Banca de DEFESA: JULIA PAULINA GUIMARÃES CAMILO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : JULIA PAULINA GUIMARÃES CAMILO
DATE: 23/07/2021
TIME: 14:00
LOCAL: meet.google.com/ogr-twvu-qxk
TITLE:

STONE CORALS’ RESPONSES TO ENVIRONMENTAL STRESSORS IN A MARINE PROTECTED AREA

KEY WORDS:

Biomarkers. Oxidative stress. Coral reefs. Marine Protected Area

PAGES: 60
BIG AREA: Ciências Exatas e da Terra
AREA: Oceanografia
SUMMARY:

Coral reefs are biodiversity rich environments important for the conservation and maintenance of other species in the reef community by providing food, protection, breeding sites and the provision of goods and services for the maintenance of traditional communities and the regional economy of human populations that depend on this system. In spite of it, reefs ecosystems have been suffering from global and local impacts worldwide. Here, we aim to test the following hypotheses: 1) reef zones open to human activities, such as fishing and tourism, have less coral cover than no-take zones, and 2) the level of activity of antioxidant enzymes is higher in open reef zones than in no-take zones. These hypotheses were tested by evaluating and characterizing the plume of rivers with outfall close to the reefs, calculating the percentage of benthic cover, and collecting samples of stone coral colonies, Mussismilia harttii (Verril 1868) e Siderastrea sp., for further analysis of the antioxidant activity of the enzymes Superoxide Dismutase (SOD), Catalase (CAT), and Glutathione-S-Transferase (GST), in addition to the levels of the Lipid peroxidation product, malondialdehyde (MDA), related to oxidative stress.  Sediment plume had no influence on the reefs studied here and the benthic cover showed differences between zones in terms of composition and abundance of functional groups, and greater similarity between the ZV and ZPVM. The coral cover was highest at ZV (9.33%). The CAT activity of M. harttii was higher in ZPVM than in other areas. For Siderastrea sp. the values were significantly different only between healthy and bleached colonies where bleached samples had highest GST enzyme activity and highest amounts of MDA produced. Both proposed hypotheses were rejected. It is concluded that tourism and fishing activities may not be the main stressors that influence the benthic community in these reefs.

BANKING MEMBERS:
Interno - 1265581 - LAZARO WENDER OLIVEIRA DE JESUS
Interno - 2269625 - ROBSON GUIMARAES DOS SANTOS
Externo à Instituição - IGOR CRISTINO SILVA CRUZ - UFBA