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239 results for “Sierra Nevada”
Data From: Long-term winter food supplementation shows no significant impact on reproductive performance in Mountain Chickadees in the Sierra Nevada Mountains
<p>Supplemental feeding of wild animal populations is popular across many areas of the world and has long been considered beneficial, especially to avian taxa. Over four billion dollars are spent by hobby bird feeders in the United States each year alone. However, there is mixed evidence whether wildlife feeding is beneficial, including when it is implemented as a conservation management tool, a targeted experimental design, or an avocation. Much of the current evidence suggests that providing supplemental food is advantageous to the reproductive output and general survival of focal taxa. However, many of these studies are limited in scope and duration, leaving possible negative impacts unaddressed. This is particularly true regarding passive backyard feeding, which describes the majority of supplemental feeding, including the immense effort of millions of public enthusiasts. Here we show that winter supplemental feeding prior to reproduction had no significant impact on a range of reproductive parameters in a resident, montane passerine species, the Mountain Chickadee (<em>Poecile</em> <em>gambeli</em>). This population resides in an intact natural environment with no exposure to supplemental food beyond our experimental treatments, and individual birds were tracked across six years using radio frequency identification technology. Our results add to the growing evidence that supplemental feeding alone, isolated from the effects of urban environments, may have little to no impact on the population dynamics of some avian taxa.</p>
Sierra Nevada de Santa Marta frog locality data
<p>Climate change and habitat loss or fragmentation are two major threats to biodiversity. Montane amphibians are particularly sensitive to these threats. Colombia, a megadiverse country, is home to the world's second largest number of amphibians. The Sierra Nevada de Santa Marta (SNSM), an isolated mountain range, houses 48 amphibian species of which 17 are endemic. We aimed to address climate vulnerability of the amphibian community in the SNSM and prioritize amphibian species at risk and conservation actions. We conducted three visual encounter surveys from, 800 – 3,600 m, during September 2017 – July 2018. In order to assess species vulnerability, we completed two independent spatial analyses. First, we calculated the Area of Habitat of each species, defined as habitat available to a species. Area of Habitat was refined (from the original IUCN EOO maps) for the majority of amphibian species, averaging a reduction in available suitable habitat by 71%. We then examined the breadth of climatic space occupied by 16 species and how this space is predicted to shift under predicted climate scenarios (RCP scenarios 4.5 and 8.5) for 2050. Our analysis reveals a large reduction in climatic space under both 2050 RCP 4.5 and 8.5 scenarios. We combined these two analyses with trait data related to adaptive capacity, obtained from previous research, to create a combined (correlative-trait) climate change vulnerability assessment (CCVA) for 19 focal species (16 endemic). Our vulnerability assessment identified eight high priority species, including all three <i>Atelopus spp </i>and five within the <i>Pristimantis </i>complex. Given its isolation, the SNSM and endemic species are particularly susceptible to changing climates. The information provided from the CCVA offers a platform to develop regional strategies for climate change adaptation and conservation.</p>
Data for: Sierra Nevada mixed-conifer regeneration response to repeated burning varies by species
<p>Fire-exclusion has acted as a major perturbation on dry conifer forests in the western U.S., increasing tree density and, in mixed-conifer forests, the dominance of shade-tolerant species. Restoration efforts aim to reverse these effects by reducing stand density, restoring relative proportions of tree species, and reintroducing recurrent fire, but there are limited long-term data on the effects of repeated burning on tree regeneration. We analyzed two decades of seedling and overstory data from the Teakettle Experimental Forest in the southern Sierra Nevada, California, USA to determine how thinning and repeated burning affect seedling establishment and overstory recruitment. The treatments included three levels of thinning (no thin, understory thin, overstory thin) crossed with two levels of burning (burn, no burn). Treatments were replicated three times in 4 ha treatment units. Seedlings were surveyed at gridpoints within the treatment units for the pre-treatment period (1999-2000), following the first-entry burn (2004-2006), at 10 years post-treatment (2011-2012), and before (2016-2017) and after (2018-2020) the second-entry burn. We analyzed seedling response using mixed models. Across treatments, pine seedling densities remained much lower than shade-tolerant seedling densities. We found that repeated burns led to modest increases in sugar pine (<em>Pinus lambertiana</em>) and substantial increases in incense-cedar (<em>Calocedrus decurrens</em>) seedling densities four years post-burn. No significant differences in seedling densities among repeated burning treatments were detected for Jeffrey pine (<em>P. jeffreyi</em>) or white fir (<em>Abies concolor</em>). We used overstory stem map data and seedling data to estimate recruitment into the mid-story and found that estimates of natural mid-story recruitment were much higher among white fir and incense-cedar than pines, even following treatments. </p>
Dataset associated with "Assessment of the effects of the 2021 Caldor megafire on soil physical properties, eastern Sierra Nevadas, USA"
<p>This dataset includes both raw and processed data associated with the publication entitled "Assessment of the effects of the 2021 Caldor megafire on soil physical properties, eastern Sierra Nevadas, USA", published in MDPI Fire (doi: <a href="https://doi.org/10.3390/fire6020066">10.3390/fire6020066</a>). Raw files include exported .xlsx files from Meter Group HYPROP analyses, .csv files from 10 replicate measurements of saturated hydraulic conductivity for each analyzed sample using the Meter Group KSAT device, and raw .dat files from measurement of bulk thermal properties. A single additional file also documents the laboratory results from particle size and loss on ignition analyses. Processed data includes curve fitting parameters associated with fitting the soil water retention curves (SWRC) and thermal conductivity functions (TCFs) for each sample, as described in Sion et al. (2023). Additional requests associated with data from Sion et al. (2023) should be directed to the lead author.</p>
SIF and CLM5 outpfile files to support Kunik et al "Satellite-based solar-induced fluorescence tracks seasonal and elevational patterns of photosynthesis in California's Sierra Nevada mountains"
<p>These files contain 0.04° monthly sampled TROPOMI SIF, corrected for length of day and topography ("SIFdc_dem") over the Sierra Nevada region of California, along with Community Land Model (CLM) v5.0 point and regional simulation output. CLM5.0 simulations with prognostic vegetation state (CLM5.0-BGC, files begninning with "clm5_") and with satellite phenology (CLM5.0-SP, files beginning with "clm5_SP_") are provided. </p>
Isogeochemical characterization of mountain system recharge processes in the Sierra Nevada, California
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Do snow-adapted prey facilitate coexistence of the Sierra Nevada red fox with sympatric carnivores?
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Data From: Long-term winter food supplementation shows no significant impact on reproductive performance in Mountain Chickadees in the Sierra Nevada Mountains
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Data from: Abundance models of endemic birds of the Sierra Nevada de Santa Marta, northern South America, suggest small population sizes and dependence on montane elevations
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Three new taxa of Collinsia (Plantaginaceae) provide additional evidence for neoendemism in the upper Merced River watershed of the central Sierra Nevada, California
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Data from: Cryptic elevational zonation in trapdoor spiders (Araneae, Antrodiaetidae, Aliatypus janus complex) from the California southern Sierra Nevada
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Data from: Repeated high severity fire effects on soil biogeochemistry in the Sierra Nevada, California
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Data from: Sierra Nevada mountain lake microbial communities are structured by temperature, resources, and geographic location
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Repeated fuel treatments fall short of fire-adapted regeneration objectives in a Sierra Nevada mixed conifer forest, USA
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Data for: Sierra Nevada mixed-conifer regeneration response to repeated burning varies by species
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Sierra Nevada de Santa Marta frog locality data
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Data from: Tree growth responses to extreme drought after mechanical thinning and prescribed fire in a Sierra Nevada mixed-conifer forest, USA
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Evapotranspiration data from eddy-covariance flux-tower measurements and Landsat imagery in California’s Sierra Nevada from 1985 to 2019
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Dataset for: Cascading effects of freshwater salinization on plankton communities in the Sierra Nevada
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A Long-Term Micrometeorological and Hydrological Dataset Across an Elevation Gradient in Sagehen Creek, Sierra Nevada, California
We compile and release ~55 years of daily and ~20 years of hourly Micrometeorological and hydrological data from Sagehen Creek a 28 km???^2??? watershed with observation sites spanning 1771 to 2670 m. A USGS gauging station measures streamflow at the catchment outlet. There are three Snow Telemetry (SNOTEL) stations: Independence Camp(2128 m), Independence Creek (1962 m) and Independence Lake (2541 m) that measure hourly precipitation, temperature, soil moisture (at 5, 20, and 50 cm), as well as daily snow water equivalent (SWE) and snow depth. A new method was used to estimate hourly precipitation data using quality controlled daily totals. A NOAA cooperative observer (COOP) station measures daily precipitation, temperature, SWE, and snow depth from 1953-1997 and then measures hourly precipitation, temperature, SWE, and snow depth, relative humidity, and solar radiation from 2001 through 2017 2001-present. There are an additional three towers with data beginning in 2009 measuring snow depth, SWE, solar radiation, barometric pressure, precipitation, relative humidity, and temperature: Tower 1 (1934m), Tower 3 (2114 m), and Tower 4 (2350 m). Wind speed, temperature, and relative humidity measured at 7.6 and 30.5 m at each site. Data from all stations were checked for poor QA/QC and substantial and sophisticated gap-filling techniques were deployed. This dataset holds potential for improving understanding of orographic processes and their implications for streamflow generation in a groundwater-dominated watershed. This data package mirrors the one available at https://doi.org/10.5281/zenodo.2590799. Please check this link for updates and additional information.
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Allen Brain Atlas
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DANDI Archive for NWB datasets
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International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.