These data and code were collected to support the development of a modeling framework that integrates local daily weather conditions and land cover with individual energetics and morphology to simulate mallard (Anas platyrhynchos) and northern pintail (Anas acuta) migration across the Northern Hemisphere.The simulated birds move across a discretized landscape of 20 by 20 mile nodes. Provided data and code allow for a model to simulate avian migration from September 1st, 2019, through December 31st, 2020. There are 6 zip files included in this data release. 1. MigrationModel_2023.zip contains the model code used to simulate bird movement. It requires the files NodeSpecificData_2019.txt and ENV_MAT.csv to function. 2. NodeSpecificData_2019.zip contains static landscape information for the terrestrial Northern Hemisphere. For each node, the file has information regarding land cover types and areas, forage quality and availability, and capability as breeding range. 3. ENV_MAT.zip contains daily averages for temperature, weather severity index, air density, snow depth, windspeed, and wind direction for each node throughout the study period. 4. mallardtelemetrydata.zip contains satellite telemetry data for mallards that were tagged in Louisiana in the winter of 2019/2020. These data were used to validate the model by comparing to simulated mallard movement. 5. N_ABUND_ALL.zip contains example output from the migration model. It has expected abundance of mallards and pintails in each node on each day of simulation. 6. BCTable_full.zip contains simulated predictions for the distribution of excess energy availability (represented as body condition) across all mallards and pintails in the Northern Hemisphere on each day of simulation.

These data and code were collected to support the development of a modeling framework that integrates local daily weather conditions and land cover with individual energetics and morphology to simulate mallard (Anas platyrhynchos) and northern pintail (Anas acuta) migration across the Northern Hemisphere.The simulated birds move across a discretized landscape of 20 by 20 mile nodes. Provided data and code allow for a model to simulate avian migration from September 1st, 2019, through December 31st, 2020. There are 6 zip files included in this data release. 1. MigrationModel_2023.zip contains the model code used to simulate bird movement. It requires the files NodeSpecificData_2019.txt and ENV_MAT.csv to function. 2. NodeSpecificData_2019.zip contains static landscape information for the terrestrial Northern Hemisphere. For each node, the file has information regarding land cover types and areas, forage quality and availability, and capability as breeding range. 3. ENV_MAT.zip contains daily averages for temperature, weather severity index, air density, snow depth, windspeed, and wind direction for each node throughout the study period. 4. mallardtelemetrydata.zip contains satellite telemetry data for mallards that were tagged in Louisiana in the winter of 2019/2020. These data were used to validate the model by comparing to simulated mallard movement. 5. N_ABUND_ALL.zip contains example output from the migration model. It has expected abundance of mallards and pintails in each node on each day of simulation. 6. BCTable_full.zip contains simulated predictions for the distribution of excess energy availability (represented as body condition) across all mallards and pintails in the Northern Hemisphere on each day of simulation.

Data and R Code for manuscript titled "Population Dynamics and Harvest Management of Eastern Mallards"

The mallard (Anas platyrhynchos) is an abundant and wide-spread duck species that exhibits considerable variation in migratory behavior due to a relatively large body size and behavioral plasticity in habitat use. Understanding migration and other movements of mallards has societal interest in a wildlife management context because mallards are a preferred species of waterfowl by hunters and have the largest annual harvest of all duck species in the United States. We monitored juvenile mallards during autumn-winters 2018-2019 and 2019-2020 to determine factors associated with timing, distance, and direction of regional and migration movements during autumn-winter across the midcontinent of North America.

The mallard (Anas platyrhynchos) is an abundant and wide-spread duck species that exhibits considerable variation in migratory behavior due to a relatively large body size and behavioral plasticity in habitat use. Understanding migration and other movements of mallards has societal interest in a wildlife management context because mallards are a preferred species of waterfowl by hunters and have the largest annual harvest of all duck species in the United States. We monitored juvenile mallards during autumn-winters 2018-2019 and 2019-2020 to determine factors associated with timing, distance, and direction of regional and migration movements during autumn-winter across the midcontinent of North America.

This dataset describes responses to flushes by surveyors and predators for mallard and gadwall hens nesting on the Grizzly Island Wildlife Area, Suisun Marsh, California in 2015 through 2018. It includes the start time and duration of recesses, as well as the cause of recess initiation and responses of hens to various trapping activities at the nest site.

This dataset describes incubation recess timing for mallard and gadwall hens nesting in Grizzly Island Wildlife Area in breeding seasons 2015-2017. It includes the start time, end time, and duration of recesses.

This dataset describes incubation recess timing for mallard and gadwall hens nesting in Grizzly Island Wildlife Area in breeding seasons 2015-2017. It includes the start time, end time, and duration of recesses.

Body mass in overwintering waterfowl is an important fitness attribute as it affects winter survival, timing of spring migration, and subsequent reproductive success. Recent research in Europe and the western United States indicates body mass of mallards (Anas platyrhynchos) has increased from the late 1960s to early 2000s. The underlying mechanism is currently unknown; however, researchers hypothesize that increases are due to a more benign winter climate, increased food availability through natural and artificial flooding, introgression of wild mallard populations by game-farm mallards, or shifting of wintering distributions northward. Further investigation of factors related to winter mallard body mass increases and whether this phenomenon is occurring in other major flyways could increase understanding of intrinsic and extrinsic variables influencing waterfowl fitness. We collected and analyzed mallard body mass data in the Lower Mississippi Alluvial Valley from 1979 to 2021 to determine sources of temporal variation. We measured hunter-harvested mallards from private hunting clubs, public hunting areas, and duck-plucking businesses. Mallard body mass increased by approximately 6% among all age-sex classes from 1979 to 2021. We also compiled weather data (rainfall [cm], weather severity index information [WSI], river gage discharge [cfs] and height [m]) to relate to mallard body mass measurements.

This data release provides data from the 2016 Lesmeister et al. technical report and Mathematica and Python analytical code to model co-occurrence effects between barred (Strix varia) and northern spotted (Strix occidentalis caurina) owls. This data release, containing sample data set and code, is designed to facilitate reproducibility of analyses associated with the manuscript titled "Modeling competition co-occurrence effects between the invasive barred owl and imperiled northern spotted owl", published in Ecological Applications in 2025.