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All Journal Biodiversitas Journal of Biological Diversity
RATCHATA PHOCHAYAVANICH
Faculty of Interdisciplinary Studies, Khon Kaen University. Nongkhai Campus, 112 Village No. 7, Nong Kom Ko, Mueang Nong Khai 43000, Nong Khai, Thailand
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology

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Present and future habitat suitability of Mantheyus phuwuanensis under climate change scenario CHANTIP CHUAYNKERN; NUTTAPONG KHAJITMATHEE; RATCHATA PHOCHAYAVANICH; PHANSAMAI PHOMMEXAY; AINGORN CHAIYES; NATHANAËL MAURY; SOMCHIT SUDAVANH; ANCHALEE AOWPHOL; ATTAPOL RUJIRAWAN; SANTI PAILOBLEE; WARONG SUKSAVATE; PRATEEP DUENGKAE; YODCHAIY CHUAYNKERN
Biodiversitas Journal of Biological Diversity Vol. 26 No. 3 (2025)
Publisher : Society for Indonesian Biodiversity

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/biodiv/d260306

Abstract

Abstract. Chuaynkern C, Khajitmathee N, Phochayavanich R, Phommexay P, Chaiyes A, Maury N, Sudavanh S, Aowphol A, Rujirawan A, Pailoblee S, Suksavate W, Duengkae P, Chuaynkern Y. 2025. Present and future habitat suitability of Mantheyus phuwuanensis under climate change scenario. Biodiversitas 26: 1075-1084. The Phu Wua Rock Agama, Mantheyus phuwuanensis, is a diurnal lizard endemic to northeastern Thailand and western Laos, first described in 1991 from Phu Wua Wildlife Sanctuary (northeastern Thailand). Despite being listed as Near Threatened by the IUCN, little is known about its ecological requirements, population dynamics, and the extent of its distribution. This study aims to provide an updated assessment of the species' range and evaluate its habitat suitability under current and future climate scenarios. Field surveys complemented by literature reviews documented 1,994 occurrences of M. phuwuanensis across its range. Using 28 environmental variables, Species Distribution Modeling (SDM) in MaxEnt achieved exceptional predictive accuracy (AUC: 0.993±0.005). Precipitation during the warmest quarter (average 1,519.58±339.04 mm³; range 825-1,855 mm³), distance to unconsolidated sediments (average 6.09±7.51 km; range 0-16.70 km), and slope (average 7.26±2.64 degrees; range 0.24-11.97o) were identified as the primary environmental factors influencing habitat suitability. Current suitable habitats were estimated at 2,715.90 km², primarily concentrated in Laos. Projections for 2050 and 2070 under SSP2-4.5 and SSP5-8.5 climate scenarios revealed alarming habitat reductions of 65.93-88.87%, highlighting the species’ high sensitivity to climate change. Conservation measures are urgently needed to mitigate these impacts. We recommend designating M. phuwuanensis as a protected animal under Thai law and upgrading its CITES status to Appendix III to combat potential overexploitation. Future conservation strategies should prioritize habitat protection, ecological restoration, and cross-border collaboration between Thailand and Laos. These findings offer crucial insights into the vulnerability of M. phuwuanensis and underscore the importance of integrating habitat management with regional conservation efforts.
Present and future habitat suitability of an endemic tree frog, Zhangixalus jarujini, under climate change scenario CHANTIP CHUAYNKERN; NUTTAPONG KHAJITMATHEE; RATCHATA PHOCHAYAVANICH; WASSANA MAIPHROM; EKACHAI PHETCHARAT; AINGORN CHAIYES; PRATEEP DUENGKAE; YODCHAIY CHUAYNKERN
Biodiversitas Journal of Biological Diversity Vol. 26 No. 9 (2025)
Publisher : Society for Indonesian Biodiversity

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/biodiv/d260917

Abstract

Abstract. Chuaynkern C, Khajitmathee N, Phochayavanich R, Maiphrom W, Phetcharat E, Chaiyes A, Duengkae P, Chuaynkern Y. 2025. Present and future habitat suitability of an endemic tree frog, Zhangixalus jarujini, under climate change scenario. Biodiversitas 26: 4445-4456. Zhangixalus jarujini, a tree frog in the family Rhacophoridae and endemic to northeastern Thailand, is increasingly threatened by habitat degradation and the impacts of climate change. This study utilized ecological niche modeling with the Maximum Entropy (MaxEnt) algorithm to evaluate the species’ current and future habitat suitability across Thailand, Laos, and Cambodia. A total of 16 confirmed occurrence records and 14 environmental variables were used to generate highly accurate models (mean AUC: 0.991±0.001). The most influential predictor variables were distance to water bodies (25.7%), precipitation seasonality (Bio15: 24.5%), precipitation of the warmest quarter (Bio18: 15.0%), normalized difference water index (NDWI: 13.3%), precipitation of the driest month (Bio14: 10.8%), and isothermality (Bio3: 9.2%). Under current conditions, the total area of suitable habitat was estimated at 9,964.58 km², comprising 5,837.82 km² of low suitability, 3,393.10 km² of medium suitability, and 733.67 km² of high suitability. Future projections, based on the ACCESS-CM2 climate model, were conducted under two Shared Socioeconomic Pathways: SSP2-4.5 and SSP5-8.5. By 2050, suitable habitat is projected to expand to 12,178.84 km² (22.22%) under SSP2-4.5 and 12,451.58 km² (24.96%) under SSP5-8.5. By 2070, it may reach 12,113.35 km² (21.56%) and 12,559.14 km² (26.44%) under the respective scenarios. High suitability areas are predicted to increase significantly, with a maximum of 1,228.58 km² under SSP5-8.5 by 2070, representing a 67.46% gain. The most influential environmental variables shaping habitat suitability were distance to water bodies, precipitation seasonality, and precipitation during the driest month. While these projections indicate a potential expansion of suitable habitat, actual population persistence may be constrained by ecological limitations, habitat fragmentation, and human pressures. Based on the model outputs and the availability of similar habitats in adjacent regions, this study strongly recommends systematic and intensive field surveys in Thailand, southern Laos, and northern Cambodia to identify potential undocumented populations and refine conservation priorities for Z. jarujini.
Co-Authors AINGORN CHAIYES AINGORN CHAIYES ANCHALEE AOWPHOL ATTAPOL RUJIRAWAN CHANTIP CHUAYNKERN CHANTIP CHUAYNKERN EKACHAI PHETCHARAT NATHANAËL MAURY NUTTAPONG KHAJITMATHEE NUTTAPONG KHAJITMATHEE PHANSAMAI PHOMMEXAY PRATEEP DUENGKAE PRATEEP DUENGKAE SANTI PAILOBLEE SOMCHIT SUDAVANH WARONG SUKSAVATE WASSANA MAIPHROM YODCHAIY CHUAYNKERN YODCHAIY CHUAYNKERN