Architecture of the sperm whale forehead facilitates ramming combat
Herman Melville’s novel Moby Dick was inspired by historical instances in which large sperm whales (Physeter macrocephalus L.) sank 19th century whaling ships by ramming them with their foreheads. The immense forehead of sperm whales is possibly the largest, and one of the strangest, anatomical stru...
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ftpubmed:oai:pubmedcentral.nih.gov:4824896 2023-05-15T17:59:28+02:00 Architecture of the sperm whale forehead facilitates ramming combat Panagiotopoulou, Olga Spyridis, Panagiotis Mehari Abraha, Hyab Carrier, David R. Pataky, Todd C. 2016-04-05 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4824896/ http://www.ncbi.nlm.nih.gov/pubmed/27069822 https://doi.org/10.7717/peerj.1895 en eng PeerJ Inc. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4824896/ http://www.ncbi.nlm.nih.gov/pubmed/27069822 http://dx.doi.org/10.7717/peerj.1895 ©2016 Panagiotopoulou et al. http://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, reproduction and adaptation in any medium and for any purpose provided that it is properly attributed. For attribution, the original author(s), title, publication source (PeerJ) and either DOI or URL of the article must be cited. CC-BY Animal Behavior Text 2016 ftpubmed https://doi.org/10.7717/peerj.1895 2016-04-17T00:11:51Z Herman Melville’s novel Moby Dick was inspired by historical instances in which large sperm whales (Physeter macrocephalus L.) sank 19th century whaling ships by ramming them with their foreheads. The immense forehead of sperm whales is possibly the largest, and one of the strangest, anatomical structures in the animal kingdom. It contains two large oil-filled compartments, known as the “spermaceti organ” and “junk,” that constitute up to one-quarter of body mass and extend one-third of the total length of the whale. Recognized as playing an important role in echolocation, previous studies have also attributed the complex structural configuration of the spermaceti organ and junk to acoustic sexual selection, acoustic prey debilitation, buoyancy control, and aggressive ramming. Of these additional suggested functions, ramming remains the most controversial, and the potential mechanical roles of the structural components of the spermaceti organ and junk in ramming remain untested. Here we explore the aggressive ramming hypothesis using a novel combination of structural engineering principles and probabilistic simulation to determine if the unique structure of the junk significantly reduces stress in the skull during quasi-static impact. Our analyses indicate that the connective tissue partitions in the junk reduce von Mises stresses across the skull and that the load-redistribution functionality of the former is insensitive to moderate variation in tissue material parameters, the thickness of the partitions, and variations in the location and angle of the applied load. Absence of the connective tissue partitions increases skull stresses, particularly in the rostral aspect of the upper jaw, further hinting of the important role the architecture of the junk may play in ramming events. Our study also found that impact loads on the spermaceti organ generate lower skull stresses than an impact on the junk. Nevertheless, whilst an impact on the spermaceti organ would reduce skull stresses, it would also cause high ... Text Physeter macrocephalus Sperm whale PubMed Central (PMC) PeerJ 4 e1895 |
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PubMed Central (PMC) |
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English |
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Animal Behavior |
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Animal Behavior Panagiotopoulou, Olga Spyridis, Panagiotis Mehari Abraha, Hyab Carrier, David R. Pataky, Todd C. Architecture of the sperm whale forehead facilitates ramming combat |
topic_facet |
Animal Behavior |
description |
Herman Melville’s novel Moby Dick was inspired by historical instances in which large sperm whales (Physeter macrocephalus L.) sank 19th century whaling ships by ramming them with their foreheads. The immense forehead of sperm whales is possibly the largest, and one of the strangest, anatomical structures in the animal kingdom. It contains two large oil-filled compartments, known as the “spermaceti organ” and “junk,” that constitute up to one-quarter of body mass and extend one-third of the total length of the whale. Recognized as playing an important role in echolocation, previous studies have also attributed the complex structural configuration of the spermaceti organ and junk to acoustic sexual selection, acoustic prey debilitation, buoyancy control, and aggressive ramming. Of these additional suggested functions, ramming remains the most controversial, and the potential mechanical roles of the structural components of the spermaceti organ and junk in ramming remain untested. Here we explore the aggressive ramming hypothesis using a novel combination of structural engineering principles and probabilistic simulation to determine if the unique structure of the junk significantly reduces stress in the skull during quasi-static impact. Our analyses indicate that the connective tissue partitions in the junk reduce von Mises stresses across the skull and that the load-redistribution functionality of the former is insensitive to moderate variation in tissue material parameters, the thickness of the partitions, and variations in the location and angle of the applied load. Absence of the connective tissue partitions increases skull stresses, particularly in the rostral aspect of the upper jaw, further hinting of the important role the architecture of the junk may play in ramming events. Our study also found that impact loads on the spermaceti organ generate lower skull stresses than an impact on the junk. Nevertheless, whilst an impact on the spermaceti organ would reduce skull stresses, it would also cause high ... |
format |
Text |
author |
Panagiotopoulou, Olga Spyridis, Panagiotis Mehari Abraha, Hyab Carrier, David R. Pataky, Todd C. |
author_facet |
Panagiotopoulou, Olga Spyridis, Panagiotis Mehari Abraha, Hyab Carrier, David R. Pataky, Todd C. |
author_sort |
Panagiotopoulou, Olga |
title |
Architecture of the sperm whale forehead facilitates ramming combat |
title_short |
Architecture of the sperm whale forehead facilitates ramming combat |
title_full |
Architecture of the sperm whale forehead facilitates ramming combat |
title_fullStr |
Architecture of the sperm whale forehead facilitates ramming combat |
title_full_unstemmed |
Architecture of the sperm whale forehead facilitates ramming combat |
title_sort |
architecture of the sperm whale forehead facilitates ramming combat |
publisher |
PeerJ Inc. |
publishDate |
2016 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4824896/ http://www.ncbi.nlm.nih.gov/pubmed/27069822 https://doi.org/10.7717/peerj.1895 |
genre |
Physeter macrocephalus Sperm whale |
genre_facet |
Physeter macrocephalus Sperm whale |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4824896/ http://www.ncbi.nlm.nih.gov/pubmed/27069822 http://dx.doi.org/10.7717/peerj.1895 |
op_rights |
©2016 Panagiotopoulou et al. http://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, reproduction and adaptation in any medium and for any purpose provided that it is properly attributed. For attribution, the original author(s), title, publication source (PeerJ) and either DOI or URL of the article must be cited. |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.7717/peerj.1895 |
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e1895 |
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