We record the invasive thiarid snail Melanoides tuberculata (Müller, 1774) for the first time in the lower basin of the Sinú River, Córdoba, Colombia. We counted 2,892 individuals and collected 38 specimens at 4 localities in the basin. The introduction of this species is suspected to have occurred in different ways, but human transport and the aquarium trade are the most probable pathways. The presence of this species in the Sinú River is especially important because of its potential spread to other river basins in the region.
ResumenEntre septiembre de 2006 y junio de 2007 se caracterizó la estructura del ensamblaje de quitones en siete estaciones del litoral rocoso del departamento de Córdoba, Colombia. Para los muestreos se utilizó una cadena, delimitando un área de 25 m 2 con tres repeticiones dispuestas al azar en cada estación a profundidades iguales o menores a 1 m. Se recolectaron en total 524 ejemplares de cinco especies de las familias Acanthochitonidae, Chitonidae y Ischnochitonidae. El estudio evidencia que la estructura del ensamblaje de quitones en Córdoba, está definida por tres conglomerados de estaciones; el primero, formado por las estaciones 1 y 2 de San Antero, caracterizado por Acanthopleura granulata y Chiton tuberculatus; el segundo, constituido por las estaciones 3, 4, 5 y 6 de Moñitos y Puerto Escondido, reunió a A. granulata, C. marmoratus y C. tuberculatus, mientras que el tercer conglomerado se asoció con la estación 7 de Los Córdobas, destacando a C. marmoratus como la especie dominante. Se incluyen dos nuevos registros para el Caribe cordobés; Acanthochitona spiculosa e Ischnochiton striolatus, las cuales fueron recolectadas en costas de la plataforma rocosa de San Antero, Moñitos y Puerto Escondido.Palabras clave: Colombia, ensamblaje, litoral rocoso, Polyplacophora, quitones AbstractBetween September 2006 and June 2007 the assembly structure of chitons was characterized in seven stations of the rocky coast of Cordoba, Colombia. In samples was used a string defining an area of 25 m 2 with three replications randomly arranged at each station at depths equal to or less than 1 m. Were collected 524 specimens of five species of the families Acanthochitonidae, Chitonidae, and Ischnochitonidae. The study shows that three clusters of stations define the assembly structure of chitons in Cordoba. The first one formed by station 1 and 3 of San Antero, characterized by the presence of Acanthopleura granulata and Chiton tuberculatus. The second one formed by stations 3, 4, 5 and 6 of Moñitos and Puerto Escondido, gathered A. granulata, C. marmoratus, and C. tuberculatus while the third cluster was associated with station 7 of Los Córdobas, showing C. marmoratus as the dominant specie. It was included two new records for the Caribbean Cordoba; Acanthochitona spiculosa and Ischnochiton striolatus, which were collected from rocky shores of San Antero platform, Moñitos, and Puerto Escondido.
Abstract.-Between September 2006 and June 2007 the composition and abundance of polychaetes associated with intertidal red algae was studied, in 7 stations along the coast of Córdoba, Colombian Caribbean. To collect the specimens a quadrant of 625 cm 2 with 5 replicates randomly arrange at each sampling point was used. All intertidal red algae fronds examined contained polychaetes with a record of 288 individuals belonging to 19 species of 7 families. The most abundant species was Platynereis dumerilii (Nereididae) with 188 individuals, followed by Pseudonereis gallapagensis (Nereididae) with 23 individuals and Syllis corallicola (Syllidae) with 12 individuals. Also the sedentary polychaetes, Hydroides sanctaecrusis (Serpulidae) with 4 individuals and Pista palmata (Terebellidae) with 5 individuals were collected. The highest abundance of polychaetes abundance was recorded in December (T2) and March (T3) with 79 and 103 individuals respectively, and the lowest in September (T1) and June (T4) with 47 and 59 individuals. According to the ANOSIM test there were no significant differences among groups (R = 0.09, P = 0.52). This is because the polychaete P. dumerilii had the highest similarity contribution (> 77%) in each group, indicating which was the most important in terms of abundance in all sampling months. Finally, the species collected in the algal fronds are characteristic species of soft bottom and rocky substrates, suggesting a non-specific adaptation of these species to substrates algal. Key words:Platynereis dumerilii, Rhodophyta, communities, coastline, CórdobaResumen.-Entre septiembre 2006 y junio 2007 se estudió la composición y abundancia de poliquetos asociados a algas rojas intermareales, en 7 estaciones de la franja costera cordobesa del Caribe colombiano. Para la recolección de los especímenes, se delimitó un cuadrante de 625 cm 2 , con 5 réplicas dispuestas al azar en cada punto de muestreo. Todos los frondes de algas rojas examinados evidenciaron la presencia de poliquetos, con un registro de 288 individuos pertenecientes a 19 especies de 7 familias. La especie más abundante fue Platynereis dumerilii (Nereididae) con 188 individuos, seguida de Pseudonereis gallapagensis (Nereididae) con 23 individuos y Syllis corallicola (Syllidae) con 12 individuos. También se colectaron los poliquetos sedentarios, Hydroides sanctaecrusis (Serpulidae) con 4 individuos y Pista palmata (Terebellidae) con 5 individuos. La abundancia más alta de poliquetos se registró en diciembre (T2) y marzo (T3) con 79 y 103 individuos respectivamente, y la menor ocurrió en septiembre (T1) y junio (T4) con 47 y 59 individuos. Con relación a la prueba ANOSIM, no se registró una agrupación significativamente diferente de la otra (R = 0,09, P = 0,52), debido a que P. dumerilii mostró el más alto porcentaje de contribución (> 77%) en cada agrupación, lo que indica que fue la especie más importante, en términos de abundancia, durante los meses de muestreo. Finalmente, las especies colectadas en los frondes algales son especies carac...
Density population and size structure of the sea cucumber Holothuria (Halodeima) grisea (Aspidochirotida: Holothuriidae) in shallow waters south of the gulf of Morrosquillo, Colombian Caribbean. Holothuria grisea, despite not being considered a commercial resource has been the subject of illegal extractions in Colombia, a fact that becomes more serious due to the empty of biological information of these organisms. For this reason the density population and size structure of H. grisea were evaluated in three sectors south of the gulf of Morrosquillo from April to November 2015. To this end, three circular transects were located each month in each sampling site covering an area of 300 m2, where individuals were counted and measured in situ. The average density of H. grisea in the study area was 0.4 ind m-2, with the highest values in the La Ahumadera (1.09 ± 0.11 ind m-2) and the lowest values in Banco de Arena (0.02 ± 0.004 ind m-2). The analysis of variance showed a significance in the values of density and size of H. grisea in the studied sectors. The species presented a unimodal distribution of sizes with an average size of 13.5 ± 0.9 cm with a minimum size of 2.5 and a maximum of 30 cm, intermediate sizes generally showed a higher representativeness throughout this study (77.2 %). The biological aspects presented in this paper are of great importance for the conservation of this species and corresponds to an advance in the knowledge of the Holothuroidea class in the Colombian Caribbean. Rev. Biol. Trop. 66(2): 776-787. Epub 2018 June 01.
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