Banca de DEFESA: FELIPE DE OLIVEIRA FERNANDES

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : FELIPE DE OLIVEIRA FERNANDES
DATE: 30/07/2021
TIME: 14:00
LOCAL: meet.google.com/hdo-aykb-vok
TITLE:

Seaweed structural complexity and chemical composition as structuring factors of the associated fauna


KEY WORDS:

Morphology, Habitat choice, Food choice, Chemical cues, Seaweed-herbivore interaction, Predation, Amphipoda



PAGES: 78
BIG AREA: Ciências Biológicas
AREA: Ecologia
SUMMARY:

Seaweeds play several roles for associated fauna (shelter from predation and/or stressful abiotic conditions, substrate, food and sediment retention). In this context, this work was divided into three chapters to investigate how the structural complexity of different seaweeds may affect ecological aspects of the associated fauna (richness, density, diversity and composition) and which role seaweed complexity and chemical composition play on habitat and food choice by their fauna as well as predation. In the first chapter, the influence of seaweed structural complexity was analyzed based on ecological aspects of the fauna associated with six species of seaweeds. The ecological aspects were evaluated considering the fractal area (spaces between branches), the fractal perimeter (contour level) and the volume of seaweeds. Halimeda opuntia had the highest values of richness and diversity. Dictyopteris delicatula harbored the highest density. Regarding faunal composition, H. opuntia and Gelidium coarctatum had the most distinct communities. In the second chapter, experiments were carried out to assess the choices (food, habitat and chemical cues) by amphipods concerning different species of seaweeds. Gracilaria cervicornis was the most consumed seaweed among the species offered. Moreover, in the experiments of chemical cues (mimics with and without algal extracts), the amphipods were attracted only by those with extracts of G. cervicornis. These results indicate that amphipods are likely attracted by chemical cues from G. cervicornis as they serve primarily as a food source. In the third chapter, experiments were carried out to determine whether the seaweed choice by amphipods is influenced by predators based on chemical cues. The amphipods preferred D. delicatula cues over G. cervicornis and G. coactatum cues, but switched their choice to G. cervicornis when predator cues were added to D. delicatula cues and remained in G. cervicornis even when predator cues were added compared to G. coarctatum cues. These results demonstrate that, although they prefer some seaweeds, amphipods are able to adapt their behavior based on predator chemical cues.



BANKING MEMBERS:
Presidente - 1279472 - ELIANE MARINHO SORIANO
Interna - 2412921 - JULIANA DEO DIAS
Externo ao Programa - 363.178.178-47 - EDSON APARECIDO VIEIRA FILHO - UFRN
Externa à Instituição - THELMA LÚCIA PEREIRA DIAS - UEPB
Externo à Instituição - VINICIUS PERUZZI DE OLIVEIRA - UFRJ
Notícia cadastrada em: 29/07/2021 12:17
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