Woodpeckers’ drumming, new research


This 2016 video from the USA says about itself:

World’s Loudest Woodpecker Drumming and Pecking! Northern Flickers use real man-made steel drums – metal chimney caps – that makes them intelligent “tool-users” and likely among the loudest woodpecker drummers in the world. But loud doesn’t begin to describe what the 15-minute long drumming and calling sessions sound like inside the house whose chimney top is used as a drum. Enjoy this short documentary and imagine what this sounds like at the break of dawn as a male Northern Flicker defends his territory, mate and nest box!

From the University of Zurich in Switzerland:

Woodpeckers’ drumming: Conserved meaning despite different structure over the years

October 2, 2020

Summary: How do animals produce and perceive biological information in sounds? To what extent does the acoustic structure and its associated meaning change during evolution? An international team has reconstructed the evolutionary history of an animal communication system, focusing on drumming signals of woodpeckers.

Animal acoustic signals are amazingly diverse. Researchers from the University of Zurich and the University of Saint-Etienne, together with French, American and Dutch collaborators, explored the function and diversification of animal acoustic signals and the mechanisms underlying the evolution of animal communication systems.

To this end, they used Shannon & Weaver’s ‘Mathematical Theory of Communication’ originally applied to telecommunications in 1949, which has transformed the scientific understanding of animal communication. This theory allows the amount of information in a signal to be quantified. The researchers were the first to use this framework within an evolutionary perspective to explore the biological information encoded in an animal signal.

How drumming structure evolves over time

In deciding which biological model to choose, the researchers selected the woodpeckers’ drumming as their ideal candidate. This bird family is known for rapidly striking their beaks on tree trunks to communicate. The team combined acoustic analyses of drumming from 92 species of woodpeckers, together with theoretic calculations, evolutionary reconstructions, investigations at the level of ecological communities as well as playback experiments in the field.

“We wanted to test whether drumming has evolved to enhance species-specific biological information, thereby promoting species recognition,” says lead author Maxime Garcia of the UZH Department of Evolutionary Biology and Environmental Studies.

Constant amount of information for 22 million years

Results demonstrate the emergence of new drumming types during woodpeckers evolution. Yet, despite these changes in drumming structure, the amount of biological information about species identity has remained relatively constant for 22 million years. Selection towards increased biological information thus does not seem to represent a major evolutionary driver in this animal communication system. How then can biological information be concretely maintained in nature? Analyses of existing communities around the globe show that ecological arrangements facilitate the efficiency of drumming signals: Communities are composed of only a few species, which distribute their drumming strategies to avoid acoustic overlap. “The responses to different drumming structures seen in our experimental approach show the ability of individuals to recognize their own species based on acoustic cues about species identity found in drumming signals,” says Garcia. This way, biological information about species identity can be maintained without necessarily inducing a strong evolutionary pressure on drumming signals.

The present study shows that random and unpredictable changes in the structure of communication signals over time can occur while maintaining the signals overall informative potential within and across species. This work leads the way to further investigate the evolution of meaning associated with communicating through multiple communication channels.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

This site uses Akismet to reduce spam. Learn how your comment data is processed.