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| Registros recuperados: 490 | |
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| Diaz,Marina; Do Souto,Marina; Peralta,Marina; Pájaro,Marcelo; Spinelli,Mariela; Saraceno,Martín; Balestrini,Carlos; Capitanio,Fabiana. |
| La población patagónica de Engraulis anchoita habita el sector costero comprendido entre los 42° y 46° S. Sus áreas de desove y cría se asocian al frente de marea de Península Valdés, que se forma a fnes de la primavera y desaparece a principios de otoño. Las condiciones oceanográfcas del frente generan una alta productividad primaria y elevada biomasa del zooplancton asociado, potencial alimento para larvas de peces. Se estimó la condición nutricional de larvas de anchoíta por medio de tres índices: el Factor de Condición de Fulton, la relación ARN/ADN y la performance de crecimiento. Se compararon dos secciones oceanográfcas: una en la que se detectó la presencia del frente de marea y otra sin ese efecto. Los resultados de los índices evidenciaron una... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Índice ARN/ADN; Frente de Península Valdés. |
| Ano: 2016 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1667-782X2016000200003 |
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| Gantes,Patricia; Falco,Liliana; Sánchez Caro,Aníbal. |
| Las riberas son ecosistemas espacial y temporalmente heterogéneos que favorecen una alta diversidad, pero que se podrían ver afectadas por la intensificación de ciertas perturbaciones antrópicas. Con el propósito de aportar información de base, que permita evaluar los efectos sobre la biodiversidad de eventuales disturbios, se caracteriza la vegetación por sus grupos biológicos y se analizan tres aspectos: la diversidad a tres escalas (margen, tramo y cuenca), su relación con características topográficas y edáficas y los cambios asociados a la presencia de ganado. Se identificaron 130 taxa; entre ellas, Cynodon dactylon y Eleocharis spp. tuvieron una frecuencia cercana al 100% y fueron los de mayor cobertura. Se halló 51% de especies herbáceas perennes,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Riqueza específica; Grupos biológicos; Escalas espaciales; Species richness; Biological groups; Spatial scales. |
| Ano: 2017 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1667-782X2017000100010 |
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| Figueroa,Javier A; Hernández,Juan F. |
| This study determined germination responses of 19 species, including trees, shrubs, vines, and herbs, under natural gap and non-gap conditions, in a secondary forest in Chiloé Island, southern Chile, in order to assess if there is any association between the habitat where the seedlings of these plant species occur and their germination requirements. Statistical differences in percentage seed germination were detected in six species in a gap habitat compared to the understory. Five forest edge species (Embothrium coccineum, Escallonia rubra, Gunnera tinctoria, Nertera granadensis and Rhaphithamnus spinosus) presented greater germination success in the canopy gap, while only one forest interior species (Myrceugenia planipes) germinated to a lesser extent in... |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 2001 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1667-782X2001000100007 |
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| Raya Rey,Andrea; Schiavinin,Adrián. |
| We assessed the energy requirements and the food consumption of the seabird community of the Beagle Channel in summer. We evaluated differences in energy flow among a priori established zones in the study area and among species. We converted data on densities of seabirds in the channel (February and March 1997) into energy demands. Energy flow to seabirds in shallow waters was twice that of in deep waters. Average energy flow in the whole study area was 9.46×10(4) kJ.km-2.day-1. Energy intake rates ranged 4-13×10(4) kJ.km-2.day-1, being higher in zones that include breeding sites or close to them. Imperial Cormorant was the major contributor to energy flow in all the zones followed by the Black-browed Albatross. Kelp Gull was the major contributor in areas... |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 2001 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1667-782X2001000200008 |
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| Vergara,Pablo M. |
| Using large and small nest boxes I determined the effect of the nest box size upon nesting and renesting probability, as well as the reproductive success of two secondary cavity nesters, the thorn-tailed rayadito (Aphrastura spinicauda) and the house wren (Troglodytes aedon) was determined comparing large and small boxes. In order to assess these effects nest boxes were monitored by two consecutive years. Results indicated that Aphrastura nested mainly in the large instead of the small nest boxes, and nesting Troglodytes used primarily small nest boxes. Nevertheless, the renesting pattern of both species, including renesting attempts after successful fledging and after nest failure, was not affected by nest box size and the probability of renesting was not... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Nesting; Renesting probability; Nest box use. |
| Ano: 2007 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1667-782X2007000100012 |
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| Gönc,Romina L.; Casaux,Ricardo J.; Szulkin-Dolhatz,Daniel. |
| Nothofagus antarctica is a species of the Andean-Patagonian forest with a wide distribution from the north of Neuquén to Tierra del Fuego. Although the N. antarctica forests are of great economic importance for the region, they are intensely affected nowadays by human activities such as grazing, firewood extraction, conversion into pastures and the replacement by coniferous plantations. These activities produce changes in the N. antarctica forest, mainly by the alteration of its original structure affecting the performance of the ecosystem as a whole, resulting in the loss of biodiversity. Since July 2008 up to May 2010 in the northwest of Chubut, Patagonia, we analyzed the effect of disturbances associated with different management strategies on species... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Impacts of forest management; Patagonia; Conservation. |
| Ano: 2015 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1667-782X2015000300008 |
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| Reynaga,María Celina; Dos Santos,Daniel Andrés. |
| Los rasgos biológicos reflejan las tácticas de los organismos como respuesta al cambio ambiental. Analizamos la organización funcional del grupo EPT (Ephemeroptera, Plecoptera y Trichoptera) en una cuenca subtropical de montaña para evaluar si sus rasgos biológicos están asociados con patrones espacio-temporales de variación ambiental y si la actividad humana modifica la organización funcional de las comunidades. Entre 2005 y 2007 muestreamos 11 ríos durante dos períodos hidrológicos consecutivos, de alto y bajo caudal. Definimos diez rasgos biológicos a nivel de género, incluyendo aspectos de morfología (tamaño máximo, forma del cuerpo y flexibilidad, dureza del exoesqueleto), fisiología (déficit de tolerancia al oxígeno, tipo de la respiración y la forma... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: EPT; Organización funcional; Yungas; Análisis RLQ. |
| Ano: 2012 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1667-782X2012000200004 |
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| Registros recuperados: 490 | |
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