Publications by authors named "Giulia Burle Costa"
Given the ecological and biogeochemical importance of rhodolith beds, it is necessary to investigate how future environmental conditions will affect these organisms. We investigated the impacts of increased nutrient concentrations, acidification, and marine heatwaves on the performance of the rhodolith-forming species Lithothamnion crispatum in a short-term experiment, including the recovery of individuals after stressor removal. Furthermore, we developed an ecological niche model to establish which environmental conditions determine its current distribution along the Brazilian coast and to project responses to future climate scenarios.
View Article and Find Full Text PDFThe damages of Mariana's mining mud in the physiology of the brown algae Sargassum cymosum and its main epiphytic, the red algae Hypnea pseudomusciformis, were evaluated by controlled essays. Seaweeds were exposed to presence or absence of mud, isolated or in biological association, for 5 and 15 days. Measured parameters were growth rates, biochemical descriptors, and the chemical investigation of concentration and metal profile of the mud dissolved in seawater.
View Article and Find Full Text PDFArticle Synopsis
- Marine bioinvasions are on the rise due to factors like increased ship traffic and climate change, making it crucial to identify species like Grateloupia turuturu that pose significant invasive threats.
- Researchers developed an ecological niche model and conducted experiments to assess G. turuturu's potential global distribution and invasion risk, highlighting its suitability in temperate regions where it hasn't yet spread.
- The findings emphasize the need for management strategies to prevent its spread, particularly in South America, and suggest that this approach can also help evaluate other marine invasive species.
Article Synopsis
- Radiation, including PAR and UVR, significantly influences the distribution of algal species in aquatic environments, particularly between native Pyropia acanthophora and exotic Grateloupia turuturu in Southern Brazil.
- The study tested various light conditions on these species to evaluate their physiological responses, finding that G. turuturu was especially vulnerable to UV radiation and did not survive under PAB conditions.
- Results showed that P. acanthophora had a more favorable physiological response, producing more chlorophyll and maintaining stable phycoerythrin levels, indicating its competitiveness and potential for survival in its natural habitat despite the presence of the invasive G. turuturu.
The effects of the heavy metals copper (Cu) and lead (Pb) on Sargassum cymosum were evaluated by determining uptake capacity, growth rates, photosynthetic efficiency, contents of photosynthetic pigments and phenolic compounds, 2,2-diphenyl-1-picrylhydrazyl radical-scavenging capacity, and morphological and cellular changes. S. cymosum was cultivated with Cu and Pb separately and combined at concentrations of 10, 25, and 50 μM for 7 days in laboratory-controlled conditions.
View Article and Find Full Text PDFBy evaluating carotenoid content, photosynthetic pigments and changes in cellular morphology, growth rates, and photosynthetic performance, this study aimed to determine the effect of cadmium (Cd) on the development of young gametophytes of Gelidium floridanum. Plants were exposed to 7.5 and 15 μM of Cd for 7 days.
View Article and Find Full Text PDFGelidium floridanum W.R. Taylor tetraspores are units of dispersal and are responsible for substrate attachment.
View Article and Find Full Text PDF