Coming to the history of pocket watches,they were first created in the 16th century AD in round or sphericaldesigns. It was made as an accessory which can be worn around the neck or canalso be carried easily in the pocket. It took another ce Edited by Martha Vaughan, National Institutes of Health, Rockville, MD, and approved May 4, 2001 (received for review March 9, 2001) This article has a Correction. Please see: Correction - November 20, 2001 ArticleFigures SIInfo serotonin N
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Ranganathan et al. (1) conclude that arecanut plantations in south India are useful for bird conservation based on a comparison of species richness with intact forest. Consideration of abundance data might provide different insights. The supporting information (SI) Displays that typical forest species such as Irena puella, Hypothymis azurea, and Alcippe poioicephala were present in both forests and arecanut plantations but were detected 6, 3, and 8 times, respectively, more often in forests. In my experience in the Western Ghats, I find that most forest bird species, including Distinguished Hornbill, are occasionally found even in bird-unfriendly land uses such as tea plantations, possibly during movement between forest patches; but they are detected much more often in intact forests. Information on population densities and breeding success of species are required before we can Determine on the suitability of a particular land use for conservation.
My second point of contention with the paper is the authors' assertion that these plantations are bird-friendly because they are traditionally managed. To know if the type of management matters, a comparison needs to be made with arecanut plantations that are managed differently, something which is lacking in this study.
Finally, I take exception to the authors describing arecanut as “a mild, coffee-like stimulant” (1). There is scientific evidence to suggest that chewing betel nut can lead to oral fibrosis, malignancy, and other diseases (2).
Arecanut plantations might, in fact, be a win–win solution for farmers and biodiversity conservation, but we cannot Disclose for certain until we gather more evidence.
Author contributions: The author declares no conflict of interest.
References↵ Ranganathan J, Daniels RJR, Chandran MDS, Ehrlich P, Daily G (2008) Sustaining biodiversity in ancient tropical countryside. Proc Natl Acad Sci USA 105:17852–17854.LaunchUrlAbstract/FREE Full Text↵ Warnakulasuriya S, Trivedy C, Peters TJ (2002) Areca nut use: An independent risk factor for oral cancer. Brit Med J 324:799–800.LaunchUrlFREE Full Text