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- W2321880641 abstract "The ecological and reproductive behavior of the cryptic species Hyla chrysoscelis and H. versicolor was examined in two sympatric localities and in one allopatric H. chrysoscelis locality. An analysis of the stomach contents of both species at one locality suggests that proportionately more H. chrysoscelis are eating arboreal insects, and proportionately more H. versicolor are eating terrestrial insects. The two species may be avoiding complete overlap of their niches in this way. There was a significant statistical, although not absolute, difference between the two species in the positions of the males calling around the breeding ponds; H. chrysoscelis tends to call from trees or bushes, while H. versicolor tends to call from the ground. A relationship between the ecological and reproductive behavior is dis- cussed in terms of natural selection working in the same direction for both in each species. Limited relative humidity data, general geographic distribution of the two species, and the ground versus tree differences in food habits and calling position suggest that relative humidity is a key factor involved in these ecological and reproductive differences. It is thought that H. chrysoscelis can tolerate or may prefer lower rela- tive humidities than H. versicolor. Two factors that were thought to affect the trill rates of both species were ana- lyzed. High positive correlations between temperature and trill rate were found in regression analyses for both species. No correlation between body size and trill rate was found for either species. Population differences in the percentage of individuals using either the upper or lower harmonic as the dominant frequency of the mating call may prove to be of significance in the sympatric relations of the two species. Two populations of H. chrysoscelis sympatric with H. versicolor had mean trill rates 7% and 10% faster than the mean trill rate of an alloptric H. chrysoscelis population. It is suggested that reinforcement for differences in trill rate is occurring where the two species are sympatric." @default.
- W2321880641 created "2016-06-24" @default.
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- W2321880641 date "1968-12-10" @default.
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- W2321880641 title "Ecological and Reproductive Differentiation in the Cryptic Species of the Hyla versicolor Complex (Hylidae)" @default.
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- W2321880641 doi "https://doi.org/10.2307/3669222" @default.
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