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Registros recuperados: 10
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Abundancias poblacionales, crecimiento y mortalidad natural de la macroinfauna de crustáceos en dos tipos morfodinámicos de playas arenosas del sur de Chile 97
CONTRERAS,HERALDO; JARAMILLO,EDUARDO; DUARTE,CRISTIAN; McLACHLAN,ANTON.
Se realizaron muestreos mensuales durante 1994-1996 en una playa arenosa intermedia y en una playa disipativa del sur de Chile (Calfuco y Mehuín, respectivamente; ca. 39º S), para evaluar las predicciones de la hipótesis de exclusión por la resaca sobre las abundancias poblacionales e historia de vida de la macroinfauna de crustáceos que habita en el intermareal de esas playas. Se hipotetiza que solo las especies realmente intermareales (i.e., directamente afectadas por la resaca) son afectadas por diferencias en los tipos morfodinámicos de playas. Esas especies fueron los isópodos cirolánidos Excirolana braziliensis y Excirolana hirsuticauda y el cangrejo anomuro Emerita analoga. Por otra parte, el anfípodo Orchestoidea tuberculata...
Tipo: Journal article Palavras-chave: Macroinfauna de playas arenosas; Crustáceos; Tipos morfodinámicos de playas; Sur de Chile.
Ano: 2003 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2003000400002
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Algal wrack deposits and macroinfaunal arthropods on sandy beaches of the Chilean coast 97
JARAMILLO,EDUARDO; HUZ,ROSARIO DE LA; DUARTE,CRISTIAN; CONTRERAS,HERALDO.
Four Chilean sandy beaches were sampled during the summer of 2000, to study the role of stranded algal wrack deposits on the population abundances of three detritus feeder species of the macroinfauna that inhabit the upper shore levels of that beaches: the talitrid amphipod Orchestoidea tuberculata Nicolet, the tylid isopod Tylos spinulosus Dana and the tenebrionid insect Phalerisida maculata Kulzer. The beaches were Apolillado (ca. 29° S), Quidico (ca. 38° S), Guabún and Mar Brava (ca. 42° S). Replicated samples were collected with a plastic cylinder (25 cm in diameter) from algal wrack deposits including the sediments beneath the wrack and nearby bare sand areas. Samples were collected at two beach levels, one closer to the sea with fresh deposits and...
Tipo: Journal article Palavras-chave: Algal wrack deposits; Sandy beach arthropods; Chilean coast.
Ano: 2006 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2006000300006
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Community structure of the intertidal meiofauna along a gradient of morphodynamic sandy beach types in southern Chile 97
RODRÍGUEZ,J. GERMÁN; LÓPEZ,JESÚS; JARAMILLO,EDUARDO.
Three sandy beaches located in southern Chile (Gaviotas, Guabún and Mar Brava; ca. 42º S) were studied during the summer of 2000 to analyse the patterns in abundance and biomass of the meiofauna along a gradient of morphodynamic beach types. Sediment samples were collected with metallic cylinders (23 cm² cross sectional area, 120 cm long) at ten equally spaced tidal levels along six transects separated between 5 and 10 m and extending from above the drift line down to the low tide level. Porosity, shear strength, water content, penetrability and grain size of the substrate were measured in each sampling level. The meiofauna was primarily represented by Nematoda and Copepoda Harpacticoidea. The highest average density and biomass per unit of area were found...
Tipo: Journal article Palavras-chave: Sandy beach meiofauna; Southern Chile.
Ano: 2001 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2001000400015
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Community structure of the macroinfauna in the sediments below an intertidal mussel bed (Mytilus chilensis (Hupe)) of southern Chile 97
DUARTE,CRISTIAN; JARAMILLO,EDUARDO; CONTRERAS,HERALDO; FIGUEROA,LUIS.
The mytilid mussel Mytilus chilensis (Hupe) can form dense beds in sedimentary areas of the inland coast of the Nord-Patagonic archipelagos of the Chilean coast (ca. 40-43° S). During the autumn of 2002, we collected replicated samples at five intertidal stations in Panitao (Golfo de Reloncaví) ordered along a transect parallel to the low tide level and extended from the center of the bank (stations one and two with 100 and ca. 25 % of mussel cover, respectively) to the bare sediments of the intertidal (stations 3, 4 and 5, without mussels). The macroinfauna was numerically dominated by Polychaeta, Oligochaeta and Crustacea Peracarida. The total number of species collected was 14, being the most abundant the polychaete Perinereis vallata, oligochaetes from...
Tipo: Journal article Palavras-chave: Mussel beds; Mytilus chilensis; Macroinfauna; Southern Chile.
Ano: 2006 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2006000300007
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Diversity, dynamics and biogeography of Chilean benthic nearshore ecosystems: an overview and guidelines for conservation 97
FERNANDEZ,MIRIAM; JARAMILLO,EDUARDO; MARQUET,PABLO A; MORENO,CARLOS A; NAVARRETE,SERGIO A; OJEDA,F. PATRICIO; VALDOVINOS,CLAUDIO R; VASQUEZ,JULIO A.
Despite Chile has been one of the pioneering countries in studies of human impact on marine communities, and despite the enormous economic and social significance that the marine environment has for the country, the development of marine conservation programs and the scientific basis for sustainability has not kept pace, with the exploitation rate of marine fisheries and the increasing use of the coast for other purposes. Although we think that the establishment of any conservation policies along the vast coastline of Chile must be based on a multitude of approaches and considerations, scientific, biological, and ecological principles should guide much of these efforts. In this paper, we attempt to present a general overview of the current knowledge about...
Tipo: Journal article Palavras-chave: Chile; Marine conservation; Biogeographical patterns; Community structure; Human impact.
Ano: 2000 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2000000400021
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Locomotor activity of Phalerisida maculata Kulzer (Coleoptera, Tenebrionidae) on Chilean sandy beaches 97
JARAMILLO,EDUARDO; AVELLANAL,MARIA H; GONZALEZ,MARCIA; KENNEDY,FERGUS.
The locomotor activity of the beetle Phalerisida maculata Kulzer (Coleoptera Tenebrionidae) was studied on the surface of the substrate in two sandy beaches of the Chilean coast: one in north central (ca. 29ºS) and the other in south central Chile (ca.39ºS). During the summer period of 1991 the circadian locomotor activity was studied in the southern beach, while during that of 1997 in both beaches. To analyze the activity, pitfall traps were used which were ordered along two transects extended between the upper beach and the resurgence zone. The traps were checked (i.e. collection of captured insects) every two hours for a total period of 26 hours. The results showed that the adults of P. maculata were mostly active during the night hours, whereas the...
Tipo: Journal article Palavras-chave: Sandy beaches; Insecta; Coleoptera; Locomotor activity.
Ano: 2000 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2000000100008
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Macroalgas varadas sobre la superficie de una playa arenosa del sur de Chile: preferencias alimentarias y de habitat de juveniles y adultos de Orchestoidea tuberculata (Nicolet), (Amphipoda, Talitridae) 97
DUARTE,CRISTIAN; JARAMILLO,EDUARDO; CONTRERAS,HERALDO.
El anfípodo Orchestoidea tuberculata, es el carroñero numéricamente dominante en los niveles superiores del intermareal de las playas arenosas del centro sur de Chile. La principal fuente de alimento para juveniles y adultos de este anfípodo son las macroalgas varadas en la playa. Con el objetivo de analizar una eventual partición de ese recurso alimentario por parte de esos juveniles y adultos, se realizaron experimentos tendientes a evaluar preferencias alimentarias sobre las tres macroalgas varadas más comunes de estas playas: Durvillaea antárctica, Macrocystis pyrifera y Lessonia nigrescens. Los juveniles prefirieron consumir L. nigrescens, mientras que los adultos mostraron una preferencia significativa por D. antárctica. Similar a lo registrado en...
Tipo: Journal article Palavras-chave: Playas arenosas expuestas; Macroalgas varadas; Preferencias alimentarias; Anfípodos; Centro sur de Chile.
Ano: 2008 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2008000100006
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Natural history of Emerita analoga (Stimpson) (Anomura, Hippidae) in a sandy beach of northern Chile 97
CONTRERAS,HERALDO; JARAMILLO,EDUARDO; QUIJON,PEDRO.
Sediment samplings were carried across the intertidal of the beach at Hornitos, northern Chile (22°26´S) during August and November 1996 and March, July and November 1997 for a study of the reproductive and population biology of Emerita analoga (Stimpson) (Decapoda, Anomura) in a region of the Chilean coast characterized by persistent upwelling. The highest abundances of E. analoga occurred during March and December 1997. During November 1996, March and December 1997, the highest abundances occurred below the effluent line, while in July 1996 and August 1997, most of the stages of E. analoga occurred in higher abundances above the effluent line. Ovigerous females were recorded over the entire study period. Juveniles were also present during all sampling...
Tipo: Journal article Palavras-chave: Emerita analoga; Sandy beach; Northern Chile.
Ano: 2000 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2000000400013
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Sandy beach macroinfauna from the coast of Ancud, Isla de Chiloé, southern Chile 97
JARAMILLO,EDUARDO; DUARTE,CRISTIAN; CONTRERAS,HERALDO.
Six sandy beaches were sampled on the coast of Ancud, Isla de Chiloé, southern Chile (ca. 42º S) with the following purposes: 1) to study community structure and across shore zonation of the intertidal macroinfauna in relation to different beach types, and 2) to analyze how similar or different is the taxonomic composition and community structure of the macroinfaunal assemblages, compared to those inhabiting sandy beaches located further north of Canal de Chacao, the limit between Isla de Chiloé and the mainland coast. Sediment samples (0.1 m², 30 cm deep) were collected (April-May 1998) with plastic cylinders at fifteen equally spaced levels along three replicated transects (separated by 1 m) extending from above the drift line to the swash zone. The...
Tipo: Journal article Palavras-chave: Sandy beaches; Macroinfauna; Isla de Chiloé.
Ano: 2000 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2000000400019
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Seasonal and interannual variability in population abundances of the intertidal macroinfauna of Queule river estuary, south-central Chile 97
JARAMILLO,EDUARDO; CONTRERAS,HERALDO; QUIJÓN,PEDRO.
Sediment samples were monthly collected at Queule river estuary (ca. 39° S), south-central Chile, from October 1990 to April 1992, and from September 1995 to November 1997 to study temporal variability in population abundances of the macroinfauna inhabiting sandy and muddy-sand intertidal substrates. Sandy sediments had higher percentages of sand particles and lower percentages of mud particles, biogenic aggregates and total organic matter than muddy-sand sediments. The same macroinfaunal species were found at both sites. That macroinfauna was dominated by polychaetes: the spionid Prionospio (Minuspio) patagonica Augener 1923, the capitellid Capitella sp. and the nereid Perinereis gualpensis Jeldes 1963. Other common organisms were the amphipod...
Tipo: Journal article Palavras-chave: Macroinfaunal population abundances; Estuarine intertidal flats; South central Chile.
Ano: 2001 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2001000200019
Registros recuperados: 10
Primeira ... 1 ... Última
 

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