Examinando por Materia "Richness"

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  • Miniatura
    PublicaciónAcceso abierto
    Distribución espacial del ensamblaje de Macroinvertebrados asociada al litoral rocoso del Pnn Ensenada de Utría, Pacífico Colombiano.
    (2015-09-16) Herrera Paz, David L.; Londoño Cruz, Edgardo; Blanco, Juan F.
    La distribución de los organismos que habitan en los litorales rocosos del mundo es afectada por diversos factores físicos que varían con respecto a la altura intermareal, la cual se hace particularmente amplia en la costa pacífi ca colombiana. Debido a esto se estudió cómo la localidad, la exposición al oleaje y la posición en la zona intermareal afectan la riqueza, la abundancia y la distribución de las especies más representativas que se encuentran en los litorales rocosos del Parque Nacional Natural Utría (PNNU). Las especies más abundantes fueron los gasterópodos Nerita scabricosta, N. funiculata, Littorina modesta, L. aspera y el cirripedio Cthamalus panamensis, y mostraron un claro patrón de segregación dentro de la zona intermareal. La exposición al ojeaje dentro de las pequeñas bahías de las tres localidades infl uyó en la riqueza y el promedio de especies encontradas, pero no en la abundancia. Por otro lado, el patrón de distribución observado en las especies más abundantes se explica principalmente por las características intrínsecas y su capacidad para colonizar áreas específi cas a lo largo del litoral rocoso. Abstract The distribution of organisms that inhabit the rocky shores of the world is affected by several physical factors that vary with respect to the intertidal height, which is particularly wide in the Pacifi c coast of Colombia. This study shows the effect of location, wave exposure and position in the intertidal zone on the richness, abundance and distribution of the most distinctive species found on the rocky shorelines of The Utría National Park ( PNNU ), Colombia. The most abundant species, gastropods Nerita scabricosta, N. funiculata modest Littorina, L. aspera and barnacle Cthamalus panamensis, showed a clear pattern of segregation within the intertidal zone. Wave exposure in the bays of the three locations infl uenced the richness and average but not the abundance of the species. For the most abundant species, the observed distribution pattern is mainly due to intrinsic features and their ability to colonize specifi c areas along the rocky shoreline.
  • Miniatura
    PublicaciónAcceso abierto
    Seasonal variation of the epigeal coleopteran diversity in the Laguna Carén (Santiago, Chile).
    (Universidad del Valle, 2018-12-31) Alvarado Orellana, Alexandra; Huerta Fuentes, Amanda; Palma Muñoz, Álvaro; Rodríguez Tobar, Sebastián; Sociedad Colombiana de Entomología - Socolen; Universidad del Valle; Montoya Lerma, James
    The seasonal variation of epigeal coleopteran diversity and physical-chemical parameters associated to water quality in the Laguna Carén (Santiago, Chile) was evaluated. Different physical-chemical parameters of lagoon water were measured in spring and summer at four random sampling stations, representative of the vegetable coverages. The epigeal coleopterans of the shore were collected by means of interception traps (n = 40), installed at random. It was estimated the abundance and richness of the coleopterans by sampling station and season. In addition, they were separated into trophic guilds: phytophagous, predatory and saprophagous. The differences in abundance and richness were evaluated with nonparametric Kruskal-Wallis tests, followed by Dunn (sampling station) and Mann-Whitney (season) tests. The same statistical procedure was applied to trophic guilds. The ensemble of species of epigeal coleopteran was represented by 19 species (14 natives) from eight families, constitutes the first record of insects in the lagoon. The richness of epigeal coleopteran was significantly higher in spring; while abundance was in summer, concurring with the sampling stations with higher coverages. The availability of food and shelter for epigeal beetles would be influenced mainly by anthropic factors, which lead to a greater degree of fragmentation and alteration of the habitat. The information generated can serve as a basis for future research on bioindicators in vulnerable wetlands in the Mediterranean region.