Upper limits to body size imposed by respiratory–structural trade-offs in Antarctic pycnogonids
Across metazoa, surfaces for respiratory gas exchange are diverse, and the size of those surfaces scales with body size. In vertebrates with lungs and gills, surface area and thickness of the respiratory barrier set upper limits to rates of metabolism. Conversely, some organisms and life stages rely...
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ftpubmed:oai:pubmedcentral.nih.gov:5666104 2023-05-15T13:52:40+02:00 Upper limits to body size imposed by respiratory–structural trade-offs in Antarctic pycnogonids Lane, Steven J. Shishido, Caitlin M. Moran, Amy L. Tobalske, Bret W. Arango, Claudia P. Woods, H. Arthur 2017-10-25 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5666104/ http://www.ncbi.nlm.nih.gov/pubmed/29070725 https://doi.org/10.1098/rspb.2017.1779 en eng The Royal Society http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5666104/ http://www.ncbi.nlm.nih.gov/pubmed/29070725 http://dx.doi.org/10.1098/rspb.2017.1779 © 2017 The Author(s) http://royalsocietypublishing.org/licence Published by the Royal Society. All rights reserved. Ecology Text 2017 ftpubmed https://doi.org/10.1098/rspb.2017.1779 2018-10-28T00:07:31Z Across metazoa, surfaces for respiratory gas exchange are diverse, and the size of those surfaces scales with body size. In vertebrates with lungs and gills, surface area and thickness of the respiratory barrier set upper limits to rates of metabolism. Conversely, some organisms and life stages rely on cutaneous respiration, where the respiratory surface (skin, cuticle, eggshell) serves two primary functions: gas exchange and structural support. The surface must be thin and porous enough to transport gases but strong enough to withstand external forces. Here, we measured the scaling of surface area and cuticle thickness in Antarctic pycnogonids, a group that relies on cutaneous respiration. Surface area and cuticle thickness scaled isometrically, which may reflect the dual roles of cuticle in gas exchange and structural support. Unlike in vertebrates, the combined scaling of these variables did not match the scaling of metabolism. To resolve this mismatch, larger pycnogonids maintain steeper oxygen gradients and higher effective diffusion coefficients of oxygen in the cuticle. Interactions among scaling components lead to hard upper limits in body size, which pycnogonids could evade only with some other evolutionary innovation in how they exchange gases. Text Antarc* Antarctic PubMed Central (PMC) Antarctic Proceedings of the Royal Society B: Biological Sciences 284 1865 20171779 |
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topic |
Ecology |
spellingShingle |
Ecology Lane, Steven J. Shishido, Caitlin M. Moran, Amy L. Tobalske, Bret W. Arango, Claudia P. Woods, H. Arthur Upper limits to body size imposed by respiratory–structural trade-offs in Antarctic pycnogonids |
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Ecology |
description |
Across metazoa, surfaces for respiratory gas exchange are diverse, and the size of those surfaces scales with body size. In vertebrates with lungs and gills, surface area and thickness of the respiratory barrier set upper limits to rates of metabolism. Conversely, some organisms and life stages rely on cutaneous respiration, where the respiratory surface (skin, cuticle, eggshell) serves two primary functions: gas exchange and structural support. The surface must be thin and porous enough to transport gases but strong enough to withstand external forces. Here, we measured the scaling of surface area and cuticle thickness in Antarctic pycnogonids, a group that relies on cutaneous respiration. Surface area and cuticle thickness scaled isometrically, which may reflect the dual roles of cuticle in gas exchange and structural support. Unlike in vertebrates, the combined scaling of these variables did not match the scaling of metabolism. To resolve this mismatch, larger pycnogonids maintain steeper oxygen gradients and higher effective diffusion coefficients of oxygen in the cuticle. Interactions among scaling components lead to hard upper limits in body size, which pycnogonids could evade only with some other evolutionary innovation in how they exchange gases. |
format |
Text |
author |
Lane, Steven J. Shishido, Caitlin M. Moran, Amy L. Tobalske, Bret W. Arango, Claudia P. Woods, H. Arthur |
author_facet |
Lane, Steven J. Shishido, Caitlin M. Moran, Amy L. Tobalske, Bret W. Arango, Claudia P. Woods, H. Arthur |
author_sort |
Lane, Steven J. |
title |
Upper limits to body size imposed by respiratory–structural trade-offs in Antarctic pycnogonids |
title_short |
Upper limits to body size imposed by respiratory–structural trade-offs in Antarctic pycnogonids |
title_full |
Upper limits to body size imposed by respiratory–structural trade-offs in Antarctic pycnogonids |
title_fullStr |
Upper limits to body size imposed by respiratory–structural trade-offs in Antarctic pycnogonids |
title_full_unstemmed |
Upper limits to body size imposed by respiratory–structural trade-offs in Antarctic pycnogonids |
title_sort |
upper limits to body size imposed by respiratory–structural trade-offs in antarctic pycnogonids |
publisher |
The Royal Society |
publishDate |
2017 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5666104/ http://www.ncbi.nlm.nih.gov/pubmed/29070725 https://doi.org/10.1098/rspb.2017.1779 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5666104/ http://www.ncbi.nlm.nih.gov/pubmed/29070725 http://dx.doi.org/10.1098/rspb.2017.1779 |
op_rights |
© 2017 The Author(s) http://royalsocietypublishing.org/licence Published by the Royal Society. All rights reserved. |
op_doi |
https://doi.org/10.1098/rspb.2017.1779 |
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Proceedings of the Royal Society B: Biological Sciences |
container_volume |
284 |
container_issue |
1865 |
container_start_page |
20171779 |
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1766257095726858240 |