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Papers by Ildefonso Liñero Arana
Revista De Biologia Tropical, Oct 1, 2006
The polychaetes epibiontic on the mollusk Spondylus americanus Hermann, 1781 were extracted from ... more The polychaetes epibiontic on the mollusk Spondylus americanus Hermann, 1781 were extracted from mollusks hand-collected at a depth of 10-30 m in Mochima National Park, Venezuela (10 degrees 21'00" N-63 degrees 23'36" W), using scuba diving gear. Forty-three polychaete species were identified on the 32 bivalve specimens analyzed. The Serpulidae included 17 especies, Eunicidae six and Terebellidae four species. The most abundant species were Hydroides dirampha Mörch, 1863, Pileolaria militaris Claparède, 1868 (Serpulidae), and Notaulax nudicollis Krøyer, 1856 (Sabellidae). Their geographic affinitie were: 51.3% Atlantic, 28.2% widely distributed, 17.9% Amphiamericans, and 2.6% have a disjunct distribution.
Interciencia, May 1, 2003
Boletin Del Centro De Investigaciones Biologicas, 2003
Revista De Biologia Tropical, Mar 1, 2013
Meiofauna organisms that play an important role in the trophic ecology of soft bottom benthos, ha... more Meiofauna organisms that play an important role in the trophic ecology of soft bottom benthos, have short life cycles and they respond quickly to disturbance and pollution. The present study shows the spatio-temporal variation ofsubtidal meiofauna (metazoans passing a 500im sieve but retained on meshes of 40-63micro m) in four shallow subtidal stations. Samples were taken in the sandy beach of San Luis, in the Northeastern coast of Venezuela, from October 2005 until September 2006. For this, three replicate sediment core samples (4.91cm2), were collected monthly to a depth of 10cm into the sediment, and preserved in 6% formalin stained with rose Bengal. Specimens of 14 meiofaunal groups (Foraminifera excluded) were collected, being the nematodes, ostracods and harpacticoid copepods the most abundant. Monthly density was comprised between 64 and 503ind./10cm2, and mean density of stations between 173 and 449ind./10cm2. There is a trend of low densities from October to February (end of the rainy season until the middle of the dry season). The San Luis beach control of the meiofaunal community is shared by climatic conditions and by the biology of the species found. The meiofauna mean density in San Luis beach (263ind./10cm2) was low when compared to other studies in tropical areas.
Revista de Biología Tropical, 2013
Polychaetes (Annelida: Polychaeta) epibiont on Spondylus americanus (Bivalvia: Spondylidae) from ... more Polychaetes (Annelida: Polychaeta) epibiont on Spondylus americanus (Bivalvia: Spondylidae) from Mochima National Park, Venezuela. The polychaetes epibiontic on the mollusk Spondylus americanus Hermann, 1781 were extracted from mollusks hand-collected at a depth of 10-30 m in Mochima National Park, Venezuela (10º21'00" N -63º23'36" W), using scuba diving gear. Forty-three polychaete species were identified on the 32 bivalve specimens analyzed. The Serpulidae included 17 especies, Eunicidae six and Terebellidae four species. The most abundant species were Hydroides dirampha Mörch, 1863, Pileolaria militaris Claparède, 1868 (Serpulidae), and Notaulax nudicollis Krøyer, 1856 (Sabellidae). Their geographic affinitie were: 51.3% Atlantic, 28.2% widely distributed, 17.9% Amphiamericans, and 2.6% have a disjunct distribution. Rev. Biol. Trop. 54 (3): 765-772. Epub 2006 Sept. 29.
La geografía de Ecuador está surcada por una importante red hidrográfica, con numerosos ríos que ... more La geografía de Ecuador está surcada por una importante
red hidrográfica, con numerosos ríos que se originan principalmente de los elevados relieves andinos y vierten en dos cuencas: Amazonas y Pacífico. Muchos de ellos presentan fuertes impactos antrópicos. El principal objetivo de nuestra investigación fue evaluar la calidad del
agua de la corriente Mojarrero utilizando índices bióticos (índice BMWP/ Col. Y Shannon-Wiener) como una herramienta para evaluar la salud del ecosistema. Durante junio, agosto y octubre de 2014, tomamos muestras de fondo en tres estaciones. En cada mes realizamos tres réplicas
de invertebrados acuáticos bentónicos, las muestras las tomamos en fondos de arena-piedra con una malla “D-net” de 0,3mm. La fauna estuvo representada por once órdenes y 29 familias. El orden más abundante fue Coleoptera, lo que representa 42,70% del total recogido organismos, seguido de Diptera (19,01%) y Ephemeroptera (11,38%). La familia más abundante fue Elmidae, con 568 individuos, (37,37% de
los organismos totales), seguido de Chironomidae (11,38%) y Baetidae (7,24%). Los valores de diversidad de Shannon oscilaron entre 0,98 bits/ ind. (Junio de EST. 2) y 2,23 bits / ind. (Octubre, Est 1). BMWP / Col. valores de índice de indicar que el río tiene una buena salud del medio ambiente en las secciones de alta y baja. La sección media tiene algo de contaminación, en particular durante agosto y octubre.
Revista De Biologia Tropical, Oct 1, 2006
The polychaetes epibiontic on the mollusk Spondylus americanus Hermann, 1781 were extracted from ... more The polychaetes epibiontic on the mollusk Spondylus americanus Hermann, 1781 were extracted from mollusks hand-collected at a depth of 10-30 m in Mochima National Park, Venezuela (10 degrees 21'00" N-63 degrees 23'36" W), using scuba diving gear. Forty-three polychaete species were identified on the 32 bivalve specimens analyzed. The Serpulidae included 17 especies, Eunicidae six and Terebellidae four species. The most abundant species were Hydroides dirampha Mörch, 1863, Pileolaria militaris Claparède, 1868 (Serpulidae), and Notaulax nudicollis Krøyer, 1856 (Sabellidae). Their geographic affinitie were: 51.3% Atlantic, 28.2% widely distributed, 17.9% Amphiamericans, and 2.6% have a disjunct distribution.
Interciencia, May 1, 2003
Boletin Del Centro De Investigaciones Biologicas, 2003
Revista De Biologia Tropical, Mar 1, 2013
Meiofauna organisms that play an important role in the trophic ecology of soft bottom benthos, ha... more Meiofauna organisms that play an important role in the trophic ecology of soft bottom benthos, have short life cycles and they respond quickly to disturbance and pollution. The present study shows the spatio-temporal variation ofsubtidal meiofauna (metazoans passing a 500im sieve but retained on meshes of 40-63micro m) in four shallow subtidal stations. Samples were taken in the sandy beach of San Luis, in the Northeastern coast of Venezuela, from October 2005 until September 2006. For this, three replicate sediment core samples (4.91cm2), were collected monthly to a depth of 10cm into the sediment, and preserved in 6% formalin stained with rose Bengal. Specimens of 14 meiofaunal groups (Foraminifera excluded) were collected, being the nematodes, ostracods and harpacticoid copepods the most abundant. Monthly density was comprised between 64 and 503ind./10cm2, and mean density of stations between 173 and 449ind./10cm2. There is a trend of low densities from October to February (end of the rainy season until the middle of the dry season). The San Luis beach control of the meiofaunal community is shared by climatic conditions and by the biology of the species found. The meiofauna mean density in San Luis beach (263ind./10cm2) was low when compared to other studies in tropical areas.
Revista de Biología Tropical, 2013
Polychaetes (Annelida: Polychaeta) epibiont on Spondylus americanus (Bivalvia: Spondylidae) from ... more Polychaetes (Annelida: Polychaeta) epibiont on Spondylus americanus (Bivalvia: Spondylidae) from Mochima National Park, Venezuela. The polychaetes epibiontic on the mollusk Spondylus americanus Hermann, 1781 were extracted from mollusks hand-collected at a depth of 10-30 m in Mochima National Park, Venezuela (10º21'00" N -63º23'36" W), using scuba diving gear. Forty-three polychaete species were identified on the 32 bivalve specimens analyzed. The Serpulidae included 17 especies, Eunicidae six and Terebellidae four species. The most abundant species were Hydroides dirampha Mörch, 1863, Pileolaria militaris Claparède, 1868 (Serpulidae), and Notaulax nudicollis Krøyer, 1856 (Sabellidae). Their geographic affinitie were: 51.3% Atlantic, 28.2% widely distributed, 17.9% Amphiamericans, and 2.6% have a disjunct distribution. Rev. Biol. Trop. 54 (3): 765-772. Epub 2006 Sept. 29.
La geografía de Ecuador está surcada por una importante red hidrográfica, con numerosos ríos que ... more La geografía de Ecuador está surcada por una importante
red hidrográfica, con numerosos ríos que se originan principalmente de los elevados relieves andinos y vierten en dos cuencas: Amazonas y Pacífico. Muchos de ellos presentan fuertes impactos antrópicos. El principal objetivo de nuestra investigación fue evaluar la calidad del
agua de la corriente Mojarrero utilizando índices bióticos (índice BMWP/ Col. Y Shannon-Wiener) como una herramienta para evaluar la salud del ecosistema. Durante junio, agosto y octubre de 2014, tomamos muestras de fondo en tres estaciones. En cada mes realizamos tres réplicas
de invertebrados acuáticos bentónicos, las muestras las tomamos en fondos de arena-piedra con una malla “D-net” de 0,3mm. La fauna estuvo representada por once órdenes y 29 familias. El orden más abundante fue Coleoptera, lo que representa 42,70% del total recogido organismos, seguido de Diptera (19,01%) y Ephemeroptera (11,38%). La familia más abundante fue Elmidae, con 568 individuos, (37,37% de
los organismos totales), seguido de Chironomidae (11,38%) y Baetidae (7,24%). Los valores de diversidad de Shannon oscilaron entre 0,98 bits/ ind. (Junio de EST. 2) y 2,23 bits / ind. (Octubre, Est 1). BMWP / Col. valores de índice de indicar que el río tiene una buena salud del medio ambiente en las secciones de alta y baja. La sección media tiene algo de contaminación, en particular durante agosto y octubre.