Zonação intertidal de uma comunidade malacológica na "Poça da Barra", uma lagoa localizada na plataforma costeira da Vila das Lages do Pico, Açores

Ávila, Sérgio P.

http://hdl.handle.net/10400.3/947

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Authors

Ávila, Sérgio P.

Abstract(s)

An ecological study of the malacological composition of the intertidal zone, at a rocky shore, was performed. Three transects with quadrats of 25x25 cm were surveyed and profiles were made for two transects. A total of 12.285 molluscs were collected within a very sheltered lagoon. Preliminary results indicate that the dominant species is Cingula trifasciata (J. Adams, 1800) and, in a much lesser degree, Ovatella vulcani (Morelet, 1860), Onchidella celtica (Forbes & Hanley, 1853) and Auriculinella bidentata (Montagu, 1808). Juveniles of Ovatella vulcani, a species endemic to the Azores, are quite common near the channel that connects the lagoon with the open sea. Rissoidae is the best represented family, with 7 species: Alvania cancellata (da Costa, 1778), Alvania mediolittoralis Gofas, 1989, Cingula trifasciata, Manzonia unifasciata Dautzenberg, 1889, Botryphallus ovummuscae (Gofas, 1990), Rissoa guernei Dautzenberg, 1889 and Selia subvaricosa Gofas, 1990. Four species of Ellobiidae were found - Ovatella vulcani, Auriculinella bidentata, Pselldomelampus exiguus (Lowe, 1832) and Pedipes pedipes (Gmelin, 1790). A total of 29 species were recorded. Ellobiidae make the transition between terrestrial and marine environment, followed by Onchidella celtica, a large species, abundant in the middle of the lagoon. The inferior half of the intertidal zone is dominated by Cingula trifasciata. Near low-tide level, Lasaea adansoni (Montagu, 1808) appears.

Keywords

Alvania mediolittoralis Alvania cancellata Auriculinella bidentata Onchidella celtica Cingula trifasciata Ovatella vulcani Malacological Composition Intertidal Zone Manzonia unifasciata Vila das Lajes do Pico (Açores)

URI

http://hdl.handle.net/10400.3/947

Citation

ÁVILA, SÉRGIO P., (1998). Zonação intertidal de uma comunidade malacológica na "Poça da Barra", uma lagoa localizada na plataforma costeira da Vila das Lages do Pico, Açores. "Açoreana. Revista de Estudos Açoreanos", 8(4): 457-485.