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507 results for “treefrog”

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zenodo36/100

Figure 3 in Geographic variation in the acoustic signals of lesser treefrogs Dendropsophus minutus (Anura, Hylidae)

Figure 3. Variation in frequency (PC1) and bandwidth (PC2) of Dendropsophus minutus calls as a function of longitude. Mean trend lines and confidence intervals (95%) are shown. Each point represents the average acoustic parameter for each note type on each recording (i.e., individual).

opencc-by-nc-4.0May 2024View details →

dryad36/100

Developmental changes in red-eyed treefrog embryo behavior increase escape-hatching success in wasp attacks

The arboreal embryos of red-eyed treefrogs (Agalychnis callidryas) hatch prematurely to escape from egg-predators, and escape success increases with age. We assessed developmental changes in the behavior and hatching performance of embryos attacked by wasps (Polybia rejecta) and their contributions to improved embryo survival. We recorded videos of 4- and 5-day-old embryos exposed to wasp attacks and determined each embryo's fate. For a stratified random sample of embryos that escaped and died, we determined the occurrence, sequence, and timing of events during wasp-embryo interactions. We constructed path diagrams of event sequences, tested for age effects on transition probabilities, and measured durations of periods between key events. Overall escape success was 38% higher in older embryos. They were more likely to hatch pre-emptively than younger ones, thus less likely to experience direct attacks, suggesting that developmental gains in mechanosensory sensitivity may increase hatching responses to indirect cues. During direct attacks, embryos were equally likely to be captured by wasps at both ages and hatching speed was similar, suggesting no relevant difference in escape-hatching performance. After a wasp ruptured their egg capsule, older embryos were more likely to exit and did so much sooner; younger embryos remained in ruptured capsules for longer and were more likely to be attacked again. This developmental change in embryo behavior indicates decreased tolerance for egg-stage risk as the chance of tadpole survival increases, suggesting that ontogenetic adaptation to changing risk trade-offs contributes strongly to the developmental increase in escape success.

opencc-zeroMar 2023View details →

zenodo36/100

Figure 6 in Litoria aplini sp. nov., a New Species of Treefrog (Pelodryadidae) from Papua New Guinea

Figure 6. Map of Papua New Guinea showing the type locality of Litoria aplini.

opencc-by-4.0Nov 2020View details →

dryad36/100

Data from: phenology and environmental determinants of explosive breeding in gliding treefrogs: diel timing of rainfall matters

The influence of abiotic and biotic factors on the temporal pattern of calling and breeding for many temperate anurans is well understood. However, few studies have documented patterns of reproduction in explosive-breeding tropical frogs or incorporated multiple environmental factors in their analyses, especially across multiple breeding seasons. We combine long-term natural history observations and automated data collection methods with boosted regression tree (BRT) analysis to determine the phenology and determinants of explosive breeding in the gliding treefrog, Agalychnis spurrelli. We monitored breeding for a total of 418 days across three breeding seasons and determined the relative importance of several environmental factors on the probability of calling and breeding activity. Our study population of A. spurrelli on Costa Rica's Osa Peninsula forms breeding aggregations up to 11 times per year during 1–2-day long explosive-breeding events, from late May to mid-September. Calling and breeding activity are strongly and positively related to accumulated rainfall during the previous 24 and 48–24 hours before, particularly rainfall during the afternoon and evening. Day-of-year, days since breeding occurred, and lunar phase also influence reproductive activity. This study provides the first description and analysis of the phenology and factors that predict explosive breeding in A. spurrelli and illustrates the value of using automated data collection paired with BRTs for analysis of complex ecological data.

opencc-zeroSep 2023View details →

dryad36/100