Estudios ecológicos en el Golfo San Jorge y adyacencias (Atlántico sudoccidental). Distribución, abundancia y variación estacional del fitoplancton en relación a factores físico-químicos y la dinámica hidrológica.
dc.contributor.advisor | Carreto, J.I. | |
dc.contributor.author | Akselman, R. | |
dc.coverage.spatial | Argentina , Patagonia , Santa Cruz , Golfo San Jorge | |
dc.date.accessioned | 2007-02-02T14:03:04Z | |
dc.date.available | 2007-02-02T14:03:04Z | |
dc.date.issued | 1996 | |
dc.identifier.uri | http://hdl.handle.net/1834/1464 | |
dc.description.abstract | This study was based on four seasonal cruises during 1984 and 1985. It revealed a thermo-haline frontal system formed by the advection of the Coastal Water mass flowing in two branches, one running towards the coast and the other mid-shelf directed. The thermocline developed between late spring and autumn results in a low inorganic nutrient concentration in the upper layer. Nonetheless in winter, a vertical homogeneity and high nutrient concentration were observed. Phytoplankton development presented a typical temperate-seas annual cycle. In winter, reduced populations were dominated by diatoms. The highest biomass concentration in the cycle coincided with the spring blooming, to which Thalassio sira anguste-lineata,Alexandrium tamarense, Heterocapsa triquetra and Prorocentrum micans were associated. Summer concentration decreased sharply with dinoflagellates being dominant, and a minor increase followed in autumn owing to diatom populations. Usually diatom growth was linked to the frontal region. The quali-quantitative flora composition denote this gulf as a southern transitional area with a dominance of temperate-cold communities. A high dinoflagellate cysts richeness and encystment were detected in spring. Trophic relations in the microplankton community were identified, and a spatial coupling of predator-dinoflagellates and photosynthetic prey-dinoflagellates was noted. Consumption and grazing and prey selectivity indexes were also estimated. | en |
dc.description.sponsorship | Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. | |
dc.format.extent | 1409859 bytes | |
dc.format.mimetype | application/pdf | |
dc.language.iso | es | |
dc.title | Estudios ecológicos en el Golfo San Jorge y adyacencias (Atlántico sudoccidental). Distribución, abundancia y variación estacional del fitoplancton en relación a factores físico-químicos y la dinámica hidrológica. | es |
dc.title.alternative | Ecological studies in San Jorge Gulf and adjacent areas (SW Atlantic). Phytoplankton distribution, abundance and seasonal variation in relation to physico-chemical factors and hydrology. | en |
dc.type | Theses and Dissertations | |
dc.description.notes | Tesis (Doctorado). Copia en PDF: portada, índice, resumen, referencias bibliográficas. | |
dc.description.other | fitoplancton , abundancia , relaciones tróficas , quistes , variación estacional , efectos ambientales | |
dc.format.pages | 234pp. | |
dc.subject.agrovoc | Phytoplankton | en |
dc.subject.agrovoc | Cysts | en |
dc.subject.asfa | Phytoplankton | en |
dc.subject.asfa | Abundance | en |
dc.subject.asfa | Trophic relationships | en |
dc.subject.asfa | Cysts | en |
dc.subject.asfa | Seasonal variations | en |
dc.subject.asfa | Seasonal thermocline | en |
dc.subject.asfa | Plankton surveys | en |
dc.subject.asfa | Environmental effects | en |
refterms.dateFOA | 2021-01-30T18:47:52Z |