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Abstract
Animal tracking has become an effective way to identify where and when migratory species encounter threats
throughout their annual cycle. Yet, untracked or poorly tracked species and undiscoverable or inaccessible data
for the species that have been tracked mean that gaps in the knowledge of where and when species occur are still
an issue for conservation. These gaps in knowledge of species movements have been termed the “movement
shortfall”. Here, we quantify the movement shortfall for North American migratory birds by comprehensively
reviewing full annual cycle tracking data and identifying gaps and biases in how, where, and what species are
tracked with electronic tracking devices.
We found 30 species for which tracking is not feasible given body size
constraints, no data for 291 trackable species, and restricted or reduced data accessibility for an additional 59
species. Thus, despite the ability to track most species, the movement shortfall remains a constraint to informing
conservation strategies for 56 % of North American migratory bird species. The number increases to 65 % when
considering species with restricted or reduced data accessibility, further limiting access to this information.
Moreover, 23 % of the tracking data stems from low precision tracking technologies reducing the implementation
and effectiveness to conservation actions. A lack of species and population data hinders conservation and biases
management decisions, ultimately making inefficient use of conservation resources. We encourage researchers to
consider these gaps in their decisions about future tracking efforts, conservation management, and data archiving
practices.
Publication Date
September 4, 2023
PUBLICATION AVAILABLE AT:
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