Banca de QUALIFICAÇÃO: JÚLIA PERES RAMALHO

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
DISCENTE : JÚLIA PERES RAMALHO
DATA : 23/05/2022
HORA: 09:30
LOCAL: Remota
TÍTULO:

ECOLOGICAL INTERACTIONS IN MARINE SPONGE COMMUNITIES ON THE COAST OF THE STATE OF SÃO PAULO

PÁGINAS: 24
GRANDE ÁREA: Ciências Biológicas
ÁREA: Ecologia
RESUMO:

Ecological interactions contribute to the resilience and biodiversity of ecosystems. The activities that organisms perform within a community, from the beginning of their formation to the interactions that maintain them, such as nutrient availability and predation, result in different compositions of communities. Marine sponges (Phylum Porifera), filtering and sessile animals, are organisms described as a source of food, refuge and habitat for other marine species. Sponge diversity in some communities is structured through predation (top-down) while in others diversity is maintained through nutrient availability (bottom-up). Another important point to consider when talking about community structure is the priority effect, that is, the first colonizers of the community may change the environment and subsequent colonization, resulting in divergent communities depending on who arrives first at the place. . To test how initial colonization and predation affect community structure, we used three species of marine sponges, two chemically defended (Aplysina fulva and Amphimedon viridis) and one without chemical defense (Mycale angulosa). Sixty PVC plates were placed in the field, fixed vertically in PVC structures and placed on the ocean floor near the south coast of Praia do secreto, where sponges are common components of the community. These plates were divided into 3 groups, each group being initially colonized by one of the three sponge species. Among the 20 PVC plates of each species, half were kept without any protection against predation, while in the remaining half the plates were protected by a cage. Thus, it was possible to evaluate two factors: (1) how predation affects the growth of each sponge species, and (2) the diversity of the community founded by different sponge species. Predation did not affect the growth of any of the three sponge species, suggesting that this factor is not determinant in the occurrence of the three species (p>0.05). Similarly, the community structure was not affected by predation, being only determined by the colonizing sponge species (p<0.05). We found that the communities of the three sponge species investigated here were not controlled by predation. In addition, the founding sponge species was primarily responsible for the adjacent community.

MEMBROS DA BANCA:
Presidente - Interno ao Programa - 289.117.248-58 - CRISTIANE CASSIOLATO PIRES HARDOIM - UNIP
Membro Titular - Examinador(a) Interno ao Programa - 366.099.678-57 - RAFAEL CAMPOS DUARTE - USP
Membro Titular - Examinador(a) Externo à Instituição - EDSON APARECIDO VIEIRA FILHO - UFRN
Membro Suplente - Examinador(a) Externo à Instituição - MÁRCIO REIS CUSTÓDIO - USP
Membro Suplente - Examinador(a) Externo à Instituição - FERNANDO RAFAEL DE GRANDE - UNIFESP