Banca de QUALIFICAÇÃO: OTAVIO CESAR MARCHETTI

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
DISCENTE : OTAVIO CESAR MARCHETTI
DATA : 10/09/2021
HORA: 14:00
LOCAL: por participação remota
TÍTULO:

The construction of artificial habitats can reduce the impacts of coastal construction on the benthic communities?

PÁGINAS: 35
GRANDE ÁREA: Ciências Biológicas
ÁREA: Ecologia
RESUMO:

Coastal constructions such as piers, marinas and ports promote the fragmentation and loss of natural habitats, replacing complex and heterogeneous habitats with flat, two-dimensional concrete walls. The modification of habitats associated with low water circulation affects the dynamics of the benthic community, reducing refugia against predation, and then the identity of the dominant species. The modification of the community structure will consequently change the availability of reproductive propagules in the plankton, affecting the dynamics of recruitments in communities from natural habitats nearby. In this work, I used simple and complex substrates coupled to a recruitment plate for the development of the sessile community subjected to two predation treatments in a marina from southeastern Brazil. I evaluated how habitat complexity affected the abundance of each taxonomic group, estimated by dry weight and number of individuals after 8 and 18 months of community development and how communities of simple and complex substrates differ in the number and identity of larvae produced. In the recruitment plates associated with each substrate, I quantified species coverage to identify whether any difference in the nearby larval pool influences the recruitment of an adjacent area when the community develops exposed or protected against predators. Complex substrates showed a greater abundance of solitary organisms, mainly ascidians and bivalves, while simple substrates were dominated by barnacles and colonial organisms such as encrusting bryozoans. This difference affected the larval pool produced by the communities as a consequence of the dominant organisms. However, this difference in larval production was not enough to change the structure of the community around these substrates. My results indicate that communities in anthropized environments are under the influence of intense top-down control, where predation can suppress eventual differences in recruitment, reducing the effects promoted by substrate manipulation. However, my results also indicate that the homogenization of substrates tends to select few functional attributes, especially coloniality and structural defenses as a predation escape strategy. 

MEMBROS DA BANCA:
Presidente - Interno ao Programa - 1768895 - GUSTAVO MUNIZ DIAS
Membro Titular - Examinador(a) Interno ao Programa - 1762351 - NATALIA PIRANI GHILARDI LOPES
Membro Titular - Examinador(a) Externo à Instituição - EDSON APARECIDO VIEIRA FILHO - UFRN
Membro Suplente - Examinador(a) Interno ao Programa - 1763449 - FERNANDO ZANIOLO GIBRAN
Membro Suplente - Examinador(a) Externo à Instituição - GUILHERME ORTIGARA LONGO - UFRN