Volume 43, Issue 5 pp. 1032-1044
Original Article

Testing dispersal limits in the sea: range-wide phylogeography of the pronghorn spiny lobster Panulirus penicillatus

Matthew Iacchei

Corresponding Author

Matthew Iacchei

Hawai‘i Institute of Marine Biology, Kāne‘ohe, HI, 96744 USA

Department of Oceanography, School of Ocean and Earth Science and Technology, University of Hawai‘i at Mānoa, Honolulu, HI, 96822 USA

Correspondence: Matthew Iacchei, Department of Oceanography, School of Ocean and Earth Science and Technology, University of Hawai'i at Mānoa, 1000 Pope Rd., Honolulu, HI 96822, USA.

E-mail: [email protected]

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Michelle R. Gaither

Michelle R. Gaither

School of Biological and Biomedical Sciences, Durham University, Durham, DH1 3LE UK

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Brian W. Bowen

Brian W. Bowen

Hawai‘i Institute of Marine Biology, Kāne‘ohe, HI, 96744 USA

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Robert J. Toonen

Robert J. Toonen

Hawai‘i Institute of Marine Biology, Kāne‘ohe, HI, 96744 USA

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First published: 11 January 2016
Citations: 33
Editor: Gustav Paulay

Abstract

Aim

To resolve phylogeographical partitions in the pronghorn spiny lobster, Panulirus penicillatus, which has a nine-month pelagic larval phase and the broadest distribution among spiny lobsters. With samples from the Red Sea to the East Pacific, we test genetic partitions across two-thirds of the planet, in a species with one of the longest pelagic phases.

Location

Red Sea, Indian and Pacific Oceans.

Methods

A fragment of the mtDNA cytochrome c oxidase subunit I gene (COI) was resolved in 774 individuals from 28 locations, plus 55 sequences (10 locations) from public databases. Portions of COI, 12S and 16S mtDNA regions were resolved for phylogenetic analyses on a subset of individuals. Phylogenetic and population-level analyses were used to detect evolutionary partitions and dispersal barriers.

Results

Significant population structuring was detected (overall ΦST = 0.310, < 0.001). Samples from the Red Sea and East Pacific Provinces (western and eastern range edges) comprise distinct phylogenetic lineages, divergent at d = 1.1% and 1.8%, respectively, from the Indo-Pacific. Coalescent analyses indicate a Pleistocene isolation for the Red Sea (0.71 Ma) and East Pacific (1.52 Ma). Excluding the Red Sea and East Pacific, structure across the rest of the range was comparatively low, but significant (ΦST = 0.018, < 0.001).

Main conclusions

The Red Sea and East Pacific populations are phylogenetically distinct from populations elsewhere in the range. The East Pacific population diverged earliest, and may represent a distinct subspecies. Phylogeographical divisions align with the major Indo-Pacific biogeographical barriers, and with subsets of provincial designations from two frameworks: one based on levels of endemism and one on species composition. Tropical and temperate regions in the Pacific are significantly differentiated, potentially indicating an ecological partition. Isolation at eastern and western peripheral provinces may serve as a starting point for evolutionary diversification within this group.

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