Geographic differences in vertical connectivity in the Caribbean coral Montastraea cavernosa despite high levels of horizontal connectivity at shallow depths

Xaymara M. Serrano, I. B. Baums, K. O'Reilly, T. B. Smith, R. J. Jones, T. L. Shearer, F. L D Nunes, Andrew C Baker

Research output: Contribution to journalArticle

56 Citations (Scopus)

Abstract

The deep reef refugia hypothesis proposes that deep reefs can act as local recruitment sources for shallow reefs following disturbance. To test this hypothesis, nine polymorphic DNA microsatellite loci were developed and used to assess vertical connectivity in 583 coral colonies of the Caribbean depth-generalist coral Montastraea cavernosa. Samples were collected from three depth zones (≤10, 15-20 and ≥25 m) at sites in Florida (within the Upper Keys, Lower Keys and Dry Tortugas), Bermuda, and the U.S. Virgin Islands. Migration rates were estimated to determine the probability of coral larval migration from shallow to deep and from deep to shallow. Finally, algal symbiont (Symbiodinium spp.) diversity and distribution were assessed in a subset of corals to test whether symbiont depth zonation might indicate limited vertical connectivity. Overall, analyses revealed significant genetic differentiation by depth in Florida, but not in Bermuda or the U.S. Virgin Islands, despite high levels of horizontal connectivity between these geographic locations at shallow depths. Within Florida, greater vertical connectivity was observed in the Dry Tortugas compared to the Lower or Upper Keys. However, at all sites, and regardless of the extent of vertical connectivity, migration occurred asymmetrically, with greater likelihood of migration from shallow to intermediate/deep habitats. Finally, most colonies hosted a single Symbiodinium type (C3), ruling out symbiont depth zonation of the dominant symbiont type as a structuring factor. Together, these findings suggest that the potential for shallow reefs to recover from deep-water refugia in M. cavernosa is location-specific, varying among and within geographic locations likely as a consequence of local hydrology.

Original languageEnglish
Pages (from-to)4226-4240
Number of pages15
JournalMolecular Ecology
Volume23
Issue number17
DOIs
StatePublished - Jan 1 2014

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Anthozoa
connectivity
corals
coral
Bermuda
symbiont
Geographic Locations
symbionts
reefs
Virgin Islands of the United States
reef
Islands
Symbiodinium
Hydrology
refugium
refuge habitats
zonation
Microsatellite Repeats
Ecosystem
generalist

Keywords

  • climate change
  • cnidarians
  • conservation genetics
  • deep reef refugia hypothesis
  • great star coral
  • mesophotic
  • population genetics - empirical

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Genetics

Cite this

Geographic differences in vertical connectivity in the Caribbean coral Montastraea cavernosa despite high levels of horizontal connectivity at shallow depths. / Serrano, Xaymara M.; Baums, I. B.; O'Reilly, K.; Smith, T. B.; Jones, R. J.; Shearer, T. L.; Nunes, F. L D; Baker, Andrew C.

In: Molecular Ecology, Vol. 23, No. 17, 01.01.2014, p. 4226-4240.

Research output: Contribution to journalArticle

Serrano, Xaymara M. ; Baums, I. B. ; O'Reilly, K. ; Smith, T. B. ; Jones, R. J. ; Shearer, T. L. ; Nunes, F. L D ; Baker, Andrew C. / Geographic differences in vertical connectivity in the Caribbean coral Montastraea cavernosa despite high levels of horizontal connectivity at shallow depths. In: Molecular Ecology. 2014 ; Vol. 23, No. 17. pp. 4226-4240.
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