Habitat availability and geographic isolation as potential drivers of population structure in an oceanic dolphin in the Southwest Indian Ocean

Viricel Amelia; Simon-Bouhet Benoit; Ceyrac Laura; Dulau-Drouot Violaine; Berggren Per; Amir Omar A.; Jiddawi Narriman S.; Mongin Philippe; Kiszka Jeremy J.

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Habitat availability and geographic isolation as potential drivers of population structure in an oceanic dolphin in the Southwest Indian Ocean

机译：栖息地的可用性和地理隔离是西南印度洋海洋海豚种群结构的潜在驱动因素

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Delphinid populations show highly variable patterns of genetic diversity and population structure. Previous studies indicate that habitat discontinuities and geographic isolation are major drivers of population division in cetaceans. Spinner dolphins (Stenella longirostris) are distributed in all tropical oceans, but they are particularly common around islands and atolls. This species occurs in shallow waters at daytime to rest and socialise, and feeds on offshore mesopelagic prey overnight. Here, we investigated the genetic population structure of spinner dolphins in the Southwest Indian Ocean along a west-east geographic gradient, from eastern Africa to the Mascarene archipelago. We combined analyses of 12 microsatellite loci, mtDNA control region sequences, and sighting data to assess genetic differentiation and characterise habitat preferences of these populations. Significant genetic structure among the three sampled sites (Zanzibar, Mayotte and La Reunion) was observed using both types of molecular markers. Overall, our results indicate that geographic isolation and potentially other factors, such as shallow-water habitats to rest and socialise, may be important drivers of the genetic population structure of insular spinner dolphins in this region.

机译：Delphinid种群显示出遗传多样性和种群结构高度可变的模式。先前的研究表明，栖息地的不连续性和地理隔离是鲸类种群划分的主要驱动力。旋转海豚（Stenella longirostris）分布在所有热带海洋中，但在岛屿和环礁周围尤为常见。该物种白天出现在浅水区中休息和交往，并以近海捕食近中生猎物为食。在这里，我们调查了西南印度洋沿旋转的海豚的遗传种群结构，该种群沿从东非到马斯卡林群岛的东西向地理梯度分布。我们结合了对12个微卫星基因座，mtDNA控制区序列和观测数据的分析，以评估遗传分化并描述这些种群的生境偏好。使用这两种类型的分子标记都观察到三个取样位点（桑给巴尔，马约特岛和留尼汪岛）中的重要遗传结构。总体而言，我们的结果表明，地理隔离和潜在的其他因素，例如休息和社交的浅水生境，可能是该地区岛状旋转海豚遗传种群结构的重要驱动力。

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来源
《Marine biology》 |2016年第10期|218.1-218.12|共12页
作者
Viricel Amelia; Simon-Bouhet Benoit; Ceyrac Laura; Dulau-Drouot Violaine; Berggren Per; Amir Omar A.; Jiddawi Narriman S.; Mongin Philippe; Kiszka Jeremy J.;
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Univ la Rochelle, CNRS, Inst Littoral & Environm, LIttoral Environm & Soc LIENSs,UMR 7266, 2 Rue Olympe Gouges, F-17000 La Rochelle, France;

Univ la Rochelle, CNRS, Inst Littoral & Environm, LIttoral Environm & Soc LIENSs,UMR 7266, 2 Rue Olympe Gouges, F-17000 La Rochelle, France|Univ la Rochelle, CEBC, CNRS, Inst Littoral & Environm,UMR 7372, 2 Rue Olympe Gouges, F-17000 La Rochelle, France;

Ctr Rech Halieut Mediterraneenne & Trop, UMR MARBEC MARine Biodivers Exploitat & Conservat, IRD, BP 171, F-34203 Sete, France;

Globice Reunion, 30 Chemin Parc Cabris, Grand Bois 97410, St Pierre, Reunion;

Newcastle Univ, Sch Marine Sci & Technol, Newcastle Upon Tyne NE1 7RU, Tyne & Wear, England;

Minist Livestock & Fisheries, POB 295,Nyangumi House,Maruhubi St, Zanzibar, Tanzania;

Inst Marine Sci, POB 668, Zanzibar, Tanzania;

Brigade Nat Ocean Indien, Parc Providence, St Denis 97400, Reunion;

Univ la Rochelle, CNRS, Inst Littoral & Environm, LIttoral Environm & Soc LIENSs,UMR 7266, 2 Rue Olympe Gouges, F-17000 La Rochelle, France|Ctr Rech Halieut Mediterraneenne & Trop, UMR MARBEC MARine Biodivers Exploitat & Conservat, IRD, BP 171, F-34203 Sete, France|Florida Int Univ, Dept Biol Sci, 3000 NE 151st St, North Miami, FL 33181 USA;

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6. Molecular ecology meets remote sensing: environmental drivers to population structure of humpback dolphins in the Western Indian Ocean [O] . M Mendez, A Subramaniam, T Collins, 2011

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7. Habitat availability and geographic isolation as potential drivers of population structure in an oceanic dolphin in the Southwest Indian Ocean [O] . Viricel, Amélia, Simon-Bouhet, Benoit, Ceyrac, Laura, 2016

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8. Summary of Distribution Records of the Spinner Dolphin, 'Stenella longirostris, and the Pantropical Spotted Dolphin, 'S. attenuata', from the Western Pacific Ocean, Indian Ocean and Red Sea [R] . Gilpatrick, J. W. , Perrin, W. F. , Leatherwood, S. , 1987

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Habitat availability and geographic isolation as potential drivers of population structure in an oceanic dolphin in the Southwest Indian Ocean

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