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Water conditions influence the detectability of Crossodactylus gaudichaudii (Anura,Hylodidae) in streams of the Atlantic Forest |
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| Authors: | Juliane Pereira-Ribeiro Thais Linause Átilla C Ferreguetti Jonathan Cozer Helena G Bergallo Carlos Frederico D Rocha |
| Institution: | 1. Department of Ecology, Rio de Janeiro State University, Rio de Janeiro, Brazil;2. Department of Biology, Federal University of Espírito Santo, Vitória, Brazil
Contribution: Conceptualization (equal), Data curation (equal), Formal analysis (supporting), ?Investigation (equal), Methodology (equal), Project administration (supporting), Writing - review & editing (equal);3. Department of Biology, Federal University of Espírito Santo, Vitória, Brazil Contribution: Conceptualization (equal), Data curation (supporting), ?Investigation (equal), Methodology (equal), Writing - review & editing (equal);4. Department of Ecology, Rio de Janeiro State University, Rio de Janeiro, Brazil Contribution: Conceptualization (equal), ?Investigation (equal), Methodology (equal), Writing - review & editing (equal);5. Department of Ecology, Rio de Janeiro State University, Rio de Janeiro, Brazil Contribution: Conceptualization (equal), Funding acquisition (lead), ?Investigation (equal), Methodology (equal), Project administration (supporting), Resources (equal), Supervision (equal), Writing - review & editing (equal) |
| Abstract: | Stream-dwelling amphibians' occurrence, behaviour and reproductive success are strongly influenced by dynamic abiotic factors, for example, water flow and spray. These factors can disproportionately affect these frogs due to their dependency on specific favourable conditions for development and incapacity to disperse from unfavourable environments. We analysed the influence of environmental covariates on the detectability of Crossodactylus gaudichaudii, an amphibian species endemic to streams in the Brazilian Atlantic Forest. We conducted sampling in the streams of the Duas Bocas Biological Reserve, Brazil, and we measured air and water temperature, air humidity and pH of water on each sampling occasion. We estimated the effects of variables on the detectability of the species using single-season occupancy models. Our results indicated that the detectability of the species increases on occasions with higher water temperatures (24–26°C) and lower pH (5.0–5.5). We investigated the influence of these covariates only on the detectability of adult frogs, but it is likely that the physiochemical properties of stream water are more important to aquatic larvae, and hence, the probability of their detection. Given this, further studies should examine the relevance of covariates on the detectability of adult frogs as well as larvae. |
| Keywords: | amphibians detection frogs modelling occupancy pH temperature |