Abstract
We examined the effects of forest patch size on woody tree species richness and abundance in tropical montane evergreen forest patches of the Nilgiri region, south India. We sampled woody trees (≥ 1 cm dbh) from 21 forest patches in the upper Nilgiri hills (> 2000 m elevation) and recorded a total of 35,146 individuals of 61 species, 45 genera and 30 families. Species richness and abundance of sapling/shrubs (≥ 1 to < 10 cm dbh) increased significantly with increasing patch size, but the species richness and abundance of small, medium and larger trees (≥ 10 to < 30, ≥ 30 to < 60 and ≥ 60 cm dbh, respectively) did not. Overall, forest interior species richness and abundance increased significantly with increasing patch size but edge species richness did not. Species richness and abundance of shade-tolerant and shade-demanding tree species also increased with increasing patch size. The abundance of zoochory dispersed tree species was significantly related to increasing patch size, but those dispersed by autochory did not display any clear relationship between patch size and species richness or abundance. Our findings suggest that with increasing forest patch area, tree compositional patterns may be driven by species specific shade-tolerance adaptations and dispersal patterns. Differential responses in these traits by the plant community within the individual habitat zones of forest edge and interiors likely plays a major role in determining the inherent plant community and thus the subsequent ecological processes of forest patches, including their responses to increasing patch area.
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References
Baez S, Balslev H (2007) Edge effects on palm diversity in rain forest fragments in western Ecuador. Biodivers Conserv 16:2201. https://doi.org/10.1007/s10531-007-9159-5
Baker FS (1949) A revised tolerance table. J For 47:179–181
Berhanu A, Demissew S, Woldu Z, Didita M (2017) Woody species composition and structure of Kuandisha afromontane forest fragment in northwestern Ethiopia. J For Res 28:343–355
Bin Y, Ye WH, Muller-Landau HC, Wu LF, Lian JY, Cao HL (2012) Unimodal tree size distributions possibly result from relatively strong conservatism in intermediate size classes. PLoS ONE 7:e52596. https://doi.org/10.1371/journal.pone.0052596
Cayuela L, Golicher DJ, Benayas JMR, Gonzalez-Espinosa M, Ramirez-Marcial N (2006) Fragmentation, disturbance and tree diversity conservation in tropical montane forests. J Appl Ecol 43:1172–1181
Chazdon RL (2003) Tropical forest recovery: legacies of human impact and natural disturbances. Perspect Plant Ecol Evol Syst 6:51–71. https://doi.org/10.1078/1433-8319-00042
Cochrane MA, Schulze MD (1999) Fire as a recurrent event in tropical forests of the eastern Amazon: effects on forest structure, biomass, and species composition. Biotropica 31:2–16
Collinge SK (1996) Ecological consequences of habitat fragmentation: implications for landscape architecture and planning. Landsc Urban Plan 36:59–77
Dalling JW, Hubbell SP (2002) Seed size, growth rate and gap microsite conditions as determinants of recruitment success for pioneer species. J Ecol 90:557–568
De Angelis DL, Waterhouse JC (1987) Equilibrium and non-equilibrium concepts in ecological models. Ecol Monogr 57:1–21
Echeverria C, Newton AC, Lara A, Benavas JR, Coomes DA (2007) Impacts of forest fragmentation on species composition and forest structure in the temperate landscape of southern Chile. Glob Ecol Biogeogr 16:426–439
Ewers RM, Didham RK (2006) Confounding factors in the detection of species responses to habitat fragmentation. Biol Rev 81:117–142
Ewers RM, Thorpe S, Didham RK (2007) Synergistic interactions between edge and area effects in a heavily fragmented landscape. Ecology 88:96–106
Fahrig L (2013) Rethinking patch size and isolation effects: the habitat amount hypothesis. J Biogeogr 40:1649–1663
Fletcher R (2005) Multiple edge effects and their implications in fragmented landscapes. J Anim Ecol 74:342–352
Forman RTT, Godron M (1986) Landscape ecology. Wiley, New York
Fyson PF (1932) The flora of the south Indian hills, volumes 1–2. Government Press, Chennai
Gamble JS, Fischer CEC (1915–1935) Flora of the presidency of Madras, volumes 1–3. Adlard and Son, London
Godefroid S, Koedam N (2003) Distribution pattern of the flora in a peri-urban forest: an effect of the city-forest ecotone. Landsc Urban Plan 65:169–185
Gonzalez M, Ladet S, Deconchat M, Cabanettes A, Alard D, Balent G (2010) Relative contribution of edge and interior zones to patch size effect on species richness: an example for woody plants. For Ecol Manag 259:266–274
Grashof-Bokdam C (1997) Forest species in an agricultural landscape in the Netherlands: effects of habitat fragmentation. J Veg Sci 8:21–28
Hanski I, Zurita GA, Bellocq MI, Rybicki J (2013) Species–fragmented area relationship. PNAS 110:12715–12720
Harper KA, Macdonald ES, Burton PJ, Chen J, Brosofske KD, Saunders SC, Euskirchen ES, Roberts D, Jaiteh MS, Esseen PA (2005) Edge influence on forest structure and composition in fragmented landscapes. Conserv Biol 19:768–782
Hill J, Curran PJ (2003) Area, shape and isolation of tropical forest fragments: effects on tree species diversity and implications for conservation. J Biogeogr 30:1391–1403
Hosseinzadeh R, Soosani J, Alijani V, Khosravi S, Karimikia H (2016) Diversity of woody plant species and their relationship to physiographic factors in central Zagros forests (Case study: Perc forest, Khorramabad, Iran). J For Res 27:1137–1141
Kolb A, Diekmann M (2005) Effects of life-history traits on responses of plant species to forest fragmentation. Conserv Biol 19:929–938
Kumar S (1993) Survey and mapping of Shola forests and grasslands in the upper Nilgiri plateau and assessment of human utilization of the vegetation. Report submitted to World Wild Fund for Nature, India
Laurance WF (2008) Theory meets reality: how habitat fragmentation research has transcended island biogeographic theory. Biol Conserv 141:1731–1744
Laurance WF, Vasconcelos HL, Lovejoy TE (2000) Forest loss and fragmentation in the Amazon: implications for wildlife conservation. Oryx 34:39–45
Laurance WF, Camargo JLC, Fearnside PM, Lovejoy TE, Williamson GB, Mesquita RCG, Meyer CFJ, Bobrowiec PED, Laurance SGW (2017) An Amazonian rainforest and its fragments as a laboratory of global change. Biol Rev. https://doi.org/10.1111/brv.12343
Levenson JB (1981) Woodlots as biogeographic islands in Southeastern Wisconsin. In: Burgess RL, Sharpe DM (eds) Forest Island dynamics in man-dominated landscapes. Springer, New York, pp 13–66
Li HB, Franklin JF, Swanson FL, Spies TA (1993) Developing alternative forestcutting patterns: a simulation approach. Landsc Ecol 8:63–75
MacArthur RH, Wilson EO (1963) An equilibrium theory of insular zoogeography. Evolution 17:373–387
MacArthur RH, Wilson EO (1967) The theory of island biogeography. Princeton University Press, Princeton, p 203
Magrach A, Rodríguez-Perez J, Campbell M, Laurance WF (2014) Edge effects shape the spatial distribution of lianas and epiphytic ferns. Appl Veg Sci 17:754–764
Majumdar K, Choudhary BK, Datta BK (2016) Changes of woody species diversity, horizontal and vertical distribution of stems across interior to outside within a primate rich habitat of Northeast India. J For Res 27:787–798
Martin PH, Sherman RE, Fahey TJ (2007) Tropical montane forest ecotones: climate gradients, natural disturbance, and vegetation zonation in the Cordillera Central, Dominican Republic. J Biogeogr 34:1792–1806
Matthew KM (1999) The flora of the Palni hills, south India (3 volumes). The Rapinat Herbarium, Thiruchirapalli
Meher-Homji VM (1984) Udhagamandalam (Ootacamund): a biogeographic prespective. J Ind Geogr 59:205–213
Meher-Homji VM (1987) Ecological diversity in the Nilgiri district. J Palynol 23–24:159–166
Mohandass D (2007) Plant diversity and forest dynamics in montane evergreen forest (shola) of the Nilgiri mountains, southern India. Ph.D. thesis. Pondicherry University, India
Mohandass D, Davidar P (2009) Floristic structure and diversity of a tropical montane evergreen forest (shola) of the Nilgiri Mountains, southern India. Trop Ecol 50:219–229
Mohandass D, Davidar P (2010) The relationship between area, and vegetation structure and diversity in montane forest (shola) patches in southern India. Plant Ecol Divers 3:67–76
Mohandass D, Hughes AC, Campbell M, Davidar P (2014) Effects of patch size on liana diversity and distributions in the tropical montane evergreen forests of the Nilgiri Mountains, southern India. J Trop Ecol 30:579–590
Mohandass D, Davidar P, Somasundaram S, Vijayan L, Beng KC (2015) Influence of disturbance regime on liana species composition, density and basal area in the tropical montane evergreen forests (sholas) of the Western Ghats, India. Trop Ecol 56:169–182
Mohandass D, Chhabra T, Pannu RS, Beng KC (2016) Recruitment of saplings in active tea plantations of the Nilgiri Mountains: implications for restoration ecology. Trop Ecol 57:101–118
Pausas JG, Austin MP (2001) Patterns of plant species richness in relation to different environments: an appraisal. J Veg Sci 12:153–165
Puyravaud JP, Davidar P (2013) The Nilgiris Biosphere Reserve: an unrealized vision for conservation. Trop Conserv Sci 6:468–476
Puyravaud JP, Dufour G, Aravajy S (2003) Rain forest expansion mediated by successional processes in vegetation thickets in the Western Ghats of India. J Biogeogr 30:1067–1080
Ries L, Fletcher RJ, Battin J, Sisk TD (2004) Ecological responses to habitat edges: mechanisms, models and variability explained. Annu Rev Ecol Evol Syst 35:491–522
Saunders DA, Hobbs RJ, Margules CR (1991) Biological consequences of ecosystem fragmentation: a review. Conserv Biol 5:18–32
Selwyn MA, Ganesan R (2006) Evaluating the potential role of Eucalyptus plantations in the regeneration of native trees in southern Western Ghats, India. Trop Ecol 50:173–189
Swaine MD, Whitemore TC (1988) On the definition of ecological species groups in tropical rain forest. Vegetatio 75:81–86
Temple SA (1986) Predicting impacts of habitat fragmentation on forest birds: a comparison of two models. In: Verner J, Morrison ML, Ralph CJ (eds) Wildlife zoology: modelling habitat relationships of terrestrial vertebrates. University of Wisconsin Press, Madison, pp 301–304
Zon R, Graves H (1911) Light in relation to tree growth. U.S. Department of Agriculture, USA Forest Service, Washington
Acknowledgements
We are grateful to Dr. Jean-Philippe Puyravaud, Sigur Nature Trust who provided useful suggestions for experimental design and support for this study. We convey our deep gratitude to Prof. Dr. Qing-Jun Li and Dr. T. Muthukumar who provided logistic support and facilities for writing and revise this paper. We thank three anonymous referees especially Language Editor who greatly helped to improve the quality of manuscript and language. We thank Dr. Rama Chandra Prasad for his valuable help with map making and comments given on an earlier version of this manuscript. We thank Dr. Christos Mammides and Dr. V. S. Ramachandran for their valuable comments and language editing in earlier versions. We thank Mr. Hegde and staff of UNITEA Pvt. Ltd, the Tamil Nadu Forest Department and Electricity Board for logistic help and support. This publication was supported by the National Natural Science Foundation of China (NSFC) through Young Scientist Grant No. 31200173, P. R. China. This study was partially supported by a small grant from the Center for Tropical Forest Science, Smithsonian Tropical Research Institute and assistance from Dr. Egbert G. Leigh Jr.
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Project funding: The work was supported by the National Natural Science Foundation of China (NSFC) through Young Scientist Grant No. 31200173, P. R. China and Center for Tropical Forest Science, Smithsonian Tropical Research Institute, Panama.
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Corresponding editor: Tao Xu.
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Mohandass, D., Campbell, M.J. & Davidar, P. Impact of patch size on woody tree species richness and abundance in a tropical montane evergreen forest patches of south India. J. For. Res. 29, 1675–1687 (2018). https://doi.org/10.1007/s11676-018-0592-y
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DOI: https://doi.org/10.1007/s11676-018-0592-y