Tremulation display in male agonistic behavior of the black-eyed leaf frog (Agalychnis moreletii: Hylidae).

Abstract

-The black-eyed leaf frog (Agalychnis moreletii) is a critically endangered hylid frog restricted to humid lowland and lower montane forests of southern Mexico and northern Central America. Very few reports exist on wild reproductive behavior of this species. Lower body tremulation display has been reported as a relevant part of agonistic interactions between males of the related species A. callidryas but has never been reported in other species of Agalychnis. Herein, we present the first report and description of this tremulation display among males of A. moreletii in a lower montane forest of Guatemala. Based on our observations, we suggest that this display may serve to prevent physical confrontations among males and might play an important role in defining territories. We also suggest that the difference in fundamental frequency of the tremulations between A. moreletii and A. callidryas may serve to avoid confusing signals between species where they breed sympatrically.

Acoustic Repertoire and Calling Behavior of the Gliding Treefrog, Agalychnis spurrelli (Anura: Hylidae)

“…He described the chuckle call as having 3-5 notes, with duration of 0.35 s, and dominant frequency of 1,285 Hz and the "soft tlock call" as a single note of 0.028 s duration and mean dominant frequency of 1,565 Hz. As in A. callidryas, males of A. moreletii use tremulation displays and aggressive chuckle calls during agonistic interactions that might be important to defend territories or calling sites (Serrano et al, 2018). In A. saltator, Roberts (1994) reported that during breeding aggregations males produced a "soft squeaking and chuckling noise" that differed from the advertisement call.…”