New Publication: Navigating Savanna Constraints — Acoustic Ecology of the Bubbling Kassina
- Jul 2
- 2 min read
Check Paulo Fonseca's latest study published in the Journal of Comparative Physiology A, exploring how environmental extremes shape animal communication.
The paper, "Crepuscular vocal partitioning and thermal limits on calling behavior in the Bubbling Kassina (Kassina senegalensis) in a sub-equatorial savanna," looks at the acoustic strategies used by these widespread anurans to combat the harsh atmospheric conditions of Mozambique.
Key Discoveries
Bimodal Strategy: To overcome extreme temperature, wind, and desiccation risks in open savannas, K. senegalensis utilizes a distinct bimodal calling pattern, peaking sharply at dawn and dusk. This crepuscular shift should also allow them to optimize signal transmission when atmospheric conditions are most stable.
Thermal Window: The study identified a calling window between 23°C and 27°C. Once temperatures breach 30°C , calling activity drops, mapping out a upper thermal limits for their vocal behavior.
Influence of Moonlight: Beyond temperature and photoperiod, lunar cycles seems to influence the timing and intensity of calling.
🔬 Why It Matters
Echoing the neuroethological framework championed by Peter Narins, this research shows that communication signals cannot be understood apart from environmental constraints. By integrating temporal shifts, thermal limits, and moonlight cues, the species displays remarkable behavioral plasticity. However, because K. senegalensis is a widespread habitat generalist, these findings open an exciting new question: is this multifaceted strategy a fixed species trait, or a locally adapted response? Future multi-site studies will be essential to find out.
Read the full study: Access the publication on Journal of Comparative Physiology A
Reference: Álvarez, G. A., Márquez, R., Mathevon, N., Kyle, K., Jordaan, P. R., & Fonseca, P. (2026). Crepuscular vocal partitioning and thermal limits on calling behavior in the Bubbling Kassina (Kassina senegalensis) in a sub-equatorial savanna. Journal of comparative physiology A. https://doi.org/10.1007/s00359-026-01825-1
