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Artigo de periodico

A new encrusting interstitial marine fauna from Brazil (2005)

  • Authors:
  • Autor USP: MIGOTTO, ALVARO ESTEVES - CEBIMAR
  • Unidade: CEBIMAR
  • DOI: 10.1111/j.1744-7410.2005.1241-10.x
  • Subjects: BRYOZOA; SEDIMENTOLOGIA MARINHA
  • Language: Inglês
  • Abstract: This paper reports the second occurrence of a sand-grain encrusting interstitial epifauna dominated by bryozoans and polychaetes at a site thousands of kilometers from the first described occurrence of such a fauna 20 years ago. Such faunas seem to have gone almost unrecorded in the marine ecological literature, but they are potentially geographically widespread and ecologically significant, deserving recognition and further study by benthic ecologists. Although rooted-erect and free-living lunulitiform bryozoans can be abundant in softbottom habitats, the presence of encrusting forms was, until recently, considered to be limited to patches of hard substrata. In 1985 and 1988, a new and seemingly unique habitat for encrusting bryozoans and other organisms on single grains of shell or sand was reported from the coastal waters of Florida, USA. Here we report a second discovery of an interstitial encrusting fauna from the continental shelf off the state of São Paulo, Brazil. In addition to the cupuladriid Discoporella umbellata, several species of bryozoans (9 cheilostomes, 3 ctenostomes, and 1 cyclostome) were found encrusting on or boring into sand grains from the 4 stations examined. Four species were found exclusively on sand to gravel size grains. The most abundant colonies, withB1300-1500 colonies m_2, belonged to a new species of Cleidochasma. New species of Trypostega and Reginella, each with up to 200-300 coloniesm_2, were also discovered. Thegrain-encrusting bryozoans were characterized by their small size, and by the fact that sexual reproduction was initiated very early in colony growth; brood chambers (for the development of embryos into larvae) occurred in colonies having only a few zooids. Colonies of boring ctenostome and cheilostome bryozoans were even more abundant than those of grain encrusting forms, being present in almost every piece of shell (B5000-5500 coloniesm_2). The fauna also (continua) ) included representatives of other groups of encrusting organisms, especially tubeworms (11,000-13,000 tubesm_2). Planned work on samples from additional stations on the Sa˜ o Paulo shelf will no doubt yield a larger number of species from various taxa and perhaps show some overlap in sand fauna species between the Brazilian and Floridian sites. In addition to the unique species of single grain encrusters, colonies of bryozoan species characteristic of larger subtidal hard substrata were also found on sand or gravel size grains, indicating that an interstitial refuge may be available to some epifaunal taxa and suggesting that this interstitial refuge, which remains almost completely unknown to benthic ecologists, may play a large role in determining distributions of those taxa.
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    • Acesso à fonteDOI
    Informações sobre o DOI: 10.1111/j.1744-7410.2005.1241-10.x (Fonte: oaDOI API)
    • Este periódico é de assinatura
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    • ABNT

      WINSTON, Judith E. e MIGOTTO, Alvaro Esteves. A new encrusting interstitial marine fauna from Brazil. Invertebrate Biology, v. 124, n. 10, p. 79-87, 2005Tradução . . Disponível em: https://doi.org/10.1111/j.1744-7410.2005.1241-10.x. Acesso em: 23 abr. 2024.

    • APA

      Winston, J. E., & Migotto, A. E. (2005). A new encrusting interstitial marine fauna from Brazil. Invertebrate Biology, 124( 10), 79-87. doi:10.1111/j.1744-7410.2005.1241-10.x

    • NLM

      Winston JE, Migotto AE. A new encrusting interstitial marine fauna from Brazil [Internet]. Invertebrate Biology. 2005 ; 124( 10): 79-87.[citado 2024 abr. 23 ] Available from: https://doi.org/10.1111/j.1744-7410.2005.1241-10.x

    • Vancouver

      Winston JE, Migotto AE. A new encrusting interstitial marine fauna from Brazil [Internet]. Invertebrate Biology. 2005 ; 124( 10): 79-87.[citado 2024 abr. 23 ] Available from: https://doi.org/10.1111/j.1744-7410.2005.1241-10.x

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