Genetic differentiation between estuarine and open coast ecotypes of a dominant ecosystem engineer

Melinda A. Coleman, J. S. Clark, M. A. Doblin, M. J. Bishop, B. P. Kelaher

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Temperate intertidal shores globally are often dominated by habitat-forming seaweeds, but our knowledge of these systems is heavily biased towards northern hemisphere species. Rocky intertidal shores throughout Australia and New Zealand are dominated by a single monotypic species, Hormosira banksii. This species plays a key role in facilitating biodiversity on both rocky shores and estuarine habitats, yet we know little about the processes that structure populations. Herein we characterise the genetic diversity and structure of Hormosira and demonstrate strong restrictions to gene flow over small spatial scales, as well as between estuarine and open coast populations. Estuarine ecotypes were often genetically unique from nearby open coast populations, possibly due to extant reduced gene flow between habitats, founder effects and coastal geomorphology. Deviations from random mating in many locations suggest complex demographic processes are at play within shores, including clonality in estuarine populations. Strong isolation by distance in Hormosira suggests that spatial management of intertidal habitats will necessitate a network of broad-scale protection. Understanding patterns of genetic diversity and gene flow in this important ecosystem engineer will enhance the ability to manage, conserve and restore this key species into the future.

LanguageEnglish
Pages977–985
Number of pages9
JournalMarine and Freshwater Research
Volume70
Issue number7
Early online date18 Sep 2018
DOIs
Publication statusPublished - Jun 2019

Fingerprint

ecotype
ecotypes
genetic differentiation
gene flow
coasts
genetic variation
ecosystem
coast
habitat
habitats
founder effect
random mating
geomorphology
rocky shore
seaweed
genetic structure
population structure
macroalgae
Northern Hemisphere
demographic statistics

Keywords

  • asexual
  • clonality
  • diversity
  • foundation species
  • gene flow
  • Hormosira banksii
  • intertidal

Cite this

Coleman, Melinda A. ; Clark, J. S. ; Doblin, M. A. ; Bishop, M. J. ; Kelaher, B. P. / Genetic differentiation between estuarine and open coast ecotypes of a dominant ecosystem engineer. In: Marine and Freshwater Research. 2019 ; Vol. 70, No. 7. pp. 977–985.
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Genetic differentiation between estuarine and open coast ecotypes of a dominant ecosystem engineer. / Coleman, Melinda A.; Clark, J. S.; Doblin, M. A.; Bishop, M. J.; Kelaher, B. P.

In: Marine and Freshwater Research, Vol. 70, No. 7, 06.2019, p. 977–985.

Research output: Contribution to journalArticleResearchpeer-review

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