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Research Article
 

Genetic Variation of Limnonectes blythii (Anura: Dicroglossidae) Using RAPD (Random Amplified Polymorphic DNA) Analysis in West Sumatra



Wince Hendri, Djong Hon Tjong, Dahelmi and Dewi Imelda Roesma
 
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ABSTRACT

Background and Objective: Limnonectes blythii population in west Sumatra sharply decline because of its trading activity and damaged habitat. Conservation effort is necessary to protect the species. One of important information that needs to be done is to understand the species genetic variation. The aim of this study was to analyze the genetic variety of Limnonectes blythii of west Sumatra using Random Amplified Polymorphic DNA (RAPD). Materials and Methods: Thirty frogs were collected from three location of wildlife sanctuary in west Sumatra. Genetic variation analysis using RAPD with 11 OPA primer. The electrophoresis results were marked as 1 if a band founded and 0 if there’s no band. Results: Genetic variation of three population were low and the highest founded on Malampah population , next on Sijunjung and lastly Harau . However, genetic differentiation inter-population was considered moderate, which of half of overall genetic variation generated from differentiation inter-population and also a half from differentiation of intra-population which supported by lower heterozygosity inter-population than intra-population heterozygosity. Gen flow value of inter-population was observed moderate. Conclusion: Genetic variation of L. blythii intra-population is lower than inter-population and the gene flow between L. blythii population considered moderate.

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  How to cite this article:

Wince Hendri, Djong Hon Tjong, Dahelmi and Dewi Imelda Roesma, 2019. Genetic Variation of Limnonectes blythii (Anura: Dicroglossidae) Using RAPD (Random Amplified Polymorphic DNA) Analysis in West Sumatra. International Journal of Zoological Research, 15: 1-5.

DOI: 10.3923/ijzr.2019.1.5

URL: https://scialert.net/abstract/?doi=ijzr.2019.1.5
 

INTRODUCTION

Bobo frog, Limnonectes blythii is one of widely spread species in southeast Asian, from Myanmar, Thailand, Peninsular Malaysia and northern Sumatra1-4. In west Sumatra, this frog population decline because of over harvest by local community for export commodity and their damaged habitat5.

This species status by IUCN6 is almost threatened. Some effort needed to conserve this species. However, there was some difficulties because no information provided for genetic variation of this species.

Research related to biology of L. blyhhii west Sumatra is still a few in number. One of the information of is biology, that is crucial for conservation is genetic variation. Genetic variation information of species are important to understand because the higher variation leads to the higher chances of a species ability to adapt in their environment7. The RAPD (Random Amplified Polymorphic DNA) can be used to analyze the genetic variation of frog8,9.

This research aimed to evaluate the genetic variation of L. blyrhii in west Sumatra using RAPD. The information obtained could be used to construct a future conservation plan for this frog species.

MATERIALS AND METHODS

Frogs collection locality: Thirty samples were collected from three location of wildlife sanctuary in west Sumatra i.e., Lembah Harau-Payakumbuh (Harau), Malampah-Pasaman Barat (Malampah) and Pangean II-Sijunjung (Pangean) and samples stored at Zoology Museum of Andalas University (Table 1, Fig. 1).

Table 1: Research sampling area of Limnonectes blythii
Image for - Genetic Variation of Limnonectes blythii (Anura: Dicroglossidae) Using RAPD (Random Amplified Polymorphic DNA) Analysis in West Sumatra

Image for - Genetic Variation of Limnonectes blythii (Anura: Dicroglossidae) Using RAPD (Random Amplified Polymorphic DNA) Analysis in West Sumatra
Fig. 1: Sampling location of Limnonectes blythii

DNA isolation dan DNA primer: The DNA isolations were done using kit protocol of Roche, Blood and tissue Kit Roche. Eleven RAPD primer used were from Operon Technologies Inc., Alameda, USA, i.e., OPA-01, OPA-02, OPA-03, OPA-04, OPA-05, OPA-06, OPA-07, OPA-09, OPA-11, OPA-12 and OPA-13.

PCR amplification: Kit GoTaq Green 12,5 μL+9,5 μL ddH2O+2 μL DNA sample+1 μL primer used for DNA amplification. PCR cycle steps used were pre-denaturation at 94°C for 2 min, denaturation at 94°C for a minute, annealing at 35°C for a minute and elongation at 72°C for 2,5 min and repeated for 45 cycle10. The PCR results analysis then continued with gel electrophoresis using agarose 2% and colored with EtBr.

Data analysis: Bands of gel electrophoresis were analyzed by scoring based on the presence of DNA bands. Samples with DNA bands were mark as 1 and with no band founded mark as 0. After that, the data analyzed using POPGENE version11 1.31, including population genetic variation (Percentage of polymorphic locus (P), heterozygosity (H), Shannon diversity (I)) and genetic variation inter-population (population heterozygosity (HS), heterozygosity intra-population (DST), heterozygosity total (HT), genetic differentiation (GST) and gen flow (Nm).

RESULTS

Ninety five bands with size of 200-2.642 bp were founded, which consist of 82 polymorphic bands (85.77%) and 13 DNA monomorphic bands (14.23%) (Fig. 2).

The highest number of bands were founded from Malampah population (66 bands) and the lowest from Pangean population (42 bands). DNA bands resulted from each primers varies from 8-16 DNA bands and approximately 11.88 bands per primer. The highest numbers of polymorphic locus and percentage were found at Malampah population with 47 locus and 49.47% and Harau and Pangean population with 30 locus and 31.58% (Table 2).

Table 2 showed that highest number of heterozygosity found at Malampah population (H = 0.1602±0.020) followed by Pangean (H = 0.1274±0.020) and the lowest was Harau (H = 0.1263±0.019). Average Index Shannon (I) Harau population (I = 0.184±0.028), Pangean (I = 0.185±0.028) and Harau (0.184±0.028).

Limnonectes blythii of west Sumatra Barat had lower population heterozygosity (HS = 0.138) than heterozygosity inter-population (DST =0.143), therefore the total population heterozygosity (HT = 0.281). This results showed that genetic variety of L. blythii intra-population was smaller than inter-population. Inter-population genetic differentiation of L. blythii (GST = 0.5091) was considered moderate and gen flow was NM (0.4821).

Image for - Genetic Variation of Limnonectes blythii (Anura: Dicroglossidae) Using RAPD (Random Amplified Polymorphic DNA) Analysis in West Sumatra
Fig. 2: DNA bands profile as the result of amplification using primer OPA-01 L. blythii on agarose gel 1.2%. M: Marker of 100 bp, 1-10: Pangean population, 11-20: Harau population and 21-30: Malampah population

Table 2: Genetic variation of L. blythii on west Sumatra
Image for - Genetic Variation of Limnonectes blythii (Anura: Dicroglossidae) Using RAPD (Random Amplified Polymorphic DNA) Analysis in West Sumatra

Table 3: Genetic differentiation and gene flow of L. blythii on west Sumatra
Image for - Genetic Variation of Limnonectes blythii (Anura: Dicroglossidae) Using RAPD (Random Amplified Polymorphic DNA) Analysis in West Sumatra

Genetic differentiation showed that 50.91% of total genetic variation was inter-population and 49.09% from intra-population as shown in Table 3.

DISCUSSION

Wildlife Sanctuary of Lembah Harau-Payakumbuh (Harau), Malampah-Pasaman Barat (Malampah) and Pangean II-Sijunjung (Pangean) are conservation area protected by Indonesian government. Outside sanctuary, Limnonectes blythii were rarely found. Higher genetic variety in Malampah population was most likely influenced by undisturbed river condition of this species habitat from human activities compared with Harau and Pangean. This species habitat in Harau was already disturbed by human activities for tourist attraction which lead to changes in vegetation and habitat destruction because of land fragmentation and pollution. Likewise with Pangean area, the river of L. blythii habitat is close with community settlement which caused pollution and habitat fragmentation. Limnonectes blythii used to live and reproduce at shallow and clear river flow in tropical forest12. Genetic variation of Hylarana parvicola on Malampah was higher than Pangean and Harau because both of the species habitat on already fragmented and polluted13. Anthropogenic factor greatly influence organism’s habitat quality, including amphibians14.

Genetic variation on the three population were considered low with average heterozygosity between 0,160-0,126. One of the reason behind this low genetic variety is intensive capture since 1970’s until 2000’s for trade and export goods. This condition leads to low possibility to find this species population outside conservation area. Small population would increase inbreeding and non-random mating thus decreasing genetic variation7. Small population also lower genetic mixing among individual in population that bring down genetic variation and fitness of that population15. The low genetic variation of L. blythii in north Thailand caused by captures for export16. Limnonectes blythii as one of the biggest frog species in the world and able to reach 90-260 mm. The great size made this species often captured intensively and exported by local people for its legs for consumption5.

Genetic differentiation (GST) and gen flow (NM) on all population in this research were considered moderate GST (0.5091) and NM (0.4821). This result showed that genetic variation intra-population was lower than inter-population. Moderate inter-population genetic differentiation correlated with how this species living. The three population of this species live on different river habitat, which eliminate possibility to cross mating between populations. Higher probability of inbreeding inside population, lowering genetic variation and lead to moderate gen flow of three L. blythii populations. The number of gen flow shows the level of migration and dispersal between populations6. The that lower genetic differentiation and gen flow of H. parvacola population of west Sumatra caused by changes of vegetation types and microhabitat of their each population13.

Low genetic variation of three population observed from RAPD analysis implied that future sustainability of this species would be endangered. However, moderate genetic differentiation of L. blythii inter-population bring through the possibility to construct a conservation strategy. Another challenge to conserve frog species is how control human activities such as, land clearing for forestry, mining, expansion for residential areas and capture for trading, which lead to habitat deforestation, fragmentation and pollution. Damaged habitat cause L. blyhtii distribution obstructed and no migration occur. Inbreeding would increase and lead to decreasing genetic variation and species viability. Anthropogenic activities such as, urbanization, intensive agriculture are some of activities that damaged habitat structures and lead to forest fragmentation17. Anthropogenic activities have great influence to organism habitat quality, including amphibians14. Genetic variation determine organism ability to adapt for environmental changes18.

Based on low genetic variation of L. blythii in the west Sumatra both on inter and intra-population, in situ and ex situ conservation effort need to be planned involving collaboration between government, academics and community.

CONCLUSION

Present study concluded the genetic variation of L. blyhtii was mostly found at Malampah population and the lowest at Harau population. However, overall genetic variety from sampling sites were considered low. The intra-population genetic variety of L. blythii was lower than inter-population and genetic differentiation and gen flow of L. blythii inter-population were considered moderate.

ACKNOWLEDGMENT

Authors would like to send our thanks and gratitude to Directorate General of Higher Education for the research grant with contract number No. 18/KP/010/ KM/2016, February 22 nd, 2016. Express thanks also to BKDSA (Natural Resource Conservation Agency (BKSDA) West Sumatra by authors that had been permitted for collecting frog samples from conservation area protected by Indonesian government with the certificate number: SI.508/BKSDA Sumbar-1/2015 about Conservation Area Entrance Permit (SIMAKSI).

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