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Predictors of taxonomic splitting and its role in primate conservation

View ORCID ProfileMaria J.A. Creighton, Alice Q. Luo, Simon M. Reader, Arne Ø. Mooers
doi: https://doi.org/10.1101/2021.09.10.459781
Maria J.A. Creighton
aDepartment of Biology, McGill University, Montreal, Quebec, Canada
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  • For correspondence: maria.creighton@mail.mcgill.ca
Alice Q. Luo
aDepartment of Biology, McGill University, Montreal, Quebec, Canada
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Simon M. Reader
aDepartment of Biology, McGill University, Montreal, Quebec, Canada
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Arne Ø. Mooers
bDepartment of Biological Sciences, Simon Fraser University, Burnaby, British Columbia, Canada
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Abstract

Species are the main unit used to measure biodiversity, but different preferred diagnostic criteria can lead to very different delineations. For instance, named primate species have more than doubled in number since 1982. Such increases have been attributed to a shift away from the ′biological species concept′ (BSC) in favour of less inclusive species criteria. Critics of recent changes in primate taxonomy have suggested taxonomic splitting may be biased toward certain clades and have unfavourable consequences for conservation. Here, we explore predictors of taxonomic splitting across primate taxa since the initial shift away from the BSC nearly 40 years ago. We do not find evidence that diversification rate, the rate of lineage formation over evolutionary time, is significantly linked to splitting, contrary to expectations if new species concepts and taxonomic methods identify incipient species. We also do not find evidence that research effort in fields where work has been suggested to motivate splitting is associated with increases in species numbers among genera. To test the suggestion that splitting groups is likely to increase their perceived risk of extinction, we test whether genera that have undergone more splitting have also observed a greater increase in their proportion of threatened species since the initial shift away from traditional taxonomic methods. We find no cohesive signal of taxonomic splitting leading to higher threat probabilities across primate genera. Overall, this analysis sends a positive message: threat statuses of primate species are not being overwhelmingly affected by splitting. Regardless, we echo warnings that it is unwise for conservation to be reliant on taxonomic stability. Species (however defined) are not independent from one another, thus, monitoring and managing them as such may not meet the overarching goal of conserving biodiversity.

Competing Interest Statement

The authors have declared no competing interest.

Footnotes

  • This updated version of the manuscript focuses on the causes and consequences of taxonomic splitting, and removes emphasis from the comparison of species concepts.

Copyright 
The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY-NC-ND 4.0 International license.
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Posted June 19, 2022.
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Predictors of taxonomic splitting and its role in primate conservation
Maria J.A. Creighton, Alice Q. Luo, Simon M. Reader, Arne Ø. Mooers
bioRxiv 2021.09.10.459781; doi: https://doi.org/10.1101/2021.09.10.459781
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Predictors of taxonomic splitting and its role in primate conservation
Maria J.A. Creighton, Alice Q. Luo, Simon M. Reader, Arne Ø. Mooers
bioRxiv 2021.09.10.459781; doi: https://doi.org/10.1101/2021.09.10.459781

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