Dr Maevatiana N Ratsimbazafindranahaka
Chargé de recherche de classe normale (~Research faculty)
Joint Research Unit in Environmental Acoustics (UMRAE)
Cerema, Gustave Eiffel University
My research interest
As a field biologist and bioacoustician with a background in conservation biology, I am interested in the dynamics of animal communication and behavior, and how anthropogenic noise can affect them. In addition to conducting research, I am deeply passionate about science communication, aiming to bridge the gap between scientific knowledge and public understanding.
Favoring experimental studies in natural settings, I particularly use animal-borne multi-sensor tags (biologging) to examine animal behavior and understand their environments, integrating high-resolution data with signal-processing techniques. I’m always eager to take on the challenge of finding new approaches to exploit the high-resolution data collected from tags.
My expertise in biologging
I built my expertise in biologging during my PhD at the Paris-Saclay Institute of Neuroscience (CNRS/Paris-Saclay University, France) and the Department of Zoology and Animal Biodiversity (University of Antananarivo, Madagascar), focusing on humpback whale mother-calf interactions. Supervised by Dr. Isabelle Charrier, Prof. Olivier Adam, Prof. Aristide Andrianarimisa, and Dr. Chloé Huetz, I studied mother-calf behaviors and communication using animal-borne multi-sensor tags (CATS cam tags and Acousonde tags).
One significant achievement was the development of an automated method for detecting suckling behavior from accelerometer data. This method allowed detailed insights into suckling modalities, temporal patterns, laterality, and spatial and behavioral contexts. Moreover, I comprehensively investigated the swimming behavior of both calves and mothers, uncovering how their activities evolve with age and how mothers assist calves in their 3D environment. Additionally, I analyzed humpback whale vocalizations, associating specific calls with well-defined contexts and hypothesizing about their biological functions. I provided evidence supporting the use of begging calls by humpback whale calves.
Jeff Gibbs, CC BY-SA 3.0, via Wikimedia Commons
Shortly after my PhD, I was awarded the Alexander von Humboldt Fellowship, which enabled me to join Prof. Dr. Meg Crofoot’s team at the Max Planck Institute of Animal Behavior (MPIA-AB) in Konstanz, Germany, as a Postdoctoral Research Fellow, expanding my experience in biologging to terrestrial animals. At the MPI-AB, my research, which is now a continuing collaboration, focuses on vocal signaling and group behavior in Verreaux’s Sifaka (Propithecus verreauxi). Applying the techniques I used to study social interactions in whales, I aim to understand the information conveyed by Sifaka’s calls and analyze the pattern of vocalization usage within and across groups to assign functions to calls, as well as understand how they use information available in their environments.
Currently
In January 2026, I was appointed Chargé de recherche de classe normale (*Assistant Professor–level, research-only position in the French academic system) at the Joint Research Unit in Environmental Acoustics (UMRAE, Cerema, Université Gustave Eiffel). My research builds on my background in fundamental bioacoustics and behavioral ecology, while expanding to the use of bioacoustics as a tool to understand and mitigate the impacts of human activities and anthropogenic noise. In particular, I am interested in how renewable energy infrastructure affects wildlife and in developing bioacoustic approaches to mitigate these impacts. I adopt an integrative framework combining traditional behavioural methods, bioacoustics, ecoacoustics, and targeted biologging to study species’ movements, activities, vocalisations, and acoustic environments.
