7 research outputs found

    Primer registro del dinoflagelado <em>Neoceratium digitatum<em> (Sch眉tt) G贸mez, Moreira y L贸pez-Garc铆a 2009 (Dinophyceae), en aguas del Caribe colombiano

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    For the first time, the presence of the species Neocerarium digitatum (Sh眉tt) G贸mez, Moreira y L贸pez-Garc铆a 2009 (Family Ceratiaceae) is recorded from the Colombian Caribbean coast, collected in Punta Roca (Atl谩ntico). The form of this species found has an epitheca in the shape of a spoon and bent backwards, the right horn is straight, short and thin and the left horn is thick and bent back. The species habitat deep waters of warm latitudes. It is considered rare in phytoplankton samples

    Nuevos datos sobre la presencia de caim谩n llanero (<em>Crocodylus intermedius<em>) y notas sobre su comportamiento en el r铆o Vichada, Orinoquia (Colombia)

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    During 2010 and 2011 diurnal and nocturnal surveys were conducted in the drainages of the Meta and Vichada rivers (Colombian Orinoco Basin) to update the information about the conservation status of the Orinoco crocodile芒s populations in the wild. Between November 2010 and March 2011 stretches of six watercourses of the Meta river Basin and a stretch of the Vichada river were sampled, covering 2460.3 km, and 199.2 km of nocturnal censuses were traveled. Six observations were made in the Vichada river, corresponding to two individuals (one seen twice, the other seen four times) and crocodile tracks were found on two beaches. Additionally, territorial behavior of one of the individuals observed was registered. No crocodiles were seen in the stretches of the Meta River, or any of its tributaries surveyed. Apparently, the populations in the areas studied have not recovered since 1994-1997, the last time data were obtained, probably due to the annual plundering of nests, the destruction of habitat and the accidental or deliberate death of individuals

    Nuevos datos sobre la presencia de caim谩n llanero (Crocodylus intermedius) y notas sobre su comportamiento en el r铆o Vichada, Orinoquia (Colombia)

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    During 2010 and 2011 diurnal and nocturnal surveys were conducted in the drainages of the Meta and Vichada rivers (Colombian Orinoco Basin) to update the information about the conservation status of the Orinoco crocodile芒s populations in the wild. Between November 2010 and March 2011 stretches of six watercourses of the Meta river Basin and a stretch of the Vichada river were sampled, covering 2460.3 km, and 199.2 km of nocturnal censuses were traveled. Six observations were made in the Vichada river, corresponding to two individuals (one seen twice, the other seen four times) and crocodile tracks were found on two beaches. Additionally, territorial behavior of one of the individuals observed was registered. No crocodiles were seen in the stretches of the Meta River, or any of its tributaries surveyed. Apparently, the populations in the areas studied have not recovered since 1994-1997, the last time data were obtained, probably due to the annual plundering of nests, the destruction of habitat and the accidental or deliberate death of individuals.Durante fines de 2010 e inicios de 2011 se realizaron muestreos diurnos y nocturnos en las cuencas del r铆o Meta y Vichada (Orinoquia colombiana), con objeto de actualizar la informaci贸n sobre el estado de conservaci贸n de las poblaciones de caim谩n llanero o cocodrilo de Orinoco (Crocodylus intermedius) en estado silvestre. Entre noviembre de 2010 y marzo de 2011 fueron muestreados 2.460,30 km en varios tramos de seis cursos de agua de la cuenca del r铆o Meta y en un tramo del r铆o Vichada, con 199,20 km de censos nocturnos. En el r铆o Vichada se registraron visualmente dos individuos, el primero en dos ocasiones y el segundo en cuatro, adem谩s de la localizaci贸n de dos rastros en sustrato arenoso. Adicionalmente se registr贸 un comportamiento de territorialidad de uno de los individuos observados. En los tramos del r铆o Meta y de sus afluentes muestreados no se registr贸 ning煤n individuo ni ning煤n rastro. Las poblaciones en las zonas estudiadas no parecen haberse recuperado desde que se tomaron los 煤ltimos datos de estimaci贸n de poblaci贸n en los a帽os 1994-1997, posiblemente por el saqueo anual de nidos, la destrucci贸n de h谩bitat y la muerte accidental o premeditada de individuos

    Apistogramma megaptera (Perciformes: Cichlidae), una nueva especie para la cuenca del Orinoco

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    We describe a new species, Apistogramma megaptera (Perciformes: Cichlidae) that occurs in the upper Orinoco River Basin, in the In铆rida, Atabapo and Mavaca rivers of Venezuela and Colombia. This species is characterized by a deep body and a sexual dimorphism expressed in the different shape of the dorsal and caudal fins of males and females, as well as color pattern. Other diagnostic features that differentiate it from other species from Orinoco with crossbars on the caudal fin (Apistogramma iniridae, A. velifera and A. inornata) are: anal fin with marginal black stripe; dorsal fin with a thin marginal black line; infraorbital band wide, its width equal to the pupil; these characters are not present in the above mentioned species. The males reach a larger size (58.7 mm LS) than females (39 mm LS). The pigmentation in the form of crossbars on the tail fin is the character that distinguishes it from other species in the Orinoco River Basin that have immaculate caudal fin (Apistogramma alacrina, A. hoignei, A. hongsloi, A. guttata, A. macmasteri and A. viejita).Se describe una nueva especie, Apistogramma megaptera (Perciformes: Cichlidae), distribuida en la cuenca alta del Orinoco (r铆os In铆rida, Atabapo y Mavaca) de Venezuela y Colombia. Esta especie se caracteriza por presentar un cuerpo elevado y dimorfismo sexual marcado, expresado en la forma de las aletas (dorsal y caudal) de los machos y hembras, as铆 como en el patr贸n de coloraci贸n. Otros caracteres diagn贸sticos que la diferencian de las dem谩s especies orinoquenses con barras transversales en la aleta caudal (Apistogramma iniridae, A. velifera y A. inornata), incluyen: aleta anal con franja negra marginal; aleta dorsal con presencia de una fina l铆nea negra marginal y una banda infraorbital gruesa, cuyo ancho es igual al de la pupila. Estos caracteres est谩n ausentes en las otras especies descritas. Los machos alcanzan una mayor talla (58.7 mm LE) que las hembras (39 mm LE). Respecto a las especies restantes en la cuenca del Orinoco que presentan aleta caudal inmaculada (Apistogramma alacrina, A. hoignei, A. hongsloi, A. guttata, A. macmasteri y A. viejita), la pigmentaci贸n en forma de barras transversales en la aleta caudal es el car谩cter que diferencia a A. megaptera

    Tereb茅lidos (Terebellidae: Polychaeta: Annelida) del Caribe colombiano

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    Polychaetes have a high diversity and abundance in all oceans. They have important role as biological indicators of marine water quality. In Colombia, they have been studied for about 30 years, in which 43 families, 138 genera and 253 species have been identified, from central and north Colombian Caribbean coasts. The aim of this research was the taxonomic analysis of material belonging to the family Terebellidae, deposited in the Invemar Invertebrate Collection. Eight genera and 11 species of terebellids were previously identified; nevertheless, after this research, these numbers were increased to ten genera, and 17 species. The scarce information about polychaetes available in Colombia, and the lack of stardardized, updated taxonomic world revisions, not only for terebellids but also for the entire group of polychaetes, led to many incorrect species identifications, and the belief that some species are cosmopolitan in distribution. Anincrease in funding of basic taxonomic research will permit better estimates of the true polychaete diversity found in Colombian seas.Los poliquetos presentan una amplia diversidad y abundancia en todos los oc茅anos. Su principal importancia radica en su uso como indicadores de calidad del agua, ayudando a identificar contaminaci贸n marina. El estudio de estos an茅lidos en Colombia lleva un poco mas de 30 a帽os, durante los cuales se ha logrado identificar 43 familias, 138 g茅neros y 253 especies de poliquetos, principalmente de la costa central y norte del Caribe colombiano. El prop贸sito de esta investigaci贸n fue analizar taxon贸micamente el material correspondiente a la familia Terebellidae depositado en la Colecci贸n de Invertebrados de Invemar. El an谩lisis de los ocho g茅neros y 11 especies previamente reportadas para esta familia, dio como resultado un aumento en ambas categor铆as, pues se encontr贸 que hay realmente diez g茅neros y 17 especies. La escasez de informaci贸n en el pa铆s, as铆 como de revisiones taxon贸micas mundiales estandarizadas, consistentes y actualizadas, tanto de esta familia como de otras, hace que se identifiquen incorrectamente las especies, considerando algunas especies como cosmopolitas. Por lo tanto, se considera que un incremento en el apoyo a la investigaci贸n b谩sica, que apunte hacia el conocimiento de las especies, permitir谩 estimar la biodiversidad que realmente poseen los mares de Colombia

    Peces del departamento de Caldas, Colombia

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    The Caldas Department has a rich natural environment, diversity of altitudes above sea level, climates and landscape that provide the region with abundant biotic resources. The presence of Central and Western Andean ranges determines the distribution of water that flows into the two main hydrographic drainages of the department, the Magdalena River basin and the basin of the Cauca River. Based on published studies the ichthyological department drew up for the first time, a list of fish species present in the Department of Caldas. This extensive literature review includes studies of the drainages found in all of the 27 counties of Caldas. This list recorded 133 species, 28 families and nine orders, of which 18 species are classified as endangered or threatened , 11 species are endemic to Colombia, and one new species is recorded for the country. Also listed are 17 species of fish used in pisciculture and 14 introduced species. It is possible that as research of fish resources progresses in the region, the inventory will significantly increase. It is hoped that this study will serve as a starting point for taxonomic, ecological and conservation of the fish fauna of the department

    Primer registro del dinoflagelado <em>Neoceratium digitatum<em> (Sch眉tt) G贸mez, Moreira y L贸pez-Garc铆a 2009 (Dinophyceae), en aguas del Caribe colombiano

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    Se registra por primera vez la presencia de la especie Neocerarium digitatum (Sh眉tt) G贸mez, Moreira y L贸pez-Garc铆a 2009, perteneciente a la familia Ceratiaceae en el Caribe colombiano, colectada en el sector de Punta Roca (Atl谩ntico). La forma hallada presenta las caracter铆sticas propias de la especie, como la de poseer una epiteca en forma de cuchara y retorcida hacia atr谩s, el cuerno derecho recto, corto y delgado y el cuerno izquierdo grueso y doblado hacia atr谩s. La especie habita en latitudes c谩lidas, en aguas profundas y se considera rara en muestras de fitoplancton.Art铆culo revisado por pare
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