Isolation and characterization of eight polymorphic microsatellite markers from the orange-fin anemonefish, Amphiprion chrysopterus
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Eight polymorphic microsatellite loci were isolated and characterized from the orange-fin anemonefish (Amphiprion chrysopterus). These loci provided markers with polymorphisms of 4–14 alleles per locus within 151 individuals from Moorea, French Polynesia. The expected heterozygosities ranged from 0.53 to 0.88. High variability suggests that these markers should be useful to study paternity, population structure, and connectivity in this species.
KeywordsAmphiprion chrysopterus Orange-fin anemonefish Microsatellite
A common strategy to promote sustainability and conserve biodiversity on marine reefs involves the design and creation of spatially defined protected areas (Cowen et al. 2007). Crucial for the implementation of this and other management actions is the accurate knowledge of dispersal, self-recruitment, and connectivity among populations (Hauser and Carvalho 2008). Anemonefishes in the genus Amphiprion have been used as model species for such studies.
The largest species of Amphiprion, the orange-fin anemonefish A. chrysopterus, occurs in the central and western Pacific from French Polynesia to Micronesia, Papua New Guinea and the Philippines (Fautin and Allen 1997). As with most other anemonefish, reef-associated life stages of A. chrysopterus live on anemones from the moment larvae settle from the plankton (Fautin and Allen 1997). The ease with which various developmental stages can be sampled has enabled the use of anemonefishes in studies of dispersal and self-recruitment (e.g. Jones et al. 2005). Orange-fin anemonefish have been used in explorations of population and community dynamics (e.g., Schmitt and Holbrook 2003; Holbrook and Schmitt 2004), although issues related to connectivity and self-recruitment in this otherwise well studied species have not been resolved. The main goal of this study was to develop and characterize microsatellite markers from Amphiprion chrysopterus, to enable future behavioral and population genetic studies.
Total DNA was extracted using a DNeasy blood and tissue kit (QIAGEN) from approximately 20 mg of caudal fin. Genomic DNA (100 μg) was used by GIS (Genetic Identification Services, Chatsworth, California) to identify microsatellite loci. Genomic libraries were enriched for CA, CATC, TACA, TAGA repeat motifs. We tested 18 microsatellites for polymorphism. Amplification reactions were carried out using a fluorescently blue labeled forward primer and an unlabeled reverse primer in an Applied Biosystems GeneAmp PCR 9700 system in a total volume of 13 μl containing 11 μl of 1.1 PCR Mastermix (25 mM TAPS pH 9.5, 50 mM KCl, 2 mM MgCl2, 200 μM each dNTP, Taq 5 u/μl, Thermo Scientific), 0.2 μM primers and approximately 2 ng of DNA template. The following temperature profile was used: 3 min at 94°C, followed by 35 cycles of 30 s at 94°C for 40 s, 55–58°C for 40 s, 72°C for 40 s and a final extension of 72°C for 4 min. Each microsatellite amplification was diluted with nH2O (1:20), mixed with Applied Biosystems GeneScan 500 ROX and size standard, run on an ABI 3100 automated sequencer, and scored using the software GENEMAPPER version 3.7 (Applied Biosystems). We scanned our data for null alleles using MICROCHECKER (van Oosterhout et al. 2006), for each locus, calculated expected and observed heterozygosities, deviations from Hardy–Weinberg (HW) equilibrium and presence or absence of linkage disequilibrium using ARLEQUIN version 3.11 (Excoffier et al. 2005).
Characterization of eight polymorphic microsatellite loci for the orange-fin anemonefish, Amphiprion chrysopterus for 151 specimens
Primer sequence (5′ to 3′)
This research was supported by grant OCE 04-17412 from the National Science Foundation and an award from the Gordon and Betty Moore Foundation. R. Beldade also was funded by FCT (SFRH/BPD/26901/2006). This is a contribution of the Moorea Coral Reef (MCR) Long Term Ecological Research (LTER) site, and is contribution number 179 of the UC Berkeley Gump Research Station.
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