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Volume 2012 (2012), Article ID 928371, 7 pages
Comparison of the Ant Assemblages in Three Phytophysionomies: Rocky Field, Secondary Forest, and Riparian Forest—A Case Study in the State Park of Ibitipoca, Brazil
1Pós-Graduação em Comportamento e Biologia Animal, Instituto de Ciências Biológicas, Universidade Federal de Juiz de Fora, Campus Universitário de Martelos, 36.036-330 Juiz de Fora, MG, Brazil
2Pós-Graduação em Ecologia, Instituto de Ciências Biológicas, Universidade Federal de Juiz de Fora, Campus Universitário de Martelos, 36.036-330 Juiz de Fora, MG, Brazil
3Departamento de Produção Vegetal, UNESP, Faculdade de Ciências Agronômicas, Caixa Postal 237, 18.603-979 Botucatu, SP, Brazil
Received 13 September 2012; Revised 23 October 2012; Accepted 25 October 2012
Academic Editor: Kleber Del-Claro
Copyright © 2012 Juliane Floriano Santos Lopes et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Ant assemblages are almost all related with the vegetation composition and so can provide us important information for conservation strategies, which are especially relevant to an environmentally protected area. We sampled the ant fauna in three different phytophysionomies in order to verify if the composition of ant species is different among the areas, especially because one of the areas is a Rocky Field and there is little information about the ant fauna in this habitat. A total of 8730 individuals were registered and an NMDS analysis showed that the ant assemblies are different at the three phytophysionomies (Rocky Field, Riparian Forest, and Secondary Forest). This study shows that the species that compose the ant assemblies in different phytophysionomies are a reflex of the environment, supporting the hypothesis that the vegetational composition results in different compositions in the ant assembly. Vegetal composition is determinant in the formation of the litter and consequently in the occurrence of ant species that depend on this layer of organic matter for nesting and foraging.
Ants exert important effects in most ecosystems due to their abundance, population stability, and foraging activity [1, 2]. Some of their main activities are the nutrient cycling and control of other invertebrate populations . They also participate actively in the composition of vegetation through seeds dissipation [4, 5], which gives them great importance in recovering degraded areas .
Besides their ecological importance, the Neotropical ants fauna are still little studied, especially if we consider the region of “Mata Atlântica” (Atlantic Forest) which occupies only 7% of its original area, according to the Ministry of Environment data . Studies made in this biome indicate a high diversity of endemic species, which may comprise 50% of total species and 95% in certain groups [8, 9].
Actually in recent years, myrmecologists attention has been concerned essentially with ant communities, ant-plant relations, mutualisms, biomonitoring, biogeography, morphology and anatomy, genetics and cytogenetics, and taxonomy . Ant species inventories made in Brazil are used to evaluate the conservation state of the environments, especially in fragmented areas, as the Atlantic Forest . Also, according to Delabie et al.  perusal of recent papers indicates there are still new ant species to be described in Neotropical.
Inserted in the Atlantic Forest Biome, the State Park of Ibitipoca (PEIb) is classified in the category of “Extreme Biological Importance” because of endemism of some species, the relevance, the speleological singularity, and the diversity of habitats . This park occupies an isolated hilly area from other areas of Rocky Field, presenting a distinctive flora of “Cadeia do Espinhaço” itself, being considered a disjunction concerning this Range .
PEIb presents significant diversity not only of vegetation, but also of fauna, landforms, soils, and microclimates  and covers two areas of regional vegetation, originally composed by semideciduous seasonal forests and “cerrados” . It may be distinguished by five basic types of phytophysiognomies—altitude “cerrado”, Rocky Fields, Riparian Forest, capon of forest, and an area of dense ombrophilous secondary forest.
The Rocky Fields are distinguished mainly by the grassland vegetation consisting of grass, herbs, and shrubs on outcrops of quartzitic rocks associated to shallow soils and high solar incidence . The PEIb floristic studies indicate predominance of “candeia” specimens (Vanillosmopsis erythropappa).
The Semideciduous Secondary Forest covers an area of 90 hectares at the south of the PEIb and it is totally surrounded by woodlands, being named “Mata Grande.” Due to the presence of anticlinal crests, this environment is greatly influenced by clouds, winds, and lightning . There is marked abundance of epiphytic plants and lichens, with predominance of high trees (up to 25 m) .
The Riparian Forest in its extension mostly consists of shrubs patches that accompany the distribution of thicker soils, in slope conditions or concave lands. This subtype of vegetation is humid, with reduced wind action and remarkable presence of bromeliads and mosses and, in the edges or less shaded areas, many kinds of lichens .
Considering that the vegetation is a good predictor of the structure of community of ants [20–23], one could suppose that in different phytophysionomies the composition of ant species is equally distinct. In this context, a comparison of ant assemblies in three distinct phytophysionomies was accomplished—Rocky Field, Semideciduous Secondary Forest, and Riparian Forest—in the PEIb. The knowledge of how the ant species composition varies according to different characteristics of habitat provides important information for conservation strategies, which are especially relevant to an environmentally protected area.
2. Material and Methods
2.1. Area of Study
This study was conducted in the State Park of Ibitipoca—PEIb (21°40′44′′ S and 43°52′55′′ W) in the city of Lima Duarte, Minas Gerais, Brazil (Figure 1). The PEIb has approximately 1.488 ha with a mesothermic humid climate (Köppen classification), with dry winters, pleasant summers, and average annual temperature around 18.9°C. The influence of the relief over the climate is very important, because the altitude and topography are differentiated and the anticlinal crests in the PEIb stand out locally concerning the neighboring areas, leading to a differentiated climate in the area . In the PEIb three phytophysionomies were sampled: Rocky Fields (RKF), Semideciduous Secondary Forest (SSF), and Riparian Forest (RPF).
2.2. Ants Sampling
In each of the three phytophysionomies, three quadrants of 800 m2 each were established. The minimum distance between the quadrants within the same phytophysionomy was 50 m. The sampling of ants was accomplished monthly between July and December 2008.
In each quadrant three parallel transects were established, spaced from each other by 10 m. Along each transect the sampling points were determined apart from each other also by 10 m, in a total of 15 samples/quadrant. In each transect a different method was employed, as follows: honey and sardine attractive baits, pit-fall traps, and extraction in Berlese funnel of litter samples.
The baits contained 5 g of a mixed paste of honey and sardine (1 : 1 vol), distributed over paper tissues. The baits remained in the field for 60 min , after been collected for screening. Pitfall traps consisted of 500 mL plastic cups filled with 200 mL of water and liquid neutral detergent (10%). Pitfall traps remained in field for 24 h. Litter samples were standardized with a plastic grid of 0.25 m2 on soil. The litter was put in Berlese funnel for 48 h for screening material.
In the quadrants of Rocky Fields, the pitfall traps and the litter samples were replaced by the attractive bait, considering the impossibility of using these methods, because litter is absent in the Rocky Fields and the installation of pitfalls under the rock is infeasible.
Collected ants were sorted, counted, and stored in alcohol 90%, recording phytophysionomy, method, and date of collect. After, a taxonomic identification was made under stereoscopic microscope (Leica), from dichotomous keys [25, 26]. Ants were coded at genera level and separated in morph-species. Dr. Rodrigo Feitosa from the Museum of Zoology of São Paulo confirmed the species identification. The specimens were mounted and deposited in the thematic collection of MirmecoLab, ICB-UFJF (Campus Universitário, Cidade Universitária-s/n, Juiz de Fora-MG, CEP: 36036900).
2.3. Data Analysis
To evaluate the sampling effort, we constructed a rarefaction curve , using the program EstimateS . Sample-based rarefaction curves indicate that sampling effort was significant for three phytophysionomies (Figure 2).
The content of five samples per method of collect was grouped to obtain a single sample for each transect in each quadrant. To compare the ant species composition from different phytophysionomies, we used multivariate analysis with the program PAST . Data were organized in a binary matrix, considering the taxonomic level of genera (presence and absence) and submitted to nonmetric multidimensional ordination (NMDS). The dissimilarity between the phytophysiognomies was calculated through the Bray-Curtis index, which is less affected by the occurrence of rare species in the samples . The stress index calculated by NMDS is a measure of goodness-of-fit .
Also a one-way analysis of similarity was applied (one-way ANOSIM), with 10 thousand permutations. This analysis compares the differences between the averages of the ranked similarities among the samples within and between the phytophysiognomies, verifying if there are significant differences in the composition of genera. ANOSIM generates a statistic , which is a measure of dissimilarity between the areas. values near zero indicate high similarity while values near 1 indicate low similarity . To calculate ANOSIM, the Bray-Curtis index was also used and each value has its corresponding probability.
A similarity percentage test (SIMPER) was applied, which permits to determine which genera more contributed to discriminate among assemblies. SIMPER analysis provides a percentage of dissimilarity among the phytophysiognomies, presenting a percentage of contribution of each genera for such dissimilarity .
A total of 8.730 individuals were collected, belonging to 46 species, 20 genera, and eight subfamilies: Ecitoninae, Ectatomminae, Heteroponerinae, Ponerinae, Formicinae, Dolichoderinae, Pseudomyrmecinae, and Myrmicinae, providing a list of ant species that occur in the PEIb (Table 1).
The greatest number of species was recorded for Riparian Forest, followed by Rocky Field and Secondary Forest, listing as exclusive species of Riparian Forest: Pheidole sp6, Strumigenys louisianae, Brachymyrmex sp2, Paratrechina sp1, and Labidus sp1. As unique species of Rocky Field are listed up: Cephalotes pusillus, Brachymyrmex sp3, Camponotus genatus, Myrmelachista sp2, Myrmelachista sp3, and Pseudomyrmex sp1; and in the Secondary Forest: Brachymyrmex sp1, Myrmelachista sp1, and Hypoponera foreli (Table 1).
Among the 19 ant species shared within the three studied areas, the most representative genera were Pheidole (7 species), Camponotus (4 species), and Hypoponera (3 species). We highlight the Camponotus absence in the Secondary Forest and the exclusive occurrence of each one of the three Brachymyrmex species in each phytophysionomy (Table 1).
Ant species composition in the three phytophysionomies differed significantly. (ANOSIM, , ), being more similar to the samples belonging to the same phytophysionomies (Figure 3, Table 2). The ordination NMDS indicates a stress value of 0.16, with the coordinates 1 and 2 explaining 48% and 26% of data variation, respectively. Actually, the greatest values of dissimilarity were verified between the Secondary Forest and the Rocky Fields (Table 3), being their samples, respectively, separated by coordinate 1.
According to the SIMPER test, the genera that most contributed for the dissimilarity among the phytophysionomies were Crematogaster and Myrmelachista which are responsible for 66.58% of the variation of species composition among the phytophysionomies (Table 4).
The phytophysionomies showed differences in the composition of ant species, especially between SSF and RKF (Figure 3), evidencing the relationship between the vegetation and the ant fauna.
The SSF presents larger diversity of vegetal species, with genera of the families Rubiaceae, Lauraceae, Myrtaceae, Euphorbiaceae, Nyctaginaceae, Melastomataceae, Annonaceae, Palmae, Apocynaceae, and Monimiaceae . This vegetation composition promotes the litter formation and, consequently the occurrence of cryptic ant species that depend on this layer to their nesting and foraging .
Actually we sampled seven and six cryptic ant species at SSF and RPF, respectively, while there are just four cryptic ant species at RKF. We pointed out that among these four cryptic species at RKF, two of them are arboricolous (Myrmelachista) , so they are not litter-dependent for nesting or foraging.
The Rocky Field presents characteristics completely different from the other areas. With a rocky soil, this open environment has a predominance of small trees with extra floral nectaries, especially of the genera Vanillosmopsis (“candeia”). Also the lack of nearby water bodies makes this phytophysionomy a hostile environment. According to Campos , rocky and sand exposed at the top of these fields are among the most extreme combinations of an environment. Mountainous areas, on which are found the rocky fields, are comparable to islands separated by very different ecological conditions . The occurrence of arboreal ant species that present association with plants (Crematogaster, Cephalotes, Pheidole, Camponotus, Myrmelachista, Linepithema, and Pseudomyrmex) is a reflex of Rocky Field characteristics.
We emphasize the high frequency of Camponotus in the Rocky Field in contrast to its absence in the Secondary Forest. Camponotus is cited as the most frequent in open habitats such as sandbanks , “cerrado” [37–39], and “caatinga” . This study includes Rocky Field as a habitat that allows to its occurrence. The absence of Camponotus in the Secondary Forest could be related to the achievement of collects exclusively in soil, combined with the high scale of the vegetation in this area.
Besides Camponotus, Brachymyrmex is also noteworthy, given the observed spatial segregation in which each of the three species was exclusively sampled in one of the areas. This spatial segregation can be explained given the high level of aggression recorded for the genera, even in intraspecific interactions .
For Riparian Forests the values of dissimilarity are near 50% and can be considered as a transition range between the two other phytophysiognomies, agreeing with the spatial location of this habitat in the PEIb (Figure 1) and with the presence of specialist (e.g., Acromyrmex, Labidus), invasive (e.g., Solenopsis, Paratrechina), and cryptic ant species (Strumigenys).
This study shows that the species that compose the ant assemblies in different phytophysiognomies are a reflex of the environment, especially of the plant species, supporting the hypothesis that differences in the vegetational composition result in different compositions in the ant assembly.
Also the vegetational composition is determinant in the formation of the litter and consequently in the occurrence of ant species that depend on this layer of organic matter for nesting and foraging as the cryptic ant species . Obtained data suggest that determination of ant fauna in the Secondary Forest and Riparian Forest is dependent of the conditions and resources provided by these phytophysiognomies, for instance, the presence of litter, shaded areas, and high trees. Unlike, in the Rocky Field, it is expected that the competition is the most important factor in determining the species that compose the assembly, considering the absence of litter, high insolation, and scarcity of resources.
The authors thank the Instituto Estadual de Florestas (IEF) from Minas Gerais State and the Parque Estadual do Ibitipoca Administration for allowing the research and for facilities in the Park, especially to João Carlos Lima de Oliveira and Clarice Nascimento Lantelme Silva. The IBAMA for permission to collect the ants, R. Feitosa for identifying the ants at the taxonomic level of species, FAPEMIG (Fundação de Amparo a Pesquisa do Estado de Minas Gerais) (Proc. APQ 00411-08) for funding and CNPq for the Grant to the first author (Proc. 307335/2009-7). The authors declare that they have no conflict of interests.
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