Treesearch

Millipedes, among other soil fauna, are important components of ecosystems because of their role in nutrient cycling. In this study, we quantified the density, biomass, and richness (in terms of order) of millipedes along a toposequence (ridges, slopes, and valleys) and different ground layers (litter, humus, 0-5 cm soil depth, and 5-10 cm soil depth) in a subtropical wet forest in Puerto Rico. Millipedes were surveyed from twelve 50 x 50 cm plots (3 topographic positions x 4 replicates) by hand sorting. Four orders of millipedes were found in El Verde tabonuco forest: Stemmiulida (the...

During June 17 and 18, 2008, a Castilla elastica forest located in El Tallonal, municipality of Arecibo, functioned as a carbon sink. The net photosynthetic rate ranged from 14.28 (native species) and 21.96 (C. elastica) g C m-1 day-1 and respiration of leaves, stems, and soil varied from 13.76 (native species) and 16.88 (C. elastica) g C m-1 day-1. The net accumulation of carbon in the forest ranged from 0.52 (native species) and 5.08 (C. elastica) g C m-1 day-1. These values may change significantly during days with low rates of photosynthesis and depending on how respiration rates in...

Puerto Rico faces a number of problems common to much of the world. Population is increasing while land area is not, and there are reassessments of land use policy and practice to accommodate growing populations, shifting economies, and changing public value systems. Puerto Rico shares similarities with the Eastern United States with its history of agricultural abandonment, relatively high population density, and abundance of “forested” suburban areas in the wildland-urban interface. Puerto Rico has affinities with other tropical regions with high biodiversity and an abundance of rare...

Diurnal field observations in secondary forests dominated by the introduced African tulip tree (Spathodea campanulata) in Puerto Rico show a faunal assemblage that consists mostly of native species (81.1 percent). The most abundant species were common birds and reptiles, yet some uncommon fauna appear to be visiting or residing in these forests. The observations suggest these forests have the potential to provide resources and habitat for uncommon or endangered species. Systematic studies on the fauna associated to these forests are needed, especially for less conspicuous species and those...