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Biota Neotropica

Print version ISSN 1678-6424On-line version ISSN 1676-0611

Biota Neotrop. vol.14 no.4 Campinas  2014  Epub Nov 28, 2014

http://dx.doi.org/10.1590/1676-06032014011514 

Inventory

Gastropoda (Mollusca) associated to Sargassum sp. beds in São Sebastião Channel - São Paulo, Brazil

Gastropoda (Mollusca) associados a bancos deSargassum sp. no Canal de São Sebastião - São Paulo, Brasil

Pedro Augusto dos Santos Longo1  2 

Marjorie Cattaneo Fernandes1 

Fosca Pedini Pereira Leite1 

Flávio Dias Passos1 

1Departamento de Biologia Animal, Universidade Estadual de Campinas, Instituto de Biologia, Rua Monteiro Lobato, 255,CEP 13083-862, Campinas, SP, Brazil

ABSTRACT

The phytal is characterized by the formation of seaweed beds and a great diversity of associated species, the malacofauna being one of its main components. Aiming to record the species of Gastropoda associated to the brown algae Sargassum sp. C. Agardh, 1820, this study was carried out in São Sebastião Channel, northern coast of São Paulo, and nearby areas. A total of 13945 individuals were identified, belonging to 35 families and 62 species. Cerithiidae, Phasianellidae and Columbellidae were the most abundant families, represented by 34, 33 and 17% of the total collected individuals, respectively. Bittiolum varium (Pfeiffer, 1840) (Cerithiidae) and Eulithidium affine (C. B. Adams, 1850) (Phasianellidae) are the dominant species, followed by the columbelids Mitrella dichroa (G. B. Sowerby I, 1844), Anachis fenneliRadwin, 1968 and Costoanachis sertulariarium (d'Orbigny, 1839). Among the least abundant species, some of them may be considered as of fortuitous occurrences, while others seem to be typical in those habitats, although rare. The presence of juvenile specimens was recurrent, this indicating that the algae can function as a nursery for most of these species. The expressive values found, for both abundance and number of species, illustrate the great ecological importance of the phytal habitats for the gastropod species.

Key words: Biodiversity; marine gastropods; phytal

RESUMO

O fital é caracterizado pela formação de bancos de algas marinhas e uma grande diversidade de espécies associadas, estando a malacofauna entre seus principais componentes. Com o objetivo de registrar as assembleias de gastrópodes associadas è alga parda Sargassum C. Agardh, 1820, este estudo foi realizado no Canal de São Sebastião, litoral norte do estado de São Paulo, e áreas próximas. Um total de 13945 indivíduos foram identificados, pertencentes a 35 famílias e 62 espécies. Em termos de abundância, Cerithiidae, Phasianellidae e Columbellidae foram as famílias mais representativas, com 34, 33 e 17% do total de indivíduos coletados, respectivamente. Bittiolum varium (Pfeiffer, 1840) (Cerithiidae) e Eulithidium affine (C. B. Adams, 1850) (Phasianellidae) foram as espécies dominantes, seguidas pelos columbelídeos Mitrella dichroa (G. B. Sowerby I, 1844), Anachis fenneliRadwin, 1968 e Costoanachis sertulariarium (d'Orbigny, 1839). Entre as espécies pouco abundantes, algumas podem ser consideradas como de ocorrência ocasional, enquanto outras parecem ser típicas deste ambiente, porém raras. A presença de formas juvenis mostrou-se muito recorrente para a maioria das espécies, o que parece indicar que a alga pode atuar como berçário. Os valores expressivos encontrados, tanto para a abundância de indivíduos como para o número de espécies, ilustram a grande importância ecológica apresentada por este ambiente para as espécies de gastrópodes.

Palavras-Chave: Biodiversidade; gastrópodes marinhos; fital

Introduction

Seaweed beds carrying an associated fauna form a singular community known as the phytal, a generally rich assemblage of organisms regulated by both biotic (e.g. predation, competition, recruitment and migration) and abiotic factors (e.g. hydrodynamism, nutrients availability, habitat structure, light incidence and temperature) (Chemello & Milazzo 2002, Jacobucci & Leite 2002, Leite et al. 2009). In these communities, algae provide several advantages for invertebrate and vertebrate animals inhabiting their fronds, including protection against desiccation, wave action and predators, better temperature and salinity conditions, as well as food resources (Jacobucci & Leite 2002, Jacobucci et al. 2006, Leite et al. 2009). Among macroalgae groups composing the phytal, those of Sargassum can be considered one of the most representative in some localities of the Brazilian coast (Széchy & Paula 2000), with the malacofauna standing out both in abundance and diversity (Montouchet 1979, Schézy & Paula 2000, Chemello & Milazzo 2002, Jacobucci & Leite 2002, Leite et al. 2009, Veras 2011).

Gastropods, in particular, are an important part of the phytal fauna. Studies highlighting and describing the diversity of phytal molluscan assemblages are scarce in Brazil, especially in the coast of São Paulo state, some of which are Montouchet (1979), Jacobucci et al. (2006) and Leite et al. (2009). Furthermore, illustrated inventories are practically absent in the literature, this kind of work being an important tool to the development of future studies of the phytal gastropod assemblages, as it can facilitate the species identification.

The aim of this study is to provide such an inventory of the gastropod fauna associated to Sargassum sp. beds from São Sebastião Channel and nearby areas, thereby increasing knowledge on the biodiversity of this environment, as well as illustrating its species.

Material and Methods

This study was carried out in the northern part of the coast of São Paulo State, southeastern Brazil (23°43'-23°52'S; 45°20'-45°27'W), where algae bed samples were obtained from thirteen sites in March, September and December of 2007, and in February of 2008. Two of these sites are placed in Caraguatatuba and Ubatuba municipalities (at Tabatinga and Ubatumirim beaches, respectively) and eleven are distributed in the São Sebastião Channel. In this channel, six sites were chosen from its insular part (São Sebatião Island, Ilhabela municipality) and five from the continental part (São Sebatião municipality) (Figure 1).

Figure 1 Collecting sites in the insular and continental part of the São Sebastião Channel, and in the Caraguatatuba and Ubatuba municipalities. The placement of this area is indicated by an arrow pointing the north coast of the State of São Paulo (SP), southeastern Brazil. 

At each site, a horizontal transect was established, where ten fronds were randomly collected, each of them with its holdfast being detached from the substratum. These fronds were enclosed in a bag of 0.2 mm mesh size and at the laboratory were washed in seawater in order to separate the associated animals from algae, and to sort the gastropods for to be fixed and preserved in a solution of 70% ethanol. The obtained gastropods were examined under the stereomicroscope, identified through their shell characteristics, counted from each collecting site and then separated in lots which were deposited in the Zoology Museum of the State University of Campinas “Prof. Adão José Cardoso”. For each species, well preserved specimens were chosen to be photographed by a camera coupled to a Zeiss “Discovery V8” stereomicroscope. All these lots are georeferenced and registered in the Center of Reference in Environmental Information (CRIA) database. About five morphotipes of shelless opisthobranch gastropods could be distinguished, but most of the total specimens were poorly preserved, hence, precluding an accurate identification; these were, therefore, excluded in this inventory.

Results

A total of 13945 individuals from 62 species belonging to 35 families was obtained (Table 1). These specimens compose 2437 deposited lots (Table 1). All the identified species are shown in Figures 2, 3, 4 and 5. Except for 32 specimens of the single Calliostomatidae (Calliostoma sp.), one of the single Marginellidae (Volvarina sp.), one of the Eulimidae Vitreolina sp., and 32 juveniles of Columbellidae and 14 of Fissurellidae, all the animals were identified up to the species level. Most families (31) are represented by one or two species (Table 1). Pyramidellidae, Columbellidae, Eulimidae and Cerithiopsidae are the only exceptions to this rule, each one with eight, six, four and three species, respectively.

Table 1 Species, number of individuals (N), series number, literature used for the identification and places where species occurred (✗). S.Sb. = São Sebastião; Ib. = Ilhabela (São Sebastião Island); Tb. = Tabatinga (Caraguatatuba) and Ubm. = Ubatumirim (Ubatuba) 

Family/Species n Series number Literature used Species occurrence
Cerithiidae S.Sb. Ib. Tb. Ubm.
Cerithium atratum (Born, 1778) 81 1652-1660 Marcus & Marcus 1964, Rios 2009
Bittiolum varium(Pfeiffer, 1840) 4642 2389-2870 Houbrick 1977, Houbrick 1993, Simone 2001
Phasianellidae
Eulithidium affine(C. B. Adams, 1850) 4630 752-1037; 1881-1887 Robertson 1958, Marcus & Marcus 1960; Pereira et al. 2010
Columbellidae
Anachis fenneliRadwin, 1968 626 1366-1420; Radwin 1968
1422-1478
Costoanachis sertulariarum(d'Orbigny, 1839) 600 2871-3051 Marcus & Marcus 1962
Costoanachis sparsa(Reeve, 1859) 124 1306-1365; Marcus & Marcus 1962
1421;
1479-1484
Anachis obesa(Adams, 1845) 121 2227-2269 Marcus & Marcus 1962
Mitrella dichroa(G. B. Sowerby I, 1844) 813 1142-1305 Marcus & Marcus 1962
Astyris lunata(Say, 1826) 1 1608 Marcus & Marcus 1962
Columbella mercatoria(Linnaeus, 1758) 15 1588-1607 Marcus & Marcus 1962, Radwin 1977
Columbellidae jovens 32 1812-1825
Caecidae
Caecum ryssotitumde Folin, 1867 323 1038-1100 Mello 1986, Bendel 1996, Gomes & Absalão 1996
Caecum brasilicumde Folin, 1874 294 1101-1141 Mello 1986, Bendel 1996, Gomes & Absalão 1996, Rios 2009
Rissoidae
Alvania auberiana(d’Orbigny, 1842) 302 1994-2070 Abbott 1974, Rios 2009
Fissurellidae
Fissurella rosea(Gmelin, 1791) 200 2270-2359 Righi 1965, Abbott 1974, Rios 2009
Fissurellidae jovens 14 1794-1770 Sasaki 1998, Reynoso-Granados et al. 2007
Pyramidellidae
Fargoa bushiana(Bartsch, 1909) 5 1863-1869 Abbott 1974, Pimenta et al. 2009
Folinella robertsoni(Van Regteren Altena, 1975) 37 1847-1862 Mello 1990, Pimenta et al. 2008, Rios 2009
Boonea jadisi(Olsson & McGinty, 1958) 16 1717-1727 Rios 1985, Pimenta et al. 2009
Chrysallida nioba(Dall & Bartsch, 1911) 33 1692-1716 Pimenta 2012
Turbonilla multicostata(C. B. Adams, 1850) 160 2147-2226 Rios 2009
Eulimastoma didyma(Verrill & Bush, 1900) 22 2071-2080 Pimenta et al. 2004
Turbonilla penistoniBush, 1899 10 1633-1643 Bush 1899, Absalão & Pimenta 1999
Trabecula krumpermani(De Jong &Coomans, 1988) 4 1687-1691 Pimenta et al. 2009, Rios 2009
Rissoellidae
Rissoella ornataSimone, 1995 194 1953-1993 Simone 1995
Litiopidae
Alaba incerta(d’Orbigny, 1841) 148 2081-2146 Houbrick 1987, Simone 2001, Rios 2009
Barleeidae
Amphithalamus glabrusSimone, 1996 123 1930-1952 Simone 1995
Scaliolidae
Finella dubia(d’Orbigny, 1840) 43 1752-1763 Abbott 1974, Simone 2001, Rios 2009
Cerithiopsidae
Retilaskeya bicolor(C. B. Adams, 1845) 2 1888-1889 Rios 2009
Seila adamsii(H. C. Lea, 1845) 2 1892-1893 Rólan & Fernandes 1990, Rios 2009
Cerithiopsis gemmulosa(C. B. Adams, 1850) 35 1826-1846 Rios 1985, Rolán & Espinosa 1995
Assimineidae
Assiminea succinea(Pfeiffer, 1840) 18 1905-1917 Marcus & Marcus 1965, Rios 2009
Buccinidae
Engina turbinella(Kiener, 1836) 34 1771-1799 Abbott 1974, Rios 2009
Triphoridae
Marshallora nigrocincta(C. B. Adams, 1839) 6 1800-1802 Rios 2009
Nototriphora decorata(C. B. Adams, 1850) 11 1803-1811 Rios 2009, Fernandes et al. 2013
Littorinidae
Echinolittorina lineolata(d'Orbigny, 1840) 16 1623-1632; Rios 2009
1899-1901
Muricidae
Stramonita brasiliensisClaremont& D. G. Reid, 2011 25 1738-1751 Rios 1985, Rios 2009, Claremont et al. 2011
Muricopsis necocheana(Pilsbry, 1900) 6 1902-1904 Absalão & Pimenta 2005, Rios 2009
Calliostomatidae
Calliostoma sp. Swainson, 1840 13 1678-1686 Quinn 1992, Dornellas 2012
Scissurellidae
Scissurella alexandreiMontouchet, 1972 10 1728-1731 Montouchet 1972
Tornidae
Circulus cf. liratus(A. E. Verrill, 1882) 2 1927-1928 Spencer & Campbell 1987
Parviturboides interruptus(C. B. Adams, 1850) 8 1644-1651 Abbott 1974, Rios 2009
Eulimidae
Melanella cf. eulimoides(C. B. Adams, 1850) 2 1734-1735 Rios 2009
Vitreolina arcuata(C. B. Adams, 1850) 1 1732 Rios 2009
Vitreolina sp. 1 1733 Warén 1983
Melanella eburnea(Mühlfeld, 1824) 1 1736-1737 Queiroz et al. 2013
Turbinidae
Lithopoma phoebium(Röding, 1798) 2 1919-1920 Abbott 1974, Williams 2007, Rios 2009
Tegula viridula(Gmelin, 1791) 3 1896-1898 Williams et al. 2008; Rios 2009
Nassariidae
Nassarius albus(Say, 1826) 2 1890-1891 Matthews 1968, Absalão & Pimenta 2005, Rios 2009
Mangeliidae
Tenaturris fulgens(E. A. Smith, 1888) 2 1923-1924 Rios 2009
Glyphoturris rugirima(Dall, 1889) 2 1894-1895 Absalão et al. 2005, Rios 2009
Epitoniidae
Epitonium cf. worsfoldiRobertson, 1994 1 1929 Robertson 1993
Retusidae
Pyrunculus caelatus(Bush, 1885) 1 1926 Absalão & Pimenta 2005, Rios 2009
Ellobiidae
Pedipes mirabilis(Mühlfeld, 1816) 1 1925 Abbott 1974, Rios 2009
Modulidae
Modulus modulus(Linnaeus, 1758) 1 1922 Houbrick 1980
Pseudomelatomidae
Crassispira cf. fuscescens(Reeve, 1843) 1 1921 Rios 2009, Fallon 2011
Rissoinidae
Schwartziella bryerea(Montagu, 1803) 23 1609-1622 Rios 2009
Planaxidae
Fossarus ambiguus(Linnaeus, 1758) 1 3350 Houbrick 1990
Bullidae
Bulla occidentalisA. Adams, 1850 82 2360-2388 Malaquias & Reid 2008
Haminoeidae
Haminoea antillarum(d’Orbigny, 1841) 16 1871-1879 Abbott 1974
Cylichnidae
Cylichna discusWatson, 1883 2 1880 Marcus 1970, Absalão & Pimenta 2005, Rios 2009
Marginellidae
Volvarina sp. 1 1918 Rios 2009

Figure 2 Photomicrographs of the gastropod species collected in Sargassum sp. beds from the São Sebastião Channel, Caraguatatuba and Ubatuba (continues in Figures 3 to 5). Cerithiidae: Cerithium atratum (A) and Bittiolum varium (B). Phasianellidae: Eulithidium affine (C). Columbellidae: Anachis fenneli (D), Costoanachis sertulariarum (E), Costoanachis sparsa (F), Anachis obesa (G), Mitrella dichroa (H), Astyris lunata (I), and Columbella mercatoria (J). Caecidae: Caecum ryssotitum (K) and Caecum brasilicum (L). Rissoidae: Alvania auberiana (M). Fissurellidae: Fissurella rosea (N). Scale bars: 500um for A and K-N; 1000um for B-J. 

Figure 3 Photomicrographs of the gastropod species collected in Sargassum sp. beds from the São Sebastião Channel, Caraguatatuba and Ubatuba. Pyramidellidae: Fargoa bushiana (A), Folinella robertsoni (B), Boonea jadisi (C), Chrysallida nioba (D), Turbonilla multicostata (E), Eulimastoma didyma (F), Trabecula krumpermani (G), Turbonilla penistoni (H). Rissoellidae: Rissoella ornata (I). Litiopidae: Alaba incerta (J). Barleeidae: Amphithalamus glabrus (K). Scaliolidae: Finella dubia (L). Cerithiopsidae: Retilaskeya bicolor (M), Seila adamsii (N) and Cerithiopsis gemmulosa (O). Assimineidae: Assiminea succinea (P). Buccinidae: Engina turbinella (Q). Scale bars: 500um for A, D, F, K and P; 250 um for B; 1000um for C, E, G-J, L-O and Q. 

Figure 4 Photomicrographs of the gastropod species collected in Sargassum sp. beds from the São Sebastião Channel, Caraguatatuba and Ubatuba. Triphoridae: Marshallora nigrocincta (A), Nototriphora decorata (B). Littorinidae: Echinolittorina lineolata (C). Muricidae: Stramonita brasiliensis (D) and Muricopsis necocheana (E). Calliostomatidae: Calliostoma sp. (F). Scissurellidae: Scissurella alexandrei (G). Tornidae: Circulus cf. liratus (H) and Parviturboides interruptus (I). Eulimidae: Melanella cf. eulimoides (J), Vitreolina arcuata (K), Vitreolina sp. (L), Melanella eburnea (M). Turbinidae: Lithopoma phoebium (N) and Tegula viridula (O). Scale bars: 1000um for A-F and K-O; 500um for G-J. 

Figure 5 Gastropod species collected in Sargassum sp. beds from the São Sebastião Channel, Caraguatatuba and Ubatuba. Nassariidae: Nassarius albus (A). Mangellidae: Tenaturris fulgens (B) and Glyphoturris rugirima (C). Epitoniidae: Epitonium cf. worsfoldi (D). Retusidae: Pyrunculus caelatus (E). Ellobiidae: Pedipes mirabilis (F). Modulidae: Modulus modulus (G). Pseudomelatomidae: Crassispira cf. fuscescens (H). Rissoinidae: Schwartziella bryerea (I). Planaxidae: Fossarus ambiguus (J). Bullidae: Bulla occidentalis (K). Haminoeidae: Haminoea antillarum (L). Cylichnidae: Cylichna discus (M). Marginellidae: Volvarina sp. (N). Scale bars: 1000um for A-K; 500um for L-N. 

In terms of abundance, the predominance of a few families is remarkable: specimens of Cerithiidae, Phasianellidae and Columbellidae are the most numerous, representing altogether 84% of the total number of individuals. This is mainly caused by the fact that Eulithidium affine (C. B. Adams, 1850) (the single Phasianellidae) and Bittiolum varium (Pfeiffer, 1840) (Cerithiidae) are the best represented species (4630 and 4642 specimens, respectively), followed by Mitrella dichroa (G. B. Sowerby I, 1844) (n=813), Anachis fenneliRadwin, 1968 (n=626) and Costoanachis sertulariarium (d'Orbigny, 1839) (n=600) (Columbellidae). Apart from these abundant species, 57 species are responsible for 19% of the total number of individuals (Figure 6). Some of them were well collected, as Caecum ryssotitum de Folin, 1867, Caecum brasilicum de Folin, 1874 and Alvania auberiana (d’Orbigny, 1842), with 323, 294 and 302 individuals, respectively. Noteworthy is also the occurrence of Costoanachis sparsa (Reeve, 1859), Anachis obesa (Adams, 1845), Fissurella rosea (Gmelin, 1791), Turbonilla multicostata (C. B. Adams, 1850), Rissoella ornataSimone, 1995, Alaba incerta (d’Orbigny, 1841) and Amphithalamus glabrus Simone, 1996, each one represented by 100 to 200 specimens. Regarding the more rare species, 26 presented less than 10 specimens; for some species, most animals found are juveniles, as for Cerithium atratum (Born, 1778), F. rosea, T. multicostata, Stramonita brasiliensis Claremont & D. G. Reid, 2011, Calliostoma sp. and Bulla occidentalis A. Adams, 1850.

Figure 6 The most representative species and families, in terms of relative abundance of collected individuals. 

Discussion

Expressive values for both number of species and individuals were found for the Gastropoda assemblages studied herein. Similar records had already been found for phytal assemblages of other algae species and from other localities (Montouchet 1979, Schézy & Paula 2000, Chemello & Milazzo 2002, Jacobucci & Leite 2002, Jacobucci et al. 2006, Almeida 2007, Leite et al. 2009, Veras 2011). Many families identified in this work, including the most abundant ones (Cerithiidae, Phasianellidae and Columbellidae) have recurrent records in general phytal studies already developed in Brazil (Montouchet 1979, Jacobucci et al. 2006, Almeida 2007, Leite et al. 2009, Veras 2011).

The two most abundant species, B. varium and E. affine, exhibit similar feeding habits: they graze algae surface and feed on the perifiton settled on the fronds (Marcus & Marcus 1960, Montfrans et al.1982). The following most abundant species, the columbelllids M. dichroa and A. fenneli, on the other hand, are both carnivorous species (Radwin 1977). The Pyramidellidae and the Eulimidae, with eight and four species, respectively, are known as parasites of other invertebrates (Warén 1983, Wise 1996). This diversity in the feeding habits is notorious throughout all the species, and indicates that the Sargassum sp. beds are a highly heterogeneous environment, which provides a great variety of food sources for its associated species. This should be expected, since Sargassum species are already known as having a high structural complexity (Széchy & Paula 2000).

Among the least abundant species (< 50 specimens), some of them are known to occur in phytal habitats, e.g. Columbella mercatoria (Linnaeus, 1758), Schwartziella bryerea (Montagu, 1803), Finella dubia (d’Orbigny, 1840), Seila adamsii (H. C. Lea, 1845), Assiminea succinea (Pfeiffer, 1840), Nototriphora decorata (C. B. Adams, 1850) and Glyphoturris rugirima (Dall, 1889) (Rios 2009). On the other hand, a few species found are typical from other habitats like rocky shores or soft bottoms, e.g. Echinolittorina lineolata (d'Orbigny, 1840), S. brasiliensis, Calliostoma sp., Melanella eburnea (Mühlfeld, 1824) and Tegula viridula (Gmelin, 1791). In this last case, the occurrence of most species in the Sargassum sp. beds can be considered as fortuitous, whilst in the former case, those species can be characterized as rare, even though they can be considered typical in this habitat. In both cases, and also for many of the more numerous species, it is notable the presence of juvenile forms. This may be an indicator that the seaweed beds are a favorable environment for the development of these gastropods, due to the many benefits provided by the algae, which can act as a nursery for many species.

The gastropod assemblages stand out, therefore, as an important component of the associated fauna of the Sargassum sp. beds in São Sebastião Channel, northern coast of São Paulo. However, studies describing the composition and dynamics of these phytal assemblages are still scarce, especially the ones developed in Brazil. A higher and more detailed knowledge of these assemblages are an important step for a better understanding and conservation of these environments.

Acknowledgements

We wish to thank FAPESP, for the financing support of the senior author (Proc. 2012/09374-8); G. B. Jacobucci, M. L. L. de Moraes and S. G. L. Siqueira for performing the collections, as well as the technicians from CEBIMar - USP for the help and support during the collecting process; P. V. F. Corrêa for the edition of the map; and A. D. Pimenta, J. H. Leal, L. Souza, M. Fernandes, R. Figueira and S. F. B. de Lima for the help during the identification process.

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Received: July 23, 2014; Revised: October 08, 2014; Accepted: October 09, 2014

Corresponding author: Pedro Augusto dos Santos Longo Pedro Augusto dos Santos Longo, Programa de Pós-Graduação em Ecologia, Universidade Estadual de Campinas (UNICAMP) CEP 13083-970, Campinas, SP, Brasil, e-mail: pedro.slongo@gmail.com

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