Reproductive modes and fecundity of an assemblage of anuran amphibians in the Atlantic rainforest, Brazil

Hartmann, Marília Teresinha; Hartmann, Paulo Afonso; Haddad, Célio F. B.

doi:10.1590/s0073-47212010000300004

Cited by 31 publications

(26 citation statements)

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“…A Floresta Atlântica abriga a maior diversidade de modos reprodutivos, sendo reconhecidos 29 modos , dos quais 14 modos (36%) foram registrados na RNSM. A diversidade de modos reprodutivos na RNSM é menor que a observada em outras localidades da Floresta Atlântica stricto sensu, como por exemplo, Parque Estadual Carlos Botelho (17 modos, Forlani et al 2010), e maior que a observada no Parque Estadual da Serra do Mar, núcleo Picinguaba (10 modos, Hartmann et al 2010). No geral, a diversidade de modos reprodutivos observados nas comunidades de anuros da Floresta Atlântica stricto sensu é superior à observada em áreas de Floresta Estacional Semidecidual (e.g., Vasconcelos & Rossa-Feres 2005), e também em comparação a outros biomas, como a Amazônia (e.g., Crump 1974), Cerrado (e.g., Brasileiro et al 2005), Chaco (e.g., Perotti 1997), Pampa (e.g., Santos et al 2008), Pantanal (e.g., Prado et al 2005) e Caatinga (e.g., Vieira et al 2007).…”

Section: Agradecimentosunclassified

Anuros da Reserva Natural Salto Morato, Guaraqueçaba, Paraná, Brasil

Garey

Hartmann

2012

Biota Neotrop.

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Abstract:Here we present a survey of amphibian species of the Reserva Natural Salto Morato (RNSM), an Atlantic rainforest reserve in Paraná, southern Brazil. We sampled lentic and lotic water bodies, phytotelmata and leaf litter from September 2006 to March 2007. We found 42 species from nine families, one of which is endemic to the study area. Additionally, we recorded 14 reproductive modes. In the RNSM, 50% of anuran species occur in more than 50% of samples, 26% of species occurred between 25 and 50% of samples, and 24% were rare, occurring in less than 25% of samples. The reserve holds the highest diversity of amphibians and reproductive modes in Paraná. Our results emphasize the importance of RNSM for amphibian conservation. Nós registramos 14 modos reprodutivos dos anuros na área de estudo. Na RNSM, 50% das espécies de anuros ocorreram em mais de 50% das amostragens, 26% das espécies foram registradas entre 25-50% das amostragens e 24% das espécies foram raras, ocorrendo em menos de 25% das amostragens. A RNSM até o presente momento é a área com a maior diversidade de anfíbios e de modos reprodutivos do Paraná. Esses fatores evidenciam a importância da RNSM para a conservação dos anfíbios.

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Section: Agradecimentosunclassified

Anuros da Reserva Natural Salto Morato, Guaraqueçaba, Paraná, Brasil

Garey

Hartmann

2012

Biota Neotrop.

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“…The bufonid Rhinella has much larger clutch sizes (R. ornata mean 4222, range 1,477-5,964 eggs; R. icterica range 4,240-25,000 eggs) than S. hayii (mean 1,587 eggs, range 1,063-2,308) and H. bischoffi (mean 826 eggs)(Hartmann, Hartmann, & Haddad, 2010;Pereyra, Candioti, Faivovich, & Baldo, 2015). A similar relationship can be inferred by the regression coefficients for the effect of pool volume on probability of occurrence of frog larvae in our study.…”

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confidence: 99%

The ecology of a system of natural mesocosms: Rock pools in the Atlantic Forest

et al. 2018

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The methodological trade‐off between the realism of natural systems and the tractability of artificial systems has led ecologists to praise the qualities of natural micro‐ and mesocosms as an ideal means for investigating the processes that organise biological communities. Among the different types of naturally occurring micro‐ and mesocosms, clusters of rock pools combine a global distribution with the simplicity, replicability, tractability and structural homogeneity that are desirable in model experimental systems. However, critical geographical data gaps in the study of rock pools must be filled if ecologists are to use these as global model systems in community ecology. In a year‐long study of a cluster of 181 rock pools in the Atlantic Forest of eastern Brazil, we conducted the first study on the ecology of freshwater rock pool communities in the entire Neotropical region, to the best of our knowledge. Building on published descriptions of the factors that drive community assembly within rock pools, we tested the hypotheses (1) that the effects of environmental factors prevail over those of spatial factors and (2) that pool volume and secondarily species interactions between consumers (anuran larvae), resources (leaf litter) and predators (dragonfly larvae) have a dominant role in driving species patterns of occurrence and abundance. Our hypotheses were generally supported as community structure was clearly influenced by the environmental characteristics of individual pools, and not to the spatial relations among them. Pool volume had a consistent, positive influence on the probability of occurrence of dragonflies and tadpoles of three anuran species, possibly through the influence of volume on hydroperiod. However, the species most strongly associated with larger pools were not those with longer times until metamorphosis, but those with larger egg clutches. In addition, species occurrences were positively associated with resource availability as measured by leaf litter mass (significantly so for Rhinella and dragonflies). These observations suggest that within these severely confined freshwater systems, indicators of environmental stability and reduced intraspecific competition could be important ultimate criteria for oviposition site selection. The ease of sampling and manipulating the rock pools at our Atlantic Forest site combined with the observation that these pools are governed by some of the same factors influencing community organisation in other rock pool systems around the world reinforces the merit of the system as a means to conduct global comparative studies of the ecology of communities and metacommunities.

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“…As with the majority of anurans (Hartmann, Hartmann, & Haddad, ; Wells, ), the number of eggs in C. stolzmanni increased with the size of females. This relationship has been shown to be more accentuated in explosive breeders, compared to species with prolonged reproductive seasons (Nali et al., ).…”

Section: Discussionmentioning

confidence: 83%

Random size‐assortative mating despite size‐dependent fecundity in a Neotropical amphibian with explosive reproduction

Székely

Denoël

et al. 2018

Ethology

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Sexual selection theory predicts that, when body size is correlated with fecundity, there should be fitness advantages for mate choice of the largest females. Moreover, because larger males are expected to monopolise the largest females, this should result in an assortative mating based on body size. Although such patterns could be expected in both explosive and prolonged breeders, non‐assortative mating should be more widespread in species under time constraints. However, patterns of sexual selection are largely unexplored in explosive breeding species, and contrasting patterns have been found previously. We expect that the active choice of partners may be particularly risky when the time period during which sexual partners are available is severely limited. Therefore, to avoid missing an entire reproductive act, males and females should pair irrespective of traits, such as body size. We tested this hypothesis by investigating the mating patterns of the Pacific horned toad, Ceratophrys stolzmanni, a short‐lived fossorial species inhabiting Neotropical dry forests. This species is particularly adequate to test our prediction because it reproduces explosively over the course of a single night per year. Although the number of eggs laid was proportional to the size of females, and individuals of both sexes showed variation in body size, there was no assortative mating based either on size, body condition or age of mates. Egg size was not influenced by either female size or clutch size. The larger body size of females compared to males is likely due to fecundity selection, that is, the selective pressure that enhances reproductive output. Although we cannot dismiss the possibility that individuals could select their partners based on other criteria than those related to size or age, the results fit well our prediction, showing that the explosive breeding makes improbable an active choice of partners in both sexes and therefore favours a random mating pattern.

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Reproductive modes and fecundity of an assemblage of anuran amphibians in the Atlantic rainforest, Brazil

Cited by 31 publications

References 31 publications

Anuros da Reserva Natural Salto Morato, Guaraqueçaba, Paraná, Brasil

Anuros da Reserva Natural Salto Morato, Guaraqueçaba, Paraná, Brasil

The ecology of a system of natural mesocosms: Rock pools in the Atlantic Forest

Random size‐assortative mating despite size‐dependent fecundity in a Neotropical amphibian with explosive reproduction

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