Diet, Diel Activity Pattern, Habitat Use, and Reproductive Effort of<i>Hylodes nasus</i>(Anura: Hylodidae) in One of the World's Largest Urban Parks (Tijuca National Park), Southeastern Brazil

Machado, Aricia de Oliveira; Winck, Gisele R.; Dorigo, Thiago Arnt; Rocha, Carlos Frederico Duarte

doi:10.2994/sajh-d-16-00004.1

Cited by 12 publications

(6 citation statements)

References 29 publications

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“…The low amount of plant matter in the frog's diet probably corresponds to plant parts ingested during attempts to capture prey, as has been suggested also for the diet of many other frog species (e.g. Martins et al 2010, Machado et al 2016.…”

Section: Discussionmentioning

confidence: 75%

Ecological and reproductive aspects of Aparasphenodon brunoi (Anura: Hylidae) in an ombrophilous forest area of the Atlantic Rainforest Biome, Brazil

Gomez-Mesa¹,

Pereira‐Ribeiro²,

Ferreguetti³

et al. 2017

Zoologia

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Presented is the first information on the ecological and reproductive aspects of the treefrog, Aparasphenodon brunoi Miranda-Ribeiro, 1920, living in ombrophilous forest areas of the Atlantic Rainforest, Brazil. We recorded the species' daily activity and over the course of a year, population density during the year, microhabitat usage, diet, and some reproductive features (quantity, diameter and mean mass of oocytes, mean reproductive effort of female). Field sampling was conducted monthly from June 2015 to July 2016. Searches for treefrogs were systematic, using visual encounter surveys along 14 plots RAPELD long term research modules established in the forest. For each captured individual, we recorded the hour, microhabitat used, and perch height. The diet of the population was ascertained based on 15 individuals collected outside the study plot areas. Treefrogs used seven different types of microhabitats in the forest but the preferred microhabitats were tree-trunks and lianas. The amount of accumulated rainfall and air temperature interacted to explain the number of A. brunoi individuals active throughout the year. The reproductive strategy for females of this comparatively large arboreal frog in the ombrophilous forest is to produce clutches with a large number (900.8 ± 358.1) of relatively small-sized eggs. We conclude that in the ombrophious forest of the Vale Natural Reserve, A. brunoi is a nocturnal arboreal treefrog active throughout the year but activity increases during the wet season as a result of increased precipitation. In the forest, treefrogs tend to perch mainly on tree-trunks and lianas about 1 m above ground, where it feeds preferably on relatively large bodied arthropod prey. When living in the ombrophilous forest of the Atlantic rainforest, A. brunoi may change some features of its ecology (e.g. marked difference in the use of bromeliads) compared to when living in restinga habitats.

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Section: Discussionmentioning

confidence: 75%

Ecological and reproductive aspects of Aparasphenodon brunoi (Anura: Hylidae) in an ombrophilous forest area of the Atlantic Rainforest Biome, Brazil

Gomez-Mesa¹,

Pereira‐Ribeiro²,

Ferreguetti³

et al. 2017

Zoologia

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“…Because H. fredi is a well known diurnal frog (Hatano et al 2002), we did not perform nocturnal surveys, which would probably show a different occupation pattern when frogs are inactive. Individuals of some Hylodes species, such as H. phyllodes (Heyer et al 1990) and H. nasus (de Oliveira Machado et al 2016), are known to remain perched on vegetation when inactive during the nocturnal period, a way of occupation considerably different from when they are active.…”

Section: Discussionmentioning

confidence: 99%

“…1990) and H . nasus (de Oliveira Machado et al . 2016), are known to remain perched on vegetation when inactive during the nocturnal period, a way of occupation considerably different from when they are active.…”

Section: Discussionmentioning

confidence: 99%

Factors influencing fine-scale occupancy and detectability of an insular Atlantic Forest frog

et al. 2023

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Context Species of the tropical frog Family Hylodidae tend to be restricted to streams and, hence, have a small occupancy area. Hylodes fredi (Canedo and Pombal 2007), a diurnal stream-dwelling species endemic to the Atlantic Forest in Ilha Grande, south-eastern Brazil, is one such species. Because of scarce population studies, it is also categorised as Data Deficient (DD) in the IUCN Red List. Previous studies on the habitat use by this species did not account for imperfect detection, which could have led to biased results. Aims We aimed to systematically describe the microhabitats occupied by H. fredi, by generating a fine-scale occupancy model while accounting for imperfect detection. Methods We sampled six streams where the species is known to occur. Perpendicular transects were established in each stream and further subdivided into 10 sampling plots. Single-species and single-season occupancy models were created with the UNMARKED R package, and model selection was performed on the basis of the Akaike information criterion. Key results We observed the species in 70 of the 275 sampled sites, which resulted in a naïve occupancy of 0.28 and detectability of 0.25. The best models suggest that H. fredi occupancy increases positively with rock cover and inversely with leaf-litter cover. Detectability reduced with an increase in leaf litter cover and varied with the air temperature. Conclusions We conclude that H. fredi occupancy is affected by the presence of rock and leaf-litter cover. The data indicated that the species is restricted to the stream channel and does not seem to occupy forested areas that are distanced from the stream margins. Implications Considering that H. fredi and many other congeneric species are listed as ‘Data Deficient’ in the IUCN Red List, it is important to define a threat category so as to conserve them. Many stream-associated species tend to have their occupancy overestimated, leading to an underestimation of their threat risk. This study systematically demonstrated that H. fredi has a strict and reduced occupancy, mostly limited to the stream margins, that should be considered when determining conservation efforts for this and ecologically similar species.

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“…Thus, we suggest that the models here indicate important aspects of the ecology of H. heyeri , and that these must be taken into consideration in further studies. The greater number of captures during the warm, rainy season is to be expected, as those are the same months of reproduction when behaviour can call attention to males that are displaying (Almeida‐Gomes et al, 2007; Haddad & Giaretta, 1999; Hatano et al, 2002; Machado et al, 2016). In the study region, rainfall, with long‐term averaging, has a seasonal component to it, in any given year it is not tightly linked to temperature and is unpredictable (Marques et al, 2004).…”

Section: Discussionmentioning

confidence: 99%

Population size and survival of the Brazilian Torrent Frog Hylodes heyeri (Anura, Hylodidae)

2022

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Population dynamics are influenced by environmental variability and understanding the abundance and persistence of individuals and populations is a fundamental goal of population ecology. Thus, estimating demographic parameters to identify the factors important for population variability is required to understand temporal and spatial dynamics. The stream‐living diurnal frog Hylodes heyeri is endemic to the Atlantic Forest of Brazil in the states of Paraná, São Paulo and Santa Catarina. Here we use capture‐mark‐recapture methods to estimate survival rates and population size of this Brazilian Torrent Frog in Pico do Marumbi State Park, Paraná. We used CJS models for an open population to estimate apparent survival, capturability and population size in two streams. The number of captures during each session was positively correlated with the minimum weekly temperature. Despite that correlation, the most parsimonious model of survival and capturability was the constant model for both parameters, resulting in a monthly survival rate of 0.38 (95% CI = 0.30–0.46). Thus, only the abundance of the frog differed in the two streams (79 vs. 36), with the population size estimate of 187 individuals. Reproduction is seasonal in the Brazilian Torrent Frog and so the low monthly survival rate suggests that animals move over time rather than die, because 38% month−1 survival should result in <1% of the population remaining after 5 months. Thus, researchers must recognize that populations are labile and individuals often move or are washed downstream during heavy rainfall, generating apparently rapid local turnover that is unlikely to reflect true mortality.

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Diet, Diel Activity Pattern, Habitat Use, and Reproductive Effort ofHylodes nasus(Anura: Hylodidae) in One of the World's Largest Urban Parks (Tijuca National Park), Southeastern Brazil

Cited by 12 publications

References 29 publications

Ecological and reproductive aspects of Aparasphenodon brunoi (Anura: Hylidae) in an ombrophilous forest area of the Atlantic Rainforest Biome, Brazil

Ecological and reproductive aspects of Aparasphenodon brunoi (Anura: Hylidae) in an ombrophilous forest area of the Atlantic Rainforest Biome, Brazil

Factors influencing fine-scale occupancy and detectability of an insular Atlantic Forest frog

Population size and survival of the Brazilian Torrent Frog Hylodes heyeri (Anura, Hylodidae)

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