Abstract
Context
Understanding species–genetic diversity relationships is key to foster holistic conservation approaches aimed at preserving biodiversity across multiple dimensions. Despite the facts that genetic and species diversity are likely to be spatially structured and that species–genetic diversity correlations (SGDCs) reveal coincident spatial patterns between the two diversity levels, spatial autocorrelation has been largely overlooked.
Objectives
We assessed the benefits of investigating species–genetic diversity relationships through a spatial framework using high Andean wetlands from Chile as a case study system.
Methods
Genetic diversity was estimated using amplified fragment length polymorphism markers for five abundant species and species diversity was assessed as taxonomic richness for two communities (plants and benthic macroinvertebrates). We tested SGDCs using Moran Spectral Randomizations (MSR), and used a causal modelling procedure to elucidate relationships between species and genetic diversity and their coincident spatial structures.
Results
While traditional correlation tests detected significant SGDCs in most cases (i.e. nine), only three species–genetic relationships reached significance or borderline significance with the MSR approach. In all these cases, genetic and species diversity displayed similar spatial autocorrelation patterns. The causal modelling analyses suggested direct effects of genetic diversity on plant richness for species involved in nutrient cycling.
Conclusions
Our study provides new perspectives on species–genetic diversity relationships in high Andean wetlands. In addition, it demonstrates the usefulness of causal modelling approaches and the importance of incorporating spatial information to advance understanding of the processes driving both species and genetic diversity, as well as their interactions.
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Data availability
Raw data of the AFLP genotypes (i.e. band presence and absence) for each of the five species are available at https://doi.org/10.5061/dryad.4vr37. Benthic macroinvertebrate data are reported in Table S1 and plant community data can be found in Dryad at https://doi.org/10.5061/dryad.3p1tj06.
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Acknowledgements
We thank Craig Weideman for revising the English of the manuscript. La Junta de Vigilancia del Elqui, la Comunidad Agrícola los Huascoaltinos, La Sociedad de Parceleros de Coiron, La Sociedad de Parceleros de San Agustın, La Sociedad de Parceleros Hacienda Illapel, la Hacienda Tulahuen Oriente, la Hacienda El Maiten de Pedregal and la Hacienda El Bosque kindly gave access to private wetlands. E. Álvarez, R. Osorio, G. Arancio, C. Verdugo, M. Rivera, L. Cifuentes, R. Hereme and A. Troncoso participated in fieldwork or data production. We also thank two anonymous reviewers for insightful comments and discussions on previous versions of the manuscript. This work was financed by the Dirección de Investigación y Desarrollo de la Universidad de La Serena (DIDULS), DIDULS Regular PR192126.
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This work was financed by the Dirección de Investigación y Desarrollo de la Universidad de La Serena (DIDULS), DIDULS Regular PR192126.
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AB conceived the study; AB and AL analysed the data; AB led the writing of the manuscript and wrote the first draft of the manuscript. NG and AB revised the first draft and all authors contributed to revisions of the final draft and gave final approval for publication.
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Bertin, A., Lozada, A. & Gouin, N. Species–genetic diversity correlations through the lens of spatial autocorrelation: insights from high Andean wetlands. Landsc Ecol 37, 2399–2412 (2022). https://doi.org/10.1007/s10980-022-01480-2
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DOI: https://doi.org/10.1007/s10980-022-01480-2