Morphology and Mechanics of the Fin Whale Esophagus: The Key to Fast Processing of Large Food Volumes by Rorquals

Author:

Gil K N12ORCID,Vogl A W3,Shadwick R E12

Affiliation:

1. D , Vancouver, BC V6T 1Z4 , Canada

2. epartment of Zoology, University of British Columbia , Vancouver, BC V6T 1Z4 , Canada

3. Life Sciences Institute and Department of Cellular and Physiological Sciences, University of British Columbia , Vancouver, BC V6T 1Z3 , Canada

Abstract

Synopsis Lunge feeding rorqual whales feed by engulfing a volume of prey laden water that can be as large as their own body. Multiple feeding lunges occur during a single foraging dive and the time between each lunge can be as short as 30 s (Goldbogen et al. 2013). During this short inter-lunge time, water is filtered out through baleen to concentrate prey in the oral cavity, and then the prey is swallowed prior to initiating the next lunge. Prey density in the ocean varies greatly, and despite the potential of swallowing a massive volume of concentrated prey as a slurry, the esophagus of rorqual whales has been anecdotally described as unexpectedly narrow with a limited capacity to expand. How rorquals swallow large quantities of food down a narrow esophagus during a limited inter-lunge time remains unknown. Here, we show that the small diameter muscular esophagus in the fin whale is optimized to transport a slurry of food to the stomach. A thick wall of striated muscle occurs at the pharyngeal end of the esophagus which, together with the muscular wall of the pharynx, may generate a pressure head for transporting the food down the esophagus to the stomach as a continuous stream rather than separating the food into individual boluses swallowed separately. This simple model is consistent with estimates of prey density and stomach capacity. Rorquals may be the only animals that capture a volume of food too large to swallow as a single intact bolus without oral processing, so the adaptations of the esophagus are imperative for transporting these large volumes of concentrated food to the stomach during a time-limited dive involving multiple lunges.

Funder

Natural Sciences and Engineering Research Council of Canada

Publisher

Oxford University Press (OUP)

Reference40 articles.

1. Gulping behaviour in rorqual whales: underwater observations and functional interpretation;Arnold;Mem Queensl Mus,2005

2. Noise generated by the jaw actions of feeding fin whales;Brodie,1993

3. Ecosystem impact of the decline of large whales in the North Pacific;Croll;Whales, Whaling and Ocean Ecosystems,2006

4. From wind to whales: trophic links in a coastal upwelling system;Croll;Mar Ecol Prog Ser,2005

5. Anatomical mechanism for protecting the airway in the largest animals on earth;Gil;Curr Biol,2022

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