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Diet of Aplastodiscus Perviridis Lutz 1950 (Anura, Hylidae) in Subtemperate Forests of Southern Brazil

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Diet of Aplastodiscus Perviridis Lutz 1950 (Anura, Hylidae) in Subtemperate Forests of Southern Brazil Neotropical Biology and Conservation 12(3):181-184, september-december 2017 Unisinos - doi: 10.4013/nbc.2017.123.03 Diet of Aplastodiscus perviridis Lutz 1950 (Anura, Hylidae) in subtemperate forests of southern Brazil Dieta de Aplastodiscus perviridis Lutz 1950 (Anura, Hylidae) em florestas subtemperadas do sul do Brasil Mateus de Oliveira1 [email protected] Abstract Camila F. Moser1 [email protected] Diet studies allow us to understand important questions about a species behavior in rela- tion to resource use. Aplastodiscus perviridis Lutz 1950 is an arboreal anuran that occurs Fernanda R. de Avila1 in southern and southeastern Brazil and western Argentina. In this study, we described [email protected] and analyzed the diet composition of a population of A. perviridis in southern Brazil. We evaluated the diet by examining the gastrointestinal contents of 42 specimens, 12% of Júlia A. Bueno1 which had no gastrointestinal content, while 12 prey categories were registered. Acari- [email protected] na, Araneae, Coleoptera-adults and Lepidoptera-larvae were the prey categories with the largest relative importance values. The trophic niche breadth was lower than those record- 1 Alexandro Marques Tozetti ed for other hylids, suggesting a more specialized character. [email protected] Keywords: prey, niche, behavior, Araucaria forest, predation. Resumo Estudos de dieta permitem compreender questões importantes sobre o comportamento de uma espécie em relação ao uso de recursos. Aplastodiscus perviridis Lutz 1950 é um anuro arbóreo que ocorre no sul e sudeste do Brasil e no oeste da Argentina. Neste estu- do, descrevemos e analisamos a composição da dieta de uma população de A. perviridis no sul do Brasil. Avaliamos a dieta por meio de análise do conteúdo gastrointestinal de 42 espécimes, 12% dos quais estavam sem conteúdo gastrointestinal, enquanto, nos de- mais, foram registradas 12 categorias de presas. Acarina, Araneae, Coleoptera (adultos) e Lepidoptera (larvas) foram as categorias de presas com os maiores valores de importân- cia relativa. A amplitude do nicho trófico foi menor que a registrada para outros hilídeos, sugerindo um caráter mais especializado. Palavras-chave: presa, nicho, comportamento, floresta de Araucária, predação. Introduction Studies on feeding ecology provide basic information about the biology of a species, as well as its position in the food web (Begon et al., 2006). Despite 1 Universidade do Vale do Rio dos Sinos, Laboratório de a recent significant increase in studies on amphibian ecology in the Neotrop- Ecologia de Vertebrados Terrestres. Av. Unisinos, 950, Cristo Rei, 93022-750, São Leopoldo, Rio Grande do ics (Ximenez and Tozetti, 2015), the number of such studies is relatively low Sul, Brazil. regarding the family Hylidae when considering the high diversity of the group. This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International (CC BY 4.0), which permits reproduction, adaptation, and distribution provided the original author and source are credited. Mateus de Oliveira, Camila F. Moser, Fernanda R. de Avila, Júlia A. Bueno, Alexandro Marques Tozetti Diet composition of hylids range from generalist (Van humid subtemperate (cfb in Köppen classification), with Sluys and Rocha, 1998; Barbosa et al., 2014) to special- annual rainfall of 1,412 mm and average annual tempera- ist trends (Parmelee, 1999). It may also vary according ture of 15.2° C, having mild summers and cold winters, to morphological features (Toft, 1981), such as individu- with frequent frost formation (Maluf, 2000). al relative size and the size of prey that can be ingested (Muñoz-Guerrero et al., 2007). The species behaviour it- Data Collection self can also influence the diet, such as changes in prey consumption during the breeding season (Solé and Pelz, We collected the samples in February, September and 2007). This may be related to either the duration of the re- November 2015, using the nocturnal visual search method productive period or the different distances to be traveled (Crump and Scott Jr., 1994). We kept the captured ani- to the reproductive site (Duellman and Trueb, 1994; Solé mals in identified plastic bags and maintained them in a and Pelz, 2007; Barbosa et al., 2014). Species with short refrigerated container to reduce the physiological activi- breeding season, for example, tend to decrease prey con- ties that accelerate digestion. We collected the samples sumption in the reproductive period (Solé and Pelz, 2007). under the collecting permit from the Federal Authority, The arboreal anuran Aplastodiscus perviridis Lutz SISBIO (permit # - 45861-1). After identification, we eu- 1950 (Hylidae) occurs in southern and southeastern Bra- thanized the specimens with topical anesthetic (lidocaine), zil and far west of Argentina. It lives in transition areas fixed them in 10% formalin and preserved them in 70% between forests and open areas (edge) and has a short ethanol. Afterwards, we dissected the animals to remove breeding season going from November to February (Kwet the gastrointestinal tract (stomach and intestine), which et al., 2010). This species has a specific reproductive be- we maintained in 70% ethanol and screened by use of a haviour, in which males display arrangement moves and stereomicroscope. We considered stomach and intestine calls to attract the female to an underground burrow con- contents as a single sample. We identified the extracted structed by the male itself (Haddad et al., 2005). In Rio items (prey) mostly to the taxonomic level of order, except Grande do Sul, this species occurs on the edge of native for hymenopterans, in which we differentiated Formici- grassland areas with Araucaria Forest (with the presence dae from non-Formicidae. When we found unidentifiable of Araucaria angustifolia), using wetlands for breeding prey fragments, we grouped these under “other items”, (Kwet et al., 2010). These grassland and forested areas, of which we quantified only volume. For each identified which are important for animal diversity in general, are item (prey category), wherever possible, we calculated the under threat by human farming activities that convert number, volume and frequency of occurrence in absolute natural areas into crops and apply agrochemicals (Bond- and percentage values. We calculated volume by using the Buckup and Dreier, 2008). area (mm²) occupied by each item with graph paper sup- Except for reproduction studies (Haddad and Prado, port fixed to the bottom of the Petri dish, where we evenly 2005; Haddad et al., 2005; Zina et al., 2007), distribution spread each item, maintaining a regular height of 1 mm notes (Both et al., 2006), taxonomy (Garcia et al., 2001) (Hellawell and Abel, 1971). To calculate the volume (V), and cell biology (Carvalho et al., 2009), studies on the we multiplied the value of the area occupied by each item genus Aplastodiscus are scarce, and there are no records by its height (1 mm) (Barbosa et al., 2014). on feeding behavior. Considering the importance of natu- ral history studies and the limited available knowledge Data Analysis about this genus, the aim of this study was to contribute to filling these gaps, describing and analysing the diet We assessed the importance of each prey in the species’ composition of A. perviridis during the breeding sea- diet using the Index of Relative Importance (IRI): IRI = son in areas associated to Araucaria moist forests in Rio (%N +%P) %FO, where %N is the relative abundance of Grande do Sul, Brazil. each prey in the diet; %P is the mass percentage of each prey in the diet; and %FO is the relative frequency of oc- Material and Methods currence of prey (Pinkas et al., 1971; Krebs, 1999). The higher the value of IRI, the greater is the importance of Study Site each prey in the diet. We calculated the amplitude of trophic niche through We conducted the study in wet areas with shrubby vege- Levins’ Trophic Niche Amplitude Index (B) (Krebs, 2 tation associated with Araucaria moist forests in the munic- 1999), defined by: B = 1 / Σpi , in which p is the propor- ipalities of Garibaldi (29°16’28.8”S and 51°31’40.5”W), tion of individuals of a given resource i (taxon) found Farroupilha (29°12’48.2”S and 51°17’46.4”W) and São in the diet. To facilitate comparisons among species, we Francisco de Paula (29°25’29.6”S and 50°23’20.1”W) in calculated the standardized Levins’ index (Bsta), which southern Brazil. The climate is of the mesothermal type, limits the index on a scale from 0 to 1 according to the 182 Volume 12 number 3 september - december 2017 Diet of Aplastodiscus perviridis lutz 1950 (Anura, Hylidae) in subtemperate forests of southern Brazil following equation: Bsta = (B-1) / (n-1), where n is the bosa et al., 2014). A high consumption of Araneae was number of resources (prey categories) recorded. Values also recorded for Boana pulchella (Duméril and Bibron, near zero are assigned to specialized diet, while those 1841) in coastal areas of Rio Grande do Sul and Uruguay closer to 1, to a generalist diet. (Da Rosa et al., 2011; Oliveira, 2014). Moreover, the pres- ence of Acarina was also identified in the diet of Boana Results raniceps (Cope, 1862) in Pantanal (Sabagh et al., 2010) and of B. pulchella in Uruguay (Da Rosa et al., 2011). We captured 42 males of Aplastodiscus perviridis, in It is worth reminding that, in terms of biomass, it is be- Garibaldi, Farroupilha and São Francisco de Paula (five lieved that this prey category may not be of much impor- without gastrointestinal content, representing 12% of the tance, as mentioned in other studies on Neotropical hylids total sample). Altogether, we found 98 food items classified (Muñoz-Guerrero et al., 2007; Antoniazzi et al., 2013). into 12 categories (Table 1). According to IRI, the most im- The presence of larvae in the diet (Lepidoptera and portant category in the diet was Acarina, followed by Ara- Coleoptera-larvae), which are not very movable prey, sug- neae, Coleoptera-adults, Lepidoptera-larvae, Orthoptera, gests that A.
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