Is Montipora dilatata an endangered coral species or an ecotype? Genes and skeletal microstructure lump seven Hawaiian species into four groups
Is Montipora dilatata an endangered coral species or an ecotype? Genes and skeletal microstructure lump seven Hawaiian species into four groups
Author
Forsman, Z. H.
Concepcion, G. T.
Haverkort, R. D.
Shaw, Ross
Maragos, J. E.
Toonen, R. J.
Faculty Advisor
Date
2010
Keywords
coral species , Hawaii
Abstract (summary)
Montipora dilatata is considered to be one of the rarest corals known. Thought to be
endemic to Hawaii, only a few colonies have ever been found despite extensive surveys.
Endangered species status would have major conservation implications; however, coral species
boundaries are poorly understood. In order to examine genetic and morphological variation in
Hawaiian Montipora, a suite of molecular markers (mitochondrial: COI, CR, Cyt-B, 16S,
ATP6; nuclear: ATPsβ, ITS), in addition to a suite of measurements on skeletal microstructure,
were examined. The ITS region and mitochondrial markers revealed four distinct clades: I) M.
patula/M. verilli, II) M. incrassata, III) M. capitata, IV) M. dilatata/M. flabellata/M. turgescens.
The nuclear ATPsβ intron tree had several exceptions that are generally interpreted as resulting
from recent hybridization between clades or incomplete lineage sorting. Since the multicopy
nuclear ITS region was concordant with the mitochondrial data, incomplete lineage sorting of
the ATPsβ intron is a more likely explanation. Principal components analysis (PCA) of
microstructure measurements agreed with the genetic clades rather than the nominal taxa.
These species groups therefore either represent recent or insipient (CA <1MYA) species or
morphological variants of the same biological species. These clades are likely to occur outside
of Hawaii according to mitochondrial control region haplotypes from previous studies.
Common garden experiments were conducted on distinct morphotypes of M. capitata to test the
hypothesis that micro-skeletal traits can be phenotypically plastic in this genus. Although the
experiment suffered high mortality from parasitic flatworms, verrucae (rice-grain sized bumps)
were documented to form on formerly smooth colonies, indicating plasticity. This study
contributes towards understanding the relationship between genetic and morphological variation
in this taxonomically challenging group, which is essential for effective conservation and the
key to understanding the evolution and biodiversity of reef building corals.
Publication Information
Forsman, Z.H., Concepcion, G.T., Haverkort, R.D., Shaw, R.W., Maragos, J.E., & Toonen, R.J. (2010). Is Montipora dilatata an endangered coral species or an ecotype ? Genes and skeletal microstructure lump seven Hawaiian species into four groups. Retrieved from https://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.365.3034&rep=rep1&type=pdf
DOI
Notes
Item Type
Report
Language
English
Rights
All Rights Reserved