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The dataset consists of two csv files one for adult snakes and one for captive-reared juvenile snakes. The data contains start times (when snakes entered the study) and end times (when snakes died or were censored from the study) for survival analysis. The data also contains general information about the individual snakes (id, snout-vent length, treatment group, whether or not they were translocated), sex (juveniles only since adults were all female), surface activity (and data needed to calculate surface activity), and average distance moved between telemetry resighting. The above information was used as covariates in the survival models. These data support the following publication: Nguyen, A.M., Todd, B.D....
Categories: Data;
Tags: California,
Ecology,
USGS Science Data Catalog (SDC),
Wildlife Biology,
biota,
We used free-ranging northern elephant seals as a model species to investigate maternal transfer of mercury (Hg) to pups in relation to maternal traits, including maternal blood mercury concentrations, and to quantify the links between pup lanugo mercury concentrations and maternal mesopelagic foraging behavior during gestation. We satellite tracked known-age adult females at sea during their seven-month-long foraging trip to determine maternal foraging strategies (geographic locations and diving depths) and quantified mercury concentrations in maternal blood and their pups’ blood and lanugo (which is defined as pup hair grown in utero) early in lactation when seals were hauled out. We then tested how the maternal...
Categories: Data;
Tags: Ecology,
Environmental Health,
Marine Oceanic Mesopelagic Layer,
USGS Science Data Catalog (SDC),
Wildlife Biology,
These data represent trapping effort and captures of deer mice at Point Reyes National Seashore, Marin County, California. Deer mice were captured and marked with ear tags to allow identification of individuals. The location of captures can be used in a spatially explicit capture recapture model to estimate density of mice and how mouse density varies by site and habitat type.
Categories: Data;
Types: Downloadable,
Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service,
Shapefile;
Tags: California,
Ecology,
Marin County,
Point Reyes National Seashore,
USGS Science Data Catalog (SDC),
Body mass data (measured in grams) of dabbling and diving ducks harvested in three regions of California: Sacramento Valley, Suisun Marsh, and San Joaquin Valley during the 2014/2015, 2015/2016, 2016/2017, 2018/2019, and 2019/2020 hunting seasons. In addition to mass, the flattened length of right wing, species, sex, age, and date of harvest were also recorded. These data support the following publication: Herzog, M.P, Ackerman, J.T., Kohl, J.D., Fettig, B.L., Hartman, C.A., Peterson, S.H., Casazza, M.L., and Fleskes, J.P., 2024. Body mass changes of dabbling and diving ducks wintering in California. Journal of Wildlife Management, e22650. https://doi.org/10.1002/jwmg.22650
This data release is comprised of tidal marsh biomass data and spatial predictions of peak biomass and Julian day of peak biomass using data from the Landsat archive. Aboveground biomass dry weight of mixed-species plots (25x50 cm) at a tidal marsh in Willapa Bay, Washington were used to establish a relationship between biomass and tasseled cap greeness (TCG). The julian day of annual peak greenness and the value of annual peak greenness for 32 years at Bandon National Wildlife Refuge (NWR), Grays Harbor NWR, and Nisqually NWR was calculated by fitting a Gaussian function to the TCG values for a given year. The value of each 30 meter pixel is the Julian day of maximum predicted TCG or the maximum predicted TCG....
Elevation projections from the WARMER-Mangroves model for J N. "Ding" Darling National Wildlife Refuge across a range of sea-level rise scenarios (53, 115, and 183 cm by 2100). The model was calibrated using dated soil cores sampled from the basin hydrologic zone. These data support the following publication: Buffington, K.J., Thorne, K.M., Krauss, K.W., Conrad, J.K., Drexler, J.Z., and Zhu, Z., in-review. Vulnerability of Sanibel Island’s mangrove resources to sea-level rise (Florida, USA).
Adult female San Francisco gartersnakes (Thamnophis sirtalis tetrataenia) were captured and examined using an ultrasound device to determine if they were gravid and count the number of embryos in those that were. Morphological data including length and mass were collected for each snake, along with the date of capture and a study site identifier. These data support the following publication: Rose, J.P., Kim, R., Schoening, E.J., Lien, P.C., and Halstead, B.J., 2023. Comparing reintroduction strategies for the endangered San Francisco gartersnake (Thamnophis sirtalis tetrataenia) using demographic models. PLoS ONE 18(10): e0292379. https://doi.org/10.1371/journal.pone.0292379
Categories: Data;
Tags: Ecology,
San Mateo County,
USGS Science Data Catalog (SDC),
Wildlife Biology,
biota,
This data provides county level occurrence information for all individuals used in modelling potential exposure and spread of highly pathogenic avian influenza (HPAIv) from the 2021-2022 North American outbreak. The data set contains individual identifiers and taxa information, an indicator of exposure, exposure status (Susceptible, Exposed by HPAIv detection in the county, or Exposed by secondary contact with an exposed bird), and date of first occurrence of each individual bird and that bird's exposure status within each visited county. Herein, county refers to any county, parish, borough, census area, or geographic region identified in the associated geospatial data US_CAN_AI.shp (ESRI shapefile format). Occurrence...
Categories: Data;
Types: Downloadable,
Map Service,
OGC WFS Layer,
OGC WMS Layer,
Shapefile;
Tags: Canada,
Ecology,
Remote Sensing,
USGS Science Data Catalog (SDC),
United States,
Eggshells of 13 waterbird species were divided in half longitudinally and the outer eggshell membrane was removed from one of the halves. Eggshell thickness was measured for both eggshell halves, both with and without the outer eggshell membrane. The eggshell membrane thickness was calculated by taking the difference between the two thickness measurements. These data support the following publication: Santolo, G.M., Peterson, S.H., Cooney, B., Hartman, C.A., Herzog, M.P. and Ackerman, J.T., 2024. Eggshell membrane thickness and its contribution to total eggshell thickness for 13 waterbird species. The Wilson Journal of Ornithology. https://doi.org/10.1676/23-00017
Categories: Data;
Tags: American avocet,
American coot,
Black skimmer,
Black-necked stilt,
California gull,
This dataset includes egg total mercury concentrations, egg total mercury burden, egg length, egg width, predicted egg volume, and predicted fresh wet weight according to egg position in the laying sequence for tree swallow and house wren eggs from the Cache Creek Settling Basin and Cosumnes River Preserve, in California's Central Valley during 2018. These data support the following publication: Hartman, C.A., Ackerman, J.T., Cooney, B., and Herzog, M.P., 2024. Egg mercury concentration and egg size varies with position in the laying sequence in two songbird species. Environmental Toxicology and Chemistry.
Categories: Data;
Tags: Cache Creek Settling Basin,
Cosumnes River Preserve,
Ecology,
Environmental Health,
USGS Science Data Catalog (SDC),
The Coastal Cactus Wren is a species of high conservation concern in southern California. The goal of this project was to obtain taxonomic resolution of subspecies boundaries between coastal and desert populations of Cactus Wrens. We collected genetic samples from Cactus Wrens at California desert sites and combined this dataset with previously collected samples from coastal populations to resolve the distribution of subspecies and to determine distinct genetic lineages, gene flow, genetic diversity and effective population size of desert populations. Understanding these relationships will assist managers with development and implementation of a conservation and management strategy that could aim to avoid state...
Categories: Data;
Tags: California,
DNA sequencing,
Ecology,
Genetics,
USGS Science Data Catalog (SDC),
Bird and habitat surveys were conducted in winter-flooded rice fields in the Sacramento Valley, California, USA during the fall and winters of 2021-2022 (Oct 2021 through February 2022) and 2022-2023 (December 2022 through February 2023). Rice field sampling consisted of (1) a bird survey that was followed by (2) an overall habitat assessment and (3) a more detailed habitat transect survey. Rice farms in the Sacramento Valley are organized into separate rice fields that each consist of multiple smaller rice checks. This dataset contains 253 surveyed rice checks with the observed bird abundances for each rice check, calculated diversity metrics, and measured habitat variables.
Step selection functions use animal movement patterns to estimate habitats available at each step along a movement track. These data were generated from four species of waterfowl (Anser albifrons [greater white-fronted goose], Anser caerulescens caerulescens [lesser snow goose], Anas platyrhynchos [mallard], Anas acuta [northern pintail]) using the Central Valley of California 2016 to 2022 that were fit with tracking devices collecting GPS data every hour (or subset to hourly locations). Observed movements were used to estimate a 2-mixture log-normal step length distribution for each species. The shorter mean step length mixture generally reflected step lengths consistent with individual immobility and GPS errors....
Categories: Data;
Tags: California,
Central Valley,
Ecology,
GPS measurement,
USGS Science Data Catalog (SDC),
Collection of microsatellite genetic data from multiple projects involving southern mule deer (Odocoileus hemionus fuliginatus) in San Diego County, California. Samples were collected 2005-2007, 2010, 2012-2013, 2015, and 2018-2020. These data support the following publication: Mitelberg, A., Smith, J.G., and Vandergast, A.G., 2019, DNA Fingerprinting of Southern mule deer (Odocoileus hemionus fuliginatus) in north San Diego County, California (2018–19): U.S. Geological Survey Open-File Report 2019–1138, 25 p., https://doi.org/10.3133/ofr20191138.
Categories: Data;
Tags: DNA sequencing,
Ecology,
Genetics,
San Diego,
USGS Science Data Catalog (SDC),
Heavy metal contamination (n=17 metals) of feather and tissue samples from live and deceased Anna's hummingbirds (Calypte anna) was evaluated. Feathers taken from live birds are low in sample weight, therefore a novel method was used in feather sample preparation. Feather samples were then analyzed utilizing an inductively coupled plasma mass spectrometry (ICP-MS) assay. In addition, ICP-MS was used to measure heavy metal concentrations in feather and tissue samples from salvaged hummingbird carcasses. Iron, zinc, selenium and mercury concentrations were most commonly elevated in body feathers from live birds with mercury being the metal most likely to be found in elevated concentrations. Because of this, we conducted...
Categories: Data;
Tags: Anna’s hummingbird,
Calypte anna,
Mercury contamination,
Northern California,
Sierra Nevada foothills,
The data were collected at Morley Nelson, Birds of Prey National Conservation Area (NCA) where known grazing regimes, including the season of grazing, have been in practice for the last 30 years. Surveyed plots were placed to account for intensity of grazing and to avoid confounding disturbances. Data were collected on the morphogroups of biological soil crusts (biocrusts) found within the NCA, and include measurements on soils related to texture, carbon, nitrogen and the abundance of soil aggregating cyanobacteria in the soil. These data support the following publication: Condon, L.A., Rosentreter, R., Veblen, K.E. and Coates, P.S., 2024. Season of grazing interacts with soil texture, selecting for associations...
Categories: Data;
Tags: BLM AIM data,
Birds of Prey National Conservation Area,
Ecology,
Great Basin,
Idaho,
Expanding human enterprise across remote environments impacts many wildlife species, including sage-grouse (Centrocercus urophasianus), an indicator species whose decline is at the center of national conservation strategies and land use policies. Anthropogenic resources provide subsidies for generalist predators, potentially leading to cascading effects on sensitive prey species at lower trophic levels. In semi-arid western ecosystems, common ravens (Corvus corax) are expanding in distribution and abundance, and may be negatively affecting sage-grouse reproductive success at broad spatial scales. Ravens are a common predator of sage-grouse nests, and potentially prey on chicks as well. This research aimed to address...
Categories: Data;
Tags: Great Basin,
USGS Science Data Catalog (SDC),
Wildlife Biology,
biota,
geographic information systems (GIS),
Genetic samples in the form of a small blood sample were collected from 263 Bell’s vireos (Vireo bellii) in drainages throughout southern and central California, Arizona, southern Nevada, and southwestern Utah. We used population genomic techniques to delineate the range limit between the Least Bell’s Vireo (V. b. pusillus) and its conspecific geographical neighbor, the Arizona Bell’s Vireo (V. b. arizonae). This study provides a taxonomic classification of individuals sampled where the two subspecies meet. Moreover, it allows an estimate of genetic diversity and trends in both taxa, estimates sources and levels of dispersal and gene flow among drainages, and allows us to assess progress of recovery and effectiveness...
The U.S. Geological Survey, Western Ecological Research Center collected sediment and accretion data at a wave-exposed tidal salt marsh in South San Francisco Bay, California. Sediment traps and feldspar marker horizons (MH) were deployed along transects of increasing distance from the sediment source, at primary, secondary and tertiary marsh channels/bay. Data were collected bi-monthly over two month periods in summer 2021 and winter 2021/2022. Included here are trap and MH plot locations, calculated sediment fluxes at each station by deployment period, annual accretion rates, and covariates associated with sediment deposition and accretion including vegetation structure and elevation. This project aimed to assess...
Categories: Data;
Tags: Ecology,
Eden Landing Ecological Reserve,
High Salt Marsh,
Land Use Change,
San Francisco Bay,
This dataset contains the survey effort by U.S. Geological Survey (USGS) biologists sampling for Temblor legless lizards (Anniella alexanderae) in 2022 and 2023, the results of those surveys, and environmental covariates relevant to detection and occupancy of this species. At the time of the species description, little was known about the distribution of the Temblor legless lizard beyond a few localities. Surveys were designed to gather information on the distribution of Temblor legless lizards to help inform a Species Status Assessment by the U.S. Fish and Wildlife Service. Binary values for each year indicate whether Temblor legless lizards were detected under cover boards at a site in that year (1) or were not...
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