Análises ecológicas no R

Silva, Fernando Rodrigues da; Gonçalves‐Souza, Thiago; Paterno, Gustavo Brant; Provete, Diogo B.; Vancine, Maurício Humberto

doi:10.52050/9788579175633

Cited by 6 publications

(7 citation statements)

References 152 publications

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“…To investigate whether the diet of T. miliaris varied between the two sampled mountain ranges (Serra do Mar and Serra da Mantiqueira), we conducted a permutational analysis of variance (PERMANOVA) using the abundance ( N ) of each consumed prey category (Santana et al, 2019). This method enables testing of hypotheses and comparing species abundance across different environments using non‐normally distributed data (Silva et al, 2022). To assess whether the geographic distance influenced prey availability in the environments, we performed a Mantel test using the frequency ( F ) data for each prey category found in the sampling points for both mountain ranges.…”

Section: Methodsmentioning

confidence: 99%

Trophic ecology of Thoropa miliaris (Anura: Cycloramphidae) in two mountain ranges of south‐eastern Brazil

et al. 2023

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Among populations of the same species, the diet composition varies depending on the environment, given the variation in diversity and abundance of available prey. Since Thoropa miliaris is a habitat specialist in reproduction, we tested the hypothesis that this specialization is also verified in its diet. We carried out the work in 10 localities in Serra do Mar and Serra da Mantiqueira, south‐eastern Brazil, where we collected frogs and evaluated prey availability. The environment did not provide significant variation in the diet of T. miliaris, and Formicidae was the prey category selectively consumed in greater volume, frequency and abundance in both mountain ranges. Therefore, we can state that T. miliaris has a selective diet on ants.

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Section: Methodsmentioning

confidence: 99%

Trophic ecology of Thoropa miliaris (Anura: Cycloramphidae) in two mountain ranges of south‐eastern Brazil

et al. 2023

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“…First, the larval composition assemblage data ( i.e ., family‐level identification) were standardized using the Hellinger coefficient, which takes into account the weight of both high and low abundances (Borcard et al ., 2018b; Legendre & Gallagher, 2001). Subsequently a dissimilarity matrix based on Bray–Curtis distances was constructed using the Hellinger‐transformed data (Borcard et al ., 2018a; Legendre & Gallagher, 2001; Silva et al ., 2022b). The dissimilarity matrix of the fish larval composition was the response variable, and the spatial variable, sampling sites and phases of the hydrological regime were the predictor variables.…”

Section: Methodsmentioning

confidence: 99%

Spatial and seasonal distribution of fish eggs and larvae in one free‐flowing river in the Neotropical savanna

Carnicer

Lima

Taguti

et al. 2023

Journal of Fish Biology

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Reproduction is one of the most important biological aspects for the maintenance of viable populations, and understanding the spatial and seasonal patterns in the reproduction of Neotropical fish is a point that still needs considerable investigation. In this study, the main aim was to reduce knowledge gaps concerning fish eggs and larvae distribution patterns. Therefore, the River Araguaia basin, one of the main hydrographic basins of the Neotropical savanna, was used as the focal point of study. Samplings of fish eggs and larvae were carried across the hydrological regime during flooding and drought events between December 2018 and July 2020 at 15 sites distributed along a 350 km stretch of the River Araguaia basin. Fish eggs and larvae were found in all sampling sites, with the highest number of catches in the flood season. The fish larvae were represented by 5 orders, 22 families and 22 at the genus or species level. Both environments, tributary and main channel of the River Araguaia, are important for fish reproduction, and no difference was found in the use between the main channel and the tributaries. The results showed that spatial factors are important to explain the change in larval composition, which may have a wide or restricted distribution related to specific habitats. The main factors related to the reproductive activity of fish in this region are the physical and chemical changes in the water that occur in the flood season. These results indicate that the River Araguaia basin has environmental integrity and provides favourable conditions for the reproductive activity of fish, including long‐distance migratory species. Considering this, mitigate measures that guarantee the preservation of the natural flow are crucial for the maintenance of fish biodiversity.

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“…Beta functional diversity was also considered in the analysis. It represents a measure of comparison of composition and variation of species functional traits between two or more sites (Silva et al 2022). Therefore, we calculate (1) the total beta diversity of the functional traits and their partitions into (2) turnover, a measure of species and trait replacement between sites, and (3) nestedness, representing the loss of species and traits between sites along a gradient (Baselga 2010;Villeger et al 2013) (Supporting Information 3).…”

Section: Beta Diversity and Functional Diversity Indexesmentioning

confidence: 99%

“…The decline in species richness has been widely observed (Jiguet et al 2010;Correll et al 2019) and is often related with changes in land cover. Until the 1990s, ecological theory investigated which processes determined species abundance and richness in space and time (Silva et al 2022). However, species richness alone could not reveal the whole story about the biodiversity of an area; actually, this only provides an estimate of the species number (Han et al 2021).…”

Section: Introductionmentioning

confidence: 99%

Forest cover and environmental type shape functional diversity of insectivorous birds within the Atlantic Forest

Manzoli

Gaspar

Melo

et al. 2023

Preprint

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Arthropod-eating birds are a heterogeneous group, with different levels of environmental sensitivity and diverse responses to habitat degradation. In this paper, we tested the effects of landscape on the functional diversity of insectivorous birds within the Brazilian Atlantic Forest. We predict that (I) species composition and functional diversity are shaped by turnover and nestedness across different habitats, and (II) the gradient of forest cover has a positive effect on bird species composition and functional diversity. We used data from 22 landscapes of the Atlantic Forest in the Cantareira-Mantiqueira region (Brazil), within buffers of 1 km radius, surrogating three types of environments (i.e., forests, pastures, and swamps). The components of β-functional diversity were calculated using the beta pair and beta multi-function for each type of environment, and the effects of the forest cover gradient and environment type were tested using linear models and GLMM, respectively. Our results showed that the forest cover gradient and the type of environment had a negative effect on the indices of functional diversity, contrary to our expectations. Pasturelands and marshes were susceptible to turnover and nestedness, respectively. The beta diversity of forests was influenced by both species nestedness and turnover. The regional native forest fragments are generally small-sized, and in early successional stages, which could explain the patterns we found. The presence of secondary forests may have affected the expected pattern of functional diversity, therefore, caution is needed when interpreting this, since the way in which compensatory dynamics may not involve real functional compensation.

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Análises ecológicas no R

Cited by 6 publications

References 152 publications

Trophic ecology of Thoropa miliaris (Anura: Cycloramphidae) in two mountain ranges of south‐eastern Brazil

Trophic ecology of Thoropa miliaris (Anura: Cycloramphidae) in two mountain ranges of south‐eastern Brazil

Spatial and seasonal distribution of fish eggs and larvae in one free‐flowing river in the Neotropical savanna

Forest cover and environmental type shape functional diversity of insectivorous birds within the Atlantic Forest

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