Emily L Weiser

Counts of Birds in Aerial Photos from Fall Waterfowl Surveys, Izembek Lagoon, Alaska, 2017-2019

This dataset includes tables summarizing image information and bird counts from the aerial digital images taken over open water at Izembek Lagoon in Alaska in fall 2017-2019. These summaries list one record per image and provide the camera parameters, latitude, longitude, altitude, and automated and manual counts representing the total number of birds in each taxon (brant, white-cheeked geese, emperor geese, gulls, and other birds) identified in the image. The original images (.JPG format) and annotations are provided in an accompanying USGS data release (Weiser et al. 2022).

Categories: Data; Tags: Aerial photography, Aerial surveys, Alaska, Alaska Peninsula, Animals/Vertebrates, All tags... Anser canagicus, Aquatic ecosystems, Biota, Birds, Branta bernicla, Branta hutchinsii, Coastal ecosystems, Ducks/Geese/Swans, Environment, Estuarine habitat, Image collections, Izembek Lagoon, Izembek National Wildlife Refuge, Migratory birds, Migratory species, Photography, Population dynamics, Relative abundance analysis, Tundra ecosystems, USGS Science Data Catalog (SDC), Waders/Gulls/Auks and Allies, Waterfowl, Wetland ecosystems, Wildlife, Wildlife Biology, Fewer tags

Data: Western United States

Evidence for a growing population of eastern migratory monarch butterflies is currently insufficient: changepoint analysis R code

This R code conducts the main changepoint analyses described in the manuscript titled “Evidence for a growing population of eastern migratory monarch butterflies is currently insufficient”, authored by W. E. Thogmartin, J. A. Szymanski, and E. L. Weiser. The code calculates step and segmented changepoints, checks model assumptions for fitted models, calculates the probability of a >=6.05 ha population given a mean expected population of 3.2 ha, calculates the number of additional years required to provide for a statistically significant trend in the event that the current data are not significant, and calculates the probability of continued increase.

The sampling locations provided here were selected as a two-stage Generalized Random Tessellation Stratified (GRTS) sample (Stevens & Olsen 2004). The first stage of the GRTS draw used a master sample developed by the North American Bat Monitoring Program (Loeb et al. 2015) from a 10 x 10 km grid placed over the conterminous U.S., Canada, and Mexico. Each 10 x 10 km grid cell (hereafter, master cell) was assigned a GRTS rank by NABat. The rank represents the priority order in which master cells should ideally be sampled. For the second stage of the draw, sampling points within a master cell were selected. Each point was defined as a 30 x 30 m cell of the GIS raster that defined monarch-relevant habitat. Sampling...

Categories: Data; Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Canada, Long-term monitoring, Mexico, Monarch Butterfly, Sampling design, All tags... Status and Trends, USGS Science Data Catalog (SDC), United States, biota, Fewer tags

The imagery and annotations presented here were generated while testing an aerial photographic survey design to improve repeatability, transparency, and estimation of variance for annual population estimates of geese staging at Izembek Lagoon, Alaska. This dataset includes 1) 131,031 .JPG images captured from a small fixed-wing occupied aircraft, usually at an altitude of about 457 m, over Izembek Lagoon; 2) annotations of objects (geese, ducks, and gulls) assigned by an automated algorithm, and 3) manually corrected annotations that were edited by project staff for only those photos automatically identified as containing geese of any species. The photos were captured at predetermined points to systematically sample...

Categories: Data; Tags: Aerial photography, Aerial surveys, Alaska, Alaska Peninsula, Animals/Vertebrates, All tags... Anser canagicus, Aquatic ecosystems, Biota, Birds, Branta bernicla, Branta hutchinsii, Coastal ecosystems, Ducks/Geese/Swans, Environment, Estuarine habitat, Image collections, Izembek Lagoon, Izembek National Wildlife Refuge, Migratory birds, Migratory species, Photography, Population dynamics, Relative abundance analysis, Tundra ecosystems, USGS Science Data Catalog (SDC), Waders/Gulls/Auks and Allies, Waterfowl, Wetland ecosystems, Wildlife, Wildlife Biology, Fewer tags