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A standardised method for estimating the level of visible debris in bird nests
journal contribution
posted on 2023-05-21, 01:55 authored by Megan Grant, O'Hanlon, NJ, Jennifer Lavers, Masden, EA, James, NA, Alexander BondAlexander BondUnlike records of plastic ingestion and entanglement in seabirds which date back to the 1960s, the literature regarding debris in bird nests is comparatively limited. It is important to identify standardised methods early so that data are collected in a consistent manner, ensuring that future studies can be comparable. Here, we outline a method that can be applied to photographs for estimating the proportion of visible debris at the surface of a nest. This method uses ImageJ software to superimpose a grid onto a photograph of a nest/s. The number of cells with and without debris are then counted. Our proposed method is repeatable, straightforward, and accessible. We optimised the method to estimate the level of visible debris in Northern Gannet (Morus bassanus) nests, however, with some modification (i.e., adjustment of grid cell size), it could be applied to other seabird species, and terrestrial birds, that incorporate debris within nests.
History
Publication title
Marine Pollution BulletinVolume
172Article number
112889Number
112889Pagination
1-7ISSN
0025-326XDepartment/School
Institute for Marine and Antarctic StudiesPublisher
Pergamon-Elsevier Science LtdPlace of publication
The Boulevard, Langford Lane, Kidlington, Oxford, England, Ox5 1GbRights statement
Crown Copyright © 2021 Published by Elsevier Ltd. All rights reserved.Repository Status
- Restricted