Comparative phylogeography of two African carnivorans presumably introduced into Europe: disentangling natural versus human-mediated dispersal across the Strait of Gibraltar

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Abstract:

Abstract Aim 

Natural processes of colonization and human-mediated introductions have shaped current patterns of biodiversity in the Mediterranean Basin. We use a comparative phylogeographic approach to investigate the genetic structure of Herpestes ichneumon and Genetta genetta (Carnivora) across the Strait of Gibraltar, and test for their supposedly contemporaneous introduction into Iberia. Location 

Mediterranean Basin and Africa. Methods 

We sequenced two mitochondrial fragments (cytochrome b and control region) of 91 (H. ichneumon) and 185 (G. genetta) individuals, including the sole archaeological record of G. genetta in Iberia, dating from the Muslim occupation. We used phylogenetic and tokogenetic methods, summary statistics, neutrality tests, geographic–genetic pairwise comparisons and coalescent estimates to explore the history of the two species in the Mediterranean Basin. Results 

In North Africa, an autochthonous (Clade I) and a western African mtDNA clade, coalescing in the Middle to Late Pleistocene, co-occurred in both species. Only Clade I was present in Europe. In H. ichneumon, the European pool showed deep coalescence (median = 335 kyr) and high genetic differentiation and diversity compared with its North African counterpart, suggesting long-term stability of female effective population size. In sharp contrast, G. genetta in Europe exhibited lower genetic diversity, weak differentiation with North Africa and recent demographic expansion; however, Andalusia and Catalonia (Spain) showed distinctly higher genetic diversity, and the archaeological specimen had the predominant European haplotype. Main conclusions 

The co-occurrence of autochthonous and sub-Saharan lineages in North Africa (1) supports a new, emerging biogeographic scenario in North Africa, and (2) suggests a connection through the Sahara, possibly from the Middle Pleistocene onwards. Our results refute the idea that H. ichneumon was introduced into Europe contemporaneously with G. genetta. Instead, they support a scenario of sweepstake dispersal during Late Pleistocene sea-level fluctuations, followed by long-term in situ evolution throughout the last glaciation cycles. Genetta genetta appears to have undergone a recent spread from at least two independent introduction ‘hotspots’ in Catalonia and Andalusia, possibly following antique trade routes and/or Muslim invasions. Despite their contrasting histories, the European gene pools of both species represent unusual cases leading to the preservation of autochthonous, North African lineages.

Keywords: Ancient DNA; Genetta genetta; Herpestes ichneumon; Mediterranean Basin; North Africa; coalescence; comparative phylogeography; introduction; mitochondrial DNA; transmarine dispersal

Document Type: Research Article

DOI: http://dx.doi.org/10.1111/j.1365-2699.2010.02406.x

Affiliations: 1: Museo Nacional de Ciencias Naturales (CSIC), José Gutiérrez Abascal 2, 28006 Madrid, Spain 2: Universidad Autónoma de Madrid, Departamento de Biologia, Laboratorio de Arqueozoología, Campus de Cantoblanco, calle Darwin 2, E-28049 Madrid, Spain 3: Estación Biológica de Doñana (CSIC), Departamento de Biología de la Conservación, c/Américo Vespucio s/n, Isla de la Cartuja, 41092 Seville, Spain 4: Muséum National d’Histoire Naturelle, Département Systématique et Evolution, UMR CNRS 7205 OSEB, 57 rue Cuvier – CP 51, Paris, France 5: Departamento de Biologia, Universidade de Aveiro, CESAM, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal 6: Department of Zoology, Faculty of Science, Al-Azhar University, Nasr City, Cairo, Egypt 7: Université d’Abomey-Calavi, Faculté des Sciences Agronomiques, Laboratoire d’Ecologie Appliquée, 01 BP 526 Cotonou, Benin 8: Zoology and Entomology Department, University of Fort Hare, Private Bag X1314, 5700 Alice, South Africa 9: Department of Zoology, Tel Aviv University, Tel Aviv 69978, Israel 10: Ahi Evran University, Education Faculty, 40100 Kırşehir, Turkey 11: Genoscope, Centre National de Séquençage, 2 rue Gaston Crémieux, CP 5706, 91057 Evry Cedex, France

Publication date: February 1, 2011

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