Ray developed the following sub-models to assess the effects of these different types of variables: Lead author and IBP Research Ecologist Chris Ray used a modeling approach to quantify and account for variables that may affect detection of birds in the field, as well as to examine geographic or climate effects that may influence bird abundance. The data that made this report possible are a testament to the hard work and dedication of those who got up before dawn and carried backpacks and binoculars on miles of trails to reach the monitoring sites by sunrise. ![]() By sunrise, each two-person crew must be at their start point, and each person hikes out to seven transect points and pauses for a set time period to identify birds, sometimes by sight, but much more often by sound. Crews backpack or dayhike to survey start points along trails in the large network parks – Yosemite and Sequoia & Kings Canyon. They must pass a bird identification exam before they can collect data. Collecting bird data in the Sierra is not just a walk in the park – it takes excellent birding skills and being comfortable backpacking across rugged terrain to remote areas.įield technicians must go through three weeks of training in bird identification and safe practices for working in wilderness. They detected 134 species during formal counts and 32 additional species during other crew activities. NPS / Sylvia Haultain Field staff provide critical support.īetween 20, field technicians detected 166 bird species at 2,048 point count stations in Sierra Nevada Network parks. ![]() After nearly a decade of monitoring bird populations in Sierra Nevada Network parks with our partners at The Institute for Bird Populations (IBP), we have our first report of trends in bird abundance, based on data collected between 20.īird crew training in Giant Forest, Sequoia National Park, May 2022. As climate changes, increased temperature, decreased snowpack, altered fire regimes, and plant community shifts may alter the ranges of bird species.ĭata documenting bird population changes contribute to park planning documents and can support assessments of bird population vulnerability to large-scale change such as warming temperatures and increasing severity of drought and wildfires. They are good indicators of change in terrestrial ecosystems and occupy a prominent position in most food webs. Why monitor birds?īirds occur across elevations and represent more than 60 percent of vertebrate species in these parks. This species had a declining trend in Sequoia & Kings Canyon, an increasing trend in Devils Postpile, and a slight increasing trend in Yosemite.īryan Jones, Flickr, CC-BY-NC-ND 2.0. Accessed DAY MONTH YEAR.The Steller's Jay had mixed trend results among Sierra Nevada Network parks across breeding seasons in 2011-2019. Source imagery for HRSL © 2016 DigitalGlobe. To reference this data, please use the following citation: Facebook Connectivity Lab and Center for International Earth Science Information Network - CIESIN - Columbia University. ![]() This preserves the relative population totals across administrative units while matching the UN total. The resulting adjustment factor is multiplied by each administrative unit census value for the target year. The UN estimate for a given country (or state/territory) is divided by the total census estimate of population for the given country. For more information about the methodology used to create our high resolution population density maps and the demographic distributions, please visit: įor information about how to use HDX to access these datasets, please visit: Īdjustments to match the census population with the UN estimates are applied at the national level. The resulting maps are the most detailed and actionable tools available for aid and research organizations. Then we work with our partners at Columbia University to overlay general population estimates based on publicly available census data and other population statistics. To create our high-resolution maps, we use machine learning techniques to identify buildings from commercially available satellite images. Creative Commons Attribution International
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