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Found 2 results

  1. I am looking for some guidance on producing density and population estimates from a point count dataset for about a dozen grassland bird species while linking relationships to a suite of habitat data. I had intended to use package 'detect', adapting previously used code, but in light of a recent paper by Solymos et al. 2018, it does not seem appropriate for these data, as all species have fewer than the 1000 detection sample size suggested by Solymos. So I have been struggling to determine whether using a function in the package 'unmarked' is appropriate or if I should be looking to program Distance. The purpose of my project is practical grassland bird habitat management and conservation. With unmarked, I am unsure which functions should be utilized and how to get the process going. I have reviewed various literature on the package, but would greatly appreciate any help here. Here is the structure for my data: 37 sites, 521 points, 2 survey visits in one year, 3 distance bands (0-50m, 50-100m, >100m), 5 - 1min time intervals-singing & non-singing detections recorded separately survey covariates: site_name, survey_yr, time since local sunrise, sky, wind, temp, surveyor habitat covariates: 29 variables: 12 different grassland community types (proportion), 10 disturbance types (proportion), cover: herb, shrub, bare (integer), height: herb, bare, shrub (integer) Thank you in advance for any help you can provide! David
  2. Hello, Rocky Mountain Bird Observatory is pleased to make available our 2011 Chihuahuan Desert Grassland Bird Report. This report includes annual and average density estimates for 29 grassland species from 2007-2011 in 16 Grassland Priority Conservation Areas spanning 9 states in Mexico and the US, in addition to other information. Visit our website to download the report (please be patient, it's a large file): http://rmbo.org/v3/OurWork/International/ChihuahuanDesertGrasslands.aspx Best, Arvind Panjabi International Program Director Rocky Mountain Bird Observatory Fort Collins, CO
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