Quantifying the shelter capacity of coral reefs using photogrammetric 3D modeling: From colonies to reefscapes

Structural complexity plays a key role in the functioning of coral reef ecosystems. Reef-building corals are major contributors to this complexity, providing shelter and food for numerous invertebrates and fish species. Both structural complexity and shelter capacity of reefscapes are determined by...

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Autores principales:	Isabel Urbina-Barreto, Frédéric Chiroleu, Romain Pinel, Louis Fréchon, Vincent Mahamadaly, Simon Elise, Michel Kulbicki, Jean-Pascal Quod, Eric Dutrieux, Rémi Garnier, J. Henrich Bruggemann, Lucie Penin, Mehdi Adjeroud
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Coral reefs Reef-building corals Photogrammetry 3D models Predictive models Shelter capacity Ecology QH540-549.5
Acceso en línea:	https://doaj.org/article/6d0a76733a844b2cac6b5225c0a06751
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spelling	oai:doaj.org-article:6d0a76733a844b2cac6b5225c0a067512021-12-01T04:36:55ZQuantifying the shelter capacity of coral reefs using photogrammetric 3D modeling: From colonies to reefscapes1470-160X10.1016/j.ecolind.2020.107151https://doaj.org/article/6d0a76733a844b2cac6b5225c0a067512021-02-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S1470160X20310906https://doaj.org/toc/1470-160XStructural complexity plays a key role in the functioning of coral reef ecosystems. Reef-building corals are major contributors to this complexity, providing shelter and food for numerous invertebrates and fish species. Both structural complexity and shelter capacity of reefscapes are determined by several components such as spurs and grooves, slope, caves and holes, vegetation and coral colonies. Quantifying the shelter capacity from coral colonies to reefscapes is a fundamental step to estimating ecosystem potential to support biodiversity. Here, we applied underwater photogrammetry to quantify shelter volumes provided by individual coral colonies. Overall, 120 3D models of coral colonies from branching, massive, columnar and tabular growth forms were studied. Three reefscapes were also 3D modeled. The study encompasses three Indo-Pacific Islands: Reunion, Europa and New Caledonia. At the colony level, measurements of diameter, planar area, surface and shelter volume were computed. At the reefscape, the diameter and planar area of each colony were extracted from orthomosaics and then used to estimate shelter capacity. Linear models had high accuracy for predicting shelter volume (a 3D metric) from 2D metrics: the diameter= 83.1%, R2= 0.95; the planar area= 87.5%, R2= 0.95 and the colony surface= 87.3%, R2= 0.96. The surface complexity and the shelter volume of the colonies allowed inferring the size of shelters provided by coral growth forms. Quantitative descriptors (i.e. relative percentage of shelter by growth form, the abundance of coral colonies, “Shannon-Shelter Index”) revealed reefscape-scale shelter differences.Our major finding is that planar area and diameter of coral colonies are satisfactory proxies for estimating shelter volume. These new proxies allow 2D metrics to quantify 3D shelter provision, which can support scientists and managers in conservation actions since such metrics are widely used in monitoring programs. Future investigations on the relationships between shelter provision and reef biodiversity will improve the understanding of these complex ecosystems.Isabel Urbina-BarretoFrédéric ChiroleuRomain PinelLouis FréchonVincent MahamadalySimon EliseMichel KulbickiJean-Pascal QuodEric DutrieuxRémi GarnierJ. Henrich BruggemannLucie PeninMehdi AdjeroudElsevierarticleCoral reefsReef-building coralsPhotogrammetry3D modelsPredictive modelsShelter capacityEcologyQH540-549.5ENEcological Indicators, Vol 121, Iss , Pp 107151- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Coral reefs Reef-building corals Photogrammetry 3D models Predictive models Shelter capacity Ecology QH540-549.5
spellingShingle	Coral reefs Reef-building corals Photogrammetry 3D models Predictive models Shelter capacity Ecology QH540-549.5 Isabel Urbina-Barreto Frédéric Chiroleu Romain Pinel Louis Fréchon Vincent Mahamadaly Simon Elise Michel Kulbicki Jean-Pascal Quod Eric Dutrieux Rémi Garnier J. Henrich Bruggemann Lucie Penin Mehdi Adjeroud Quantifying the shelter capacity of coral reefs using photogrammetric 3D modeling: From colonies to reefscapes
description	Structural complexity plays a key role in the functioning of coral reef ecosystems. Reef-building corals are major contributors to this complexity, providing shelter and food for numerous invertebrates and fish species. Both structural complexity and shelter capacity of reefscapes are determined by several components such as spurs and grooves, slope, caves and holes, vegetation and coral colonies. Quantifying the shelter capacity from coral colonies to reefscapes is a fundamental step to estimating ecosystem potential to support biodiversity. Here, we applied underwater photogrammetry to quantify shelter volumes provided by individual coral colonies. Overall, 120 3D models of coral colonies from branching, massive, columnar and tabular growth forms were studied. Three reefscapes were also 3D modeled. The study encompasses three Indo-Pacific Islands: Reunion, Europa and New Caledonia. At the colony level, measurements of diameter, planar area, surface and shelter volume were computed. At the reefscape, the diameter and planar area of each colony were extracted from orthomosaics and then used to estimate shelter capacity. Linear models had high accuracy for predicting shelter volume (a 3D metric) from 2D metrics: the diameter= 83.1%, R2= 0.95; the planar area= 87.5%, R2= 0.95 and the colony surface= 87.3%, R2= 0.96. The surface complexity and the shelter volume of the colonies allowed inferring the size of shelters provided by coral growth forms. Quantitative descriptors (i.e. relative percentage of shelter by growth form, the abundance of coral colonies, “Shannon-Shelter Index”) revealed reefscape-scale shelter differences.Our major finding is that planar area and diameter of coral colonies are satisfactory proxies for estimating shelter volume. These new proxies allow 2D metrics to quantify 3D shelter provision, which can support scientists and managers in conservation actions since such metrics are widely used in monitoring programs. Future investigations on the relationships between shelter provision and reef biodiversity will improve the understanding of these complex ecosystems.
format	article
author	Isabel Urbina-Barreto Frédéric Chiroleu Romain Pinel Louis Fréchon Vincent Mahamadaly Simon Elise Michel Kulbicki Jean-Pascal Quod Eric Dutrieux Rémi Garnier J. Henrich Bruggemann Lucie Penin Mehdi Adjeroud
author_facet	Isabel Urbina-Barreto Frédéric Chiroleu Romain Pinel Louis Fréchon Vincent Mahamadaly Simon Elise Michel Kulbicki Jean-Pascal Quod Eric Dutrieux Rémi Garnier J. Henrich Bruggemann Lucie Penin Mehdi Adjeroud
author_sort	Isabel Urbina-Barreto
title	Quantifying the shelter capacity of coral reefs using photogrammetric 3D modeling: From colonies to reefscapes
title_short	Quantifying the shelter capacity of coral reefs using photogrammetric 3D modeling: From colonies to reefscapes
title_full	Quantifying the shelter capacity of coral reefs using photogrammetric 3D modeling: From colonies to reefscapes
title_fullStr	Quantifying the shelter capacity of coral reefs using photogrammetric 3D modeling: From colonies to reefscapes
title_full_unstemmed	Quantifying the shelter capacity of coral reefs using photogrammetric 3D modeling: From colonies to reefscapes
title_sort	quantifying the shelter capacity of coral reefs using photogrammetric 3d modeling: from colonies to reefscapes
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/6d0a76733a844b2cac6b5225c0a06751
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Quantifying the shelter capacity of coral reefs using photogrammetric 3D modeling: From colonies to reefscapes

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