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Master's Dissertation
DOI
10.11606/D.21.2013.tde-09042014-194321
Document
Author
Full name
Michele Quesada da Silva
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2013
Supervisor
Committee
Vanin, Ana Maria Setubal Pires (President)
Paiva, Paulo Cesar de
Prado, Paulo Inácio de Knegt López de
Title in Portuguese
Biodiversidade e modelagem estatística da comunidade de poliquetas de fundos inconsolidados do complexo recifal Sebastião Gomes, Banco dos Abrolhos (BA, Brasil)
Keywords in Portuguese
Banco dos Abrolhos
hotspot
modelos lineares generalizados
Polychaeta
recife Sebastião Gomes
Abstract in Portuguese
Embora recifes de coral sejam hotspots de biodiversidade para corais e peixes, não se sabe se são para pequenos invertebrados marinhos. Este estudo visou verificar se o complexo recifal Sebastião Gomes é um hotspot de biodiversidade de poliquetas, bem como caracterizar a comunidade estrutural e funcional desses organismos que habitam o sedimento ao redor do recife. Através de modelos lineares generalizados (glm), tendo como variáveis preditoras características do sedimento e/ou posicionamento das estações de coleta ao redor do recife (transectos perpendiculares às faces sul, oeste, norte e leste), buscou-se compreender os padrões de: diversidade alfa; abundância total de poliquetas; abundância das espécies mais representativas; e abundância dos diferentes hábitos tróficos. Foram coletados 2399 indivíduos identificados em 116 espécies, indicando que Sebastião Gomes pode ser um hotspot. Todos descritores da comunidade foram maiores próximos ao recife, onde predominaram sedimentos grossos e carbonáticos. Já a posição ao redor do recife foi importante apenas para alguns descritores, tais como abundância total e dos hábitos tróficos carnívoros e detritívoros, todos maiores nos transectos norte e leste, expostos aos ventos. A abundância de poliquetas foi mais baixa em todo transecto sul, mais suscetível à ressuspensão de sedimento causada pelas frentes frias que atingem essa região
Title in English
Biodiversity and statistical modeling of polychaete community in soft bottom of Sebastião Gomes reef complex, Abrolhos Bank (BA, Brazil)
Keywords in English
Abrolhos Bank
generalized linear models
hotspot
Polychaeta
Sebastião Gomes reef
Abstract in English
Although coral reefs are biodiversity hotspots for corals and fishes, it is not known whether they are also for small marine invertebrates. The present study aimed to verify if Sebastião Gomes reef complex is a polychaete biodiversity hotspot, as well to describe the structural and functional community of these organisms which inhabit sediments around the reef. Generalized linear models (glm) with sediment features and station position around the reef (perpendicular transects to the South, West, East and North faces) as predictor variables were used to understand the patterns of: alpha diversity; total polychaete abundance; most representative species abundance; and abundance of different trophic habits. 2399 individuals identified in 116 species were collected, indicating that Sebastião Gomes may be a hotspot. All community descriptors were higher near the reef, where coarse and carbonate sediments preponderate. However, the position around the reef was important only for some descriptors, such as total abundance and abundance of carnivorous and deposit feeders. All of them higher in the North and East transects, that are exposed to wind. The polychaete abundance was lower in the whole South transect, nevertheless it is more susceptible to sediment resuspension caused by cold fronts that reach the region
 
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Publishing Date
2014-04-29
 
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