文章基本信息

标题：Effects of disturbance area on fouling communities from a tropical environment: Guanabara Bay, Rio de Janeiro, Brazil
其他标题：Effects of disturbance area on fouling communities from a tropical environment: Guanabara Bay, Rio de Janeiro, Brazil
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作者：Xavier, Eduardo de Almeida ; Gama, Bernardo Antonio Perez da ; Porto, Tiago Filgueiras 等
期刊名称：Brazilian Journal of Oceanography
印刷版ISSN：1679-8759
电子版ISSN：1982-436X
出版年度：2008
卷号：56
期号：2
页码：73-84
DOI：10.1590/S1679-87592008000200001
出版社：Instituto Oceanográfico da Universidade de São Paulo
摘要：In marine fouling communities, free space is one of the key limiting resources for settlement of new organisms. In this way, removing biomass through physical disturbances would play an important role in the structure and dynamics of these communities. The disturbance size seems to be a characteristic that influences recolonization patterns, thus affecting species diversity. The aim of this study was to analyze the effects of growing disturbance areas on fouling communities. Fouling panels were allowed to develop for 6 mo. at Guanabara Bay (22°52'S, 043°08'W) prior to a single application of randomly positioned, circular physical disturbances of growing areas (7 levels, from 0 to 75% removed cover, 10 replicates per treatment). Samples were taken fortnightly after the disturbance event, so as to follow the development patterns of the community afterward. At the first sampling the diversity showed maximum indices in communities to which intermediary disturbance levels were applied. However, this profile changed later to a diversity peak in communities with higher disturbance levels. It also showed a continuous increase in richness and diversity through time until the 7th sample (110 days after the disturbance event), with subsequent decrease. Such patterns seem to corroborate the Intermediate Disturbance Hypothesis, despite the drastic profile change with time, revealing that disturbance is indeed an important factor structuring hard bottom communities at Guanabara Bay, and highlighting the importance of longer term studies of disturbance impacts in marine communities.
关键词：Distúrbio físico;Comunidade incrustante;Área de distúrbio;Hipótese do Distúrbio Intermediário (HDI);Diversidade;Baía de Guanabara
其他关键词：Physical disturbance;Fouling community;Disturbance area;Intermediate Disturbance Hypothesis (IDH);Diversity;Guanabara Bay