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Diet of the Chola Guitarfish, Rhinobatos Percellens (Rhinobatidae), in the Paranaguá Estuarine Complex

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Diet of the Chola Guitarfish, Rhinobatos Percellens (Rhinobatidae), in the Paranaguá Estuarine Complex Anais da Academia Brasileira de Ciências (2015) 87(2): 721-731 (Annals of the Brazilian Academy of Sciences) Printed version ISSN 0001-3765 / Online version ISSN 1678-2690 http://dx.doi.org/10.1590/0001-3765201520140121 www.scielo.br/aabc Diet of the chola guitarfish, Rhinobatos percellens (Rhinobatidae), in the Paranaguá Estuarine complex WANESSA P.D. DO CARMO1, HUGO BORNATOWSKI2, ELTON C. OLIVEIRA1,3 and LUÍS L. FÁVARO1 1Universidade Federal do Paraná, Setor de Ciências Biológicas, Laboratório de Reprodução e Comunidade de Peixes, Departamento de Biologia Celular, Centro Politécnico, s/n, Jardim das Américas, Caixa Postal 19031, 81531-990 Curitiba, PR, Brasil 2Instituto de Pesca, Divisão de Pesca Marítima, Avenida Bartolomeu de Gusmão, 192, Ponta da Praia, 11030-906 Santos, SP, Brasil 3Universidade Tecnológica Federal do Paraná, Campus Dois Vizinhos, Estrada para Boa Esperança, Km 04, 85660-000 Dois Vizinhos, PR, Brasil Manuscript received on June 25, 2014; accepted for publication on September 5, 2014 ABSTRACT The chola guitarfish, Rhinobatos percellens, is one of the most-captured batoids on the Brazilian coast, and an important predator of benthic community. Stomachs from R. percellens were sampled in the Paranaguá estuarine complex (March/2006 to March/2007 and October/2008 to September/2009). The stomachs obtained were used for describing the diet of R. percellens, and verifying if there are seasonal and ontogenetic differences in their feeding into the estuarine area. The general analysis showed a specialized diet with a predominance of three species in food contents: Leptochela serratorbita, Caridea remains and Ogyrides alphaerostris. Ontogenetic and seasonal analysis did not reveal significant differences in the food consumption. These data reveal that R. percellens is a specialist predator of L. serratorbita, and this food component is consumed by all size classes. Key words: Elasmobranchii, Rhinobatidae, diet, especialist, Caridea, estuary. INTRODUCTION relationships in an ecosystem (Gerking 1994, Braga Predators and mesopredators can have a funda- et al. 2012, Bornatowski et al. 2014a). mental influence on the structure and function of Batoid fish regularly occupy intermediate trophic marine communities. Elasmobranchs can affect levels (trophic level <4.0) in their communities populations of invertebrates and fishes, representing (e.g. Navia et al. 2007, Vaudo and Heithaus 2011, an important role in the transfer of energy among Bornatowski et al. 2014b). Therefore, batoids can be marine trophic levels (Heithaus et al. 2008, Ferretti considered mesopredators that provide an important et al. 2010). The study of the diet and feeding habits link between top predators and lower trophic levels of fishes, through the analysis of stomach contents, in the marine ecosystem, and play an important has been standard practice for understanding basic role in marine ecosystem dynamics (Vaudo and biological aspects and the establishment of trophic Heithaus 2011). Rhinobatos percellens (Walbaum, 1792) is a Correspondence to: Wanessa P.D. do Carmo E-mail: [email protected] benthic species that can reach up to 100 cm total An Acad Bras Cienc (2015) 87 (2) 722 WANESSA P.D. DO CARMO, HUGO BORNATOWSKI, ELTON C. OLIVEIRA and LUÍS L. FÁVARO length. It is found in coastal waters up to 110 formed by Guaraqueçaba, Pinheiros, Laranjeiras, meters deep (McEachran and Carvalho 2002), Paranaguá and Antonina bays. It is connected to from the Gulf of Mexico to northern Argentina the ocean by narrow channels (relative to the total (Figueiredo 1977). It is one of the most-captured extent of the estuary, but sufficient to allow great rays on the Brazilian coast (Chaves and Robert influence from the adjacent ocean) (Fig. 1). The 2003, Costa and Chaves 2006, Bornatowski et inland areas, with truly estuarine characteristics, al. 2009), and an important component of the are less than 5 m deep, while the regions with coastal benthic ecosystem and fisheries around greater oceanic influence are up to 30 m deep the world, as others rhinobatids (Blanco-Parra et (Iapardes 2001). The bottom sediment in the funnel al. 2012). Studies show that the species has been zone is composed of fine sand and silt, while in overexploited by fisheries, particularly on the the lower zone, it is composed of well-sorted fine Brazilian continental shelf (De-Franco et al. 2010). to very fine sand (Soares et al. 1997). The tidal Meneses et al. (2005) report that R. percellens has regime is semi-diurnal with diurnal inequalities. no commercial value in some states of northeastern Mean neap and spring tidal heights are 1.3 and 1.7 m Brazil, while Costa and Chaves (2006) and respectively at the bay mouth, and 2.0 and 2.7 m Bornatowski et al. (2010) report commercialization at Antonina Bay (Marone and Jamiyanaa 1997). in the south. Based on preliminary investigations Mean freshwater inputs of 41 m3 s−1 (1997 winter) in the Paranaguá Estuarine Complex (a subtropical and 182 m3 s−1 (1998 summer) were quantified estuary in southern Brazil), R. percellens of several for the drainage area upstream of the Paranaguá size classes can be found throughout the year (E.C. Harbour (Mantovanelli 1999). Oliveira and L.F. Fávaro, unpublished data). The climate is Mesothermal Humid Subtropical There are few studies about feeding ecology (Cfa), with hot summers and a dry season that is not of R. percellens, and all of them have been carried well defined (Maack 1981). Lana et al. (2001) reported out on the continental shelf (e.g. Shibuya et al. a rainy period during the summer and a dry period 2005, Bornatowski et al. 2010, Grijalba-Bendeck during the winter. For the region, average annual et al. 2012). The lack of studies of R. percellens precipitation is 2500 mm and average humidity is in estuaries and the lack of data about feeding 85% (Lana et al. 2001). The salinity inside the estuary, biology of elasmobranchs in these environments on the sites where samples were obtained, varied from in Brazil are factors that triggered this work, 25 to 31 (Oliveira and Fávaro 2011), and outside the which showed that R. percellens use the estuary estuary it was 34 (SEMA 2006). for feeding purpose. The aims of the present study DATA COLLECTION were to: (i) describe the feeding of R. percellens in the Paranaguá Bay; (ii) assess ontogenetic and The animals were collected every month (March seasonal variations in diet; and iii) verify if this 2006 - March 2007 and October 2008 - September specie is a generalist or a specialist feeder. 2009) at eight different collection points distributed along the north-south axis of the Paranaguá MATERIALS AND METHODS Estuarine Complex. The specimens were caught by STUDY AREA trawl carried out for ten minutes at each sampling The Paranaguá Complex (between 25° 15´ S – 48° site. The trawl net had the following dimensions: 45´ W and 25° 35´ S – 48° 10´ W), covering 551.8 8 m mouth, 7 m cod end, 1.5 cm mesh size, knot- km2 (Noernberg et al. 2004), is the largest estuary of to-knot and otter boards weighing approximately the Brazilian Southern coast (Bigarella et al. 1978), 8 kg. All procedures were carried out according to An Acad Bras Cienc (2015) 87 (2) DIET OF Rhinobatos Percellens IN ESTUARINE WATERS 723 Figure 1 - Paranaguá Estuarine Complex. The dots (•) indicate the collection sites where specimens were not obtained and the asterisks (*) indicate the sites where Rhinobatos percellens specimens were obtained. the international practices for animal use and care DATA ANALYSIS under the control of an internal committee of the Frequency of occurrence (%), numerical (%) and Universidade Federal do Paraná, Brazil. weight (%) were obtained to compute the Index of After collecting, specimens were anesthetized Relative Importance (IRI). Frequency of occurrence with benzocaine, and had their spinal cord (%FO), numerical (%N) and weight (%W), were quickly sectioned, before being transported to represented by the respective formulas: %FO = the laboratory. Sex and morphometric data (total (ei / E) x 100, where %FO = percent frequency length - TL - in millimeters, total weight in grams) of occurrence of the sampled item, ei = quantity were determined. The digestive tract was removed, of stomachs containing item i, E = total number and the degree of fullness (DF) was determined of stomachs containing prey, %N = (ni / N) x 100, macroscopically, according to the classes: DF 1 where %N = percent numerical frequency of the = 0 (empty stomach), DF 2 = 1-25%, DF 3 = 26- sampled item, ni = number of items i ingested, 50%, DF 4 = 51-75%, DF 5 = 76-100%. Stomach N = total number of ingested items, %W = (wi / W) x contents were examined under a stereoscopic 100, where %W = percent weight frequency of the microscope. The identification of food items was sampled item, wi = weight of item i, W = total weight done to the lowest possible taxonomic level. of the sampled items (Hyslop 1980, Hacunda On this study, the pattern used for season was: 1981). For stomach contents analysis, only 56 Spring, from October to December; Summer, from stomachs (of 62) were used, and stomachs with January to March; Autumn, from April to June and material completely digested or an empty stomach Winter from July to September. were excluded from the analysis. An Acad Bras Cienc (2015) 87 (2) 724 WANESSA P.D. DO CARMO, HUGO BORNATOWSKI, ELTON C. OLIVEIRA and LUÍS L. FÁVARO To assess the importance of various prey taxa in RESULTS the R. percellens diets, the Index of Relative Impor- The 62 specimens of R. percellens caught, ranged tance (IRI, Pinkas et al. 1971, modified by Hacunda from 17.2 cm TL to 72.6 cm TL. Regarding the 1981) was calculated: IRI = (%N+%W)*%FO. degree of fullness (DF) for the 62 specimens The values of IRI were standardized in percentage analyzed in the study, the results are shown in values according to Cortés (1997).
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