Zeolite and prehnite-pumpellyite facies in south central Puerto Rico

1970 ◽  
Vol 27 (3) ◽  
pp. 204-224 ◽  
Author(s):  
Wayne T. Jolly
Keyword(s):  
Puerto Rico ◽  
South Central

scholarly journals First Report of Squash vein yellowing virus Affecting Watermelon and Bitter Gourd in Puerto Rico

Plant Disease ◽  
2013 ◽  
Vol 97 (11) ◽  
pp. 1516-1516 ◽  
Author(s):  
V. Acevedo ◽  
J. C. V. Rodrigues ◽  
C. E. de Jensen ◽  
C. G. Webster ◽  
S. Adkins ◽  
...  
Keyword(s):  
Puerto Rico ◽  
Fungal Pathogens ◽  
Citrullus Lanatus ◽  
Direct Sequencing ◽  
Bitter Gourd ◽  
Growth Stages ◽  
Mechanical Inoculation ◽  
First Report ◽  
South Central ◽  
Yellowing Virus

In 2005, symptoms of watermelon vine decline (WVD) were observed on a 200-acre watermelon farm in Santa Isabel, on the south central coast of Puerto Rico. WVD symptoms included leaf curling, mosaics, and internode necrosis. In early growth stages of WVD, reduced vigor and plant stunting occurred. At flowering, symptoms progressed to necrosis and wilting of vines. A 2006 to 2007 survey demonstrated that fungal pathogens were not associated with the presence of WVD symptoms (3,4). By 2006, other watermelon fields were also affected. Field trials in 2007 and 2008 with insect-proof cages and insecticides suggested a role of whiteflies (Bemisia tabaci) in the transmission of a virus (3,4). Here, we report that watermelon and pumpkin plants were successfully infected in Puerto Rico by mechanical inoculation and through B. tabaci transmission assays, similarly to transmissions previously conducted in Florida with Squash vein yellowing virus (SqVYV) (1). In addition, plants of Cucurbita moschata exhibited vein clearing symptoms typical of SqVYV after mechanical inoculation with extracts from watermelon plants with WVD symptoms. In 2011, eight watermelon samples from plants exhibiting WVD syndrome were collected in Guánica, Santa Isabel, Juana Díaz, and Mayagüez, and two Momordica charantia samples were collected from Mayagüez. RNA was extracted from all 10 original samples, as well as from plants that were used in mechanical and vector transmission assays, using RNeasy Plant Mini Kit (Qiagen, Valencia, California), and all samples were found positive for SqVYV by reverse transcription-PCR, using previously described primers and methods (1,2). In all cases, a single ~1-kb PCR fragment was revealed, and PCR fragments from four samples were selected for direct sequencing. All sequences showed high levels (>99%) of nucleotide identity with SqVYV sequences from Florida (JF897989, JF897985, and JF897984). Sequences of the SqVYV CP gene from Puerto Rico were deposited in GenBank under accession numbers KC713961 to KC713964. To our knowledge, this is the first report of SqVYV in Puerto Rico associated with WVD syndrome in cucurbits, and thus has implications for management of viral diseases of watermelon in the Caribbean. This is also the first detection of SqVYV outside of the continental United States in both watermelon and a wild species, M. charantia (bitter gourd). References: (1) S. Adkins et al. Phytopathology 97:145, 2007. (2) S. Adkins et al. Plant Dis. 92:1119, 2008. (3) C. Estévez de Jensen et al. Phytopathology 98:S52, 2008. (4) L. Polanco-Florián. El marchitamiento súbito de la sandía [Citrullus lanatus (Thumb.) Matsum & Nakai]. M.S. thesis, University of Puerto Rico, Mayagüez, PR, 2009.

scholarly journals Phosphorus status of soils from the poultry zone in Puerto Rico

1969 ◽  
Vol 83 (1-2) ◽  
pp. 1-17
Author(s):  
Gustavo A. Martínez ◽  
Luis Olivieri ◽  
José A. Castro ◽  
Oscar Muñiz-Torres ◽  
José L. Guzmán
Keyword(s):  
Puerto Rico ◽  
Management Practices ◽  
Poultry Production ◽  
Surrounding Water ◽  
Nutrient Runoff ◽  
Bird Populations ◽  
South Central ◽  
Environmentally Sound ◽  
Sound Management ◽  
The Impact

The poultry industry is the economic backbone of the south central region of Puerto Rico. However, as in other poultry production regions in the U.S., concern has risen regarding its potentially damaging impact on the environment. Eutrophication of rivers and lakes, induced by excessive nutrient runoff, has forced regulatory agencies to closely evaluate manure disposal practices. Thus, the need is critical for environmentally sound management practices in poultry producing areas. The impact of years of manure applications on the nutritional status of soils was ascertained by evaluating a number of samples from nine poultry farms of Puerto Rico. The farms were selected among those with the highest bird populations. Sixty-seven percent of the samples analyzed contained phosphorus levels (Olsen) in excess of what is considered adequate to support crop growth. Fifty-six percent of these exceeded levels considered by some states as critical for water quality purposes. Measured levels ranged from undetectable values up to 900 mg/kg P.  A diagnostic tool known as the P index was used in an effort to identify areas of concern. According to this criterion, all farms studied had zones where nutrient runoff could threaten the quality of the surrounding water bodies.

scholarly journals First record of the cleptoparasitic bee genus Sphecodes from Puerto Rico (Hymenoptera: Halictidae)

2014 ◽  
pp. 1
Author(s):  
Michael S. Engel ◽  
Sara G. Prado
Keyword(s):  
Puerto Rico ◽  
Natural History ◽  
First Record ◽  
Future Directions ◽  
South Central ◽  
Males And Females ◽  
First Time

The cleptoparasitic bee genus Sphecodes Latreille (Halictinae: Halictini) is recorded from Puerto Rico for the first time.  Sphecodes (Austrosphecodes) tainoi Engel was previously known from western Cuba but is here recorded from a series of males and females captured in south-central, central, and western Puerto Rico.  Images of the species are provided along with brief remarks on observed variations and possible future directions of study into their natural history.

scholarly journals Diagenesis of Hydrocarbon-bearing Concretions in South-central Puerto-rico: Tectonism and Early hydrocarbon Generation

2021 ◽  
Author(s):  
ting ding ◽  
Luis A. González ◽  
Fu sheng Guo ◽  
Yang Xu
Keyword(s):  
Puerto Rico ◽  
Geothermal Gradient ◽  
Hydrocarbon Generation ◽  
Sulfate Reducing ◽  
Carbonate Cements ◽  
South Central ◽  
Fracture Formation ◽  
The Matrix ◽  
Pyrite Formation ◽  
Reducing Environment

Abstract Carbonate concretions within tuffaceous mudstones in the Upper Cretaceous Cariblanco Formation of south-central Puerto Rico that contain solid and liquid hydrocarbons were affected by: 1) Three distinct events of vein/fracture formation accompanied or followed by sediment infilling; 2) pyrite formation throughout the concretion matrix, in foraminiferal chambers, and sediment vein fills; 3) four events of larger vein and fracture formation infilled by distinct calcite cements that postdate sediment infilled veins; 4) a late quartz void filling cement; and 5) formation of calcite-filled veinlets that crosscut all components. Petrographic and isotopic data suggest early concretion formation and septarian vein fills, close to the sediment-water interface, prior to any significant dewatering of infilling sediments. The δ13C values of the matrix and sediment infills (-15 to -30‰ PDB), their brightly luminescent character, and the sequestering of Fe into pyrite indicate formation in a sulfate-reducing environment with influx of diffusing methane. Fluid inclusion data, isotopic composition of carbonate cements (13C enrichments from − 18 to -8‰ and 18O depletion from − 4 to -12‰), and organic matter maturation suggest maximum burial temperatures of 150 to 200°C. Calcite cements and microspars were formed by the circulation of progressively warmer fluids, with warming induced by the gradual emplacement of the nearby Los Panes intrusion. The intrusion probably caused intense normal faulting, induced extensive warm fluid circulation, and resulted in a high geothermal gradient responsible for early hydrocarbon generation.

Regional hydrocarbon potential of the northeastern Caribbean based on integration of sediment thickness and source rock maturity data

2020 ◽  
pp. SP504-2019-244 ◽  
Author(s):  
Travis Tillman ◽  
Paul Mann
Keyword(s):  
Puerto Rico ◽  
Source Rocks ◽  
North Coast ◽  
San Juan ◽  
Past Century ◽  
Central Basin ◽  
Sediment Thickness ◽  
South Central ◽  
Potential Source ◽  
Plateau Central

AbstractOver 72 exploration wells have been drilled on the Caribbean islands of Hispaniola and Puerto Rico over the past century, but with no commercial success. A question is whether these Caribbean oceanic islands have experienced sufficient subsidence and burial for any potential source rocks to reach maturity and produce commercial hydrocarbons. Subsurface data from previous studies were compiled into a regional depth to basement and sediment thickness map for Hispaniola, Puerto Rico and their offshore areas. The thickest basins include the Enriquillo/Cul-de-Sac basin (6.3 km), San Juan/Plateau Central basin (5 km), Azua basin (2.8 km), Cibao basin (5 km), North Coast basin (2.5 km), South Coast basin (1.3 km), Haiti sub-basin (3.7 km), Hispaniola basin (3.5 km) and San Pedro basin (3 km). One-dimensional modelling for six onland basins shows that only the Azua basin of the south-central Dominican Republic has reached sufficient maturity to place potential source rocks into the oil window. Our study shows that commercial hydrocarbons are possible in the deeper basins – Azua basin, San Juan–Plateau Central basin and Cibao basin of Hispaniola – but unlikely in the shallower basins that lack sufficient overburden for organic maturity.

The Ball-court Petroglyph Boulders at Jacaná, South-central Puerto Rico

2010 ◽  
Vol 20 (3) ◽  
pp. 323-344 ◽  
Author(s):  
Johannes Loubser
Keyword(s):  
Puerto Rico ◽  
Field Observations ◽  
South Central

Detailed information gleaned from the approximately 800-year-old proto-Taíno petroglyph boulders at the Jacaná ball-court in south-central Puerto Rico highlights their research potential, particularly when based on detailed field observations and placed within an ethno-historic context.

Sign in / Sign up

Export Citation Format

Share Document