Browsing Facultad de Artes y Ciencias by Title
Now showing items 2-21 of 58
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A Fluorescent Marking and Re-count Technique Using the Invasive Earthworm, Pontoscolex corethrurus (Annelida: Oligochaeta)
(Caribbean Journal of Science, Vol. 42, No. 3, 371-379, 2006, 2006-12)We used a fluorescence technique to mark and re-count the invasive earthworm, Pontoscolex corethrurus from PVC tubes established in a forest and a recently abandoned pasture in Puerto Rico to test the effects of the labeling ... -
A Non-toxic Scanning Electron Microscopy Method to Study the Reproductive Structures of Agaricales Using Sample Fixation in the Field
(Caribbean Journal of Science, Vol. 41, No. 4, 857-860, 2005, 2005-12)We present a rapid and non-toxic method to prepare lamellae and related structures from Agaricales for Scanning Electron Microscopy(SEM). The morphologies of the basidia and basidiospores of Gymnopus subpruinosus, basidiospores ... -
Anoles of St. Vincent (Squamata: Polychrotidae): Population Densities and Structural Habitat Use
(Caribbean Journal of Science, Vol. 44, No. 1, 102-115, 2008, 2008-03)We examined population densities and structural microhabitat use by Anolis griseus and A.trinitatis at eight sites on the leeward (western) coast of St. Vincent, West Indies. Estimates of population density based on the ... -
Bird Community Dynamics and Habitat Associations in Karst, Mangrove and Pterocarpus Forest Fragments in an Urban Zone in Puerto Rico
(Caribbean Journal of Science, Vol. 44, No. 3, 402-416, 2008, 2008-12)Puerto Rico’s forest cover decreased to less than 10% in the early 1900’s leaving few forest patches available for migrant and resident birds. In this process of deforestation karst hills and coastal wetlands have been ... -
Changes in Ant Species Richness and Composition During Plant Secondary Succession in Puerto Rico
(Caribbean Journal of Science, Vol. 43, No. 2, 244-253, 2007, 2007-12)In general, faunal diversity increases with forest age; therefore, we predict that ant species richness in secondary forests will increase during succession and species composition will vary among different stages of ... -
Coexistence of Feral Africanized and European Honey Bees (Hymenoptera: Apoidea: Apidae) on St. Croix Island
(Caribbean Journal of Science, Vol. 44, No. 2, 264-266, 2008, 2008-07)The first evaluation of the feral population of honey bees on the island of St. Croix, US Virgin Islands is performed. Since Africanized bees had been reported in 1994, we expected that, as in the neighboring island of ... -
Comparisons of Earthworm Community Structure between an Active Pasture and an Adjacent Tropical Wet Forest in Puerto Rico
(Caribbean Journal of Science, Vol. 42, No. 3, 311-314, 2006, 2006-12)Earthworm populations have been recognized as indicators of soil fertility and health. To examine the influence of tropical land-use changes on earthworm community structure, we sampled earthworm populations in three plots ... -
Coral Reef Ecosystem Studies: Integrating Science and Management in the Caribbean
(Caribbean Journal of Science, Vol. 45, No. 2-3, 134-137, 2009, 2009) -
Coupling of humans, habitats and other species: a study of the fishers’ traditional ecological knowledge (TEK) in La Parguera
(Caribbean Journal of Science, Vol. 45, No. 2-3, 363-371, 2009, 2009)For generations, fishermen have constructed, shared, and refined knowledge (Traditional Ecological Knowledge) from their perceptions of habitats and species. Following our earlier work in La Parguera, Southwest Puerto Rico, ... -
Development of a Landforms Model for Puerto Rico and its Application for Land Cover Change Analysis
(Caribbean Journal of Science, Vol. 43, No. 2, 161-171, 2007, 2007-12)Comprehensive analysis of land morphology is essential to supporting a wide range environmental studies. We developed a landforms model that identifies eleven landform units for Puerto Rico based on parameters of land ... -
Diet of feral goats in Mona Island Reserve, Puerto Rico
(Caribbean Journal of Science, Vol. 44, No. 2, 199-205, 2008, 2008-07)The presence of feral goats can have detrimental effects to insular ecosystems where native plants have evolved in the absence of these animals. Goat diet information is valuable in determining which species may be most ... -
Differences Between Epigeic Earthworm Populations in Tank Bromeliads from Puerto Rico and Dominica
(Caribbean Journal of Science, Vol. 42, No. 3, 380-385, 2006, 2006-12)Large differences were found between the abundance, biomass and distribution of epigeic earthworms in the bromeliads of montane forests in Puerto Rico and Dominica. In Dominica they occurred in more than 90% of plants and ... -
Distribution and Relative Abundance of Humpback Whales off Western Puerto Rico during 1995-1997
(Caribbean Journal of Science, Vol. 41, No. 1, 101-107, 2005, 2005-04)Observations of humpback whales (position, number and presence of calf) were obtained from a commercial whale-watching vessel during January to March 1995 to 1997 along the northwestern coast of Puerto Rico. These data ... -
Dynamics of shelf edge coral reef-associated macroalgae at La Parguera, Puerto Rico
(2009)Percentage cover of coral reef associated algae increased significantly from 2003 to 2007 at two shelf edge sites in southwest Puerto Rico (42.8 % to 75.3% at Weinberg Reef and 67.4% to 81.8% at El Hoyo). While the increase ... -
Ecophysiology of a Mangrove Forest in Jobos Bay, Puerto Rico
(Caribbean Journal of Science, Vol. 43, No. 2, 200-219, 2007, 2007-12)We studied gas exchange, leaf dimensions, litter production, leaf and litterfall chemistry, nutrient flux to the forest floor, retranslocation rates, and nutrient use efficiency of mangroves in Jobos Bay, Puerto Rico. The ... -
Effects of a marine fishery reserve and habitat characteristics in the abundance and demography of the red hind grouper, Epinephelus guttatus
(Caribbean Journal of Science, Vol. 45, No. 2-3, 348-362, 2009, 2009)No-take marine fishery reserves have been established worldwide to reduce the impact of overfishing in marine ecosystems and to restore depleted fishery stocks. In this study we used capture-markrecapture methodology to ... -
Effects of Hurricane Georges on the Resident Avifauna of Maricao State Forest, Puerto Rico
(Caribbean Journal of Science, Vol. 42, No. 1, 81-87, 2006-04)Hurricane Georges crossed the island of Puerto Rico on 21-22 September 1998. Maricao State Forest, a montane reserve in southwestern Puerto Rico, was struck by Georges after being spared by hurricanes since 1932. I documented ... -
First Report of a Quaternary Crocodylian from a Cave Deposit in Northern Puerto Rico
(Caribbean Journal of Science, Vol. 43, No. 2, 273-277, 2007, 2007-12)The first occurrence of crocodylians from the Quaternary of mainland Puerto Rico is reported from a cave in northern Puerto Rico: this record expands the distribution of crocodylians eastward in the Caribbean region during ... -
Floods, Habitat Hydraulics and Upstream Migration of Neritina virginea (Gastropoda: Neritidae) in Northeastern Puerto Rico
(Caribbean Journal of Science, Vol. 41, No. 1, 55-74, 2005, 2005-04)Massive upstream migrations of neritid snails (Neritidae: Gastropoda) occur in tropical and subtropical streams worldwide, but their seasonality and proximate causes are unknown. We monitored massive upstream migrations ... -
Flower Phenology and Sexual Maturation: Partial Protandrous Behavior in Three Species of Orchids
(Caribbean Journal of Science, Vol. 42, No. 1, 75-80, 2006, 2006-04)Plants have theoretically multiple alternatives for preventing self pollination and consequently the effect of inbreeding, such as sequential flowering, dichogamy and self–incompatibility to name a few. We investigated the ...