DOI: 10.5061/dryad.37pvmcvv1
title: Fitness consequences of anthropogenic subsidies for a partially migratory wading bird

description: Human activities are forcing wildlife to confront selective pressures
 different from those under which they evolved. In seasonal environments,
 migration evolved as an adaptation to fluctuating resource availability.
 Anthropogenic subsidies modify resource dynamics by providing a steady
 food source that is not subject to seasonality. Globally, many migratory
 populations are becoming increasingly resident in response to food
 supplementation. While these population-level shifts are assumed to arise
 from changing fitness consequences of individual behavior in response to
 resource dynamics, these mechanisms are often difficult to quantify and
 disentangle. Here, we quantified fitness consequences of responses to
 anthropogenic subsidies in partially migratory wood storks (Mycteria
 americana) in the heavily urbanized southeastern U.S. First, we tested
 whether individual migratory behavior is linked to different responses to
 anthropogenic subsidies. Second, we quantified fitness consequences of
 these behavioral responses. We found that, in our system, migration and
 residency are alternative behavioral tactics associated with different
 responses to food supplementation. In turn, the use of anthropogenic
 resources alters a fitness component by enhancing nest survival. These
 results provide a mechanistic examination of how animals may respond to
 human-modified resource dynamics and how fitness consequences of
 individual tactics may translate into behavioral shifts at the population
 level.
description: # Fitness consequences of anthropogenic subsidies for a partially
 migratory wading bird
 [https://doi.org/10.5061/dryad.37pvmcvv1](https://doi.org/10.5061/dryad.37pvmcvv1) ## Description of the data and file structure This repository contains data used in Picardi, S., Frederick, P.C., Basille, M. “Fitness consequences of anthropogenic subsidies for a partially migratory wading bird”. Proceedings of the Royal Society B. 2024. DOI: 10.1098/rspb.2024.1530 ### Files and variables #### File: GPS\_WOST\_adults.csv **Description:** GPS tracking data for 65 adult wood storks in the Southeastern U.S. from 2005 to 2018 ##### Variables * id: Unique identifier of individual * burst: Unique identifier of individual-year * date: Date-time of GPS location * long: Longitude of GPS location * lat: Latitude of GPS location #### File: mig\_yrs.csv **Description:** Annual migratory status of the tracked individuals, assigned using methods described in Picardi et al. 2020, [https://doi.org/10.1002/ecs2.3054](https://doi.org/10.1002/ecs2.3054) ##### Variables * stork: Unique identifier of individual * year: Year used to define migratory status * start: Start date of current year * end: End date of current year * choice: Migratory status in current year ## Code/software Code to reproduce the analysis is included in file **WOST_2024_code.zip** and also available at [https://github.com/picardis/WOST_2024](https://github.com/picardis/WOST_2024) ## Access information The GPS data was derived from the following sources: * Basille M, Borkhataria RR, Bryan AL, Bucklin DN, Picardi S, Frederick PC. 2021. Data from: Study "Wood stork (Mycteria americana) Southeastern US 2004–2019". Movebank Data Repository. [https://doi.org/10.5441/001/1.r0h6725k](https://doi.org/10.5441/001/1.r0h6725k)