Global phylogeography and seascape genetics of the lemon sharks (genus Negaprion)

J. K. Schultz, K. A. Feldheim, S. H. Gruber, M. V. Ashley, T. M. McGovern, B. W. Bowen

Research output: Contribution to journalArticle

130 Citations (Scopus)

Abstract

Seascapes are complex environments, and populations are often isolated by factors other than distance. Here we investigate the role of coastal habitat preference and philopatry in shaping the distribution and population structure of lemon sharks. The genus Negaprion comprises the amphiatlantic lemon shark (N. brevirostris), with a relict population in the eastern Pacific, and its Indo-West Pacific sister species, the sicklefin lemon shark (N. acutidens). Analyzing 138 individuals throughout the range of N. brevirostris (N = 80) and N. acutidens (N = 58) at microsatellite loci (nine and six loci, respectively) and the mitochondrial control region, we find evidence of allopatric speciation corresponding to the Tethys Sea closure (10-14 million years ago) and isolation of the eastern Pacific N. brevirostris population via the emergence of the Isthmus of Panama (∼3.5 million years ago). There is significant isolation by oceanic distance (R2 = 0.89, P = 0.005), defined as the maximum distance travelled at depths greater than 200 m. We find no evidence for contemporary transatlantic gene flow (m, M = 0.00) across an oceanic distance of ∼2400 km. Negaprion acutidens populations in Australia and French Polynesia, separated by oceanic distances of at least 750 km, are moderately differentiated (FST = 0.070-0.087, P ≤ 0.001; ΦST = 0.00, P = 0.99), with South Pacific archipelagos probably serving as stepping stones for rare dispersal events. Migration between coastally linked N. brevirostris populations is indicated by nuclear (m = 0.31) but not mitochondrial (m < 0.001) analyses, possibly indicating female natal site fidelity. However, philopatry is equivocal in N. acutidens, which has the lowest control region diversity (h = 0.28) of any shark yet studied. Restricted oceanic dispersal and high coastal connectivity stress the importance of both local and international conservation efforts for these threatened sharks.

Original languageEnglish
Pages (from-to)5336-5348
Number of pages13
JournalMolecular Ecology
Volume17
Issue number24
DOIs
StatePublished - Dec 1 2008

Fingerprint

Negaprion
Negaprion brevirostris
Phylogeography
Sharks
phylogeography
shark
philopatry
Population
sharks
Polynesia
Panama
allopatric speciation
loci
site fidelity
French Polynesia
Gene Flow
habitat preferences
Tethys
Oceans and Seas
habitat selection

Keywords

  • Dispersal
  • Elasmobranchs
  • Fish
  • Marine landscape ecology
  • Vicariance

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Genetics

Cite this

Schultz, J. K., Feldheim, K. A., Gruber, S. H., Ashley, M. V., McGovern, T. M., & Bowen, B. W. (2008). Global phylogeography and seascape genetics of the lemon sharks (genus Negaprion). Molecular Ecology, 17(24), 5336-5348. https://doi.org/10.1111/j.1365-294X.2008.04000.x

Global phylogeography and seascape genetics of the lemon sharks (genus Negaprion). / Schultz, J. K.; Feldheim, K. A.; Gruber, S. H.; Ashley, M. V.; McGovern, T. M.; Bowen, B. W.

In: Molecular Ecology, Vol. 17, No. 24, 01.12.2008, p. 5336-5348.

Research output: Contribution to journalArticle

Schultz, JK, Feldheim, KA, Gruber, SH, Ashley, MV, McGovern, TM & Bowen, BW 2008, 'Global phylogeography and seascape genetics of the lemon sharks (genus Negaprion)', Molecular Ecology, vol. 17, no. 24, pp. 5336-5348. https://doi.org/10.1111/j.1365-294X.2008.04000.x
Schultz JK, Feldheim KA, Gruber SH, Ashley MV, McGovern TM, Bowen BW. Global phylogeography and seascape genetics of the lemon sharks (genus Negaprion). Molecular Ecology. 2008 Dec 1;17(24):5336-5348. https://doi.org/10.1111/j.1365-294X.2008.04000.x
Schultz, J. K. ; Feldheim, K. A. ; Gruber, S. H. ; Ashley, M. V. ; McGovern, T. M. ; Bowen, B. W. / Global phylogeography and seascape genetics of the lemon sharks (genus Negaprion). In: Molecular Ecology. 2008 ; Vol. 17, No. 24. pp. 5336-5348.
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