abstract：:Population structure and environmental relationships of the tropical tree Nectandra rudis (Lauraceae), a rare species in western Mexico. The tree N. rudis is a rare species from western Mexico of which community and population features are unknown. We studied a population in an altitudinal gradient, from 550-1,850 m a...

journal_title：Revista de biologia tropical

authors： Guzmán RC,Moya EG,García JA,López NM

更新日期：2008-03-01 00:00:00

abstract：:The aquatic gastropod mollusc, Pyrgophorus coronatus, may perform an important role in the transmission of an emergent ocular pathology among fishes in Lake Apoyo, Nicaragua. This disease emerged after an introduction of tilapia (Oreochromis niloticus) and the subsequent loss of Chara sp. beds in the lake. We compared...

journal_title：Revista de biologia tropical

authors： McCrary JK,Madsen H,González L,Luna I,López LJ

更新日期：2008-03-01 00:00:00

abstract：:Fish are important ecological components in tropical coastal lagoons. In order to evaluate the distribution and feeding preferences of the toadfish Opsanus phobetron in the Chelem Lagoon, Yucatan, Mexico, fish samples were collected using a beach seine in eight stations distributed randomly, from March 2002 to January...

journal_title：Revista de biologia tropical

authors： Canto-Maza WG,Vega-Cendejas ME

更新日期：2007-09-01 00:00:00

abstract：:The karyotypes of the purple snails Plicopurpura pansa (Gould, 1853) and P. columellaris (Lamarck, 1816) were established from 17 and 13 adults, respectively; and from eight capsules with embryos of P. pansa. In P. pansa were counted 59 mitotic fields in the adults and 127 in embryos; and 118 fields in P columellaris....

journal_title：Revista de biologia tropical

authors： Arias-Rodriguez L,González-Hermoso JP,Fletes-Regalado H,Rodriguez-Ibarra LE,Del Valle Pignataro G

更新日期：2007-09-01 00:00:00

abstract：:The study presents an interactive descriptive tool (MONRATE) for calculating and predicting reinfection rates and time of Ascaris lumbricoides following mass chemotherapy. The implementation was based on the theoretical equation published by Hayashi in 1977, for time-prevalence: Y=G [1-(1-X)(N-R)] as modified by Jong-...

journal_title：Revista de biologia tropical

authors： Sam-Wobo SO,Mafiana CF,Onashoga SA,Vincent OR

更新日期：2007-09-01 00:00:00

abstract：:Cattleya trianae is an endemic species from the tropical rainforest in the Colombian Andes. Its survival is currently threatened due to habitat loss and commercial overexploitation. This study evaluates ten substrates, some organic (pine bark, coconut fiber and wood shavings), some inert icopor (polystyrene foam), veg...

journal_title：Revista de biologia tropical

authors： Franco M,Guevara G,Mesa N,Urueña G

更新日期：2007-06-01 00:00:00

abstract：:We analyzed the diet and feeding habits of the fishes Heterandria bimaculata and Poecilia sphenops. Specimens were captured monthly in "Los Carros" damp, Morelos, Mexico (18 degrees 37' N, 98 degrees 43' W). We quantified gut content by the numerical method and by the frequency of occurrence method; and used the MacAr...

journal_title：Revista de biologia tropical

authors： Trujillo-Jiménez P,Beto HT

更新日期：2007-06-01 00:00:00

abstract：:The genus Histioneis (=Parahistioneis) contains an excessive number of poorly described species, often based on the observation of a single specimen and ignoring the intraspecific variability. In order to investigate the validity of the species and to suggest synonyms, the original illustrations of all known species o...

journal_title：Revista de biologia tropical

authors： Gómez F

更新日期：2007-06-01 00:00:00

abstract：:The arguments presented by Espinoza et al. in their paper "Relationship of genetically modified crops with the environment and health of the Costa Rican human population" published in this journal (Rev. Biol. Trop. 52: 727-732, 2004) are questioned and refuted. The arguments are confronted with evidence offered by sci...

journal_title：Revista de biologia tropical

authors： García JE

更新日期：2007-06-01 00:00:00

abstract：:Capturing small carnivores is often necessary for obtaining key ecological data. We compared the efficiency of box and leg-hold traps, using live and dead bait, to capture six carnivore species (Herpailurus yagouaroundi (E. Geoffroyi, 1803), Leopardus tigrinus (Schreber, 1775), Nasua nasua (Linnaeus, 1766), Cerdocyon ...

journal_title：Revista de biologia tropical

authors： Michalski F,Crawshaw PG Jr,Oliveira TG,Fabián ME

更新日期：2007-03-01 00:00:00

abstract：:The land crab Gecarcinus quadratus is an engineering species that controls nutrient cycling in tropical forests. Factors regulating their coastal distribution are not fully understood. We quantified land crab distribution during the dry season at Sirena Field Station in Corcovado National Park, Costa Rica, and found t...

journal_title：Revista de biologia tropical

authors： Griffiths ME,Mohammad BA,Vega A

更新日期：2007-03-01 00:00:00

abstract：:Isolation of a field strain of Babesia bigemina (Piroplasma: Babesiidae) and establishment of in vitro culture for antigen production. Bovine b abesiosis, caused by Babesia bigemina, is a barrier for livestock development; it results in high economic loss to Mexican livestock. Control requires adequate antigens for di...

journal_title：Revista de biologia tropical

authors： Rodríguez-Vivas RI,Quiñones-Avila FJ,Ramírez-Cruz GT,Cruz D,Wagner G

更新日期：2007-03-01 00:00:00

abstract：:We registered seedling survival and biomass increase for Rhizophora mangle L., Avicennia germinans L. and Laguncularia racemosa (L.) Gaertn. f, main mangrove species in the Rancheria River delta, Colombia. Only seedlings of R. mangle were found to survive. We also measured maximum rate of litterfall. We estimated annu...

journal_title：Revista de biologia tropical

authors： Lema Vélez LF,Polanía J

更新日期：2007-03-01 00:00:00

abstract：:The diet ofa neotropical fish species (Creagrutus bolivari) was studied using different methods: the Cortés 1997 graphic method and two relative importance indexes, one designed by George and Hadley in 1979 (% RIi) and another proposed by Cortés in 1997 (% IRIi). Only discrete prey (aquatic and terrestrial invertebrat...

journal_title：Revista de biologia tropical

authors： Ortaz M,von Bach PB,Candia R

更新日期：2006-12-01 00:00:00

abstract：:The breeding success of a double-brooding colony of Boat-billed Herons Cochlearius cochlearius was studied in pasturelands of Costa Rica. Mean clutch size in the first clutches (2.9 eggs/nest) was higher than in second and repeat clutches (2.3 eggs/nest). Breeding success was similar in the first attempt and second at...

journal_title：Revista de biologia tropical

authors： Gómez J,Gil-Delgado JA,Monrós JS

更新日期：2006-12-01 00:00:00

abstract：:A four year study was conducted on a natural population of immature stages of Aedes aegypti after the re-invasion of Argentina by this vector in 1987. Thirty six plastic containers with 700 ml of dechlorinated water were placed in the La Plata Zoological Garden, La Plata, Argentina. A strip of filter paper around each...

journal_title：Revista de biologia tropical

authors： Micieli MV,García JJ,Achinelly MF,Martí GA

更新日期：2006-09-01 00:00:00

abstract：:Bothrops cotiara is a venomous snake sporadically found in the province of Misiones in Argentina, South of Brazil and Paraguay. Data on the clinics of the envenomation produced by its bite and on its venom are scarce. There is no information on the neutralizing capacity of the antivenoms available. In this study, the ...

journal_title：Revista de biologia tropical

authors： de Roodt AR,Estévez J,Dolab JA,Manzanelli MV,Piñeiro N,Paniagua JF,Vogt AU

更新日期：2006-09-01 00:00:00

abstract：:Most laboratory assessments of toxicity and bioaccumulation of heavy metals have been concentrated on the accumulation of these metal ions when exposed singly to the test organisms. However, under the natural environmental settings, the metals are never present in isolation and may interact with each other, therefore ...

journal_title：Revista de biologia tropical

authors： Otitoloju AA,Don-Pedro KN

更新日期：2006-09-01 00:00:00

abstract：:The analysis of integumental pore pattern has identified two intraspecific groups of postlarval shrimp Litopenaeus vannamei (Boone, 1931), a species of which three to five natural populations or groups are expected to be found from Mexico to Peru. Natural distribution and man-made redistributions have not been typifie...

journal_title：Revista de biologia tropical

authors： Cabrera-Jiménez JA

更新日期：2006-09-01 00:00:00

abstract：:We observed the mating behavior of the neck-banded snake Scaphiodontophis annulatus (a common species of colubrid in the South Pacific of Costa Rica) in the pre-montane wet forest of Las Cruces Biological Station (San Vito de Java, Costa Rica). Three S. annulatus were observed during courtship between 10-12 AM in a pa...

journal_title：Revista de biologia tropical

authors： Sasa M,Curtis S

更新日期：2006-06-01 00:00:00

abstract：:A new genus and two species of Melolonthinae from Honduras and Nicaragua are described. A phylogenetic analysis, carried out using morphological characters, suggests that Catrachia is a strongly supported monophyletic group. Catrachia is therefore established as a new genus, constituted by two new species, Catrachia m...

journal_title：Revista de biologia tropical

authors： Coca-Abia MM,Robbins PS

更新日期：2006-06-01 00:00:00

abstract：:We studied seed germination and seedling growth of the Mexican sunflower Tithonia diversifolia in Nigeria. This involved the usage of some dormancy-releasing methods and the effect of some concentrations of three herbicide formulations on the young seedlings. Initial germination tests on fresh and stored seeds reveale...

journal_title：Revista de biologia tropical

authors： Agboola DA,Idowu WF,Kadiri M

更新日期：2006-06-01 00:00:00

abstract：:The spatial and temporal abundance of epiphytic dinoflagellates associated with ciguatera was studied over two annual cycles (March 1999 to March 2000 and March 2001 to March 2002) in the northwestern coast of Cuba. From 14 species of macroalgae (Phaeophyta, Chlorophyta, and Rhodophyta), 1340 samples were obtained ide...

journal_title：Revista de biologia tropical

authors： Delgado G,Lechuga-Devéze CH,Popowski G,Troccoli L,Salinas CA

更新日期：2006-06-01 00:00:00

abstract：:Although Costa Rica has been biologically well studied, few areas have complete mammal inventories, which are essential for ecological studies and conservation. The San Vito region is considered among the most important for scientific research in the country because of the presence of the Wilson Botanical Garden and L...

journal_title：Revista de biologia tropical

authors： Pacheco J,Ceballos G,Daily GC,Ehrlich PR,Suzán G,Rodríguez-Herrera B,Marcé E

更新日期：2006-03-01 00:00:00

abstract：:Coral reef status was surveyed in three south Pacific coral reefs of Costa Rica, one in Caño Island and two in Golfo Dulce, and the density, richness and distribution of non-colonial macro borers (> 1 mm) was determined in dead and live coral fragments from these reefs. Based upon traditional indicators of degradation...

journal_title：Revista de biologia tropical

authors： Fonseca AC,Dean HK,Cortés J

更新日期：2006-03-01 00:00:00

abstract：:Costa Rican natural ecosystems are among the most diverse in the world. For this reason, we isolated strains of the entomopathogenic bacteria Bacillus thuringiensis (Bt) to determine their diversity, distribution and abundance. A total of 146 Bt strains were obtained from environmental samples collected from diverse n...

journal_title：Revista de biologia tropical

authors： Arrieta G,Espinoza AM

更新日期：2006-03-01 00:00:00

abstract：:We summarize information concerning Recent and Pleistocene-Holocene Uruguayan sand dollars (Mellitidae), as well as Miocene taxa (Monophorasteridae). Recent and Pleistocene-Holocene species (Encope emarginata, Mellita quinquiesperforata, and Leodia sexisperforata) are at their southernmost limits of distribution, with...

journal_title：Revista de biologia tropical

authors： Martínez S,Mooi R

更新日期：2005-12-01 00:00:00

abstract：:The sea urchin Lytechinus variegatus is of some commercial importance on the Southern coast of Margarita Island (Venezuela), where artisan women fishers process and sell the roe. The reproduction cycle of this species had not been fully studied. We collected these sea urchins in two stations from November 1997 through...

journal_title：Revista de biologia tropical

authors： Montealegre Quijano S,Gómez Gaspar A

更新日期：2005-12-01 00:00:00

abstract：:A systematic list of the echinoderms of the Gulf of California, based on museum specimens of the Colección Nacional de Equinodermos, Instituto de Ciencias del Mar y Limnologia, Universidad Nacional Autónoma de México and the National Museum of Natural History, Smithsonian Institution, Washington, D.C. is presented. A ...

journal_title：Revista de biologia tropical

authors： Solís-Marín FA,Laguarda-Figueras A,Durán-González A,Ahearn CG,Torres Vega J

更新日期：2005-12-01 00:00:00

abstract：:The reproductive season of tilapia was studied by monthly samplings at Emiliano Zapata dam, Morelos State, Mexico. From February 1999 through February 2000 a sample of 50 fish was taken from the commercial catch (castnet, 6.5 cm of mesh size). The observed sex ratio was 1:1.29 (females:males) (chi(2)=10.26; p<0.05). T...

journal_title：Revista de biologia tropical

authors： Peña-Mendoza B,Gómez-Márquez JL,Salgado-Ugarte IH,Ramirez-Noguera D

更新日期：2005-09-01 00:00:00

abstract：:The diversity, composition and structure of vegetation in a cattle landscape in Matiguás, Nicaragua was characterized, and the floristic and structural differences of six types of habitats (secondary forests, riparian forests, charrales, live fences and pastures with high and low tree cover) were compared. A total of ...

journal_title：Revista de biologia tropical

authors： Merlos DS,Harvey CA,Grijalva A,Medina A,Vílchez S,Hernández B

更新日期：2005-09-01 00:00:00

abstract：:The mangrove forest that fringes the Bon Accord Lagoon measures 0.8 km(2) and is dominated by red mangrove (Rhizophora mangle). This forest forms the landward boundary of the Buccoo Reef Marine Park in Southwest Tobago, and is part of a mangrove-seagrass-coral reef continuum. Biomass and productivity, as indicated by ...

journal_title：Revista de biologia tropical

authors： Juman RA

更新日期：2005-05-01 00:00:00

abstract：:Maintaining regional competitiveness and economic viability for Port Bustamante - Kingston Harbour, Jamaica, required improved accessibility to "Post Panamax" (too large to pass through the Panama Canal) container vessels. Removal of the northern portion of the shallow coral reef at Rackham's Cay, which was partially ...

journal_title：Revista de biologia tropical

authors： Gayle PM,Wilson-Kelly P,Green S

更新日期：2005-05-01 00:00:00

abstract：:The Godineau (South Oropuche) Swamp (3171 ha) on the southwestern coast of Trinidad (10 degrees l315'N, 61degrees 30-32'W) is heavily impacted by anthropogenic activities including fishing, oil exploration, drainage manipulation and wetland clearance. To reduce the negative effects of these activities and to manage th...

journal_title：Revista de biologia tropical

authors： Ramsundar H

更新日期：2005-05-01 00:00:00

abstract：:We examined the protoplasmic assimilation of columnar cacti pollen grains in two species of Venezuelan desert glosophagine bats, Glossophaga longirostris and Leptonycteris curasoae, by determining the amount of empty (digested) pollen grains found in their fecal samples. To determine the amount of empty pollen grains,...

journal_title：Revista de biologia tropical

authors： Muñoz-Romo M,Sosa M,Quintero YC

更新日期：2005-03-01 00:00:00

abstract：:The nests used in this study were obtained from trap-nests (tubes of cardboard and cut bamboo stems) placed on Santa Carlota Farm (Itaoca Section-IS, Santana Section-SS and Cerrado-Ce), Cajuru, SP, Brazil. The number of nests and corresponding species obtained were as follows: 516 nests of T. curvitarsis, 104 of T. ru...

journal_title：Revista de biologia tropical

authors： Camillo E

更新日期：2005-03-01 00:00:00

abstract：:We indirectly evaluated the selective pressures on dispersal and establishment of Campsiandra angustifolia, a common water-dispersed tree from the Peruvian Amazon, analyzing the variation in the relationship between the volume occupied by dispersal and establishment structures in a total of 535 seeds from 13 trees loc...

journal_title：Revista de biologia tropical

authors： Farji-Brener AG,Durán S,Valerio A,Herbas E,Castañeda M,Ochoa J,Romo M

更新日期：2005-03-01 00:00:00

abstract：:Nutrients and chlorophylls concentrations, as well as salinity, temperature and Secchi disk depth were determined from November 1999 to April 2000, at three stations and two depths, at Gandoca lagoon, Gandoca-Manzanillo National Wildlife Refuge, Limón, Costa Rica. Salinity profiles indicated that the lagoon was a salt...

journal_title：Revista de biologia tropical

authors： Coll M,Cortés J,Sauma D

更新日期：2004-12-01 00:00:00

abstract：:The striped marlin (Tetrapturus audax) is found in temperate and tropical waters of the Pacific and Indian Ocean. It is particularly abundant in the southern tip of the Baja California peninsula. Specimens brought to Cabo San Lucas port (22 degrees 53' N y 109 degrees 54' W) by the sport fishery fleet that operates wi...

journal_title：Revista de biologia tropical

authors： Barrera FN,Uraga RF

更新日期：2004-12-01 00:00:00

abstract：:Centrostephanus coronatus reaches a density of 0.06 individuals/m2 in shallow reef waters in Parque Nacional Marino Ballena, Pacific of Costa Rica, in the same habitat occupied by the urchin Diadema mexicanum. It is the fourth species of diadematoid urchins reported for Costa Rican and a first new report for Central A...

journal_title：Revista de biologia tropical

authors： Alvarado JJ

更新日期：2004-12-01 00:00:00