Replacement of the compound ascidian species in a southeastern Brazilian fouling community

Rocha, Rosana M.

doi:10.1590/s0373-55241991000200005

Cited by 18 publications

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References 14 publications

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“…A lista de espécies de ascídias do Estado de São Paulo foi produzida principalmente a partir das seguintes referências bibliográficas: Van Name (1945), Bjornberg (1956), Millar (1958), Rodrigues (1962Rodrigues ( , 1966Rodrigues ( , 1977, Rocha (1988Rocha ( , 1991Rocha ( , 2004; Rocha & Monniot (1993, 1995, Rodrigues & Rocha (1993), Lotufo (1997), Rodrigues et al (1998Rodrigues et al ( , 1999, Dias & Rodrigues (2004), Dias et al (2006Dias et al ( , 2009), Lotufo & Dias (2007), Rocha & Bonnet (2009a, b). No entanto, algumas espécies constam apenas em coleções biológicas, estando tombadas no Museu de Zoologia da USP e na Tabela 1.…”

Section: Metodologiaunclassified

Checklist das ascídias (Tunicata, Ascidiacea) do Estado de São Paulo, Brasil

2011

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Ascidians are marine organisms that, for the most part, are found adhered to hard substrates from coastal to abyssal regions. Despite being chordates, their body plan is very modified to suit their life-style. In Brazil, ascidians are best studied in the State of São Paulo, both in terms of biodiversity and ecology. In that state, coastal waters of the municipality of São Sebastião are particularly well studied because the Marine Biology Research station of the University of São Paulo established there has attracted researchers since the 1960s. Knowledge of ascidians has been increasing continuously during the last 50 years, and today, 66 species are recorded from the state of São Paulo. Nonetheless, there are still important areas that need study, such as the extreme north and south in that state, where the ascidians have almost never been sampled, especially on the many coastal islands. Also, deeper regions of the continental shelf and slope are also poorly studied. Developing additional human resources is necessary for the continuity of biodiversity studies and today, no research group is studying ascidians in the State of São Paulo. Resumo: Ascídias são organismos marinhos que, em sua maioria, vivem fixados a substratos consolidados desde as regiões costeiras até às grandes profundidades. Apesar de serem cordados, apresentam um plano corporal adulto muito modificado em função de seu hábito de vida. O Estado de São Paulo é o que apresenta o melhor conhecimento da fauna de ascídias, tanto em termos de sua biodiversidade como em aspectos ecológicos. No estado, a região do município de São Sebastião foi a mais estudada em função da presença do Centro de Biologia Marinha da USP, que atraiu muitos pesquisadores desde a década de 1960. Nos últimos 50 anos houve um crescimento constante no conhecimento da fauna paulista de ascídias, que conta atualmente com 66 espécies registradas. No entanto, ainda existem lacunas importantes, pois o extremo norte e o litoral sul do estado ainda têm uma fauna de ascídias praticamente desconhecida, especialmente aquela relacionada às ilhas costeiras. As regiões mais profundas da plataforma continental e talude também foram pouco exploradas. Há necessidade de formação de recursos humanos para manter a continuidade dos estudos de biodiversidade, pois atualmente não existe nenhum grupo de pesquisa consolidado trabalhando com Ascidiacea no estado. Palavras-chave: Ascidiacea, biota paulista, Programa BIOTA/FAPESP.

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Section: Metodologiaunclassified

Checklist das ascídias (Tunicata, Ascidiacea) do Estado de São Paulo, Brasil

2011

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“…may act separately or jointly, from the stage of liberation of larvae up to their settlement, metamorphosis, and growth on substratum on ascidian biology (MILLAR, 1952(MILLAR, , 1958ROCHA, 1991;OSMAN & WHITLATCH, 1995a, b;RINKEVICH et al, 1998;ROCHA et al, 1999;FORWARD JR. et al, 2000;HADFIELD & PAUL, 2001).…”

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confidence: 99%

“…Except for species of the boreal region, where the majority of ascidians reproduces in short or moderately long periods in the summer (MILLAR, 1958), the ascidians of subtropical waters tend to show continuous reproductive periods, though gonadal activity are depressed during winter (ROCHA, 1991;ROCHA et al, 1999). In tropical waters with annual temperature variation of only 6 o C, GOODBODY (1961) reported continuous reproductive periods in solitary and colonial ascidians, with peaks of larval settlement not associated to any specific environmental factor.…”

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confidence: 99%

“…As the colonial ascidians are considered good competitors, dominant on hard substrata and rapid colonizers of artificial substrata (ROCHA, 1995;OREN & BENAYAHU, 1998), their larvae require clear spaces for colonization, whose speed of growth may occur according to each species (ROCHA, 1991;OREN & BENAYAHU, 1998). Although some ascidians species are able to induce the settlement and metamorphosis of larvae by urochordamine metabolite (HADFIELD & PAUL, 2001), the presence of adult colonies may affect the settlement, by usurpation of the primary substratum (OSMAN & WHITLACH, 1995a, b).…”

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confidence: 99%

“…Although some ascidians species are able to induce the settlement and metamorphosis of larvae by urochordamine metabolite (HADFIELD & PAUL, 2001), the presence of adult colonies may affect the settlement, by usurpation of the primary substratum (OSMAN & WHITLACH, 1995a, b). Recruitment and growth of ascidians have been particularly evaluated on artificial substrata (GOODBODY, 1961(GOODBODY, , 1962ROCHA, 1991;OSMAN & WHITLATCH, 1995a;OREN & BENAYAHU, 1998) or on natural ones (RINKEVICH et al, 1998;ROCHA et al, 1999), under conditions of continuous immersion. Although ascidians occur in the intertidal region usually attached to fixed substrata (RODRIGUES et al, 1998;GAMA et al, 2001), studies on their recruitment and colonization in such environment have not been reported in the literature.…”

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confidence: 99%

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Recruitment and colonization of colonial ascidians (Tunicata: Ascidiacea) on intertidal rocks in Northeastern Brazil

Gama

Leonel

Hernández

et al. 2006

Iheringia, Sér. Zool.

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ABSTRACT. Recruitment and colonization of colonial ascidians, starting on natural scraped substratum, was observed throughout one year, in quadrats marked on sea-and continental-rock faces in the sublittoral fringe of an exposed beach in the Northeast of Brazil. The species of the Didemnidae, Didemnum duplicatum Monniot, 1983, D. psammathodes Sluiter, 1895, and Polysyncraton amethysteum Van Name, 1902, and an unidentified species of Polycitoridae, Eudistoma sp. 1, were recruited. Presenting continuous recruitment of all species, the density of living and dead recruits and colonies was similar on both faces of the rocks. The highest rainfall during winter, affected significantly the recruits density of D. duplicatum and D. psammathodes. Different permanence periods were observed for colonies of each species. The longest permanence periods were assigned to the colonies of P. amethysteum and D. psammathodes, extending up to four and five months, respectively.

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