Banca de QUALIFICAÇÃO: HENRIQUE BEZERRA DOS SANTOS

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : HENRIQUE BEZERRA DOS SANTOS
DATE: 12/02/2024
TIME: 14:00
LOCAL: https://conferenciaweb.rnp.br/sala/Quali-Henrique
TITLE:

REEF ECOSYSTEMS IN TRANSITION: STUDYING PHASE CHANGE AND ITS IMPLICATIONS FOR FISH ASSEMBLAGES, CLEANING AND COVER SYMBIOSIS AND CORAL RECRUITMENT

KEY WORDS:

trophic-group; composition; degradation; zoanthid; macroalgae

PAGES: 45
BIG AREA: Ciências Biológicas
AREA: Ecologia
SUMMARY:

Degraded reefs can evolve into a condition called "phase shift" (PS). In these cases, the reef becomes dominated by a non-coral biological group, and there is a change in energy patterns within the ecosystem due to the unavailability of resources to fish. In this context, we evaluated the effects of PS on fish assemblages for three different conditions: non-degraded and PS by algae and by zoanthids in a reef complex (12 reefs) in Todos os Santos Bay. The richness observed was (44) "PS by zoanthid," followed by non-degraded reefs (41), and "MF by macroalgae" (21). The abundance per condition was significantly different (ANOVA p<0.05). Tukey's test indicated that the PS reefs had similar abundance (P=0.994), with both being significantly lower than the non-degraded condition. The abundance by trophic category showed a significant difference, with Invertivores predominating in all three conditions, with the highest abundance of individuals in this category being observed in the non-degraded reefs; this condition also showed a higher abundance of Omnivores, and for other trophic categories, it did not differ significantly from the other reef conditions. PS reefs with algae did not have the presence of any cephalopod-eating, fish-eating, or plankton-eating species; it differed from the other two conditions and had the lowest abundance of Macroalgae Herbivores. The SIMPER analysis indicated that ten species (mostly invertivorous/omnivorous) represented more than 70% of the similarity for the contrasts tested. Haemulon aurolineatum contributed more than 20% of the similarity in all cases, followed by Haemulon steindachneri and Serranus flaviventris. The low richness of macroalgae reefs reflects the loss of essential ecosystem functions such as habitat complexity; the low abundance of herbivorous fish may be a consequence of the predominance of unpalatable algae. The prevalence of invertivores may indicate that the assemblages of altered reefs are more dependent on secondary than primary productivity.

COMMITTEE MEMBERS:
Presidente - 2997144 - IGOR CRISTINO SILVA CRUZ
Externo à Instituição - RAFAEL MENEZES - UFRPE
Externa à Instituição - KARINA MASSEI - UFPB