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Invertebrate Species List of Coastal Lagoons in the Balearic Islands Paloma Lucena-Moya*, Rut Abraín, Isabel Pardo, Begoña Hermida and Mar Domínguez

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Invertebrate Species List of Coastal Lagoons in the Balearic Islands Paloma Lucena-Moya*, Rut Abraín, Isabel Pardo, Begoña Hermida and Mar Domínguez Transitional Waters Bulletin TWB, Transit. Waters Bull. 4 (2010), n. 1, 1-11 ISSN 1825-229X, DOI 10.1285/i1825229Xv4n1p1 http://siba-ese.unisalento.it Invertebrate species list of coastal lagoons in the Balearic Islands Paloma Lucena-Moya*, Rut Abraín, Isabel Pardo, Begoña Hermida and Mar Domínguez. Department of Ecology and Animal Biology. University of Vigo, 36310-Vigo, Spain. *Corresponding author: Phone + 34 - 986 812 585; Fax +34 - 986 812 556; DATA ARTICLE E-mail [email protected] Abstract 1 - Coastal lagoons are particular ecosystems, since they are ecotones between terrestrial, freshwater and marine ecosystems, being characterized by a high temporal variability. Because of these characteristics, coastal lagoons have very peculiar abiotic and biotic conditions that require investigation if we are to understand their complex ecological functions. In this study, a list of invertebrate species from coastal lagoons in the Balearic archipelago is provided in order to enhance the knowledge of their aquatic fauna. This study reports on the existence of 123 species, from 135 genera and 24 families. The most common taxa were Chironomus spp. (Meigen, 1803) and Halocladius spp. (Hirvenoja, 1973) (Diptera, Chironomidae), Hydrobia ventrosa (Montgau, 1803) (Gastropoda, Hydrobiidae), Cyprideis torosa (Jones, 1850) (Ostracoda, Cytherideidae), Lekanesphaera hookeri (Leach, 1814) (Isopoda, Sphaeromatidae) and Naididae (Oligochaeta). Keywords: coastal lagoons, Balearic Islands, invertebrates, taxonomic list Introduction of the management efforts are focused on the The study of biological diversity is necessary conservation of a small number of species, for the conservation and sustainable primarily water-birds (Boix et al., 2008). In management of natural resources, as was the case of Balearic Islands, coastal lagoons declared by the Convention on Biological are the most important reservoirs of water, Diversity in Rio de Janeiro (1992). Knowledge after ground water. Thus, basic studies that of taxonomic diversity is a fundamental document biota in these ecosystems are of requisite to conserve any ecosystem. This great impotance. is especially true for the conservation of Coastal lagoons are ecotones between vulnerable ecosystems, such as coastal freshwater, marine and terrestrial ecosystems, lagoons. In particular, the composition of and are highly dynamic environmentally aquatic invertebrate communities in coastal (i.e. chemistry of the system) and biotically lagoons is relatively poorly known, and most (i.e., biological community) (Zaldívar et © 2010 University of Salento - SIBA http://siba-ese.unisalento.it TWB 4 (2010), n. 1 P. Lucena-Moya, R. Abraín, I. Pardo, B.Hermida, M. Domínguez al., 2008; Joyce et al., 2005). Coastal lagoon Material and Methods communities are generally considered to be Study Area comprised of opportunistic and specialist The Balearic Islands are located in the species derived from freshwater, marine and Eastern Mediterranean Sea, characterized by brackish sources (Barnes, 1988). In the case dry summers and mild winters, with the most of the Balearic Islands, taxonomic studies important rainfall occurring during fall and of aquatic invertebrates have been focused spring (Britton & Crivelli, 1993). We have on specific taxonomic groups and there are selected a network of sampling sites covering few comprehensive and extensive studies a wide range of abiotic conditions of the dealing with the whole community. The permanent coastal lagoons, including the majority of taxonomic lists were produced by four main islands of the Balearic archipelago: natural parks managers, works derived from Majorca, Minorca, Ibiza and Formentera. PhDs or official reports (e.g., Pretus, 1991; Majorca is the largest island (3620.42 km2), Riddiford, 1998 and references therein, Boix followed by Minorca (694.40 km2), Ibiza et al., 2009). In the present study, we aim (571.04 km2) and Formentera (82.49 km2). to improve the knowledge of the invertebrate A total of 34 natural coastal lagoons were species from coastal lagoons in the Balearic sampled between February and March 2008. Islands. With this objective, a list of Moreover, large and heterogeneous lagoons invertebrate species found in 34 permanent were divided into different sampling sites (up coastal lagoons is provided. This is the to six) (e.g., Albufera de Mallorca: 6 sampling first research to document the invertebrate sites; Albufera des Grau: 3 sampling sites) community from such a high number of in order to collect the maximum number natural permanent coastal lagoons in the of species. A list of the coastal lagoons is four main islands of the Balearic archipelago provided in Table 1 and their locations in (Majorca, Minorca, Ibiza and Formentera). Figure 1. Figure 1. Map of the Balearic Islands where the location of the studied coastal lagoons is shown (black points). © 2010 University of Salento - SIBA http://siba-ese.unisalento.it 2 TWB 4 (2010), n. 1 Invertebrate species list of coastal lagoons in the Balearic Islands Table 1 - List of coastal lagoons studied with the corresponding number codes. The sample code number used, the name of the coastal lagoon, the island, the samplers (PLM: Paloma Lucena-Moya; BHA: Begoña Hermida Andrade), the date and the UTM coordinates (zone 30) are shown. Prat i Salines de Mongofre (Addaia) is the name given for three different but very close coastal lagoons, so numbers 35, 36, 37 have the same name but relate to different sampling sites. Tank 1= heater, tank 2= crystallizer and tank 3= evaporator were differentiated in the case of the saltworks. © 2010 University of Salento - SIBA http://siba-ese.unisalento.it 3 TWB 4 (2010), n. 1 P. Lucena-Moya, R. Abraín, I. Pardo, B.Hermida, M. Domínguez Biological sampling and identification is shown in Table 1. Invertebrate samples were collected using The study records the presence of 123 species a sweep net (0.25 x 0.25 m frame net, 250 corresponding to 135 genera and 24 families. µm sieve), and following a protocol based on The commonest taxa were Chironomus the multi-habitat survey (Briers and Biggs, spp. (Diptera, Chironomidae) present in 24 2005; Barbour et al., 1999). We took 20 localities (55% of total), Halocladius spp. “sweeps” of 0.5 m, so the total area sampled (Diptera, Chironomidae) (22 localities, was 2.5 m2 (0.25*0.5*20). The sampling 50%), Hydrobia ventrosa (Gastropoda, was carried out in a littoral band (ca. 50 x Hydrobiidae) (19 localities, 43%), Cyprideis 3 m) of each coastal lagoon; samples were torosa (Ostracoda, Cytherideidae) (17 preserved in 70% ethanol, and once in the localities, 39%), Lekanesphaera hookeri laboratory they were sorted using sieves of (Isopoda, Sphaeromatidae) (15 localities, different pore size (5 mm, 1 mm and 0.1 34%) and Naididae (Oligochaeta) (14 mm). All invertebrates were identified to localities, 32%). genus or species except for some taxa of All taxa are characteristic of brackish Diptera, Oligochaeta, Polychaeta, Acari and waters. These results are in agreement Lepidoptera that were identified to family with the higher percentage of coastal level, and Nematoda that remained as class. lagoons of intermediate salinity (i.e., Moreover, some individuals were identified mesohaline: 6-30‰) in the Balearic Islands, to family level because their small size did since 42.62% of the sampling sites are not allow a higher taxonomic resolution (e.g., mesohaline, 32.79% are euhaline (>30‰) some individuals of Odonata or Heteroptera and 24.59% are oligohaline (<5‰) (Lucena- orders). An Olympus U-TV1X 40X compound Moya et al., 2009). The coastal lagoons and Nikon SMZ645 5X dissecting microscope with higher species richness were those were used for the identification (see Lucena- with higher numbers of microhabitats such Moya et al., 2009 for further details). as the Albufera de Mallorca (73 taxa), Prat i Salines de Mongofre (33 taxa), Albufera Results and discussion des Grau (27 taxa), Albufereta de Pollença The invertebrates found in the coastal lagoons (22 taxa). Our results are in agreement with of the Balearic Islands are listed below. The positive relationships reported between list is ordered by phylogenetic hierarchical species richness and the number of available taxonomic order following Fauna Ibérica habitats observed for a variety of other taxa (CSIC, 2004-2009). Species nomenclature and habitats (e.g., Stewart et al., 2000). was based on the following data bases: High richness also corresponded to coastal Integrated Taxonomic Information System lagoons with low salinity content, such as (ITIS) (National Museum of Natural History Gola de Cala en Porter (31 taxa), Albufera Washington, D.C., 2009), the species 2000 & de Mercadal - Son Saura (Nord) (29 taxa), ITIS Catalogue of Life (Bisby et al., 2009), Gola i maresme de Binimel·là (29 taxa), Prat ZipcodeZoo (The Bay Science Foundation de Son Bou (22 taxa), Prat de Bellavista - 2004-2008) and The World Register of Marine Son Saura (Sud) (21 taxa). Species (WORMS) (Appeltans et al., 2009). The inverse relationship between salinity In the taxonomic list, numbers in brackets and number of taxa has also been broadly correspond to the coastal lagoon where the reported (Williams et al., 1990; Williams, taxa were found. The correspondence between 1998). Finally, high species richness was each number code and coastal lagoon identity also observed in euhaline coastal lagoons © 2010 University of Salento - SIBA http://siba-ese.unisalento.it 4 TWB 4 (2010), n. 1 Invertebrate species list of coastal lagoons in the Balearic
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