Related Experiment Video
Updated: Jun 25, 2026
06:15
Using Enclosed Y-Mazes to Assess Chemosensory Behavior in Reptiles
Published on: April 7, 2021
Behavioral Responses Buffer Seasonal Variation More Strongly than Endocrine and Chemical Responses in Poison Frogs
Shirley Jennifer Serrano-Rojas1,2, Andrius Pašukonis3, Mabel Gonzalez1
1Department of Biology, Stanford University, Stanford, CA 94305, USA.
Integrative and Comparative Biology
|June 24, 2026
Summary
Tropical poison frogs use behavioral flexibility to cope with seasonal rainfall changes. Their physiological responses, however, remain largely unchanged, raising concerns for climate change impacts on these species.
Area of Science:
- Ecology
- Animal Behavior
- Physiology
Background:
- Tropical ecosystems experience distinct wet and dry seasons, influencing biological processes.
- Understanding how tropical species integrate behavioral and physiological adaptations to seasonality is crucial.
Purpose of the Study:
- To investigate how poison frog species with different reproductive strategies respond behaviorally and physiologically to seasonal environmental shifts.
- To compare seasonal and year-round breeding frog responses to dry and wet seasons.
Main Methods:
- Quantified spatial behavior, microhabitat use, hormone release rates (corticosterone, testosterone), and chemical defenses.
- Studied four poison frog species: two seasonal breeders (Allobates femoralis, Ameerega trivittata) and two year-round breeders (Ameerega macero, Ameerega shihuemoy).
Main Results:
- Seasonal breeders showed sex-specific shifts in space and microhabitat use between seasons, while year-round breeders maintained consistent patterns.
- Behavioral adjustments included males expanding space in the wet season and females in the dry season for seasonal breeders.
- Hormone levels and chemical defenses did not show consistent seasonal variation, indicating a decoupling from behavioral changes.
Conclusions:
- Behavioral plasticity plays a significant role in mediating tropical frog responses to seasonal environmental variation.
- The long-term efficacy of these behavioral coping strategies is uncertain under increasing climate change unpredictability.
- Poison frogs demonstrate complex strategies for navigating seasonal environmental changes, with behavior acting as a primary buffer.
Related Concept Videos
01:21Frequency-dependent Selection
When the fitness of a trait is influenced by how common it is (i.e., its frequency) relative to different traits within a population, this is referred to as frequency-dependent selection. Frequency-dependent selection may occur between species or within a single species. This type of selection can either be positive—with more common phenotypes having higher fitness—or negative, with rarer phenotypes conferring increased fitness.Positive Frequency-Dependent SelectionIn positive...
02:39Predator-Prey Interactions
Predators consume prey for energy. Predators that acquire prey and prey that avoid predation both increase their chances of survival and reproduction (i.e., fitness). Routine predator-prey interactions elicit mutual adaptations that improve predator offenses, such as claws, teeth, and speed, as well as prey defenses, including crypsis, aposematism, and mimicry. Thus, predator-prey interactions resemble an evolutionary arms race.Although predation is commonly associated with carnivory, for...
02:45Biological Clocks and Seasonal Responses
The circadian—or biological—clock is an intrinsic, timekeeping, molecular mechanism that allows plants to coordinate physiological activities over 24-hour cycles called circadian rhythms. Photoperiodism is a collective term for the biological responses of plants to variations in the relative lengths of dark and light periods. The period of light-exposure is called the photoperiod.
02:27Background and Environment Affect Phenotype
Although the genetic makeup of an organism plays a major role in determining the phenotype, there are also several environmental factors, such as temperature, oxygen availability, presence of mutagens, that can alter an organism’s phenotype.
An example of how genetic background affects phenotype can be seen in horses. The Extension gene in horses is responsible for their coat color. A wild-type gene (EE) produces black pigment in the coat, while a mutant gene (ee) produces red pigment. A...
An example of how genetic background affects phenotype can be seen in horses. The Extension gene in horses is responsible for their coat color. A wild-type gene (EE) produces black pigment in the coat, while a mutant gene (ee) produces red pigment. A...
01:18Positive and Negative Feedback Loops
Animal organs and organ systems constantly adjust to internal and external changes through a process called homeostasis ("steady state"). Examples of these changes include regulation of the level of glucose or calcium in the blood or internal responses to external temperatures. Homeostasis requires maintaining an internal dynamic equilibrium:
01:06Fixed Action Patterns
A fixed action pattern (FAP) is a specific, hard-wired sequence of behaviors that occurs in response to an external stimulus, called a sign stimulus. The behavior is “fixed” because it is essentially unchangeable—proceeding similarly across individuals of a species every time it occurs.