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9 results for “Hyla versicolor”
Relyea, R. A., and N. Mills. 2001. Predator-induced stress makes the pesticide carbaryl more deadly to grey treefrog tadpoles (Hyla versicolor). PNAS 98:2491-2496.
Global declines in amphibians likely have multiple causes, including widespread pesticide use. Our knowledge of pesticide effects on amphibians is largely limited to short-term (4-d) toxicity tests conducted under highly artificial conditions to determine lethal concentrations (LC50). We found that if we used slightly longer exposure times (10–16 d), low concentrations of the pesticide carbaryl (3–4% of LC504-d) killed 10–60% of gray treefrog (Hyla versicolor) tadpoles. If predatory cues also were present, the pesticide became 2–4 times more lethal, killing 60–98% of tadpoles. Thus, under more realistic conditions of increased exposure times and predatory stress, current application rates for carbaryl can potentially devastate gray treefrog populations. Further, because predator-induced stress is ubiquitous in animals and carbaryl’s mode of action is common to many pesticides, these negative impacts may be widespread in nature.
Data from: Longer days, larger grays: Carryover effects of photoperiod and temperature in gray treefrogs, Hyla versicolor
<p>Environmental conditions like temperature and photoperiod can strongly shape organisms' growth and development. For many ectotherms with complex life cycles, global change will cause their offspring to experience warmer conditions and earlier-season photoperiods, two variables that can induce conflicting responses. We experimentally manipulated photoperiod and temperature during gray treefrog (<em>Hyla versicolor</em>) larval development to examine effects at metamorphosis and during short (10-day) and long (56-day) periods post-metamorphosis. Both early- and late-season photoperiods (April and August) decreased age and size at metamorphosis relative to the average-season (June) photoperiod, while warmer temperatures decreased age but increased size at metamorphosis. Warmer larval temperatures reduced short-term juvenile growth but had no long-term effect. Conversely, photoperiod had no short-term carryover effect, but juveniles from early- and late-season larval photoperiods had lower long-term growth rates than juveniles from the average-season photoperiod. Similar responses to early- and late-season photoperiods may be due to reduced total daylight compared to average-season photoperiods. However, juveniles from late-season photoperiods selected cooler temperatures than early-season juveniles, suggesting not all effects of photoperiod were due to total light exposure. Our results indicate that despite both temperature and photoperiod affecting metamorphosis, the long-term effects of photoperiod may be much stronger than those of temperature.</p>
Data from: Longer days, larger grays: Carryover effects of photoperiod and temperature in gray treefrogs, Hyla versicolor
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Independence of mate choice components (choosiness and preference functions) in Hyla versicolor
<p>Mate choice is an important cause of natural and sexual selection, driving the evolution of ornaments and promoting diversification and speciation. Mate choice decisions arise from the interaction of several components, and knowledge of whether they interact, and how, is crucial for understanding their contributions to selection. Here we focus on the relationship between preference functions (attractiveness ranking of prospective mates) and choosiness (effort invested in obtaining the preferred mate) and test the hypothesis that they are independent components of mate choice decisions. We examine individual variation in preference functions and choosiness for call duration in female <em>Hyla versicolor </em>treefrogs, and show that measures describing preference functions and choosiness are not correlated. We also found a suggestive but inconclusive pattern that both components are influenced by different factors (body measures and hormones). Independence of preference and choosiness suggests that the joint study of variation in both components is required to gain a complete understanding of how mate choice contributes to sexual selection and speciation.</p>
Independence of mate choice components (choosiness and preference functions) in Hyla versicolor
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Figure 2 in Effect of body size, age and timing of breeding on clutch and egg size of female Eastern Gray Treefrogs, Hyla versicolor
Figure 2. Determinants of clutch size (# eggs) in female Hyla versicolor. (A) Relationship between female body length and clutch size; (B) relationship between body condition and clutch size; (C) relationship between age and clutch size; (D) relationship between breeding season date and clutch size. Second and third clutches of repeat-breeding females are indicated as red symbols. Significant relationships are indicated by trendlines (see also Table 2).
Figure 1 in Effect of body size, age and timing of breeding on clutch and egg size of female Eastern Gray Treefrogs, Hyla versicolor
Figure 1. Lifespan, age and between-year growth of female Hyla versicolor. (A) Age distribution of females in the study population, and the relationship between age and body length. (B) Change in body length of the 7 females that were recaptured in consecutive years. Gray lines indicate averages.
Data from: A multivariate analysis of genetic variation in the advertisement call of the gray treefrog, Hyla versicolor
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Data from: Trade-offs and upper limits to signal performance during close-range vocal competition in gray treefrogs, Hyla versicolor
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