A associação entre Crepidula aculeata (Gastropoda, Calyptraeidae) a alga calcárea Amphiroa beauvoisii, na Baía de Santos, São Paulo, Brasil

A associação entre Crepidula aculeata (Gastropoda, Calyptraeidae) a alga calcárea Amphiroa beauvoisii, na Baía de Santos, São Paulo, Brasil¹

Setuko Masunari

Curso de Pós-Graduação em Zoologia, Universidade Federal do Paraná, Curitiba, PR

ABSTRACT

Association Crepidula aculeata - Amphiroa beauvoisii. Population study of Crepidula aculeata Gmelin, 1791) (Gastropoda Calyptraeidae) and analysis of protocooperative association between the mollusc and the alga were carried out in the phytal of calcareous alga Amphiroa beauvoisii Lamouroux, 1816 at Ilha das Palmas, Santos Bay (24º00'S - 46º19'W). Samples were collected at three sites of different degree of water movement in the intertidal zone and sublittoral fringe during 1975 and 1976. From 93,916 organisms belonging to 172 species, 5,331 were Crepidula, the most abundant among sessile species. Also, Crepidula constitutes a substratum to attachment of Amphiroa, accounting for 30% of total phytal area. There was a positive correlation between the growth of shell and epizoic alga. Higher level of the phytal belt was more suitable for attachment and/or growth of the epizoic alga, without influence from water movement or season of the year. This association depends on the external morphology of the shell, filter-feeding habit, high adhesive power and lacking of mechanisms avoiding attachment of epizoics of Crepidula. Exuberant growth of the epizoic tuft over Crepidula female shell would constitute camouflage and protection of offsprings against predators.

Texto completo disponível apenas em PDF.

Full text available only in PDF format.

AGRADECIMENTO

Agradeço à Profa. Dra. Liliana Forneris da Universidade de São Paulo pela leitura crítica do presente trabalho.

• ¹
  BARNARD, J. L. 1970. Benthic ecology of Bahia de San Quintin Baja California. Smithson. Contr. Zool., 44:1-60
• BARNES, H. 1955. The growth rate of Balanus balanoides (L.). Oikos, 6:109-113.
• BARNES, H. & TOPINKA, J. A. 1969. Effect of the nature of the substratum on the force required to detach a common littoral alga. Am. Zool., 9:753-758.
• BARNES, R. D. 1980. Invertebrate Zoology. Saunders, Philadelphia. 1089p.
• COE, W. R., 1953. Influence of association, isolation, and nutrition on the sexuality of snails of the genus Crepidula. J. exp. Zool., 122 (1):5-19.
• GLYNN, P. W. 1965. Community composition, structure and interrelationships in the marine intertidal Endocladia muricata-Balanus glandula association in Monterey Bay, California. Beaufortia, 12:1198.
• HENDLER, G. & FRANZ, D.R. 1l71. Population dynamics and life history of Crepidula convexa Say (Gastropoda: Prosobranchia) in Delaware Bay. Biol. Bull. mar. Biol. Lab. Woods Hole, 141:514-526.
• KREBS, C. J. 1978. Ecology. The experimental analysis of distribution and abundance. Harper & Row, New York, 678p.
• LE GALL, S. & STREIFF, W. 1975. Protandric hermaphroditism in prosobranch gastropods. In: Reinboth, R. (Ed.), Intersexuality in the animal Kingdom. Springer-Verlage, Berlin.
• MASUNARI, S. 1982. Organismos do fital Amphiroa beauvoisii, I. Autoecologia. Bolm Zool. USP, 7:57-148.
• ODUM, E.P. 1971. Fundamentals of ecology. Saunders, Philadelphia. 574p.

1

Trabalho realizado com auxílio do Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq/MCT) e da Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Datas de Publicação

• Publicação nesta coleção
  17 Ago 2009
• Data do Fascículo
  1988