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Universidade Estadual da Paraíba (UEPB) 2013

Fatores estruturantes das comunidades de invertebrados planctônicos e bentônicos como ferramenta para o biomonitoramento de reservatórios no semiárido

Azevêdo, Daniele Jovem da Silva

Titre : Fatores estruturantes das comunidades de invertebrados planctônicos e bentônicos como ferramenta para o biomonitoramento de reservatórios no semiárido

Auteur : Azevêdo, Daniele Jovem da Silva

Université de soutenance : Universidade Estadual da Paraíba (UEPB)

Grade : Mestrado em Ecologia e Conservação 2013

Résumé partiel
The extensive degradation on freshwater ecosystems has led to the development of tools for monitoring and actions mitigation of impacts. The tools based on biological indicators have been widely developed and applied, as it allows greater accuracy in obtaining the actual picture of the ecological quality of the ecosystem, when compared to traditional methods. Thus, the goal of this dissertation is to establish, among the factors structuring (abundance, richness, diversity and biomass) communities of planktonic and benthic invertebrates, which could compose biomonitoring tool for the ecological quality of the reservoirs in the semiarid region. For this were : i) analyzed aspects of abundance, richness, diversity and biomass of planktonic and benthic invertebrates ii) drivers related factors (physical, chemical and biological) for each of the structural aspects evaluated iii) identified the response each structural aspect (abundance, richness, diversity and biomass) in relation to environmental factors tested, reflects the ecological condition of the ecosystem and iv) related factors structuring which could be used as a tool for biomonitoring of reservoirs inserted in semi-arid climate. Our hypothesis is that the biomass among the factors structuring (abundance and diversity) of invertebrate communities is the best biological indicator for assessing the quality of reservoirs in the semiarid region, in view of sensitivity to variables related to anthropogenic influences (loading nutrient) composition and physical structure of the habitat. Data were collected in the reservoir and Poções and Camalaú, both located on the upper course of the river Paraíba, Paraíba, Brazil. Samplings were made fortnightly in two hydrological periods in 2012 : April (dry season in the region) and June (rainy season in the region). In each shell collections occurred in two seasons, being : Station 1 - near the entrance of the main tributary (Paraíba river) and Station 2 - next to dam of the reservoir and, at each station, samples were collected from water, sediment and submerged plants to compose the set of environmental variables, in addition to performing the experiment in the primary productivity of phytoplankton as biological variable. Zooplankton samples were collected by filtering 25 liters of water, plankton net, and macroinvertebrate samples were obtained from the collection of the sediment with the assistance collector Ekman-Birge. The data set shows that the distribution of abundance, richness, diversity and biomass of planktonic communities and benthic invertebrates occur similarly front environmental variables, but that there are different patterns of distribution of structural features between the reservoirs Poções and Camalaú, between limnetic and littoral zone and between the dry and rainy periods, so as that the environmental variables acting on spatial scale (between reservoirs), the compartments of reservoirs (littoral and pelagic) and seasonal scale (period of lesser and greater volume the reservoirs), suggesting that the tools for biomonitoring of these bodies of water these scales of variation.

Mots Clés : Biomonitoramento Ecologia Ecossistemas aquáticos

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Page publiée le 15 août 2017