TY - JOUR
T1 - Local and landscape characteristics shape amphibian communities across production landscapes in the Western Ghats
AU - Sankararaman, Vishnupriya
AU - Dalvi, Shashank
AU - Miller, David A.W.
AU - Karanth, Krithi K.
N1 - Funding Information:
The authors acknowledge support from the Centre for Wildlife Studies, University of Wisconsin–Madison, University of Illinois–UC, Indian School of Business, Wildlife Conservation Society and Penn State University for institutional support. The authors thank Paul, Robbins, Ashwini Chhatre, K. U. Karanth, J. D. Nichols and M. C. Vinay Kumar. The authors thank research fellows and all the volunteers: A. Dey, A. Jain, K. Keerthi, S. Sawant, A. Belliappa, C. Bandi, A. Munje, V. Chourasiya, A. Ashratha, V. Jathar, H. P. Hari, S. Nayak and V. Gupta who assisted with fieldwork. The authors are grateful to and acknowledge the plantation owners who allowed to conduct the sampling. This article is based upon research supported by NSF Grant Number 1265223 and Oracle to Karanth.
Publisher Copyright:
© 2021 The Authors. Ecological Solutions and Evidence published by John Wiley & Sons Ltd on behalf of British Ecological Society.
PY - 2021/10/1
Y1 - 2021/10/1
N2 - Global tropical forests have been modified and fragmented by commodity agroforests, leading to significant alterations in ecological communities. Nevertheless, these production landscapes offer secondary habitats that support and sustain local biodiversity. In this study, we assess community level and species-specific responses of amphibians to land management in areca, coffee and rubber, three of the largest commodity agroforests in the Western Ghats. A total of 106 agroforests across a 30,000-km2 landscape were surveyed for amphibians using a combination of visual and auditory encounter surveys. We used a Bayesian multi-species occupancy modelling framework to examine patterns of species richness, beta diversity, dominance structure and individual species occupancies. The influence of biogeographic variables such as elevation and latitude as well as microhabitat availability of streams, ponds and unpaved plantation roads was tested on amphibian species occupancy. Coffee agroforests had the highest species richness and lowest dominance when compared to areca and rubber. Beta diversity was highest in areca for within agroforest measures. Compared across agroforests, coffee had highest beta diversity with areca and rubber. Both elevation and latitude showed an overall positive association with amphibian occupancy, although species-specific responses varied considerably. Microhabitat availability was one of the strongest predictors of amphibian occupancy, with mean community response being positive with presence of water bodies and roads. Pond presence increased species richness per site by 34.7% (species-specific responses in occupancy ranged from –2.7% to 327%). Stream presence alone did not change species richness but species-specific response ranged from –59% to 273%. Presence of plantation roads also increased species richness by 21.5% (species-specific response ranged from –82% to 656%). Being unpaved with little vehicular traffic, plantation roads seem to provide additional habitats for amphibians. Presence of all three microhabitats at a site increased species richness by 75%. Our study highlights the importance of land management strategies that maintain diverse native canopy and freshwater bodies and other microhabitats in sustaining amphibian fauna. Market-driven land-use change from coffee to other agroforest types will have detrimental effects on amphibian communities and their long-term sustainability in the Western Ghats.
AB - Global tropical forests have been modified and fragmented by commodity agroforests, leading to significant alterations in ecological communities. Nevertheless, these production landscapes offer secondary habitats that support and sustain local biodiversity. In this study, we assess community level and species-specific responses of amphibians to land management in areca, coffee and rubber, three of the largest commodity agroforests in the Western Ghats. A total of 106 agroforests across a 30,000-km2 landscape were surveyed for amphibians using a combination of visual and auditory encounter surveys. We used a Bayesian multi-species occupancy modelling framework to examine patterns of species richness, beta diversity, dominance structure and individual species occupancies. The influence of biogeographic variables such as elevation and latitude as well as microhabitat availability of streams, ponds and unpaved plantation roads was tested on amphibian species occupancy. Coffee agroforests had the highest species richness and lowest dominance when compared to areca and rubber. Beta diversity was highest in areca for within agroforest measures. Compared across agroforests, coffee had highest beta diversity with areca and rubber. Both elevation and latitude showed an overall positive association with amphibian occupancy, although species-specific responses varied considerably. Microhabitat availability was one of the strongest predictors of amphibian occupancy, with mean community response being positive with presence of water bodies and roads. Pond presence increased species richness per site by 34.7% (species-specific responses in occupancy ranged from –2.7% to 327%). Stream presence alone did not change species richness but species-specific response ranged from –59% to 273%. Presence of plantation roads also increased species richness by 21.5% (species-specific response ranged from –82% to 656%). Being unpaved with little vehicular traffic, plantation roads seem to provide additional habitats for amphibians. Presence of all three microhabitats at a site increased species richness by 75%. Our study highlights the importance of land management strategies that maintain diverse native canopy and freshwater bodies and other microhabitats in sustaining amphibian fauna. Market-driven land-use change from coffee to other agroforest types will have detrimental effects on amphibian communities and their long-term sustainability in the Western Ghats.
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U2 - 10.1002/2688-8319.12110
DO - 10.1002/2688-8319.12110
M3 - Article
AN - SCOPUS:85129880285
SN - 2688-8319
VL - 2
JO - Ecological Solutions and Evidence
JF - Ecological Solutions and Evidence
IS - 4
M1 - e12110
ER -