![]() ![]() Since the Co note is used by males to indicate their calling location to other males, we suggest that frogs from the low site produce a less intense Co note to accommodate their higher population density. It is known that the density of calling males is greater at the low site than at the high site. In contrast, the Qui notes of males from the two sites were similar in average intensity (97 dB SPL for the low site vs 100 dB SPL for the high site). The high site population with its larger males, produced a mean Co note intensity of 92 dB SPL vs 84 dB SPL for the low site population. At the low site, Co note intensity was proportional to body size but Qui note intensity was independent of it. At the high site, larger males produced more intense Co and Qui notes than smaller males. Body size was then correlated with the intensities of the Co and Qui notes in the two populations. ![]() It was found that snout‐vent lengths of males from the high site (700 m) were significantly greater (P < 0.001) than those of males from the low site: (350 m). The measurements were made at 50 cm directly in front of a calling male using a one‐third octave filter with center frequencies of 10 Hz corresponding to the frequencies of the first (Co) and second (Qui) call notes. coqui) from populations at two altitudes in the Puerto Rican rain forest. Callnote is the leading video call recorder that gives you the power to polish your clips with a complete set of editing tools. Peak sound levels were measured of the two‐note advertisement call of male treefrogs ( E. ![]()
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