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versión On-line ISSN 0718-560X
Lat. Am. J. Aquat. Res. vol.41 no.5 Valparaíso nov. 2013
Gastropod communities associated with Ulva spp. in the littoral zone in southeast Brazil
Comunidades de gasterópodos asociados con Ulva spp. en la zona litoral del sudeste de Brasil
1 Laboratório de Malacologia, Departamento de Ciências Biológicas, Centro de Ciências Humanas e Naturais, Universidade Federal do Espírito Santo - UFES Av. Marechal Campos, 1468, Maruípe, 29040-090, Vitória, ES, Brasil
2 Departamento de Ecologia e Oceanografia, Centro de Ciências Humanas e Naturais Av. Fernando Ferrari, 514, Goiabeiras, Vitória, ES, Brazil
Corresponding author: Gabriela C. Zamprogno: email@example.com
ABSTRACT. Phytal communities are characterized by spatial and temporal variation and are influenced by fluctuating biological and physical parameters. This study aimed to describe and compare the gastropods associated with Ulva spp., at three sites of the Espirito Santo coast with ferruginous laterite substrate and different modes of wave exposure. Camburi is characterized by the presence of iron ore particles. Samples were collected bimonthly. At each site, five sampling quadrats were launched at random in the intertidal region. Individuals of Ulva spp. were collected (2964 individuals) and 53 taxa were found. In Camburi the dominant species was Amphitalamus vallei (Barleeidae), while in Capuba and Manguinhos Eulithidium affine (Phasianellidae) predominated. The analyses indicated that Camburi is distinct from the other sites. The lesser wave impacts and the more complex structure of the algae in Camburi, due to the presence of iron ore, may explain this variation.
Keywords: Mollusca, phytal, ferruginous laterite, intertidal, southeast Brazil.
RESUMEN. Las comunidades phytales están influenciadas espacial y temporalmente por parámetros físicos y biológicos cambiantes. Este estudio describe y compara los gasterópodos asociados con Ulva spp. entre sitios en la costa de Espirito Santo, con sustrato laterítico ferruginoso y con diferentes modos de exposición al oleaje. Camburi está caracterizado por la presencia de partículas de mineral de hierro. Las muestras fueron recolectadas bimensualmente. En cada sitio se realizaron cinco cuadrantes de muestreo al azar en la region intermareal. Se encontraron 2.964 individuos y 53 taxa. En Camburi, la especie dominante fue Amphitalamus valley, y en Capuba y Manguinhos fue Eulithidium affine. El análisis realizado indicó que Camburi es distinto de los otros sitios. El menor impacto de las olas y la estructura más compleja de las algas en Camburi, debido a la presencia de mineral de hierro, puede explicar esta diferencia.
Palabras clave: Mollusca, phytal, laterita ferruginosa, intermareal, sudeste de Brasil.
The term phytal describes a coastal marine environment dominated by macrophytes and the organisms associated with them (Masunari, 1987). Animals are attracted by the nutritional value of algae (Norderhaug et al., 2007), and algae also provide shelters that protect the animals from physical stressors (such as desiccation and the impact of waves) and against predators (Viejo, 1999). Thus, marine macroalgae provide a microhabitat that is favorable for an abundant and diverse fauna (Pascal et al., 2009).
Substrates made of living organisms such as algae are characteristically dynamic and vary both temporally and spatially (Barreto, 1999). Variations in phytal community structure can be caused by biological parameters (such as predation, competition and recruitment) and physical parameters (such as light intensity, nutrient availability, hydrodynamics and structure of the habitat) (Chemello & Millazo, 2002). The relative importance of these factors is difficult to ascertain due to their high number and the interactions between them (Little & Kitching, 1996). It is well known that the fauna in phytal communities can be influenced by several parameters, including wave action (Hovel et al., 2002), architecture of algae (Chemello & Millazo, 2002; Kelaher, 2003), chemical defense by algae (Duffy & Hay, 1994) and sediment (Kelaher & Castilla, 2005).
The phytal community is composed predominantly of crustaceans, polychaetes and molluscs (Santos & Correia, 2001; Tanaka & Leite, 2003; Ramos et al., 2010). Molluscs are widely distributed in marine assemblages and may be extremely abundant in subtidal and intertidal habitats. They are common, highly visible and ecologically and commercially important on a global scale both as food and as a nonfood resource (Rittschof & Mcclellan-Green, 2005). The sedentary or sessile habit makes molluscs a prime candidate for use in studies of bioaccumulation and/or biomagnification of pollutants (Rittschof & Mcclellan-Green, 2005). Thus, molluscs, mainly gastropods, provide an ideal invertebrate model system for aquatic (and especially marine) environmental monitoring and toxicology (Rittschof & Mcclellan-Green, 2005).
Gastropods comprise one of the most abundant taxonomic groups (Montouchet, 1979; Tararam & Wakabara, 1981; Viejo, 1999; Balducci et al., 2001; Christie et al., 2003; Leite & Turra, 2003). Gastropod taxonomy has been well studied, and most studies have been devoted to quantifying their patterns of distribution with a very detailed level of taxonomic resolution (Terlizzi et al., 2005). There is much interest in the spatial and temporal patterns of distribution and activity of intertidal gastropods due to strong direct and indirect effects of grazing (Forrest et al., 2001).
Descriptive studies of phytal communities have been conducted by several authors in Brazil, such as Montouchet (1979), Albuquerque & Guerón (1989), Tanaka & Leite (2003), Santos & Correia (2001), Leite & Turra (2003) and Rocha et al. (2006). However few studies have been done in Espírito Santo. Sá & Nalesso (2000) described and analyzed the fauna associated with four different types of phytal communities, and Ramos et al. (2010) characterized the macrofauna associated with articulated calcareous algae occurring over a hydrodynamic gradient.
Throughout the 1970's and 1990's in the metropolitan region of Vitoria, Espírito Santo State, Brazil, an iron-ore processing complex had discharged the water used during the pelleting process onto Camburi beach, which is located in the inner part of Espírito Santo Bay (Nassar & Yoneshigue-Valentin, 2006). As a result, part of the sediment is covered by a layer of iron ore, frequently suspended and deposited over the benthic organisms by wave action, storms and tidal movements (Nassar & Yoneshigue-Valentin, 2006).
Establishment of biological habitat is an important step toward maintaining biodiversity. There are strong functional links between the components of a phytal community, and the importance of these links can be assessed by examining the community, at an appropriate scale, considering the influence of environmental factors such as the presence of iron ore and wave exposure.
The objectives of the present study are to investigate the spatial and temporal patterns of gastropod communities associated with macroalgae of the genus Ulva and to assess the environmental factors affecting the structure of communities in these areas, such as the presence of iron ore and wave exposure.
MATERIAL AND METHODS
Samples were collected from the northern littoral zone of Espírito Santo State, which is characterized by quaternary coastal deposits delimited by the Barreiras Formations (Martin et al., 1996), presenting consolidated formations of ferruginous laterite as substrate. The coastline of Espírito Santo is approximately 400 km long and part of the coast has been impacted by domestic sewage discharge, industrial and port developments, including Tubarão Port, Vitória Port and others. Some marinas along the coast are also potential sources of pollution.
The most frequent and intense winds are those from the northeast and southeast, with the former prevailing during the greater part of the year and the latter being associated with the cold fronts that occur regularly in the State's coastal zone (Albino et al., 2001).
Sampling was conducted on ferruginous laterite in the following sites: Camburi beach, located in the Espírito Santo bay and characterized by the presence of iron ore particles (Nassar et al., 2003; Nassar & Yoneshigue-Valentin, 2006); Manguinhos beach, an intensely urbanized beach possibly impacted by domestic sewage, located 12 km north of Camburi beach; and Capuba beach in an uninhabited region, protected by a strip of sandbank and located 23 km north of Camburi beach (Fig. 1).
Figure 1. Map of the study area showing the locations of the three shores sampled in the littoral zone on the Espirito Santo coast, Brazil.
The average water surface temperature was 24° ± 1°C and salinity was 37 ± 2 in Camburi, 25° ± 1°C and 38 ± 2 in Manguinhos and 25° ± 2°C and 38 ± 3 in Capuba (data obtained using an American Optical refracto-meter and a Lutron oxygen meter).
Those sites located in bays, which provide a barrier against winds and currents, were considered to be sheltered sites, whereas sites that directly receive prevailing winds and incident waves were considered to be exposed, as suggested by Széchy & Paula (2000). Based on these criteria, Manguinhos and Capuba were consideredad as exposed and Camburi as sheltered, since it is localized in a bay (Fig. 1).
Samples were collected during diurnal spring tides in February, April, June, August, October, and December of 2003.
At each sampling site, a horizontal stretch of 10 m was selected in the mid-intertidal zone, and 5 sampling quadrats (25x25 cm) were launched at random within this stretch. All individuals of Ulva spp. were collected from within each quadrat. Ulva spp. was present during all of the sampling periods. The samples were chilled at approximately 4°C for at least two hours and then washed in running water in a 0.5 mm mesh sieve. All gastropods retained in this sieve were preserved in 70% alcohol and identified. The biovolume of macroalgae was measured by the method of displacement in a graduated cylinder (Montouchet, 1979).
The identification of Ulva at the genus level only was justified by the fact that the species U. rigida, U. fasciata and U. lactuca, all of which are found in Espirito Santo, can be morphologically very similar, making field identification of these species difficult.
Community parameters such as number of species, number of individuals, density (100 mL of Ulva spp.), Shannon-Weaver's diversity index (log10 base) and Pielou's evenness index were calculated for each site in each sampling period. The bifactorial analysis of variance (two-way ANOVA) and multiple comparisons of means (Tukey-HSD) a posteriori (Zar, 1996) were used to evaluate the differences in these community parameters between sampling sites and periods.
Cluster analysis of the average density of species at each site and period was performed using the Bray-Curtis method. The analysis of similarity (ANOSIM; two factors) permutation test was used to assess differences among sites and periods. The percentage of similarity procedure (SIMPER) was used to rank the contribution of each species to similarity or dissimilarity between the sites. A cumulative contribution of 80% was applied as in Boaventura et al. (2002). The matrix of similarity for these tests included the mean density of species present in at least two samples, and data were transformed by the fourth root. For all tests, a was set at 0.05.
A total of 53 taxa and 2964 specimens of gastropods were recorded in association with Ulva spp., of which 79% were collected in Camburi, 16% in Manguinhos and 5% in Capuba (Fig. 2).
Figure 2. Number of individuals and number of species of gastropods associated with Ulva spp. at three sites of the Espirito Santo coast for all periods sampled (February-December 2003).
Table 1 shows the average density (individuals per 100 mL of Ulva spp.) and taxonomic list of species found at each site. Some young individuals could not be identified to species, and of these, 15 taxa were identified to genus and one to family.
Among all samples, six species had relative abundances greater than 1% of all individuals. Amphitalamus vallei was the most abundant species, comprising 66% of all individuals sampled, followed by Eulithidium affine (18.2%), Fissurella rosea (5.2%), Crepidula aculeata (1.4%), C. mercatoria (1.1%) and Fissurella sp. (1.1%).
The species that had relative abundance values over 5% at each site are shown in Figure 3. The numerically dominant species were A. vallei in Camburi (relative abundance of 84%) and E. affine in Manguinhos and Capuba (relative abundance of 76% and 59% respectively).
Figure 3. Relative abundances of the most common gastropod species associated with phytal Ulva spp. in each sampling area on the coast of Espirito Santo (February-December 2003).
The average values for number of species, number of individuals and density were highest in Camburi, the highest average diversity index was recorded in Manguinhos, and the highest evenness index was recorded in Capuba (Fig. 4). Significant differences across sites were found only in the number of species (P = 0.03) and the number of individuals (P = 0.04), and these resulted from the higher values recorded in Camburi as compared to Capuba.
Temporal analyses indicated no significant differences within sites across time (P > 0.05).
The cluster analysis indicated that more than 55% of the observed similarity resulted from a distinction between the samples collected in Camburi (excluding those collected at this site in April) and the samples collected at the other sites (Fig. 5). Samples from Camburi exhibited a predominance of A. vallei. Samples from the other sites were characterized by a greater abundance of E. affine. The analysis of similarity (ANOSIM) revealed significant differences between Camburi and the other sites (R = 0.40, P = 0.002) but did not indicate significant differences between periods (R = 0.073, P = 0.33).
The percentage of similarity procedure (SIMPER) revealed which species contributed most to similarity within groups in relation to the sites of sampling (Table 2). Amphitalamus vallei contributed most to the similarity among the samples from Camburi and the dissimilarity between these samples and those from the other sites. Eulithidium affine contributed most to the similarity between the samples from Manguinhos and Capuba.
Spatial variation was found across the sampling sites, but temporal variation was not found between the study periods. Differences in the composition of species and the number of individuals were observed in Camburi.
In the present study, a total of 53 gastropod taxa associated with Ulva spp. were recorded, taking into account that some individuals could not be identified to species. For many groups of benthic organisms, it has been demonstrated that environmental effects can be detected even when analyses are based on taxonomic higher levels than species (Ferraro & Cole, 1995; Sanchez-Moyano et al., 2006).
Spatial variation in epifaunal assemblages among and within habitats may be shaped by temporal variation at different scales ranging from weeks to months (Cacabelos et al., 2010). Epifauna frequently present strong temporal fluctuations due to a range of physical and biological factors (Leite & Turra, 2003; Rueda & Salas, 2008). In the present study, variations in species composition were found, but these differences were not statistically significant.
The accumulation of particulate iron ore on the fronds influences photosynthesis and consequently growth of seaweeds (Nassar et al., 2002; Nassar & Yoneshigue-Valentin, 2006). This phenomenon likely contributed to the occurrence of small Ulva specimens in Camburi. At this site, the algae are distributed in dense layers forming mats of short fronds that allow sediment to accumulate among the fronds, and consequently increase in complexity. At the other study sites, in contrast, the fronds are isolated and greater in length. Complex surfaces create a variety of niches that serve as refuges for animals of corresponding size (Kostylev et al., 2005). Thus, the communities of gastropods that inhabit more complex algae exhibit greater abundance and species richness (Chemello & Millazo, 2002).
Eulithidium affine has previously been found to be the dominant species of gastropod in phytal communities along the Brazilian coast (Montouchet, 1979; Dutra, 1988; Sa & Nalesso, 2000; Tanaka & Leite, 2003). The present results for Manguinhos and Capuba corroborate the above finding, confirming that E. affine is a representative gastropod species in phytal communities in this region.
However, in Camburi, Amphitalamus vallei was found to be the dominant species. Possibly the small size of Ulva spp. at this site enabled the occurrence of A. vallei, as individuals of this gastropod species are relatively small (approximately 1.14x0.78 mm, according to Rios, 1994). Eulithidium affine individuals are relatively large (approximately 7x5 mm, according to Rios, 1994) and require as substrate seaweed with larger fronds that provide more surface for adhesion (Dutra, 1988). Indeed, in order to assess the relationship between habitat complexity and its associated fauna with that habitat, it is necessary to consider body size (Kelaher, 2003).
The habitats provided by different types of macroalgae are affected differently by wave action (Tuya et al., 2008). Large algae with wider and more flattened fronds have a greater surface area exposed to water flow, and the animals that live on them may be more strongly affected by water motion than small algae and their fauna (Tuya et al., 2008). Thus, the phytal communities at Manguinhos and Capuba, where the algae have wider fronds, are possibly more strongly affected by wave action when compared with the algae and its associated fauna at Camburi. Moreover, the Camburi site suffers less wave action because it is in a sheltered area.
Anchana et al. (2003) observed a relationship between the accumulated sediment by algal turf and wave action, with greater accumulation of sediment in sheltered sites. The higher concentrations of sediment, accumulated between the fronds of algae, at Camburi may be related to lower wave impacts and may also have contributed to the greater number of gastropod species and individuals, especially individuals of A. vallei, at this site. According to Olabarria & Chapman (2001), Amphitalamus incidata experiences greater rates of survival and growth in habitats enriched with sediment because it can feed on diatoms and detritus in the sediment. Sediment accumulated by tufts of algae has a strong and consistent relationship with macrofauna (Kelaher et al., 2001), providing habitat for many species of gastropods (Olabarria & Chapman, 2001). According to Schmidt & Scheibling (2007), increased sedimentation in stands of Codium might favor colonization by sediment-dwelling invertebrates such as small molluscs, crustaceans and polychaetes.
Despite the large quantity of iron ore at Camburi, this site had the highest number of gastropod species and individuals. Ramos et al. (2010) also found higher values of abundance, richness and diversity in this same area, in addition to a high level of organic matter present in the sediment retained below the algal mat. According to Nassar & Yoneshigue-Valentin (2006), even with the fronds covered with iron ore at Camburi beach, the algae survive, with variable abundances across species. Thus, it can be concluded that the algae and their associated communities have adapted to the presence of this mineral.
The lesser wave impacts and the more complex structure of the algae in Camburi may contribute to explain the variation in gastropod fauna among the sites in this study. However, other factors not considered in this study, such as reproduction, recruitment and competition, might also have influenced the gastropod species distributions here observed. Both spatial and temporal patterns in communities are generally affected by physical and biological processes influencing recruitment, growth, reproduction and mortality of organisms (Benedetti-Cecchi et al., 2000).
Conservation of species is often based on conservation of their habitats or microhabitats. It is therefore important to have a mechanistic understanding of how associations between species and habitats are maintained (Olabarria et al., 2002). Coherent predicttions about potential changes o populations in response to disturbances require understanding of interactive variances (Olabarria & Chapman, 2001).
Possible causes of differences in the composition of species observed in the community of gastropods of Camburi, in comparison with other areas, are lesser wave impacts in Camburi, which is located in a bay, and the presence of iron ore in this area. Therefore, the present study expands the knowledge of the distribution of gastropods in intertidal habitats and increases the understanding of both the ecological patterns and the processes that influence phytal communities and the changes in such assemblages that may occur in response to human disturbances.
We would like to thank Dr. Júlio César Monteiro for the helpful identification of gastropods, Dr. Jones Bernardes Graceli and M.Sc. Sérgio Mendonça de Almeida for their suggestions and contributions to this manuscript, the members of the Malacology Laboratory (UFES) for their assistance during various stages of this study and Dr. André Luiz Nascentes Coelho from Laboratory of Cartography and Geographic Geotechnology, Federal University of Espirito Santo, for helping in the map elaboration.
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Received: 5 April 2012; Accepted: 11 October 2013