The Shola (Tropical Montane Forest)-Grassland Ecosystem Mosaic of Peninsular India: A Review

Abstract

Tropical montane forests (alternatively called tropical montane cloud forests or simply cloud forests) represent some of the most threatened ecosystems globally. Tropical montane forests (TMF) are characterized and defined by the presence of persistent cloud cover. A significant amount of moisture may be captured through the condensation of cloud-borne moisture on vegetation distinguishing TMF from other forest types. This review examines the structural, functional and distributional aspects of the tropical montane forests of peninsular India, locally known as shola, and the associated grasslands. Our review reveals that small fragments may be dominated by edge effect and lack an “interior” or “core”, making them susceptible to complete collapse. In addition to their critical role in hydrology and biogeochemistry, the shola-grassland ecosystem harbor many faunal species of conservation concern. Along with intense anthropogenic pressure, climate change is also expected to alter the dynamic equilibrium between the forest and grassland, raising concerns about the long-term sustainability of these ecosystems.

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M. Bunyan, S. Bardhan and S. Jose, "The Shola (Tropical Montane Forest)-Grassland Ecosystem Mosaic of Peninsular India: A Review," American Journal of Plant Sciences, Vol. 3 No. 11, 2012, pp. 1632-1639. doi: 10.4236/ajps.2012.311198.

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1] L. A. Bruijnzeel and L. S. Hamilton, “Decision Time for Cloud Forests,” IHP Humid Tropics Programme Series, No. 13, UNESCO, Paris, 2000.
[2] P. Bubb, I. May, L. Miles and J. Sayer, “Cloud Forest Agenda,” UNEP-WCMC, Cambridge, 2004. http://www.unep-wcmc.org/resources/publications/UNEP_WCMC_bio_series/20.htm
[3] N. Myers, R. A. Mittermeier, C. G. Mittermeier, G. A. B. da Fonseca and J. Kent, “Biodiversity Hotpots for Conservation Priorities,” Nature, Vol. 491, No. 333, 2000, pp. 853-858. doi:10.1038/35002501
[4] W. L. Werner, “Biogeography and Ecology of the Upper Montane Rain Forest of Sri Lanka (Ceylon),” In: L. S. Hamilton, J. O. Juvik and F. N. Scatena, Eds., Ecological Studies 110: Tropical Montane Cloud Forests, Springer-Verlag, New York, 1995, pp. 343-352. doi:10.1007/978-1-4612-2500-3_25
[5] H. Somanathan and R. M. Borges, “Influence of Exploitation on Population Structure, Spatial Distribution and Reproductive Success If Dioecious Species in Fragmented Cloud Forest in India,” Biological Conservation, Vol. 80, 2000, pp. 9-15.
[6] L. S. Hamilton, J. O. Juvik and F. N. Scatena, “Ecological Studies 110: Tropical Montane Cloud Forests,” Springer-Verlag, New York, 1995. doi:10.1007/978-1-4612-2500-3
[7] K. K. N. Nair, S. K. Khanduri and K. Balasubramanayam, “Shola Forests of Kerala: Environment and Biodiversity,” Kerala Forest Research Institute, Peechi, 2001.
[8] C. R. Ranganathan, “Studies in the Ecology of the Shola Grassland Vegetation of the Nilgiri Plateau,” Indian Forester, Vol. 64, 1938, pp. 523-541.
[9] F. E. Clements, “Nature and Structure of Climax,” Journal of Ecology, Vol. 24, No. 1, 1936, pp. 252-284. doi:10.2307/2256278
[10] N. L. Bor, “The Vegetation of the Nilgiris,” Indian Forester, Vol. 64, 1938, pp. 600-609.
[11] W. A. Noble, “The Shifting Balance of Grasslands, Shola Forests and Planted Trees on the Upper Nilgiris, Southern India,” Indian Forester, Vol. 93, 1967, pp. 691-693.
[12] S. Jose, A. Sreepathy, B. Mohan Kumar and V. K. Venugopal, “Structural, Floristic and Edaphic Attributes of the Shola-Grassland Forests of Eravikulam in Peninsular India,” Forest Ecology and Management, Vol. 65, No. 2-3, 1994, pp. 279-291. doi:10.1016/0378-1127(94)90176-7
[13] R. Sukumar, H. S. Suresh and R. Ramesh, “Climate Change and Its Impact on Tropical Montane Ecosystems in Southern India,” Journal of Biogeography, Vol. 22, No. 2-3, 1995, pp. 533-536. doi:10.2307/2845951
[14] K. Sudhakara, “Inventory and Computerized Herbarium of Higher Plants in the Sholas of Munnar, Idukki District,” In: K. K. N. Nair, S. K. Khanduri and K. Balasubramanayam, Eds., Shola Forests of Kerala: Environment and Biodiversity, Kerala Forest Research Institute, Peechi, 2001, pp. 179-208.
[15] S. M. Thomas and M. W. Palmer, “The Montane Grasslands of the Western Ghats, India: Community Ecology and Conservation,” Community Ecology, Vol. 8, No. 1, 2007, pp. 67-73. doi:10.1556/ComEc.8.2007.1.9
[16] P. V. Karunakaran, G. S. Rawat and V. K. Uniyal, “Ecology and Conservation of the Grasslands of Eravikulam National Park and the Western Ghats,” Wildlife Institute of India, Dehradun, 1998.
[17] H. S. Suresh and R. Sukumar, “Phytogeographical Affinities of Flora of Nilgiri Biospehere Reserve,” Rheedea, Vol. 9, No. 1, 1999, pp. 1-21.
[18] K. K. N. Nair and A. R. R. Menon, “Endemic Arborescent Flora of the Sholas of Kerala and Its Population and Regeneration Status,” In: K. K. N. Nair, S. K. Khanduri and K. Balasubramanayam, Eds., Shola Forests of Kerala: Environment and Biodiversity, Kerala Forest Research Institute, Peechi, 2001. pp. 209-236.
[19] P. Davidar, D. Mohandass and S. L. Vijayan, “Floristic Inventory of Woody Plants in a Tropical Montane Forest in the Palni Hills of the Western Ghats, India,” Tropical Ecology, Vol. 48, No. 1, 2007, pp. 15-25.
[20] K. Swarupanandan, N. Sasidharan, K. C. Chacko and S. C. Basha, “Floristic and Ecological Studies on the Sholas of Idukki District,” In: K. K. N. Nair, S. K. Khanduri and K. Balasubramanayam, Eds., Shola Forests of Kerala: Environment and Biodiversity, Kerala Forest Research Institute, Peechi, 2001, pp. 259-286.
[21] S. Jose, A. R. Gillespie, S. J. George and M. K. Kumar, “Vegetation Response along Edge-Interior Gradients in a High Altitude Tropical Forest in Peninsular India,” Forest Ecology and Management, Vol. 87, No. 1-3, 1996, pp. 51-62. doi:10.1016/S0378-1127(96)03836-4
[22] K. S. Murali, R. S. Shetty, K. N. Ganeshaiah and R. U. Shaanker, “Does Forest Type Classification Reflect Spatial Dynamics of Vegetation? An Analysis Using GIS Techniques,” Current Science, Vol. 75, No. 3, 1998, pp. 220- 227.
[23] Vishnu-Mittre and H. P. Gupta, “A Living Fossil Community in South Indian Hills,” Current Science, Vol. 37, No. 23, 1968, pp. 671-672.
[24] R. K. Srivastava, “Seed Germination Tests of Pioneer Shola Species in Nilgiris,” Annals of Forestry, Vol. 8, No. 2, 2000, pp. 293-294.
[25] P. Foster, “The Potential Negative Impacts of Global Climate Change on Tropical Montane Cloud Forests,” Earth Science Reviews, Vol. 55, No. 1-2, 2001, pp. 73- 106. doi:10.1016/S0012-8252(01)00056-3
[26] D. H. Benzing, “Vulnerabilities of Tropical Forests to Climate Change: The Significance of Resident Epiphytes,” Climatic Change, Vol. 39, No. 2-3, 1998, pp. 519-540. doi:10.1023/A:1005312307709
[27] A. M. Sugden, “Aspects of Ecology of Vascular Epiphytes in Two Colombian Cloud Forests: II. Habitat Preferences of Bromeliaceae in the Serrania de Macuira,” Selbyana, Vol. 5, 1981, pp. 264-273.
[28] T. K. Abraham, “Meliolaceous and Soil Fungi and Lichen Flora of the Sholas of Munnar and Waynad,” In: K. K. N. Nair, S. K. Khanduri and K. Balasubramanayam, Eds., Shola Forests of Kerala: Environment and Biodiversity, Kerala Forest Research Institute, Peechi, 2001, pp. 118-135.
[29] V. Jeeva and P. S. Ramakrishnan, “Studies on Impact of Plantation Forestry in Nilgiri Hills of the Ghats on Soil Quality and Nutrient Cycling,” Tropical Ecology, Vol. 38, No. 2, 1997, pp. 215-235.
[30] E. R. C. Davidar, “A Note on the Status of the Nilgiri Tahr in the Grass Hills in the Anamalais,” Journal of the Bombay Natural History Society, Vol. 68, No. 2, 1971, pp. 347-354.
[31] C. Rice, “The Behavior and Ecology of the Nilgiri Tahr (Hemitragus Hylocrius Ogilby, 1838),” Ph.D. Thesis, Texas A & M University, Texas, 1984.
[32] C. Rice, “Habitat, Population Dynamics and Conservation of the Nilgiri Tahr, Hemitragus hylocrius,” Biological Conservation, Vol. 44, No. 3, 1988, pp. 137-156. doi:10.1016/0006-3207(88)90099-7
[33] C. Mishra and A. J. T. Johnsingh, “Population and Conservation Status of the Nilgiri Tahr Hemitragus hylocrius in Anamalai Hill, South India,” Biological Conservation, Vol. 86, No. 2, 1998, pp. 199-206. doi:10.1016/S0006-3207(98)00004-4
[34] Daniels, “The Nilgiri Tahr: An Endemic South Indian Mountain Goat,” Macmillan India, New Delhi, 2006.
[35] R. J. R. Daniels, P. S. Easa and M. Alembath, “Distribution and Status of the Endangered Nilgiri Tahr,” Current Science, Vol. 94, No. 1, 2008, pp. 10-11.
[36] M. Alembath and C. Rice, “Nilgiritragus Hylocrius,” IUCN Red List of Threatened Species, 2008. www.iucnredlist.org
[37] K. Shanker, “The Role of Competition and Habitat in Structuring Small Mammal Communities in a Tropical Montane Forest Ecosystem in Southern India,” Journal of Zoology, Vol. 253, No. 1, 2001, pp. 15-24. doi:10.1017/S0952836901000024
[38] A. A. Zarri, A. R. Rahmani, A. Singh and S. P. S. Khushwaha, “Habitat Suitability Assessment for the Endangered Nilgiri Laughing Thrush: A Multiple Logistic Regression Approach,” Current Science, Vol. 94, 2008, pp. 1487- 1494.
[39] K. P. Dinesh, C. Radhakrishnan and G. Bhatta, “A New Species of Nyctibatrachus Boulenger (Amphibia: Anura: Nyctibatrachidae) from the Surroundings of Bhadra Wild-life Sacntuary, Western Ghats, India,” Zootaxa, Vol. 1914, 2008, pp. 45-56.
[40] A. Gioda, J. Maley, R. E. Guasp and A. A. Baladón, “Some Low Elevation Fog Forests of Dry Environments: Application to African Palaeoenvironments,” In: L. S. Hamilton, J. O. Juvik, F. N. Scatena, Eds., Ecological Studies 110: Tropical Montane Cloud Forests, Springer-Verlag, New York, 1995, pp. 156-164.
[41] J. Krishnaswamy, M. C. Kiran and K. N. Ganeshaiah, “Tree Model Based Eco-Climatic Vegetation Classification and Fuzzy Mapping in Diverse Tropical Deciduous Ecosystems Using Multi-Date NDVI,” International Journal of Remote Sensing, Vol. 25, No. 6, 2005, pp. 1185- 1205. doi:10.1080/0143116031000149989
[42] T. P. Thomas and S. Sankar, “The Role of Sholas in Maintaining Watercourses in the High Ranges of Kerala,” In: K. K. N. Nair, S. K. Khanduri and K. Balasubrama-nayam, Eds., Shola Forests of Kerala: Environment and Biodiversity, Kerala Forest Research Institute, Peechi, 2001, pp. 71-115.
[43] D. C. Sahoo, V. N. Sharda, M. Jayakumar, K. P. Tripathi, M. V. Padmanabhan, B. Raghunath and B. Chandran, “Hydrology of Small Watersheds in High Hills of Nilgiris,” Indian Journal of Soil Conservation, Vol. 34, 2006, pp. 97-101.
[44] R. K. Gupta and K. A. Shankarnarayan, “Ecological Status of the Grasslands in South India,” Tropical Ecology, Vol. 3, 1962, pp. 75-78.
[45] V. Nandakumar, P. Rajendran and K. N. Babu, “Characterization of Soils in the Sholas of Idukki and Wayanad Districts,” In: K. K. N. Nair, S. K. Khanduri and K. Balasubramanayam, Eds., Shola Forests of Kerala: Environment and Biodiversity, Kerala Forest Research Institute, Peechi, 2001, pp. 25-70.
[46] S. Venkatachalam, T. Kalaiselvi, Neelakantan and S. Gun-asekaran, “A Comparative Study on Soil Microflora and Nutrient Status of Sholas and Adjoining Vegetation,” In-dian Journal of Forestry, Vol. 30, 2007, pp. 135-140.
[47] K. V. Sankaran and M. Balasundaram, “Soil Microflora of the Sholas of Eravikulam National Park, Idukki District,” In: K. K. N. Nair, S. K. Khanduri and K. Balasubrama-nayam, Eds., Shola Forests of Kerala: Environment and Biodiversity, Kerala Forest Research Institute, Peechi, 2001, pp. 151-178.
[48] R. M. May, “Thresholds and Breakpoints in Ecosystems with Multiplicity of States,” Nature, Vol. 269, 1977, pp. 471-477. doi:10.1038/269471a0
[49] B. E. Beisner, D. T. Haydon and K. Cuddington, “Alternative Stable States in Ecology,” Frontiers in Ecology and the Environment, Vol. 1, No. 7, 2003, pp. 376-382. doi:10.1890/1540-9295(2003)001[0376:ASSIE]2.0.CO;2
[50] V. M. Meher-Homji, “Ecological Status of the Montane Grasslands of the South Indian Hills: A Phytogeographic Reassessment,” Indian Forester, Vol. 91, No. 4, 1965, pp. 210-215.
[51] V. M. Meher-Homji, “Phytogeography of the South Indian Hill Stations,” Bulletin of the Torrey Botanical Club, Vol. 94, No. 4, 1967, pp. 230-242. doi:10.2307/2483901
[52] K. Balasubramanian and K. K. Kumar, “The Riddle of the Shola,” Evergreen, Vol. 42, 1999, pp. 1-5.
[53] R. M. Palanna, “Eucalyptus in India,” In: M. Kashio and K. White, Eds., Reports Submitted to the Regional Expert Consultation on Eucalyptus, Vol. 2, 1996. http://www.fao.org/docrep/005/ac772e/ac772e06.htm#bm06
[54] R. K. Srivastava, “Biotic Pressure and Entry of Exotics in Shola Grassland Ecosystem of Upper Palnis,” Indian Journal of Forestry, Vol. 24, No. 3, 2001, pp. 324-327.
[55] R. Raghupathy and M. Madhu, “The Natural Grasslands of the Nilgiris: Past and Present Scenario,” Range Management and Agroforestry, Vol. 28, 2007, pp. 271-273.
[56] S. C. Agrawal, U. S. Madan, S. Chinnamani and N. D. Rege, “Ecological Studies in the Nilgiris,” Indian Forester, Vol. 87, No. 6, 1961, pp. 376-389.
[57] S. Seshan, “Notes from the Edge,” 2006. http://www.gbsanctuary.org/articles/Notes_from_the_Edge.pdf
[58] T. Sekar, “Observations on Survival and Growth of Different Shola Species under a Shola Afforestation Programme in Nilgiris District, Tamil Nadu,” Indian Forester, Vol. 134, No. 4, 2008, pp. 451-457.
[59] U. M. Chandrasekhara, P. K. Muraleedharan and V. Sibichan, “Disturbed Sholas of Kerala and Strategies for Its Conservation and Management,” In: K. K. N. Nair, S. K. Khanduri and K. Balasubramanayam, Eds., Shola Forests of Kerala: Environment and Biodiversity, Kerala Forest Research Institute, Peechi, 2001, pp. 395-437.
[60] T. M. Brooks, R. A. Mittermeier, C. G. Mittermeier, G. A. B. da Fonseca, A. B. Rylands, W. R. Konstant, P. Flick, J. Pilgrim, S. Oldfield, G. Magin and C. Hilton-Taylor, “Habitat Loss and Extinction in the Hotspots of Biodiversity,” Conservation Biology, Vol. 16, No. 4, 2002, pp. 909-923. doi:10.1046/j.1523-1739.2002.00530.x.
[61] I. M. Turner and R. T. Corlett, “The Conservation Value of Small, Isolated Fragments of Lowland Tropical Rain Forest,” Trends in Ecology and Evolution, Vol. 11, No. 8, 1996, pp. 330-333. doi:10.1016/0169-5347(96)10046-X
[62] K. A. Harper, S. E. Macdonald, P. J. Burton, J. Q. Chen, K. D. Brosofske, S. C. Saunders, E. S. Euskirchen, D. Roberts, M. S. Jaiteh and P. A. Esseen, “Edge Influence on Forest Structure and Composition in Forest Fragments,” Conservation Biology, Vol. 19, No. 3, 2005, pp. 768-782. doi:10.1111/j.1523-1739.2005.00045.x
[63] C. G. Gascon, B. Williamson and G. A. B. da Fonseca, “Receding Forest Edges and Vanishing Reserves,” Science, Vol. 288, No. 5470, 2000, pp. 1356-1358. doi:10.1126/science.288.5470.1356

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