South American Journal of Herpetology

Publisher: Sociedade Brasileira de Herpetologia


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  • Other titles
    South American journal of herpetology (Online)
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  • Material type
    Document, Periodical, Internet resource
  • Document type
    Internet Resource, Computer File, Journal / Magazine / Newspaper

Publications in this journal

  • South American Journal of Herpetology 04/2014; 9(1):14-19.
  • [Show abstract] [Hide abstract]
    ABSTRACT: We investigated the communicative function of the two notes of the advertisement call of Johnstone’s whistling frog, Eleutherodactylus johnstonei, by broadcasting standard two-note calls and edited one-note calls to males in the field and to females in two-choice trials. We tested the hypothesis that each note has distinct signaling function for each sex such as has been demonstrated for the congener E. coqui. We analyzed phonotaxis in females and changes in duration and dominant frequency of each note and also in call period in the acoustic responses of males. Females were equally likely to approach a source broadcasting a standard call or the second note alone, but rejected sources broadcasting the first note alone. This indicated that the second note mediates female attraction, much as in the congener E. coqui. Male responses indicated that either note is as effective as the standard call in eliciting a change in the dominant frequency of both notes, although the modification is small quantitatively. Male behavior contrasts with that of the congener E. coqui in which the first note alone mediates male competition while the second is apparently neutral. However, we do not rule out a function of the first note in male interactions in E. johnstonei. Other male behaviors suggestive of competition or of an imminent physical interaction (e.g., visual displays, orientation and/or approach toward the sound source) should be analyzed in further studies. Our results partially support the hypothesis of a dimorphic function of each note but are not definitive with regards to male behavior.
    South American Journal of Herpetology 01/2013; 8(2):73-80.
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    ABSTRACT: Female choice in anurans is usually affected by the characteristics of the conspecific advertisement call. Mating preferences of Eleutherodactylus johnstonei females were tested in two-choice experiments in relation to variation of call duration, dominant frequency and call period. Preferences were tested for variants above and below the population mean. Females showed directional preferences for long calls (always preferred the longest call available), and slightly directional preferences for short periods (preferred short over long periods but did not discriminate between short and mean periods). These results altogether indicated a preference for high calling efforts which was corroborated in an additional experiment testing preferences for short calls repeated at short periods (duty cycle: 0.32) over long calls repeated at long periods (duty cycle: 0.19). Preferences for high calling efforts may relate to male quality in territory defense and/or brood care (developing embryos). Females did not prefer calls based on the dominant frequency. This lack of preference may relate to a weak association between male size and call frequency. Female preferences in E. johnstonei partly match those of the congener E. coqui.
    South American Journal of Herpetology 01/2013; 8(1):52-59.
  • South American Journal of Herpetology 08/2012; 7(2):63-78.