Geolocators lead to better measures of timing and renesting in Black-tailed Godwits and reveal the bias of traditional observational methods

Mo Verhoeven, Jelle Loonstra, Alice McBride, Pablo Macias, Wiebe Kaspersma, Jos Hooijmeijer, Egbert Van Der Velde, Christiaan Both, Nathan Senner & Theunis Piersma
Long‐term population studies can identify changes in population dynamics over time. However, to realize meaningful conclusions, these studies rely on accurate measurements of individual traits and population characteristics. Here, we evaluate the accuracy of the observational methods used to measure reproductive traits in individually marked black‐tailed godwits (Limosa limosa limosa). By comparing estimates from traditional methods with data obtained from light‐level geolocators, we provide an accurate estimate of the likelihood of renesting in godwits and...
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