Data from: Peregrine Falcons shift mean and variance in provisioning in response to increasing brood demand ...

• Main Authors: McKinnon, Rebekah, Hawkshaw, Kevin, Hedlin, Erik, Nakagawa, Shinichi, Mathot, Kimberley
• Format: Dataset
• Language: English
• Published: Dryad 2023
• Subjects: FOS Biological sciences; Animal behavior; provisioning; raptor; risk-sensitivity; variance-sensitivity; Arctic; Nunavut; Rankin Inlet; Falco peregrinus
• Online Access: https://dx.doi.org/10.5061/dryad.6hdr7sr6q; https://datadryad.org/stash/dataset/doi:10.5061/dryad.6hdr7sr6q

The hierarchical model of provisioning posits that parents employ a strategic, sequential use of three provisioning tactics as offspring demand increases (e.g., due to increasing brood size and age). Namely, increasing delivery rate (reducing intervals between provisioning visits), expanding provisioned diet breadth, and adopting variance-sensitive provisioning. We evaluated this model in an Arctic breeding population of Peregrine falcons (Falco peregrinus tundrius) by analyzing changes in inter-visit-intervals (IVIs) and residual variance in IVIs across 7 study years. Data was collected using motion-sensitive nest camera images and analyzed using Bayesian mixed effect models. We found strong support for a decrease in IVIs (i.e., increase in delivery rates) between provisioning visits and an increase in residual variance in IVIs with increasing nestling age, consistent with the notion that peregrines shift to variance-prone provisioning strategies with increasing nestling demand. However, support for ... : Data was collected from nest camera images over a period of 7 consecutive breeding seasons in Rankin Inlet, Nunavut from 2013-2019. Cameras were placed within 1m of the nest scrape and data was processed post field-season. Please see McKinnon et al., (2024) for the full methodological details. ...