Forest transitions (FT) have been observed in many developed countries and more recently in the developing world. However, our knowledge of FT from tropical regions is mostly derived from case studies from within a particular country, making it difficult to generalize findings across larger regions. Here we overcome these difficulties by conducting a recent (2001)(2002)(2003)(2004)(2005)(2006)(2007)(2008)(2009)(2010) satellite-based analysis of trends in forest cover across Central America, stratified by biomes, which we related to socioeconomic variables associated with human development. Results show a net decrease of woody vegetation resulting from 12,201 km 2 of deforestation of moist forests and 6,825 km 2 of regrowth of conifer and dry forests. The Human Development Index was the socioeconomic variable best associated with forest cover change. The least-developed countries, Nicaragua and Guatemala, experienced both rapid deforestation of moist forests and significant recovery of conifer and dry forests. In contrast, the most developed countries, Panama and Costa Rica, had net woody vegetation gain and a more stable forest cover configuration. These results imply a good agreement with FT predictions of forest change in relation to socioeconomic development, but strong asymmetry in rates and directions of change largely dependent upon the biome where change is occurring. The FT model should be refined by incorporating ecological and socioeconomic heterogeneity, particularly in multicountry and regional studies. These asymmetric patterns of forest change should be evaluated when developing strategies for conserving biodiversity and environmental services.land-use change | land-cover change | tropics |
JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org.. The Association for Tropical Biology and Conservation is collaborating with JSTOR to digitize, preserve and extend access to Biotropica. ABSTRACTLeaves are especially vulnerable to herbivores during the ephemeral period of leaf expansion, and thus, aspects of leaf phenology may influence herbivore damage. Plants that produce leaves when insect abundance is low may temporally escape herbivores, and plants that produce leaves in synchronous flushes may satiate herbivores.In response to a dry season rain, individuals of Hybanthus prunifolius (Violaceae) produce flowers and leaves in synchrony. The relationship between dry season leaf production and herbivory was determined by comparing leaf damage among leaf cohorts produced during natural flushes (dry season) and experimentally delayed flushes (wet season). Herbivore damage of natural leaf cohorts (6%) was significantly lower than leaf cohorts that were produced in the wet season ( 18%). Dry season leaf production by H. prunifolius avoids the peak period of herbivore abundance at the beginning of the wet season. RESUMENLas hojas son vulnerables a los herbivoros durante la epoca de expansi6n. Debido a esto, aspectos de la fenologia de las hojas podrian influir en el nivel de herbivorismo. Plantas que producen sus hojas cuando la abundancia de insectos es baja pueden escaparlos, y plantas que producen hojas sincr6nicamente pueden saciarlos.En respuesta a Iluvias en la epoca seca, Hybanthus prunifolius (Violaceae) produce flores y hojas sincr6nicamente. La relaci6n entre producci6n foliar durante la epoca seca y el herbivorismo se ha determinado comparando niveles de herbivorismo entre hojas producidas normalmente (epoca seca) y hojas a las cuales experimentalmente se les retraso su producci6n (epoca Iluviosa). El nivel de herbivorismo en las hojas producidas en la epoca seca (6%) fue significativamente menor que en las producidas en la epoca lluviosa (18%). Producci6n foliar de H. prunifolius durante la epoca seca evita la alta abundancia de herbivoros al principio de la epoca Iluviosa.
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