HC, Chetana and T, Ganesh (2012) Importance of shade trees (Grevillea robusta) in the dispersal of forest tree species in managed tea plantations of southern Western Ghats, India. Journal of Tropical Ecology, 28 (2). pp. 187-197.

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Abstract

Abandoned plantations of coffee, tea and other commercial crops offeropportunities forunderstanding ecological processes in modified forest ecosystems. Unlike tree plantations tea is maintained as a shrub with a continuous dense short canopy that precludes large-frugivore activity thereby limiting dispersal of forest species to such areas. In this study we determine how location and density of Grevillea robusta a shade tree in tea plantations and proximity of plantations to forests influences seed arrival from forests into the plantations. We also estimate the importance of dispersal modes in the colonization processes. We laid 10 x 10-m plots at three distance intervals from the forest edge in three different plantation types with varying shade tree densities. Within the plots we laid four 1x 1-m subplots at the corners of the plot. We estimated species richness, abundance and categorized the seeds into dispersal modes in these plots. Grevillea robusta increased species richness of seeds by three times and abundance of seeds by 3-30 times compared with plantations without them. Higher density of G. robusta increased seed input changed species composition and altered species dominance in the plantations. Distance to forests influenced seed arrival in plantations without G.robusta trees and plots 95 m from the forest did not have any seeds in them. No such effectwas seen in plantations with G.robusta trees. Seeds dispersed by birds or a combination ofbirds and mammals contribute 30% of the seeds reaching the plantations with G. robusta and this was not influenced by distance from the forest. In plantations without G. robusta bird dispersal is restricted to 2 5 m from the forest edge. In general density of shade trees has a strong influence on seed arrival which can negate the forest proximity effectand enhance natural forest colonization.

Item Type: Article
Additional Information: Copyright of this article belongs to the Cambridge University Press.
Uncontrolled Keywords: frugivores, seed dispersal, shade tree, tea, Western Ghats.
Subjects: A ATREE Publications > G Journal Papers
Divisions: SM Sehgal Foundation Centre for Biodiversity and Conservation
Depositing User: Ms Suchithra R
Date Deposited: 02 Dec 2025 03:56
Last Modified: 02 Dec 2025 04:39
URI: http://archives.atree.org/id/eprint/1246

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