Saúde do coral Siderastrea stellata e sua relação com variáveis ambientais em poças de maré do Rio Grande do Norte
Coastal reefs are valuable habitats for coastal communities, being responsible for coastal protection and to provide economic activities to the human community related to them. The coral Siderastrea stellata (Verrill, 1868) is the main shallow reef builder in Brazil, being common even in tide pools....
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| Formato: | bachelorThesis |
| Idioma: | pt_BR |
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Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/handle/123456789/47297 |
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| Resumo: | Coastal reefs are valuable habitats for coastal communities, being responsible for coastal protection and to provide economic activities to the human community related to them. The coral Siderastrea stellata (Verrill, 1868) is the main shallow reef builder in Brazil, being common even in tide pools. Monitoring coral health and its response to environmental dynamics is an important tool to understand the resilience of corals and how they might be affected by anthropogenic impacts. We monitored eleven colonies of S. stellata for two years since February 2017 at a tide pool in Natal-RN. The individuals were evaluated regarding paleness, bleaching, border contact, burying and mortality. Abiotic data such as temperature and light intensity were recorded in order to evaluate how they may affect coral health. During our study the colonies remained healthy for most of the time, except after extreme stress events caused by burying and increasing temperatures, which caused bleaching up to a 100% of the colonies. The burying events seem to be caused by wind direction that combined with the shoreline orientation may facilitate or not sediment deposition inside the tide pool. Additionally, burying may affect algae growing on the border of the coral colonies, decreasing their abundance and consequently benefitting coral colonies. Even though environmental variations caused stress to the colonies, they recovered their healthy color within 30 days, suggesting a high resilience of this species. This high resilience could indicate that coastal reefs may resist to global climate changes and to local abiotic variations that may affect them. |
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