate change, USGS Science Data Catalog (SDC), abundance, climate gradients, climatic drivers, All tags... climatic thresholds, distribution, ecological thresholds, mangrove forests, rainfall, range limit, species richness, temperature, Fewer tags Density dependent matrix model for gray wolf population projection A Leslie matrix model was developed for a small gray wolf (Canis lupus) population recolonizing an area with abundant resources and uncontrolled by humans. The model was modified to describe population growth in a limited environment using a discrete form of the logistic equation. The density dependent Leslie matrix model was applied to investigate gray wolf population recovery in the Upper Peninsula of Michigan. Estimates from the density dependent matrix model were compared with published winter count estimates from the Michigan Department of Natural Resources. The gray wolf population in the Upper Peninsula of Michigan was projected to reach a total of 929 wolves by the year 2012 with a 95% confidence interval... Categories: Publication; Types: Citation, Journal Citation; Tags: Ecological Modelling, Leslie matrix model, abundance, gray wolf, logistic equation, All tags... winter count estimates, Fewer tags Occurrence of native Colorado River cutthroat trout ( Oncorhynchus clarki pleuriticus ) in the Escalante River drainage, Utah Field surveys were conducted during 1997 and 1998 documenting the distribution and abundance of Colorado River cutthroat trout (Oncorhynchus clarki pleuriticus) in Escalante River tributaries. This documented occurrence of native trout in the Escalante River drainage of southern Utah represents an expansion of the known historic range of this subspecies as reported before the 1990s. We found 5 populations of native trout ranging in biomass from 3.0 to 104.2 kg ha-1 and occupying 13.2 km of stream of 130 km of estimated historic habitat. Current distribution and abundance of Colorado River cutthroat trout were compared to early introductions of nonnative trout stocked for sport fishing purposes. Native cutthroat... Categories: Publication; Types: Citation, Journal Citation; Tags: Colorado River, Escalange River, Western North American Naturalist, abundance, cutthroat trout, All tags... distribution, drainage, history, management, native trout, nonnative trout, occurrence, stocking, Fewer tags Angel Lichen Moth Abundance and Morphology Data, Grand Canyon, AZ, 2012 Two unique datasets on the abundance and morphology of the angel lichen moth (Cisthene angelus) in Grand Canyon, Arizona, USA were compiled to describe the phenology and life history of this common, but poorly known, species. The abundance data were collected from 2012 to 2013 through a collaboration with river runners in Grand Canyon National Park. These citizen scientists deployed light traps from their campsites for one hour each night of their expedition. Insects were preserved in ethanol on site, and returned to the Southwest Biological Science Center in Flagstaff, Arizona for analysis in the laboratory. A total of 2,437 light trap samples were sorted through, 903 of which contained C. angelus. In total, 73,841... Types: Citation; Tags: Abundance, Angel lichen moths, Arizona, Cisthene angelus, Citizen science, All tags... Coconino County, Colorado Plateau, Colorado River, Diamond Creek, Elevation gradient, Environmental gradients, Grand Canyon, Lees Ferry, Life history, Light traps, Maturation, Mohave County, Morphology, Page, Peach Springs, Phenology, Reproduction, Riverine environment, Southwest United States, USGS Science Data Catalog (SDC), Voltinism, Wing length, northern Arizona, Fewer tags Estimating the breeding population of long-billed curlew in the United States Determining population size and long-term trends in population size for species of high concern is a priority of international, national, and regional conservation plans. Long-billed curlews (Numenius americanus) are a species of special concern in North America due to apparent declines in their population. Because long-billed curlews are not adequately monitored by existing programs, we undertook a 2-year study with the goals of 1) determining present long-billed curlew distribution and breeding population size in the United States and 2) providing recommendations for a long-term long-billed curlew monitoring protocol. We selected a stratified random sample of survey routes in 16 western states for sampling in... Categories: Publication; Types: Citation, Journal Citation; Tags: Journal of Wildlife Management, Numenius americanus, abundance, double-observer method, long-billed curlew, All tags... monitoring, population estimation, removal method, roadside bias, Fewer tags Reach- and Watershed-Scale Associations of Crayfish within an Area of Varying Agricultural Impact in West-Central Indiana We studied the associations of crayfish with reach-scale instream habitat and water quality variables and watershed-scale variables of riparian and watershed land cover, runoff, impervious surfaces, and hydrologic soil type in west-central Indiana. Crayfish assemblage was measured by abundance, species richness, and diversity (Shannon's H) at 180 sites. The western portion of the study area, within the Interior River Lowland ecoregion, has been heavily impacted by agriculture, while the eastern portion, within the Interior Plateau ecoregion, is more heavily wooded and less impacted. The ability of variables at each spatial extent to predict crayfish assemblage was assessed using multiple linear regression analysis.... Categories: Publication; Types: Citation; Tags: ASFA 1: Biological Sciences & Living Resources, Abundance, Agricultural development, Agriculture, Biology--Entomology, All tags... British Columbia, Cambaridae, Canada, D 04040:Ecosystem and Ecology Studies, Data Visualization & Tools, Ecology Abstracts, Freshwater, Freshwater crustaceans, Habitat, Indiana, Interior Plateau, Landscapes, M3 1010:Issues in Sustainable Development, Models, Northeast CASC, Other Landscapes, Prediction, Q1 01463:Habitat community studies, Regression analysis, Riparian environments, Riparian zone, Rivers, Runoff, Science Tools For Managers, Soil types, Soils, Species Richness, Species diversity, Sustainability Science Abstracts, USA, Water Resources Abstracts, Watersheds, plateaus, spatial distribution, water quality, Fewer tags Gulf Watch Alaska, Benthic Monitoring Component: Sea Otter Aerial Survey Data Kenai Fjords National Park, 2002-2016 These data are is part of the Gulf Watch Alaska (GWA) long term monitoring program, nearshore monitoring component. Specifically, these data describe sea otter (Enhydra lutris) aerial survey observations from the waters around Kenai Fjords National Park between 2002 and 2016. Sea otters are a keystone predator, well known for structuring the nearshore marine ecosystem through their consumption of invertebrate prey. The dataset consists of 3 comma delimited files exported from Microsoft Excel. The data consists of 1. Strip transect counts, 2. Intensive Search Unit (ISU) counts, and 3. Transect coordinates. For each aerial survey, a pilot flew an airplane at an altitude of 91m over pre-determined transects while an... Categories: Data; Types: Citation; Tags: Enhydra lutris, Gulf of Alaska, Kenai Fjords National Park, abundance, aerial survey, All tags... biota, coastal ecosystems, distribution, ecology, ecosystem monitoring, environment, marine ecology, marine mammals, monitoring, population dynamics, sea otters, Fewer tags Macroecology: more than the division of food and space among species on continents Macroecology is a big-picture, statistical approach to the study of ecology. By focusing on broadly occurring patterns and processes operating at large spatial and temporal scales and ignoring localized and fine-scaled details, macroecology aims to uncover general mechanisms operating at organism, population and ecosystem levels of organization. Although such an approach is evident in writings dating from the mid- to late 1800s, not until 1989 was the domain of macroecology clearly articulated. Since then there has been an exponential growth in publications employing a macroecological perspective. Here we (1) briefly review the history of macroecology, with emphasis on cultural, scientific and technological innovations... Categories: Publication; Types: Citation, Journal Citation; Tags: Progress in Physical Geography, abundance, biogeography, body size, metabolic theory, All tags... palaeoecology, range size, species, species diversity, Fewer tags Modeling apple snail population dynamics on the Everglades landscape Abstract (from http://link.springer.com/article/10.1007%2Fs10980-015-0205-5): Context The Florida Everglades has diminished in size and its existing wetland hydrology has been altered. The endangered snail kite (Rostrhamus sociabilis) has nearly abandoned the Everglades, and its prey, the apple snail (Pomacea paludosa), has declined. Objective We developed a population model (EverSnail) to understand apple snail response to inter- and intra-annual fluctuations in water depths over the Everglades landscape. EverSnail was developed as a tool to understand how apple snails respond to different hydrologic scenarios. Methods EverSnail is an age- and size-structured, spatially-explicit landscape model of P. paludosa... Categories: Publication; Types: Citation; Tags: Abundance, Distribution, Florida, Hydrology, Management, All tags... National CASC, Plants, Population matrix model, Restoration, Snail kite, Water, Coasts and Ice, Wetlands, Wetlands, Wildlife and Plants, Fewer tags