Postglacial Colonization of Northern Coastal Habitat by Bottlenose Dolphins: a Marine Leading-Edge Expansion?

Milaja Nykänen; Kristin Kaschner; Willy Dabin; Andrew Brownlow; Nicholas J Davison; Rob Deaville; Cristina Garilao; Kathleen Kesner-Reyes; M Thomas P Gilbert; Rod Penrose; Valentina Islas-Villanueva; Nathan Wales; Simon N. Ingram; Emer Rogan; Marie Louis; Andrew D. Foote

doi:10.1093/jhered/esz039

Postglacial Colonization of Northern Coastal Habitat by Bottlenose Dolphins: a Marine Leading-Edge Expansion?

Milaja Nykänen, Kristin Kaschner, Willy Dabin, Andrew Brownlow, Nicholas J Davison, Rob Deaville, Cristina Garilao, Kathleen Kesner-Reyes, M Thomas P Gilbert, Rod Penrose, Valentina Islas-Villanueva, Nathan Wales, Simon N. Ingram, Emer Rogan, Marie Louis, Andrew D. Foote

3 Citations (Scopus)

Abstract

Oscillations in the Earth's temperature and the subsequent retreating and advancing of ice-sheets around the polar regions are thought to have played an important role in shaping the distribution and genetic structuring of contemporary high-latitude populations. After the Last Glacial Maximum (LGM), retreating of the ice-sheets would have enabled early colonizers to rapidly occupy suitable niches to the exclusion of other conspecifics, thereby reducing genetic diversity at the leading-edge. Bottlenose dolphins (genus Tursiops) form distinct coastal and pelagic ecotypes, with finer-scale genetic structuring observed within each ecotype. We reconstruct the postglacial colonization of the Northeast Atlantic (NEA) by bottlenose dolphins using habitat modeling and phylogenetics. The AquaMaps model hindcasted suitable habitat for the LGM in the Atlantic lower latitude waters and parts of the Mediterranean Sea. The time-calibrated phylogeny, constructed with 86 complete mitochondrial genomes including 30 generated for this study and created using a multispecies coalescent model, suggests that the expansion to the available coastal habitat in the NEA happened via founder events starting ~15 000 years ago (95% highest posterior density interval: 4 900-26 400). The founders of the 2 distinct coastal NEA populations comprised as few as 2 maternal lineages that originated from the pelagic population. The low effective population size and genetic diversity estimated for the shared ancestral coastal population subsequent to divergence from the pelagic source population are consistent with leading-edge expansion. These findings highlight the legacy of the Late Pleistocene glacial cycles on the genetic structuring and diversity of contemporary populations.

Original language	English
Journal	The Journal of Heredity
Volume	110
Issue number	6
Pages (from-to)	662-674
ISSN	0022-1503
DOIs	https://doi.org/10.1093/jhered/esz039
Publication status	Published - 1 Sept 2019

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Nykänen, M., Kaschner, K., Dabin, W., Brownlow, A., Davison, N. J., Deaville, R., Garilao, C., Kesner-Reyes, K., Gilbert, M. T. P., Penrose, R., Islas-Villanueva, V., Wales, N., Ingram, S. N., Rogan, E., Louis, M., & Foote, A. D. (2019). Postglacial Colonization of Northern Coastal Habitat by Bottlenose Dolphins: a Marine Leading-Edge Expansion? The Journal of Heredity, 110(6), 662-674. https://doi.org/10.1093/jhered/esz039

Nykänen, M, Kaschner, K, Dabin, W, Brownlow, A, Davison, NJ, Deaville, R, Garilao, C, Kesner-Reyes, K, Gilbert, MTP, Penrose, R, Islas-Villanueva, V, Wales, N, Ingram, SN, Rogan, E, Louis, M & Foote, AD 2019, 'Postglacial Colonization of Northern Coastal Habitat by Bottlenose Dolphins: a Marine Leading-Edge Expansion?', The Journal of Heredity, vol. 110, no. 6, pp. 662-674. https://doi.org/10.1093/jhered/esz039

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title = "Postglacial Colonization of Northern Coastal Habitat by Bottlenose Dolphins: a Marine Leading-Edge Expansion?",

abstract = "Oscillations in the Earth's temperature and the subsequent retreating and advancing of ice-sheets around the polar regions are thought to have played an important role in shaping the distribution and genetic structuring of contemporary high-latitude populations. After the Last Glacial Maximum (LGM), retreating of the ice-sheets would have enabled early colonizers to rapidly occupy suitable niches to the exclusion of other conspecifics, thereby reducing genetic diversity at the leading-edge. Bottlenose dolphins (genus Tursiops) form distinct coastal and pelagic ecotypes, with finer-scale genetic structuring observed within each ecotype. We reconstruct the postglacial colonization of the Northeast Atlantic (NEA) by bottlenose dolphins using habitat modeling and phylogenetics. The AquaMaps model hindcasted suitable habitat for the LGM in the Atlantic lower latitude waters and parts of the Mediterranean Sea. The time-calibrated phylogeny, constructed with 86 complete mitochondrial genomes including 30 generated for this study and created using a multispecies coalescent model, suggests that the expansion to the available coastal habitat in the NEA happened via founder events starting ~15 000 years ago (95% highest posterior density interval: 4 900-26 400). The founders of the 2 distinct coastal NEA populations comprised as few as 2 maternal lineages that originated from the pelagic population. The low effective population size and genetic diversity estimated for the shared ancestral coastal population subsequent to divergence from the pelagic source population are consistent with leading-edge expansion. These findings highlight the legacy of the Late Pleistocene glacial cycles on the genetic structuring and diversity of contemporary populations.",

author = "Milaja Nyk{\"a}nen and Kristin Kaschner and Willy Dabin and Andrew Brownlow and Davison, {Nicholas J} and Rob Deaville and Cristina Garilao and Kathleen Kesner-Reyes and Gilbert, {M Thomas P} and Rod Penrose and Valentina Islas-Villanueva and Nathan Wales and Ingram, {Simon N.} and Emer Rogan and Marie Louis and Foote, {Andrew D.}",

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AU - Nykänen, Milaja

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AU - Dabin, Willy

AU - Brownlow, Andrew

AU - Davison, Nicholas J

AU - Deaville, Rob

AU - Garilao, Cristina

AU - Kesner-Reyes, Kathleen

AU - Gilbert, M Thomas P

AU - Penrose, Rod

AU - Islas-Villanueva, Valentina

AU - Wales, Nathan

AU - Ingram, Simon N.

AU - Rogan, Emer

AU - Louis, Marie

AU - Foote, Andrew D.

PY - 2019/9/1

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N2 - Oscillations in the Earth's temperature and the subsequent retreating and advancing of ice-sheets around the polar regions are thought to have played an important role in shaping the distribution and genetic structuring of contemporary high-latitude populations. After the Last Glacial Maximum (LGM), retreating of the ice-sheets would have enabled early colonizers to rapidly occupy suitable niches to the exclusion of other conspecifics, thereby reducing genetic diversity at the leading-edge. Bottlenose dolphins (genus Tursiops) form distinct coastal and pelagic ecotypes, with finer-scale genetic structuring observed within each ecotype. We reconstruct the postglacial colonization of the Northeast Atlantic (NEA) by bottlenose dolphins using habitat modeling and phylogenetics. The AquaMaps model hindcasted suitable habitat for the LGM in the Atlantic lower latitude waters and parts of the Mediterranean Sea. The time-calibrated phylogeny, constructed with 86 complete mitochondrial genomes including 30 generated for this study and created using a multispecies coalescent model, suggests that the expansion to the available coastal habitat in the NEA happened via founder events starting ~15 000 years ago (95% highest posterior density interval: 4 900-26 400). The founders of the 2 distinct coastal NEA populations comprised as few as 2 maternal lineages that originated from the pelagic population. The low effective population size and genetic diversity estimated for the shared ancestral coastal population subsequent to divergence from the pelagic source population are consistent with leading-edge expansion. These findings highlight the legacy of the Late Pleistocene glacial cycles on the genetic structuring and diversity of contemporary populations.

AB - Oscillations in the Earth's temperature and the subsequent retreating and advancing of ice-sheets around the polar regions are thought to have played an important role in shaping the distribution and genetic structuring of contemporary high-latitude populations. After the Last Glacial Maximum (LGM), retreating of the ice-sheets would have enabled early colonizers to rapidly occupy suitable niches to the exclusion of other conspecifics, thereby reducing genetic diversity at the leading-edge. Bottlenose dolphins (genus Tursiops) form distinct coastal and pelagic ecotypes, with finer-scale genetic structuring observed within each ecotype. We reconstruct the postglacial colonization of the Northeast Atlantic (NEA) by bottlenose dolphins using habitat modeling and phylogenetics. The AquaMaps model hindcasted suitable habitat for the LGM in the Atlantic lower latitude waters and parts of the Mediterranean Sea. The time-calibrated phylogeny, constructed with 86 complete mitochondrial genomes including 30 generated for this study and created using a multispecies coalescent model, suggests that the expansion to the available coastal habitat in the NEA happened via founder events starting ~15 000 years ago (95% highest posterior density interval: 4 900-26 400). The founders of the 2 distinct coastal NEA populations comprised as few as 2 maternal lineages that originated from the pelagic population. The low effective population size and genetic diversity estimated for the shared ancestral coastal population subsequent to divergence from the pelagic source population are consistent with leading-edge expansion. These findings highlight the legacy of the Late Pleistocene glacial cycles on the genetic structuring and diversity of contemporary populations.

U2 - 10.1093/jhered/esz039

DO - 10.1093/jhered/esz039

M3 - Journal article

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SN - 0022-1503

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EP - 674

JO - Journal of Heredity

JF - Journal of Heredity

IS - 6

ER -

Postglacial Colonization of Northern Coastal Habitat by Bottlenose Dolphins: a Marine Leading-Edge Expansion?

Abstract

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