First record of the vermetid Petaloconchus varians (d’Orbigny, 1841) on floating marine debris at Ilha Grande, Rio de Janeiro, Brazil

Breves, André; Skinner, Luís Felipe

doi:10.5894/rgci457

Cited by 4 publications

(1 citation statement)

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“…The individuals of Petaloconchus varians that constructed the monospecific reefs on the rocky shores of Ilha Grande Bay are morphologically similar to descriptions and morphological observations of this species provided in previous records for Rio de Janeiro State (Orbigny 1841, Breves-Ramos et al 2010a, b, Breves andSkinner 2014), Atol das Rocas (Soares et al 2011), Venezuela (Weinberger et al 2010) and Florida, USA (Strong 2003).…”

Section: Discussionsupporting

confidence: 53%

Abundance of the reef-building Petaloconchus varians (Gastropoda: Vermetidae) on intertidal rocky shores at Ilha Grande Bay, southeastern Brazil

Breves¹,

Széchy²,

Lavrado³

et al. 2017

An. Acad. Bras. Ciênc.

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The reef-building vermetid Petaloconchus varians occurs in the western Atlantic Ocean, from the Caribbean Sea to the southern coast of Brazil. The present study evaluated the abundance of P. varians on intertidal rocky shores in Ilha Grande Bay (Rio de Janeiro State), and characterized their reefs, describing the species density, besides the weight and the belt width of the reefs. Petaloconchus varians reefs were recorded at 25 sites, with rocky shores exposed to different wave action (very sheltered, sheltered, semi-exposed and exposed) and slopes (10° to 46°). Clusters of individuals constructed large reefs along the middle intertidal zone, creating a wide belt (38 cm to 2 m). The density of P. varians and the weight of the reefs ranged from 620 to 2,559 ind.100 cm -2 and from 100 to 1,500 g.100 cm -2 , respectively. Considering that the species was last reported from the area in the mid-20 th century, the present study suggests that P. varians reefs are becoming dominant in the intertidal zone of rocky shores in Ilha Grande Bay. This is a contribution to knowledge of this ecosystem in Ilha Grande Bay, in view of local or global ecological changes.

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Section: Discussionsupporting

confidence: 53%