Banca de QUALIFICAÇÃO: NATÁLIA CARVALHO ROOS

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
DISCENTE : NATÁLIA CARVALHO ROOS
DATA : 15/03/2019
HORA: 14:00
LOCAL: Sala de reuniões do DECOL.
TÍTULO:

Brazilian parrotfishes: from assemblages to individuals 

PALAVRAS-CHAVES:

Habitat preference; reef fish; endemics; Southwestern Atlantic; management; demography

PÁGINAS: 80
GRANDE ÁREA: Ciências Biológicas
ÁREA: Ecologia
RESUMO:

Parrotfishes may affect the structure of benthic communities and reef ecosystem functioning. Despite being extensively studied worldwide, parrotfishes in Southwestern Atlantic are relatively understudied and critical information to understand their functional roles is scarce. The abundance, biomass and size class distribution of parrotfish assemblages in Northeast Brazil were assessed and habitat preferences were identified based on reef attributes. Benthic cover, reef structural complexity, depth and distance from the coast affected the composition of parrotfish assemblages, but had different effects on each species. The occurrence, abundance and biomass of the endemic greenbeak parrotfish Scarus trispinosus were associated to calcareous substrates and higher-complexity reefs. Sc. zelindae and Sparisoma amplum were more common in deeper biogenic reefs further from the coast, covered by sponges, stony corals and cyanobacterial mats. Sp. axillare and Sp. radians were associated to reefs with high cover of large-bladed macroalgae, while Sp. frondosum was conspicuous across all the studied reefs. Outer-shelf reefs sustained larger-sized individuals and higher biomasses of all species (except for Sp. radians), while inner-shelf reefs concentrated higher abundances of small-sized individuals. This may result from juvenile parrotfish preferring shallow inshore reefs as nursery areas, but also from fishing activities depleting larger-sized individuals in more coastal reefs. Habitat preferences of bioeroder excavating parrotfishes (Sp. amplum and Sc. trispinosus) differed from the grazing sparisomatines, likely because of their different nutritional targets and grazing capacity. Our results that: (1) functional role of parrotfishes in structuring benthic communities is variable and potentially predicted by reef attributes; (2) there may be more complementarity than redundancy occurring among the Brazilian endemic parrotfish; and (3) inshore and offshore reefs may be distinct with respect to maturation schedules and rates of mortality, what should be taken in account in management planning. Conservation of Brazilian endemic parrotfishes requires protecting reefs with diverse attributes, including the protection of inshore reefs that are potentially nurseries habitats.

 

MEMBROS DA BANCA:
Presidente - 1803589 - ADRIANA ROSA CARVALHO
Externo ao Programa - 000.000.000-00 - ANTOINE LEDUC - UFRN
Externo ao Programa - 363.178.178-47 - EDSON APARECIDO VIEIRA FILHO - UFRN
Interno - 2319234 - GUILHERME ORTIGARA LONGO