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Buoyancy and hydrostatic balance in a West Indian Ocean coelacanth Latimeria chalumnae
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Buoyancy and hydrostatic balance in a West Indian Ocean coelacanth Latimeria chalumnae
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Journal Article
Buoyancy and hydrostatic balance in a West Indian Ocean coelacanth Latimeria chalumnae
2022
Overview
Background: Buoyancy and balance are important parameters for slow-moving, low-metabolic, aquatic organisms. The extant coelacanths have among the lowest metabolic rates of any living vertebrate and can aford little energy to keep station. Previous observations on living coelacanths support the hypothesis that the coelacanth is neutrally buoyant and in close-to-perfect hydrostatic balance. However, precise measurements of buoyancy and balance at diferent depths have never been made. Results: Here we show, using non-invasive imaging, that buoyancy of the coelacanth closely matches its depth distribution. We found that the lipid-flled fatty organ is well suited to support neutral buoyancy, and due to a closeto-perfect hydrostatic balance, simple maneuvers of fns can cause a considerable shift in torque around the pitch axis allowing the coelacanth to assume diferent body orientations with little physical efort. Conclusions: Our results demonstrate a close match between tissue composition, depth range and behavior, and our collection-based approach could be used to predict depth range of less well-studied coelacanth life stages as well as of deep sea fshes in general.
Publisher
BMC,BioMed Central,BioMed Central Ltd,Springer Nature B.V
Subject
