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.
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.
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Format: | Theses and Dissertations biblioteca |
Language: | Spanish / Castilian |
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1996
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Subjects: | Phytoplankton, Cysts, Abundance, Trophic relationships, Seasonal variations, Seasonal thermocline, Plankton surveys, Environmental effects, |
Online Access: | http://hdl.handle.net/1834/1464 |
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dig-aquadocs-1834-14642021-05-19T06:25:04Z 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. 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. Akselman, R. Carreto, J.I. Phytoplankton Cysts Phytoplankton Abundance Trophic relationships Cysts Seasonal variations Seasonal thermocline Plankton surveys Environmental effects 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. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Tesis (Doctorado). Copia en PDF: portada, índice, resumen, referencias bibliográficas. fitoplancton , abundancia , relaciones tróficas , quistes , variación estacional , efectos ambientales 2007-02-02T14:03:04Z 2007-02-02T14:03:04Z 1996 Theses and Dissertations http://hdl.handle.net/1834/1464 es 1409859 bytes application/pdf 234pp. Argentina , Patagonia , Santa Cruz , Golfo San Jorge |
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Phytoplankton Cysts Phytoplankton Abundance Trophic relationships Cysts Seasonal variations Seasonal thermocline Plankton surveys Environmental effects Phytoplankton Cysts Phytoplankton Abundance Trophic relationships Cysts Seasonal variations Seasonal thermocline Plankton surveys Environmental effects |
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Phytoplankton Cysts Phytoplankton Abundance Trophic relationships Cysts Seasonal variations Seasonal thermocline Plankton surveys Environmental effects Phytoplankton Cysts Phytoplankton Abundance Trophic relationships Cysts Seasonal variations Seasonal thermocline Plankton surveys Environmental effects Akselman, R. 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. |
description |
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. |
author2 |
Carreto, J.I. |
author_facet |
Carreto, J.I. Akselman, R. |
format |
Theses and Dissertations |
topic_facet |
Phytoplankton Cysts Phytoplankton Abundance Trophic relationships Cysts Seasonal variations Seasonal thermocline Plankton surveys Environmental effects |
author |
Akselman, R. |
author_sort |
Akselman, R. |
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. |
title_short |
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. |
title_full |
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. |
title_fullStr |
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. |
title_full_unstemmed |
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. |
title_sort |
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. |
publishDate |
1996 |
url |
http://hdl.handle.net/1834/1464 |
work_keys_str_mv |
AT akselmanr estudiosecologicosenelgolfosanjorgeyadyacenciasatlanticosudoccidentaldistribucionabundanciayvariacionestacionaldelfitoplanctonenrelacionafactoresfisicoquimicosyladinamicahidrologica AT akselmanr ecologicalstudiesinsanjorgegulfandadjacentareasswatlanticphytoplanktondistributionabundanceandseasonalvariationinrelationtophysicochemicalfactorsandhydrology |
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1756075477542371328 |