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. 2011 Jul 27:4:151.
doi: 10.1186/1756-3305-4-151.

Temporal stability in the genetic structure of Sarcoptes scabiei under the host-taxon law: empirical evidences from wildlife-derived Sarcoptes mite in Asturias, Spain

Samer Alasaad  1 , Álvaro Oleaga, Rosa Casais, Luca Rossi, Annarita Molinar Min, Ramón C Soriguer, Christian Gortázar
Affiliations

Temporal stability in the genetic structure of Sarcoptes scabiei under the host-taxon law: empirical evidences from wildlife-derived Sarcoptes mite in Asturias, Spain

Samer Alasaad et al. Parasit Vectors. .

Abstract

Background: Implicitly, parasite molecular studies assume temporal genetic stability. In this study we tested, for the first time to our knowledge, the extent of changes in genetic diversity and structure of Sarcoptes mite populations from Pyrenean chamois (Rupicapra pyrenaica) in Asturias (Spain), using one multiplex of 9 microsatellite markers and Sarcoptes samples from sympatric Pyrenean chamois, red deer (Cervus elaphus), roe deer (Capreolus capreolus) and red fox (Vulpes vulpes).

Results: The analysis of an 11-years interval period found little change in the genetic diversity (allelic diversity, and observed and expected heterozygosity). The temporal stability in the genetic diversity was confirmed by population structure analysis, which was not significantly variable over time. Population structure analysis revealed temporal stability in the genetic diversity of Sarcoptes mite under the host-taxon law (herbivore derived- and carnivore derived-Sarcoptes mite) among the sympatric wild animals from Asturias.

Conclusions: The confirmation of parasite temporal genetic stability is of vital interest to allow generalizations to be made, which have further implications regarding the genetic structure, epidemiology and monitoring protocols of the ubiquitous Sarcoptes mite. This could eventually be applied to other parasite species.

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Figures

Figure 1
Figure 1
Results of STRUCTURE analysis showing Δ K as proposed by Evanno et al. [27]method. The best fit of the data was two clusters.
Figure 2
Figure 2
Bar plotting of the proportion of individual variation of 60 Sarcoptes mite from different host species in Asturias (Spain) collected with 11-years interval, assigned to a given genetic clusters in STRUCTURE, when two (A: K = 2), three (B: K = 3), four (C: K = 4), five (D: K = 5), and six (E: K = 6) populations are assumed in the dataset. Each cluster is represented by a different colour. 1: R. pyrenaica-1997. 2: R. pyrenaica-2008. 3. C. capreolus-2008. 4: C. elaphus-2008. 5: V. vulpes-2008.
Figure 3
Figure 3
Factorial Component Analysis (FCA) of the proportion of variation of five Sarcoptes mite populations from Asturias (Spain) assigned to a given genetic clusters in Genetix.
See this image and copyright information in PMC

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