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Allometric scaling of a superposition eye optimizes sensitivity and acuity in large and small hawkmoths

Animals vary widely in body size within and across species. This has consequences for the function of organs and body parts in both large and small individuals. How these scale, in relation to body size, reveals evolutionary investment strategies, often resulting in trade-offs between functions. Eye...

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Autores principales: Stöckl, Anna, Grittner, Rebecca, Taylor, Gavin, Rau, Christoph, Bodey, Andrew J., Kelber, Almut, Baird, Emily
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9326294/
https://www.ncbi.nlm.nih.gov/pubmed/35892218
http://dx.doi.org/10.1098/rspb.2022.0758
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author Stöckl, Anna
Grittner, Rebecca
Taylor, Gavin
Rau, Christoph
Bodey, Andrew J.
Kelber, Almut
Baird, Emily
author_facet Stöckl, Anna
Grittner, Rebecca
Taylor, Gavin
Rau, Christoph
Bodey, Andrew J.
Kelber, Almut
Baird, Emily
author_sort Stöckl, Anna
collection PubMed
description Animals vary widely in body size within and across species. This has consequences for the function of organs and body parts in both large and small individuals. How these scale, in relation to body size, reveals evolutionary investment strategies, often resulting in trade-offs between functions. Eyes exemplify these trade-offs, as they are limited by their absolute size in two key performance features: sensitivity and spatial acuity. Due to their size polymorphism, insect compound eyes are ideal models for studying the allometric scaling of eye performance. Previous work on apposition compound eyes revealed that allometric scaling led to poorer spatial resolution and visual sensitivity in small individuals, across a range of insect species. Here, we used X-ray microtomography to investigate allometric scaling in superposition compound eyes—the second most common eye type in insects—for the first time. Our results reveal a novel strategy to cope with the trade-off between sensitivity and spatial acuity, as we show that the eyes of the hummingbird hawkmoth retain an optimal balance between these performance measures across all body sizes.
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spelling pubmed-93262942022-07-29 Allometric scaling of a superposition eye optimizes sensitivity and acuity in large and small hawkmoths Stöckl, Anna Grittner, Rebecca Taylor, Gavin Rau, Christoph Bodey, Andrew J. Kelber, Almut Baird, Emily Proc Biol Sci Evolution Animals vary widely in body size within and across species. This has consequences for the function of organs and body parts in both large and small individuals. How these scale, in relation to body size, reveals evolutionary investment strategies, often resulting in trade-offs between functions. Eyes exemplify these trade-offs, as they are limited by their absolute size in two key performance features: sensitivity and spatial acuity. Due to their size polymorphism, insect compound eyes are ideal models for studying the allometric scaling of eye performance. Previous work on apposition compound eyes revealed that allometric scaling led to poorer spatial resolution and visual sensitivity in small individuals, across a range of insect species. Here, we used X-ray microtomography to investigate allometric scaling in superposition compound eyes—the second most common eye type in insects—for the first time. Our results reveal a novel strategy to cope with the trade-off between sensitivity and spatial acuity, as we show that the eyes of the hummingbird hawkmoth retain an optimal balance between these performance measures across all body sizes. The Royal Society 2022-07-27 2022-07-27 /pmc/articles/PMC9326294/ /pubmed/35892218 http://dx.doi.org/10.1098/rspb.2022.0758 Text en © 2022 The Authors. https://creativecommons.org/licenses/by/4.0/Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, provided the original author and source are credited.
spellingShingle Evolution
Stöckl, Anna
Grittner, Rebecca
Taylor, Gavin
Rau, Christoph
Bodey, Andrew J.
Kelber, Almut
Baird, Emily
Allometric scaling of a superposition eye optimizes sensitivity and acuity in large and small hawkmoths
title Allometric scaling of a superposition eye optimizes sensitivity and acuity in large and small hawkmoths
title_full Allometric scaling of a superposition eye optimizes sensitivity and acuity in large and small hawkmoths
title_fullStr Allometric scaling of a superposition eye optimizes sensitivity and acuity in large and small hawkmoths
title_full_unstemmed Allometric scaling of a superposition eye optimizes sensitivity and acuity in large and small hawkmoths
title_short Allometric scaling of a superposition eye optimizes sensitivity and acuity in large and small hawkmoths
title_sort allometric scaling of a superposition eye optimizes sensitivity and acuity in large and small hawkmoths
topic Evolution
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9326294/
https://www.ncbi.nlm.nih.gov/pubmed/35892218
http://dx.doi.org/10.1098/rspb.2022.0758
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