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All Journal Biodiversitas Journal of Biological Diversity
NUTTAPONG KHAJITMATHEE
Department of Biology, Faculty of Science, Khon Kaen University. 123 Village No. 16, Mittraphap Rd., Nai-Mueang, Mueang Khon Kaen 40002, Khon Kaen, Thailand
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology

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Current distribution and habitat suitability for the present and future scenarios of Cyrtodactylus angularis in Thailand NUTTAPONG KHAJITMATHEE; NITHINA KAEWTONGKUM; AINGORN CHAIYES; WARONG SUKSAVATE; PRATEEP DUENGKAE; PONGPITAK SRIBANDIT; RATCHATA PHOCHAYAVANICH; CHANTIP CHUAYNKERN; 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/d260302

Abstract

Abstract. Khajitmathee N, Kaewtongkum N, Chaiyes A, Suksavate W, Duengkae P, Sribandit P, Phochayavanich R, Chuaynkern C, Chuaynkern Y. 2025. Current distribution and habitat suitability for the present and future scenarios of Cyrtodactylus angularis in Thailand. Biodiversitas 26: 1039-1050. The genus Cyrtodactylus, with approximately 381 species, is among the most speciose in the family Gekkonidae. Cyrtodactylus angularis, an endemic species of Thailand, was assessed for habitat suitability using Ecological Niche Modeling (ENM). This study evaluates the species' potential risks under current and future environmental conditions. Species identification was based on photographic evidence and morphological traits. The MaxEnt model was employed to estimate the species' potential distribution. The analysis identified dry evergreen forests as the primary environmental variable influencing habitat suitability, showing a strong positive correlation with the species. The current habitat suitability area for C. angularis is estimated at 5,879.51 km². Under future climate scenarios, habitat suitability areas are projected to decrease significantly. By 2050, the habitat suitability areas are expected to shrink by 372.00 km² (-6.33%) under SSP2-4.5 and 2,121.69 km² (-36.09%) under SSP5-8.5. 2070 further reductions are anticipated, with declines of 2,120.05 km² (-36.06%) under SSP2-4.5 and 5,309.17 km² (-90.30%) under SSP5-8.5. These projections highlight the substantial threat climate change poses to the species' habitat. The Phu Khiao-Nam Nao and Dong Phaya Yen-Khao Yai Forest Complexes are identified as key potential preserves for C. angularis. We recommend prioritizing these areas for conservation efforts to protect the species from future environmental changes. Additionally, intensive surveys across the species' full range are essential to enhance our understanding of its ecological niche. Expanding occurrence data from under-surveyed regions will improve habitat suitability models and help identify critical microhabitats, supporting more effective conservation planning.
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.
Co-Authors AINGORN CHAIYES AINGORN CHAIYES ANCHALEE AOWPHOL ATTAPOL RUJIRAWAN CHANTIP CHUAYNKERN NATHANAËL MAURY NITHINA KAEWTONGKUM PHANSAMAI PHOMMEXAY PONGPITAK SRIBANDIT PRATEEP DUENGKAE RATCHATA PHOCHAYAVANICH RATCHATA PHOCHAYAVANICH SANTI PAILOBLEE SOMCHIT SUDAVANH WARONG SUKSAVATE YODCHAIY CHUAYNKERN