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SECONDARY SUCCESSION ON AN EXPOSED ROCKY INTERTIDAL ALGAL COMMUNITY OF THE STATE OF SÃO PAULO — BRAZIL

ÉDISON JOSÉ DE PAULA and VERENA RAPP DE ESTON
Boletim de Botânica da Universidade de São Paulo
Vol. 11 (1989), pp. 1-9
Stable URL: http://www.jstor.org/stable/42871938
Page Count: 9
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
SECONDARY SUCCESSION ON AN EXPOSED ROCKY INTERTIDAL ALGAL COMMUNITY OF THE STATE OF SÃO PAULO — BRAZIL
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Abstract

Succession was studied at the low intertidal level of an exposed rocky shore at Ponta da Fortaleza, Ubatuba, State of São Paulo, where Sargassum cymosum var. nanum is the dominant alga. Experimental areas were scraped throughout the year and the successional sequences were observed. S. cymosum var. nanum is a perennial seaweed, an attribute of a biotically competent strategist. Nevertheless, this Sargassum cymosum variety is dwarf and exhibits precocious reproductive development, characteristic of opportunistic species. Succession in this community was maintained in its earlier stages both at control and experimental sites, due to desiccation stress, which causes widespread algal mortality at early summer. Foi estudada a sucessão no nível inferior da região entre-marés em um costão rochoso exposto à ação das ondas, no litoral de São Paulo (Ponta da Fortaleza, Ubatuba). Neste costão, Sargassum cymosum var. nanum é a alga dominante. Áreas experimentais foram raspadas ao longo do ano onde foi observada a seqüência sucessional. S. cymosum var. nanum é uma espécie perene, característica de organismos sucessionais tardios. No entanto, esta variedade é anã e apresenta desenvolvimento reprodutivo precoce, característica de espécies oportunistas. Nesta comunidade a sucessão é mantida nos estágios iniciais, tanto nas áreas experimentais como nas áreas controle, devido à dessecação, que causa grande mortalidade de algas no início do verão.

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