Banca de DEFESA: LOUIZE FREYRE DA COSTA CORREA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : LOUIZE FREYRE DA COSTA CORREA
DATE: 18/02/2020
TIME: 09:00
LOCAL: Sala de Reuniões do DECOL
TITLE:

3-D MONITORING OF CORAL HEALTH: COMPARISONS BETWEEN COASTAL AND OCEANIC REEFS

KEY WORDS:

Reef ecosystems;Siderastrea stellata;Montastraea cavernosa ;Anthropogenic Impacts;Local Dynamics;Coral Bleaching;Fernando de Noronha

PAGES: 40
BIG AREA: Ciências Biológicas
AREA: Ecologia
SUMMARY:

Due to their proximity to more populated areas, coastal reefs may be potentially more prone to the effects of anthropogenic impacts compared to oceanic reefs. In these environments, corals can respond more quickly to these impacts, with changes in their health status, depending on the species and environmental variables such as depth, temperature and exposure to light. Comparing the health of corals in coastal and oceanic environments, within the same latitudinal range, can provide information on how anthropogenic impacts and the natural dynamics of the environment affect these ecosystems. We monitor colonies of the Siderastrea stellata (~ 5m deep) and Montastraea cavernosa (~ 30m deep) corals on coastal (Rio Grande do Norte; ~ 5 ° S) and oceanic (Fernando de Noronha; ~ 3 ° S) reefs in northeastern Brazil. In these places, the species monitored are among the main coral reef builders. We monitor quarterly for one year (2018-2019), using three-dimensional models generated by photogametry. From the generated models, we evaluated coral health indicators (bleaching, mortality, diseases and algal overgrowth). Both monitored species showed good health in coastal and oceanic reefs throughout the year, with no record of intense bleaching during the monitored period. In one of the oceanic reef environments, we observed periods and greater bleaching related to the natural dynamics of this environment leading to the burial of the colonies. Colonies of S. stellata remained in general healthier in coastal areas than in the oceanics, which may be related to less exposure to light in coastal areas compared to ocean reefs due to greater water turbidity. The health status of M. cavernosa was stable and, despite having differences between coastal and oceanic areas, the corals in all monitored sites had, on average, 80% of their surface in a healthy state. The surface water temperature was also similar and relatively constant in coastal and oceanic reefs. Coral health was more affected by variations in the local ecosystem (e.g. natural burial) than by proximity to human impact, indicating that local temporal dynamics need to be considering when assessing the response of corals to human impacts.

BANKING MEMBERS:
Externa à Instituição - BÁRBARA SEGAL RAMOS - UFSC
Presidente - 2319234 - GUILHERME ORTIGARA LONGO
Interna - 2412921 - JULIANA DEO DIAS