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Infaunal hydraulics generate porewater pressure signals
David S Wethey1, Sarah Ann Woodin
1Department of Biological Sciences, University of South Carolina, Columbia, South Carolina 29208, USA. wethey@biol.sc.edu
The Biological Bulletin
|November 2, 2005
Summary
Marine invertebrates generate detectable pressure waves through sediment during activities like burrowing and feeding. These species-specific signals could aid in communication for various ecological interactions.
Area of Science:
- Marine Biology
- Invertebrate Zoology
- Bioacoustics
Background:
- Infaunal activities such as burrowing and feeding often utilize hydraulic mechanisms.
- These activities are hypothesized to generate low-frequency pressure waves within sediments.
Purpose of the Study:
- To investigate the generation and detection of pressure waves produced by infauna.
- To identify characteristic pressure signals associated with specific species and behaviors.
Main Methods:
- Deployment of pressure sensors in intertidal sediments to record porewater pressure signals.
- Laboratory recordings of individual marine invertebrates (polychaetes and bivalves) to characterize their pressure signals.
- Field detection of pressure signals at distances up to 20 cm.
Main Results:
- Large-amplitude porewater pressure signals were detected in intertidal sediments.
- Characteristic, high-amplitude pressure signals were identified for arenicolid and nereidid polychaetes and tellinid bivalves.
- Specific activities like burrowing, feeding, and defecation were linked to distinct pressure signal waveforms.
Conclusions:
- Infaunal activities generate species- and activity-specific pressure waves detectable in sediments.
- These pressure waves may serve as a communication channel for ecological interactions, including predator-prey dynamics and mate detection.