Populações de Chthamalus spp. em costões rochosos da baía da ilha Grande (RJ) e suas relações com o clima entre 2002 e 2012

• Autor(a) principal: Cortez, Pedro Sant'anna
• Data de Publicação: 2014
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da UERJ
• Texto Completo: http://www.bdtd.uerj.br/handle/1/13891
• topic: Bamacles; Biological variables; Environmental variables; Thermal stress; Cirripédios; Variáveis biológicas; Variáveis ambientais; Estresse térmico; CNPQ::CIENCIAS EXATAS E DA TERRA::OCEANOGRAFIA::OCEANOGRAFIA BIOLOGICA

Few organisms are able to withstand high stress caused by temperature variations and high desiccation in the upper limit of the intertidal zone of rocky shores, as the barnacle Chthamalus. Despite their resistance, these organisms constantly live near their physiological tolerance limit, which influence their populations. The aim of this study was to characterize the fluctuations of Chthamalus spp. populations in the upper zone of four intertidal rocky shores in Ilha Grande Bay between 2002 and 2012, relating these changes to the environmental factors of air temperature, sea surface temperature and precipitation, verifying the potential of these organisms as indicators of climatic variations. For that the air temperature and precipitation were investigated using data from the meteorological station of Angra dos Reis and sea surface temperature from satellite images (MODIS/AQUA), in addition to the coverage percentages of Chthamalus spp. from seasonal samplings. In general the study indicates that populations were influenced by the biological variables recruitment and intraspecific competition. Large differences were found between the fluctuations on the rocky shores studied. The station C1, showed high coverage of barnacles and young adults throughout almost the entire period of study. At the station C2 occurred the largest variations, while in C3 and C4 stations have ocurred the smaller coverages and less prominent variations. These differences were probably related to the physical characteristics of each rocky shore. The years 2003 and 2010 were characterized as high temperature yeras (temperatures of sea and air) when compared to the other years of study. These years were also characterized by the occurrence of El Niño, with high thermal anomalies, indicating that this climatic phenomenon influenced the temperatures in the region. In these same years the coverage of Chthamalus spp. were relatively low, indicating that heat stress affected the populations of this cirripédio. Is possible infer from this study that the cirripédio Chthamalus spp. is under direct influence of environmental factors investigated, being, with that, a potential indicator of climate change.