Jorge Barrios - Academia.edu (original) (raw)
Papers by Jorge Barrios
Journal of Computational and Applied Mathematics, 2016
Revista De Biologia Tropical, Dec 1, 2000
The associated fauna of Gracilariopsis tenuifrons (Gracilariaceae, Rhodophyta) cultures was colle... more The associated fauna of Gracilariopsis tenuifrons (Gracilariaceae, Rhodophyta) cultures was collected between October 1994 and December 1996 in Chacopata (Sucre State, Venezuela) and preserved in 10% formaldehyde. The species list includes 17 Crustacea, 14 Mollusca and six Polychaeta, the remaining taxa added ten species (total 47 species in eight Phyla). Grazing by mesoherbivores affected the algae and the mollusk Aplysia protea damaged new cultures significantly. The abundance of tubes built by the amphipod Euricthonius brasiliensis impairs algal aspect and facilitates colonization by other organisms.
Revista De La Facultad De Agronomia De La Universidad Del Zulia, 2007
Boletín del Instituto Oceanográfico de Venezuela, 2003
... JORGE E. BARRIOS, BRIGHTDOOM MÁRQUEZ & MAYRÉ JIMÉNEZ RESUMEN: Las raíces del mangle r... more ... JORGE E. BARRIOS, BRIGHTDOOM MÁRQUEZ & MAYRÉ JIMÉNEZ RESUMEN: Las raíces del mangle rojo Rhizophora mangle, presentan una comunidad biológica compuesta por numerosos organismos. Se estudiaron las macroalgas asociadas a raíces de R. mangle en ...
Boletín del Instituto Oceanográfico de Venezuela, 1995
Acta Biologica Venezuelica, Jun 9, 2021
Acta Biologica Venezuelica, Jun 9, 2021
La costa venezolana posee amplias extensiones con sectores arenosos y areno-fangosos en los que s... more La costa venezolana posee amplias extensiones con sectores arenosos y areno-fangosos en los que se desarrollan algunas plantas marinas sumergidas, conocidas como “Pastos Marinos” debido a su apariencia similar al de Gramíneas. Este trabajo es parte de la revisión de herbarios y literatura disponible desde 1978 hasta el presente, y el monitoreo de estas plantas en los primeros 10 m de profundidad. En estos se han descrito hasta el momento 5 géneros y 9 especies, de las cuales Thalassia testudinum König, Halophila baillonis Ascherson, Halophila decipiens Ostenfeld y Halophila stipulacea (Forsskal) Ascherson se encuentran incluidas en la Familia Hydrocharitaceae. Esta última es una especie introducida, que debe ser revisada y permanentemente monitoreada. Halodule beaudetteii Den Hartog, Halodule wrightii Ascherson y Syringodium filiforme Kützing dentro de la familia Cymodoceae; Ruppia maritima L. y Ruppia didyma Sw. ex Wiks en la familia Ruppiaceae, son las especies conocidas hasta el presente. Sin embargo, muchas de estas especies deben continuar estudiándose, debido a que crecen por debajo de los 10 m y aún quedan numerosas localidades por explorar, principalmente en el área insular. Este trabajo puede complementarse con un rastreo y colección en conjunto con la Federación de Buceo en Venezuela. FVBV para ampliar el conocimiento de la distribución de estas plantas. 
Revista De Biologia Tropical, 2016
Several species of sea urchins are a potential resource for the production of gonads for consumpt... more Several species of sea urchins are a potential resource for the production of gonads for consumption in Venezuela. We studied the gametogenic cycle and the gonadosomatic index (GSI) of the rock boring urchin Echinometra lucunter between June 2010 and November 2011 in northeastern Venezuela (Isla Lobos, Peninsula de Araya and Turpialito, Gulf of Cariaco). The gonads are composed of long ramified acini, covered by connective tissue, followed by a thin layer of cells that differentiate into nutritive phagocytes and gametes, which change in their proportion and size with the maturity stage. Generally, several maturity stages were observed in both locations, showing simultaneous spawning. At Isla de Lobos the individuals in reserve stage predominated with a short period of sexual maturity, while mature and spawned individuals predominated in Turpialito. The GSI suggests that the greatest spawning activity is associated to the rainy season; showing a conservative reproductive activity, ac...
Boletin Del Instituto Oceanografico De Venezuela, 2009
Se presenta una sinopsis historica y un catalogo actualizado de las macroalgas del golfo de Caria... more Se presenta una sinopsis historica y un catalogo actualizado de las macroalgas del golfo de Cariaco (estado Sucre, Venezuela) en base a la bibliografia disponible hasta la fecha. Se encontraron un total de 108 especies de macroalgas: 46 Rhodophyta (42,6 %), 32 Ochrophyta (29,6%) y 30 Chlorophyta (27,8%). Se revisaron en total 16 publicaciones que citan macroalgas colectadas en el golfo de Cariaco. La mayor parte de los trabajos incluidos en este estudio tiene mas de 30 anos, porlo que se recomienda realizar un nuevo inventario de las macroalgas del golfo de Cariaco. Palabras clave: Inventario, macroalgas, golfo de Cariaco. ABSTRACT: A historical synopsis and an updated database of Gulf of Cariaco macroalgae are presented based on the bibliography available up to date. One hundred and eight species of macroalgae are depicted: 46 Rhodophyta (42.6%), 32 Ochrophyta (29.6%), and 30 Chlorophyta (27.8%). The review encompasses 16 publications recording algae collected in thegulf. Most of the works included in this study were written over 30 years ago; a new annotated account of the Gulf of Cariaco macroalgae is imperative. Key words: Check list, macroalgae, Cariaco’s gulf.
Boletín del Centro de Investigaciones …, 2009
AquaTechnica: Revista Iberoamericana de Acuicultura., 2020
Se realizó un estudio fitoquímico y de bioactividad a los extractos en cloroformo, a... more Se realizó un estudio fitoquímico y de bioactividad a los extractos en cloroformo, acetato de etilo y metanol del alga Kappaphycus alvarezii Doty (recolectada en la Isla de Cubagua, Venezuela). Los valores de CL50 en el bioensayo realizado con todos los extractos obtenidos, mostraron toxicidad ante larvas del crustáceo Artemia salina (CL50
Boletin Del Instituto Oceanografico De Venezuela, 2009
Griffithsia caribaea FELDMANN (Ceramiaceae, Rhodophyta) is reported for the first time in the Ven... more Griffithsia caribaea FELDMANN (Ceramiaceae, Rhodophyta) is reported for the first time in the Venezuelan coasts, collected in Cabo San Román, Falcón state. This species is characterized for presenting a small thallus with cylindrical, sub-cilindrical and clavate cells and an involucral crown composed by eight cells in esporophytic phase. This constituted the third specie record of the genus Griffithsia for Venezuelan.
Revista De Biologia Tropical, 2015
Echinometra lucunter is relatively abundant in the Venezuela coast, however no details are known ... more Echinometra lucunter is relatively abundant in the Venezuela coast, however no details are known about its diet. We compare the stomach contents and repletion index of E. lucunter with macroalgae available in their environment (June 2010-August) and the nutrient cycle at the Golfo de Cariaco. Seventy-one species of macroalgae were identified: Rhodophyta (45), Heterokontophyta (11) and Chlorophyta (15). The mean testa diameter was 41.04 ± 6.60 mm. The food preferences included filamentous, siphonal and calcaeous macroalgae; main food items were the filamentous macroalgae Sphacelaria sp. and Herposiphonia sp., and foliose Dictyota sp., including invertebrates such as sponges, bivalves and barnacle crustaceans. The repletion index was 0.8 - 6.0 % (2.6 ± 1.21 %), maximum values were associated to primary productivity cycle, i.e. December 2010 (6.0 ± 2.21 %), April (4.3 ± 0.34 %), June 2011 (4.0 ± 1.79 %). Food preferences could be associated to the upwelling season and productivity cycle.
Revista de Biología Tropical, 2000
The associated fauna of Gracilariopsis tenuifrons (Gracilariaceae, Rhodophyta) cultures was colle... more The associated fauna of Gracilariopsis tenuifrons (Gracilariaceae, Rhodophyta) cultures was collected between october 1994 and december 1996 in Chacopata (Sucre State, Venezuela) and preserved in 10% formaldehyde. The species list includes 17 Crustacea, 14 Mollusca and 6 Polychaeta, the remaining taxa added 10 species (total 47 species in eight Phyla). Grazing by mesoherbivores affected the algae and the mollusk Aplysia protea damaged new cultures significantly. The abundance of tubes built by the amphipod Eurirthonius brasiliensis impairs algal aspect and facilitates colonization by other organisms.
Fontus, 1999
En la costa norte de Araya, Estado Sucre (Venezuela), de han establecido recientemente cultivos p... more En la costa norte de Araya, Estado Sucre (Venezuela), de han establecido recientemente cultivos piloto de E. denticulatum y K. alvarezii con el fin de extender su cultivo y exportar materia prima para la industria procesadora de algas. A pesar de que los cultivos de
estos géneros representan nuevas fuentes de ingreso para muchos países, provocan numerosos impactos negativos en la biodiversidad, y en el caso de Venezuela, se incrementa el peligro de daños en los ecosistemas marinos por tratarse de especies con características invasivas provenientes de provincias biogeográficas ajenas al Mar Caribe, por lo que se presenta en este trabajo una revisión crítica de los riesgos de introducir las algas exóticas E. denticulatum y K. alvarezii en nuestro país.
Boletín del Instituto Oceanográfico de Venezuela, 2021
The non-native red alga Kappaphycus alvarezii introduced for mariculture has spread and impacts t... more The non-native red alga Kappaphycus alvarezii introduced for mariculture has spread and impacts the hydrocoral reef Millepora alcicornis in Cubagua island, Venezuela. Biodiversity and coral cover were compared in two reefs (invaded and clean) using statistical and ecological tests. Photoquadrats were obtained in 6 transects in each reef in march and april 2009 and estimated the biota cover using the Image-J program. Were identified 25 benthic animals, 81 macroalgae and the seagrass Thallasia testudinum. The alga K. alvarezzi grew on M. alcicornis forming compact thalli attached to the coral, destroyed them by shadowing and smothering effects. Grazing by herbivores is evident in invasive algae. Statistical tests showed significant differences between the reefs studied. The native algae Caulerpa chemnitzia, present at both sites, increased its covering on the reef affected by the exotic algae, showing an inverse relationship between the cover of these algae and the coral cover. A synergistic relationship was determined between both species of macroalgae to the detriment of the coral reef. The invasion of corals by K. alvarezzi can lead to a phase of change that modifies the structure of the reef or causes its disappearance
Journal of Computational and Applied Mathematics, 2016
Revista De Biologia Tropical, Dec 1, 2000
The associated fauna of Gracilariopsis tenuifrons (Gracilariaceae, Rhodophyta) cultures was colle... more The associated fauna of Gracilariopsis tenuifrons (Gracilariaceae, Rhodophyta) cultures was collected between October 1994 and December 1996 in Chacopata (Sucre State, Venezuela) and preserved in 10% formaldehyde. The species list includes 17 Crustacea, 14 Mollusca and six Polychaeta, the remaining taxa added ten species (total 47 species in eight Phyla). Grazing by mesoherbivores affected the algae and the mollusk Aplysia protea damaged new cultures significantly. The abundance of tubes built by the amphipod Euricthonius brasiliensis impairs algal aspect and facilitates colonization by other organisms.
Revista De La Facultad De Agronomia De La Universidad Del Zulia, 2007
Boletín del Instituto Oceanográfico de Venezuela, 2003
... JORGE E. BARRIOS, BRIGHTDOOM MÁRQUEZ & MAYRÉ JIMÉNEZ RESUMEN: Las raíces del mangle r... more ... JORGE E. BARRIOS, BRIGHTDOOM MÁRQUEZ & MAYRÉ JIMÉNEZ RESUMEN: Las raíces del mangle rojo Rhizophora mangle, presentan una comunidad biológica compuesta por numerosos organismos. Se estudiaron las macroalgas asociadas a raíces de R. mangle en ...
Boletín del Instituto Oceanográfico de Venezuela, 1995
Acta Biologica Venezuelica, Jun 9, 2021
Acta Biologica Venezuelica, Jun 9, 2021
La costa venezolana posee amplias extensiones con sectores arenosos y areno-fangosos en los que s... more La costa venezolana posee amplias extensiones con sectores arenosos y areno-fangosos en los que se desarrollan algunas plantas marinas sumergidas, conocidas como “Pastos Marinos” debido a su apariencia similar al de Gramíneas. Este trabajo es parte de la revisión de herbarios y literatura disponible desde 1978 hasta el presente, y el monitoreo de estas plantas en los primeros 10 m de profundidad. En estos se han descrito hasta el momento 5 géneros y 9 especies, de las cuales Thalassia testudinum König, Halophila baillonis Ascherson, Halophila decipiens Ostenfeld y Halophila stipulacea (Forsskal) Ascherson se encuentran incluidas en la Familia Hydrocharitaceae. Esta última es una especie introducida, que debe ser revisada y permanentemente monitoreada. Halodule beaudetteii Den Hartog, Halodule wrightii Ascherson y Syringodium filiforme Kützing dentro de la familia Cymodoceae; Ruppia maritima L. y Ruppia didyma Sw. ex Wiks en la familia Ruppiaceae, son las especies conocidas hasta el presente. Sin embargo, muchas de estas especies deben continuar estudiándose, debido a que crecen por debajo de los 10 m y aún quedan numerosas localidades por explorar, principalmente en el área insular. Este trabajo puede complementarse con un rastreo y colección en conjunto con la Federación de Buceo en Venezuela. FVBV para ampliar el conocimiento de la distribución de estas plantas. 
Revista De Biologia Tropical, 2016
Several species of sea urchins are a potential resource for the production of gonads for consumpt... more Several species of sea urchins are a potential resource for the production of gonads for consumption in Venezuela. We studied the gametogenic cycle and the gonadosomatic index (GSI) of the rock boring urchin Echinometra lucunter between June 2010 and November 2011 in northeastern Venezuela (Isla Lobos, Peninsula de Araya and Turpialito, Gulf of Cariaco). The gonads are composed of long ramified acini, covered by connective tissue, followed by a thin layer of cells that differentiate into nutritive phagocytes and gametes, which change in their proportion and size with the maturity stage. Generally, several maturity stages were observed in both locations, showing simultaneous spawning. At Isla de Lobos the individuals in reserve stage predominated with a short period of sexual maturity, while mature and spawned individuals predominated in Turpialito. The GSI suggests that the greatest spawning activity is associated to the rainy season; showing a conservative reproductive activity, ac...
Boletin Del Instituto Oceanografico De Venezuela, 2009
Se presenta una sinopsis historica y un catalogo actualizado de las macroalgas del golfo de Caria... more Se presenta una sinopsis historica y un catalogo actualizado de las macroalgas del golfo de Cariaco (estado Sucre, Venezuela) en base a la bibliografia disponible hasta la fecha. Se encontraron un total de 108 especies de macroalgas: 46 Rhodophyta (42,6 %), 32 Ochrophyta (29,6%) y 30 Chlorophyta (27,8%). Se revisaron en total 16 publicaciones que citan macroalgas colectadas en el golfo de Cariaco. La mayor parte de los trabajos incluidos en este estudio tiene mas de 30 anos, porlo que se recomienda realizar un nuevo inventario de las macroalgas del golfo de Cariaco. Palabras clave: Inventario, macroalgas, golfo de Cariaco. ABSTRACT: A historical synopsis and an updated database of Gulf of Cariaco macroalgae are presented based on the bibliography available up to date. One hundred and eight species of macroalgae are depicted: 46 Rhodophyta (42.6%), 32 Ochrophyta (29.6%), and 30 Chlorophyta (27.8%). The review encompasses 16 publications recording algae collected in thegulf. Most of the works included in this study were written over 30 years ago; a new annotated account of the Gulf of Cariaco macroalgae is imperative. Key words: Check list, macroalgae, Cariaco’s gulf.
Boletín del Centro de Investigaciones …, 2009
AquaTechnica: Revista Iberoamericana de Acuicultura., 2020
Se realizó un estudio fitoquímico y de bioactividad a los extractos en cloroformo, a... more Se realizó un estudio fitoquímico y de bioactividad a los extractos en cloroformo, acetato de etilo y metanol del alga Kappaphycus alvarezii Doty (recolectada en la Isla de Cubagua, Venezuela). Los valores de CL50 en el bioensayo realizado con todos los extractos obtenidos, mostraron toxicidad ante larvas del crustáceo Artemia salina (CL50
Boletin Del Instituto Oceanografico De Venezuela, 2009
Griffithsia caribaea FELDMANN (Ceramiaceae, Rhodophyta) is reported for the first time in the Ven... more Griffithsia caribaea FELDMANN (Ceramiaceae, Rhodophyta) is reported for the first time in the Venezuelan coasts, collected in Cabo San Román, Falcón state. This species is characterized for presenting a small thallus with cylindrical, sub-cilindrical and clavate cells and an involucral crown composed by eight cells in esporophytic phase. This constituted the third specie record of the genus Griffithsia for Venezuelan.
Revista De Biologia Tropical, 2015
Echinometra lucunter is relatively abundant in the Venezuela coast, however no details are known ... more Echinometra lucunter is relatively abundant in the Venezuela coast, however no details are known about its diet. We compare the stomach contents and repletion index of E. lucunter with macroalgae available in their environment (June 2010-August) and the nutrient cycle at the Golfo de Cariaco. Seventy-one species of macroalgae were identified: Rhodophyta (45), Heterokontophyta (11) and Chlorophyta (15). The mean testa diameter was 41.04 ± 6.60 mm. The food preferences included filamentous, siphonal and calcaeous macroalgae; main food items were the filamentous macroalgae Sphacelaria sp. and Herposiphonia sp., and foliose Dictyota sp., including invertebrates such as sponges, bivalves and barnacle crustaceans. The repletion index was 0.8 - 6.0 % (2.6 ± 1.21 %), maximum values were associated to primary productivity cycle, i.e. December 2010 (6.0 ± 2.21 %), April (4.3 ± 0.34 %), June 2011 (4.0 ± 1.79 %). Food preferences could be associated to the upwelling season and productivity cycle.
Revista de Biología Tropical, 2000
The associated fauna of Gracilariopsis tenuifrons (Gracilariaceae, Rhodophyta) cultures was colle... more The associated fauna of Gracilariopsis tenuifrons (Gracilariaceae, Rhodophyta) cultures was collected between october 1994 and december 1996 in Chacopata (Sucre State, Venezuela) and preserved in 10% formaldehyde. The species list includes 17 Crustacea, 14 Mollusca and 6 Polychaeta, the remaining taxa added 10 species (total 47 species in eight Phyla). Grazing by mesoherbivores affected the algae and the mollusk Aplysia protea damaged new cultures significantly. The abundance of tubes built by the amphipod Eurirthonius brasiliensis impairs algal aspect and facilitates colonization by other organisms.
Fontus, 1999
En la costa norte de Araya, Estado Sucre (Venezuela), de han establecido recientemente cultivos p... more En la costa norte de Araya, Estado Sucre (Venezuela), de han establecido recientemente cultivos piloto de E. denticulatum y K. alvarezii con el fin de extender su cultivo y exportar materia prima para la industria procesadora de algas. A pesar de que los cultivos de
estos géneros representan nuevas fuentes de ingreso para muchos países, provocan numerosos impactos negativos en la biodiversidad, y en el caso de Venezuela, se incrementa el peligro de daños en los ecosistemas marinos por tratarse de especies con características invasivas provenientes de provincias biogeográficas ajenas al Mar Caribe, por lo que se presenta en este trabajo una revisión crítica de los riesgos de introducir las algas exóticas E. denticulatum y K. alvarezii en nuestro país.
Boletín del Instituto Oceanográfico de Venezuela, 2021
The non-native red alga Kappaphycus alvarezii introduced for mariculture has spread and impacts t... more The non-native red alga Kappaphycus alvarezii introduced for mariculture has spread and impacts the hydrocoral reef Millepora alcicornis in Cubagua island, Venezuela. Biodiversity and coral cover were compared in two reefs (invaded and clean) using statistical and ecological tests. Photoquadrats were obtained in 6 transects in each reef in march and april 2009 and estimated the biota cover using the Image-J program. Were identified 25 benthic animals, 81 macroalgae and the seagrass Thallasia testudinum. The alga K. alvarezzi grew on M. alcicornis forming compact thalli attached to the coral, destroyed them by shadowing and smothering effects. Grazing by herbivores is evident in invasive algae. Statistical tests showed significant differences between the reefs studied. The native algae Caulerpa chemnitzia, present at both sites, increased its covering on the reef affected by the exotic algae, showing an inverse relationship between the cover of these algae and the coral cover. A synergistic relationship was determined between both species of macroalgae to the detriment of the coral reef. The invasion of corals by K. alvarezzi can lead to a phase of change that modifies the structure of the reef or causes its disappearance