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- Title
Pleistocene diversification of the Pomacentrus coelestis species complex (Pisces: Pomacentridae): historical biogeography and species boundaries.
- Authors
Sorenson, Laurie; Allen, Gerald; Erdmann, Mark; Dai, Chang-Feng; Liu, Shang-Yin
- Abstract
Pleistocene eustatic changes in sea level are often invoked to explain genetic divergence among marine organisms. However, molecular phylogenies have revealed relatively few examples of speciation events dating to the Pleistocene. We present a species-level hypothesis of the timing of evolution for the Pomacentrus coelestis species complex (Pomacentridae), based on the nuclear S7 intron and the mitochondrial Cytb gene, and reconstruct ancestral range distributions across the timetree. Ancestral range reconstruction suggests the complex originated in the Coral Triangle and East Indian Ocean, with subsequent range expansion outward from this region. We suggest that land barriers to dispersal (e.g., Indo-Pacific barrier) may be responsible for the divergence between Indian ( P. alleni, P. similis, P. caeruleopunctatus, and P. caeruleus) and Pacific ( P. micronesicus, P. auriventris, and P. coelestis) species groups, and subsequent isolation by Pleistocene sea-level fluctuations in certain areas of the Coral Triangle (glacial refugia) may play an important role in the diversification of this species complex. Additionally, our analyses show cryptic lineages within P. micronesicus and highlight the need for comprehensive sampling within and among species to reveal recent speciation events.
- Subjects
BIODIVERSITY; POMACENTRUS; POMACENTRIDAE; BIOGEOGRAPHY; MARINE organisms; INTRONS
- Publication
Marine Biology, 2014, Vol 161, Issue 11, p2495
- ISSN
0025-3162
- Publication type
Article
- DOI
10.1007/s00227-014-2521-8