Fitoplancton de un ambiente costero sometido a perturbación antrópica: Bahía Nueva, provincia de Chubut
One of the main antrophic contamination problems on coastal environments is associated directly with the increasing amount of nutrients carried by the rivers and by urban runoff, which can hold a great number of microbial and algae population. This problem called sea coast eutrophication, stimulates primary production and in more severe cases leads to visible algae blooms, algae foams, excessive growth of benthic algae and massive population of submerged and floating macrophytes. It has been demonstrated that cases of algae blooms and associated toxicity affecting marine biota and people often occur on euthrophic coastal areas. The main goal of this research was first to analyze the structure and dynamics of phytoplankton, pointing out those harmful species along the coastal environment of the Chubut province (Argentina), such as Bahia Nueva, in Golfo Nuevo which is subjected to anthrophic disturbance of the community under research. Secondly, to carry out laboratory experiences about the effect of enriched nutrients and the effect of interespecific competition with nitrogen compounds. The net samples of phytoplankton community were characterized by coastal environment species, many of them reported in eutrophic coastal environments and others belonging to oceanic habitat. Harmful algae blooms producing biotoxins were detected with maximum abundances on the coastal zone. The whole Bay showed different degrees of impact of some phytoplankton species and it was demonstrated through laboratory experiences that different environmental conditions favored specific phytoplankton development. The results obtained -taking into account the environmental terms of references in the whole Bay- showed a temporal evolution associated to natural phenomena rather than entropic/ human impact. Regarding the variations in algae groups there are evidences of changes in the composition of algae groups that correspond to temperate coastal ecosystems. The growing algae blooms has become a global concern causing serious health problems and in some cases they have led to death. In spite of being a natural phenomena , the algae blooms have become a matter of Public Health , hence it is necessary to develop a system that can provide a continuing record so as to detect in time the algae blooms and in this way to reduce possible damages. The population growth, the gradual coastal eutrophication and the global climatic changes are factors that foster these phenomena. That is why it is urgent to keep a regular control of the phytoplankton along the sea coast, mainly in those areas that receive an increasing number of tourists every season and/or are affected by the development of industries related to the sea.
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| Format: | Theses and Dissertations biblioteca |
| Language: | Es Spanish / Castilian |
| Published: |
2008
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| Subjects: | Fitoplancton, Eutroficación, Floraciones, Composición de la comunidad, Condiciones ambientales, Bioensayos, Salud pública, Zona costera, Phytoplankton, Eutrophication, Bioassays, Public health, Algal blooms, Environmental conditions, Community composition, Coastal zone, |
| Online Access: | http://hdl.handle.net/1834/3547 |
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