Abundance and distribution of sessile invertebrates under intertidal boulders (São Paulo, Brazil)

Abstract

The encrusting communities under two boulder fields (Praia Grande and Ponta do Baleeiro) were monitored monthly during 1990 and 1991, in São Sebastião, on the northern coast of São Paulo State, Brazil. Two sizes of boulders were chosen: small (20-30 cm² underside area) and larger ones (160-220 cm²) located on the middle and lower levels of the intertidal. The community's components were mainly sessile animals either compound ones such as Bryozoa, Ascidiacea, Porifera and Cnidaria, in this order of abundance, or simple ones such as Polychaeta and Bivalvia, also in this order of abundance. All groups, except by serpulids (Polychaeta), had higher percent cover in the low intertidal region and under large boulders. Diversity was higher at Ponta do Baleeiro, and in the low intertidal region and on large boulders for both shores.

Diel and tidal variations of benthic assemblages in sediments associated with boulder fields

“…Some investigators have the intuitive idea that the micro-environment below a boulder is a refuge, whereas sediments next to it or the areas on the top of boulders are not (e.g. Rao & Sarma 1979, Rocha 1995. It may be, however, that the top of a boulder constitutes a refuge for taxa whose predators arrive in sediments below boulders during high tide (e.g.…”

Diversidade de Serpulidae (Annelida, Polychaeta) entre as regiões Sul e Nordeste do Brasil

“…7J-K (Sun et al, 2016). No Brasil, há registros desta espécie no litoral de São Paulo, em São Sebastião e Ubatuba, e no Rio de Janeiro (Zibrowius, 1970a;Rullier & Amoureux, 1979;Morgado, 1980;Souza, 1989;Rocha, 1993Rocha, , 1995. Descrição: Corpo de pequeno porte, 9-20 mm de comprimento, incluindo radíolos, 0,6-1,0 mm de largura, com até 10 radíolos por lobo branquial ( Fig.…”

First record of Phragmatopoma caudata Krøyer in Mörch, 1863 (Annelida, Sabellariidae) in the state of Piauí, northern Brazilian coast: westernmost record in Brazil

“…Brazil: Ceará-CE (Fausto-Filho and Furtado 1970, Kirtley 1994, Fournier et al 2010Nunes et al 2016), Rio Grande do Norte-RN (Fournier et al 2010), Paraíba-PB (Fournier et al 2010, Santos et al 2011, Pernambuco-PE (Nunes et al 2016), Bahia-BA (Santa-Isabel et al 2000), Espírito Santo-ES (Nunes et al 2016), Rio de Janeiro-RJ (Amaral 1987, Kirtley 1994, Lana and Bremec 1994, Moreno and Rocha 2006, Masi and Zalmon 2008, Masi et al 2009, Occhioni et al 2009, Fournier et al 2010, São Paulo-SP (Amaral 1987, Morgado and Amaral 1989, Lana and Bremec 1994, Rocha 1995, Micheletti-Flores and Negreiros-Fransozo 1999, Fransozo et al 2000, Occhioni et al 2009, Fournier et al 2010, Nunes et al 2016, Paraná-PR (Lana and Bremec 1994, Bosa and Masunari 2002a, 2002b, Occhioni et al 2009, Fournier et al 2010, Nunes et al 2016, Santa Catarina-SC (Kirtley 1994, Lana and Bremec 1994, Fournier et al 2010 and Rio Grande do Sul-RS (Amaral 1987, Lana andBremec 1994). ( ) New record.…”