Remoras pick where they stick on blue whales

Brooke E. Flammang, Simone Marras, Erik J. Anderson, Oriol Lehmkuhl, Abhishek Mukherjee, David E. Cade, Michael Beckert, Jason H. Nadler, Guillaume Houzeaux, Mariano Vázquez, Haley E. Amplo, John Calambokidis, Ari S. Friedlaender, Jeremy A. Goldbogen

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Animal-borne video recordings from blue whales in the open ocean show that remoras preferentially adhere to specific regions on the surface of the whale. Using empirical and computational fluid dynamics analyses, we show that remora attachment was specific to regions of separating flow and wakes caused by surface features on the whale. Adhesion at these locations offers remoras drag reduction of up to 71–84% compared with the freestream. Remoras were observed to move freely along the surface of the whale using skimming and sliding behaviors. Skimming provided drag reduction as high as 50–72% at some locations for some remora sizes, but little to none was available in regions where few to no remoras were observed. Experimental work suggests that the Venturi effect may help remoras stay near the whale while skimming. Understanding the flow environment around a swimming blue whale will inform the placement of biosensor tags to increase attachment time for extended ecological monitoring.

Original languageEnglish (US)
Article numberjeb226654
JournalJournal of Experimental Biology
Volume223
Issue number20
DOIs
StatePublished - Oct 28 2020

All Science Journal Classification (ASJC) codes

  • Ecology, Evolution, Behavior and Systematics
  • Physiology
  • Aquatic Science
  • Animal Science and Zoology
  • Molecular Biology
  • Insect Science

Keywords

  • Adhesion
  • Biologging tag
  • Boundary layer
  • Drag
  • Echeneidae

Fingerprint

Dive into the research topics of 'Remoras pick where they stick on blue whales'. Together they form a unique fingerprint.

Cite this