The Impact of Drought on Waterbirds and Their Wetland Habitats in California’s Central Valley

California’s Central Valley is a nexus for water resources in the state, draining the Sacramento and San Joaquin River watersheds. Urban centers, agricultural operations, and the environment all compete for limited water, and demand is expected to only increase as the population grows and agriculture intensifies. At the same time, the water supply is projected to decrease as temperatures rise, precipitation patterns change, and the frequency of extreme droughts increases. The Central Valley also provides critical wetland habitats to migratory waterbirds, and wetland managers require information on how to best use water resources to support wildlife objectives, particularly during drought. This project seeks to...

Categories: Project; Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: 2015, Birds, Birds, CASC, Completed, All tags... Drought, Drought, Drought, Fire and Extreme Weather, Drought, Fire and Extreme Weather, Landscapes, Landscapes, Other Landscapes, Other Landscapes, Projects by Region, Southwest, Southwest CASC, Water, Coasts and Ice, Water, Coasts and Ice, Wetlands, Wetlands, Wildlife and Plants, Wildlife and Plants, bioenergetics, drought, habitat management, water, waterfowl, wetlands, Fewer tags

Aerial Photo Imagery from Fall Waterfowl Surveys, Izembek Lagoon, Alaska, 2017-2019

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...

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:ASC449, Waders/Gulls/Auks and Allies, Waterfowl, Wetland ecosystems, Wildlife, Fewer tags

Data and Model-Based Estimates from Black Brant (Branta bernicla nigricans) Fall Age Ratio Surveys at Izembek Lagoon, Alaska

These data are in two tables relating to fall age ratios (number of juvenile birds : total birds aged) of Black Brant (Branta bernicla nigricans) staging in Izembek Lagoon, Alaska, since 1963. The first table is observation data for the age classes of Black Brant during surveys, and associated survey characteristics. The second table contains model-based estimates of age ratios by year along with Standard Error (SE), and 95% Bayesian credible intervals around estimates.

Tags: Alaska, Animal populations, Animals/Vertebrates, Biota, Birds, All tags... Black Brant, Brent Goose, Computational methods, Ecological dynamics, Environment, Izembek Lagoon, Izembek National Wildlife Refuge, Mathematical modeling, Migratory birds, Population dynamics, Species life history, Species/population interactions, USGS:ASC256, Waterfowl, Wildlife biology, Fewer tags