Environmental and social factors affecting calling behavior of Hylodes nasus Lichtenstein (1823) (Amphibia, Anura) at a stream in Tijuca Forest, Rio de Janeiro, Brazil
DOI:
https://doi.org/10.5216/rbn.v16i1.46904Keywords:
Social behavior, population structure, rheophilic habitAbstract
The calling activity of anurans is influenced by local environmental (e.g. temperature, rainfall, humidity and photoperiod) and social factors (calling activity). This study investigated the influence of air temperature, humidity, rainfall and speed water flow on acoustically active individuals’ abundance and frequency of notes per minute of Hylodes nasus, as well as these biotic variables influence each other in Atlantic Rain Forest. Direct observations were carried out with two monthly expeditions from March 2007 to February 2008, in the interval from 7:00h to 17:00h. Calling activity was positively associated with air temperature and monthly rainfall, negatively associated with humidity and speed water flow, and without influence with accumulated rainfall (24h). The acoustically active individuals’ abundance was positively influenced with frequency of notes per minute. The results may contribute to improve understanding of variables that influence anuran population structure with rheophilic habit and the role of each analyzed variable.
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