Biological scaling in green algae: the role of cell size and geometry

Abstract The Metabolic Scaling Theory (MST), hypothesizes limitations of resource-transport networks in organisms and predicts their optimization into fractal-like structures. As a result, the relationship between population growth rate and body size should follow a cross-species universal quarter-p...

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Autores principales:	Helena Bestová, Jules Segrestin, Klaus von Schwartzenberg, Pavel Škaloud, Thomas Lenormand, Cyrille Violle
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/928cef8ecc7d4a01bd3775e355aacf7b
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spelling	oai:doaj.org-article:928cef8ecc7d4a01bd3775e355aacf7b2021-12-02T15:33:01ZBiological scaling in green algae: the role of cell size and geometry10.1038/s41598-021-93816-22045-2322https://doaj.org/article/928cef8ecc7d4a01bd3775e355aacf7b2021-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-93816-2https://doaj.org/toc/2045-2322Abstract The Metabolic Scaling Theory (MST), hypothesizes limitations of resource-transport networks in organisms and predicts their optimization into fractal-like structures. As a result, the relationship between population growth rate and body size should follow a cross-species universal quarter-power scaling. However, the universality of metabolic scaling has been challenged, particularly across transitions from bacteria to protists to multicellulars. The population growth rate of unicellulars should be constrained by external diffusion, ruling nutrient uptake, and internal diffusion, operating nutrient distribution. Both constraints intensify with increasing size possibly leading to shifting in the scaling exponent. We focused on unicellular algae Micrasterias. Large size and fractal-like morphology make this species a transitional group between unicellular and multicellular organisms in the evolution of allometry. We tested MST predictions using measurements of growth rate, size, and morphology-related traits. We showed that growth scaling of Micrasterias follows MST predictions, reflecting constraints by internal diffusion transport. Cell fractality and density decrease led to a proportional increase in surface area with body mass relaxing external constraints. Complex allometric optimization enables to maintain quarter-power scaling of population growth rate even with a large unicellular plan. Overall, our findings support fractality as a key factor in the evolution of biological scaling.Helena BestováJules SegrestinKlaus von SchwartzenbergPavel ŠkaloudThomas LenormandCyrille ViolleNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-9 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Helena Bestová Jules Segrestin Klaus von Schwartzenberg Pavel Škaloud Thomas Lenormand Cyrille Violle Biological scaling in green algae: the role of cell size and geometry
description	Abstract The Metabolic Scaling Theory (MST), hypothesizes limitations of resource-transport networks in organisms and predicts their optimization into fractal-like structures. As a result, the relationship between population growth rate and body size should follow a cross-species universal quarter-power scaling. However, the universality of metabolic scaling has been challenged, particularly across transitions from bacteria to protists to multicellulars. The population growth rate of unicellulars should be constrained by external diffusion, ruling nutrient uptake, and internal diffusion, operating nutrient distribution. Both constraints intensify with increasing size possibly leading to shifting in the scaling exponent. We focused on unicellular algae Micrasterias. Large size and fractal-like morphology make this species a transitional group between unicellular and multicellular organisms in the evolution of allometry. We tested MST predictions using measurements of growth rate, size, and morphology-related traits. We showed that growth scaling of Micrasterias follows MST predictions, reflecting constraints by internal diffusion transport. Cell fractality and density decrease led to a proportional increase in surface area with body mass relaxing external constraints. Complex allometric optimization enables to maintain quarter-power scaling of population growth rate even with a large unicellular plan. Overall, our findings support fractality as a key factor in the evolution of biological scaling.
format	article
author	Helena Bestová Jules Segrestin Klaus von Schwartzenberg Pavel Škaloud Thomas Lenormand Cyrille Violle
author_facet	Helena Bestová Jules Segrestin Klaus von Schwartzenberg Pavel Škaloud Thomas Lenormand Cyrille Violle
author_sort	Helena Bestová
title	Biological scaling in green algae: the role of cell size and geometry
title_short	Biological scaling in green algae: the role of cell size and geometry
title_full	Biological scaling in green algae: the role of cell size and geometry
title_fullStr	Biological scaling in green algae: the role of cell size and geometry
title_full_unstemmed	Biological scaling in green algae: the role of cell size and geometry
title_sort	biological scaling in green algae: the role of cell size and geometry
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/928cef8ecc7d4a01bd3775e355aacf7b
work_keys_str_mv	AT helenabestova biologicalscalingingreenalgaetheroleofcellsizeandgeometry AT julessegrestin biologicalscalingingreenalgaetheroleofcellsizeandgeometry AT klausvonschwartzenberg biologicalscalingingreenalgaetheroleofcellsizeandgeometry AT pavelskaloud biologicalscalingingreenalgaetheroleofcellsizeandgeometry AT thomaslenormand biologicalscalingingreenalgaetheroleofcellsizeandgeometry AT cyrilleviolle biologicalscalingingreenalgaetheroleofcellsizeandgeometry
_version_	1718387154886852608

Biological scaling in green algae: the role of cell size and geometry

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