Hierarchical genetic structuring in the cool boreal kelp, Laminaria digitata: implications for conservation and management
Authors/Creators
Nathan G. King
Niall J. McKeown
Dan A. Smale
Sunny Bradbury
Thomas Stamp
Alexander Jüterbock
Hrönn Egilsdóttir
Emily A. Groves
Pippa J. Moore, Edith Cowan University
Abstract
VC International Council for the Exploration of the Sea 2020. All rights reserved. Kelp are foundation species threatened by ongoing warming trends and increased harvesting pressure. This emphasizes the need to study genetic structure over various spatial scales to resolve demographic and genetic processes underpinning resilience. Here, we investigate the genetic diversity in the kelp, Laminaria digitata, in previously understudied southern (trailing-edge) and northern (range-centre) regions in the Northeastern Atlantic Ocean. There was strong hierarchical spatial structuring with significantly lower genetic variability and gene flow among southern populations. As these span the area of the Hurd’s deep Pleistocene glacial refuge, the current low variation likely reflects a fraction of previous levels that has been eroded at the species southern edge. Northern variability and private alleles also indicate contributions from cryptic northern glacial refugia. Contrary to expectations of a positive relationship between neutral genetic diversity and resilience, a previous study reported individuals from the same genetically impoverished southern populations to be better adapted to cope with thermal stress than northern individuals. This not only demonstrates that neutral genetic diversity may be a poor indicator of resilience to environmental stress but also confirms that extirpation of southern populations will result in the loss of evolved, not just potential, adaptations for resilience.
RAS ID
35240
Document Type
Journal Article
Date of Publication
2020
ISSN
10543139
Volume
77
Issue
5
Funding Information
British Phycological Society Marie Curie Career Integration Grant NERC/Newton Fun Latin American Biodiversity Programme UKRI Future Leaders Fellowship
School
Centre for Marine Ecosystems Research / School of Science
Copyright
subscription content
Publisher
Oxford University Press
Recommended Citation
King, N. G., McKeown, N. J., Smale, D. A., Bradbury, S., Stamp, T., Jüterbock, A., Egilsdóttir, H., Groves, E. A., & Moore, P. J. (2020). Hierarchical genetic structuring in the cool boreal kelp, Laminaria digitata: implications for conservation and management. DOI: https://doi.org/10.1093/icesjms/fsaa055
Comments
King, N. G., McKeown, N. J., Smale, D. A., Bradbury, S., Stamp, T., Jüterbock, A., ... Moore, P. J. (2020). Hierarchical genetic structuring in the cool boreal kelp, Laminaria digitata: Implications for conservation and management. ICES Journal of Marine Science, 77(5), 1906-1913. https://doi.org/10.1093/icesjms/fsaa055