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Current Status of the Sardinian Partridge

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Current Status of the Sardinian Partridge Current status of the Sardinian partridge () assessed by molecular markers Massimo Scandura, Laura Iacolina, Marco Apollonio, Francesco Dessì-Fulgheri, Mariella Baratti To cite this version: Massimo Scandura, Laura Iacolina, Marco Apollonio, Francesco Dessì-Fulgheri, Mariella Baratti. Cur- rent status of the Sardinian partridge () assessed by molecular markers. European Journal of Wildlife Research, Springer Verlag, 2009, 56 (1), pp.33-42. 10.1007/s10344-009-0286-z. hal-00535231 HAL Id: hal-00535231 https://hal.archives-ouvertes.fr/hal-00535231 Submitted on 11 Nov 2010 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. Eur J Wildl Res (2010) 56:33–42 DOI 10.1007/s10344-009-0286-z ORIGINAL PAPER Current status of the Sardinian partridge (Alectoris barbara) assessed by molecular markers Massimo Scandura & Laura Iacolina & Marco Apollonio & Francesco Dessì-Fulgheri & Mariella Baratti Received: 25 June 2008 /Revised: 17 April 2009 /Accepted: 21 May 2009 /Published online: 11 June 2009 # Springer-Verlag 2009 Abstract Four Alectoris species inhabit the Mediterranean (Gallus gallus) microsatellites. A low level of genetic area, where they represent important gamebirds subject to variation was observed in the Sardinian population human manipulations. The Sardinian partridge is peculiar in (HE=0.310; kAR=2.69), comparable only to that observed Europe, in that it belongs to the African species Alectoris in the Sicilian rock partridge (A. graeca). The comparison barbara. Nevertheless, no comprehensive study has as yet with the Tunisian population showed that its present genetic investigated its genetic status as regards both the extant composition is consistent with a historical introduction levels of genetic diversity and the possible contamination from North Africa, showing possible effects of a post- due to introgressive hybridization with other Mediterranean introductional genetic drift. Bayesian tests assigned all but species. For the purposes of this study, we analyzed 65 one individuals with >90% probability to A. barbara, thus, samples of Sardinian partridges, 40 of which came from the providing evidence that no or only a few exotic Alectoris wild population and 25 from captive stocks. No one of genes have introgressed into Sardinian partridges. them showed a mtDNA polymerase chain reaction restric- tion fragment length polymorphism haplotype assigned to Keywords Sardinia . Barbary partridge . Genetic another species than A. barbara, thus, ruling out a possible variability. Introgressive hybridization . Microsatellites introgression in the maternal line. In addition, we compared these samples with 94 partridges from other circum- Mediterranean populations using a set of eight chicken Introduction Island populations are a major concern in conservation Communicated by E. Hadjisterkotis genetics. This is because of the important genetic implica- M. Scandura (*) : L. Iacolina : M. Apollonio tions (e.g., genetic drift, bottlenecks, inbreeding) that can Department of Zoology and Evolutionary Genetics, affect the status of a long-term isolated population. Founder University of Sassari, effect and genetic drift, associated with low levels of gene via Muroni 25, flow to and from other populations, can cause a remarkable 07100 Sassari, Italy ′ e-mail: [email protected] loss of genetic diversity, compromising the species adaptability and finally increasing its extinction risk F. Dessì-Fulgheri (Allendorf and Luikart 2007). In addition, introgressive Department of Animal Biology and Genetics, hybridization of the local fauna with translocated nonin- University of Florence, Via Romana 17, digenous animals can account for the disruption of locally 50125 Florence, Italy adapted gene pools, finally causing the genetic extinction of a species or a population (Rhymer and Simberloff 1996; M. Baratti Allendorf et al. 2001). Institute for the Study of Ecosystems, CNR, Via Madonna del Piano 10, The terrestrial fauna of most Mediterranean islands has 50019 Sesto Fiorentino, Florence, Italy radically changed since the Early Holocene. Native species 34 Eur J Wildl Res (2010) 56:33–42 (especially mammals) have, in many cases, been replaced found to be a rule in many restocked partridge populations by allochthonous fauna, often as a result of human- across Europe (Negro et al. 2001; Baratti et al. 2005; mediated introductions, either deliberate or unintentional Barilani et al. 2007a, b; Martínez-Fresno et al. 2008). (Blondel and Vigne 1993). However, these introductions Noticeably, due to the biogeographical distribution pattern occurred at different prehistorical and historical time points of Alectoris partridges in the Mediterranean basin, conti- and, to some extent, were followed by local adaptation via nental stocks introduced to Sardinia for hunting purposes genetic differentiation of introduced stocks from their would quite likely belong to a different species. Therefore, source populations. concern has arisen on the risk of introgression of exotic Birds belonging to the genus Alectoris are a good genes into the Sardinian population. example of game fauna largely managed by humans and In the present study, we combined polymerase chain intentionally introduced on many Mediterranean islands reaction restriction fragment length polymorphism (PCR- (Johnsgard 1988). In the Mediterranean basin, this genus RFLP) and microsatellite analyses with the aim to assess numbers four species with a basically allopatric distribu- the genetic status of the Sardinian partridge population. tion, namely: (1) the barbary partridge Alectoris barbara in Multilocus genotyping techniques have already shown to North Africa, (2) the red-legged partridge A. rufa in be useful tools for assessing levels of genetic variation and Southwestern Europe from Portugal to Italy, (3) the rock population structure (Randi et al. 2003; Tejedor et al. partridge A. graeca in Southeastern Europe from the 2005;Chenetal.2006;Arrugaetal.2007), as well as Balkans to Italy, and (4) the chukar partridge A. chukar in resolving interspecific hybridization processes in Alectoris Eastern Asia (Cramp and Simmons 1980). taxa (Baratti et al. 2005; Barilani et al. 2007a, b;Tejedor Of the four Mediterranean partridges, the barbary et al. 2007). The microsatellite markers used in these partridge is the oldest and the most phylogenetically studies had been isolated in the chicken (Gallus gallus) divergent taxon (Randi 1996; Randi et al. 1998; Kimball and revealed to be polymorphic in species of the genus et al. 1999). Its speciation is supposed to have occurred at Alectoris (Baratti et al. 2005), as well as in other the Miocene–Pliocene boundary, when the closure of the Galliformes (Baratti et al. 2001). Mediterranean Sea favored the spread of birds adapted to Goals of our study were: (1) to evaluate levels of genetic arid and steppe habitats (Randi et al. 1992). Nowadays, the variation within the Sardinian stock; (2) to assess the extent only non-African regions where this species occurs are the of genetic differentiation between the Sardinian population Gibraltar peninsula, Sardinia, and the Canary islands and North African barbary partridges, (3) to check for (Cramp and Simmons 1980). Regarding the origin of the possible signs of introgressive hybridization with other Sardinian population, two hypotheses were formulated in continental Alectoris species. the past: one proposes that partridges have been introduced by humans at some time during the last 3,000 years (Mocci Demartis 1992), while, according to the other, partridges Materials and methods reached the island by active dispersal from North Africa during the Upper Miocene (Spanò 1975). Palaeontological Sample collection and DNA isolation and zooarcheological records seem to support the former hypothesis and date the introduction at 3,000–2,000 years Sixty-five muscle or feather samples were collected in ago (B. Wilkens, pers. comm.). Sardinia from free-living barbary partridges (n=40) and Despite its relevancy to the management of the Sardinian from four different captive breeding stocks (Bonassai, n=6; population, no genetic investigation has so far been Abbasanta, n=7; Tertenia, n=2; Uta, n=10). Sardinian performed to determine its degree of genetic differentiation samples are cumulatively coded as AbSar and their location from North African populations. In addition, the growing is shown in Fig. 1. interest in rearing captive stocks of this species to satisfy For purposes of comparison, reference samples (blood, hunters requests, prompts an evaluation of the genetic muscle, or feathers) were collected from wild Alectoris integrity of the Sardinian partridge population, in particular populations across the Mediterranean basin (Fig. 1): bar- with respect to the possibility of past hybridizations with bary partridges A. barbara from Tunisia (AbTun, n=10), other Alectoris taxa. In fact, interspecific hybridization rock partridges A. graeca from Sicily (AgSic, n=10), within this genus is possible (Watson 1962a, b)and Central Apennines (AgApe, n=20), and Eastern
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