Underwater photogrammetry reveals new links between coral reefscape traits and fishes that ensure key functions

Urbina-Barreto, I.; Elise, S.; /Guilhaumon, François; Bruggemann, J. H.; Pinel, R.; /Kulbicki, Michel; /Vigliola, Laurent; /Mou-Tham, Gérard; Mahamadaly, V.; Facon, M.; Bureau, S.; /Peignon, Christophe; Dutrieux, E.; Garnier, R.; Penin, L.; /Adjeroud, Mehdi

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dc.creator	Urbina-Barreto, I.
dc.creator	Elise, S.
dc.creator	/Guilhaumon, François
dc.creator	Bruggemann, J. H.
dc.creator	Pinel, R.
dc.creator	/Kulbicki, Michel
dc.creator	/Vigliola, Laurent
dc.creator	/Mou-Tham, Gérard
dc.creator	Mahamadaly, V.
dc.creator	Facon, M.
dc.creator	Bureau, S.
dc.creator	/Peignon, Christophe
dc.creator	Dutrieux, E.
dc.creator	Garnier, R.
dc.creator	Penin, L.
dc.creator	/Adjeroud, Mehdi
dc.date	2022
dc.date.accessioned	2022-04-27T17:37:52Z
dc.date.available	2022-04-27T17:37:52Z
dc.identifier	https://www.documentation.ird.fr/hor/fdi:010084389
dc.identifier	oai:ird.fr:fdi:010084389
dc.identifier	Urbina-Barreto I., Elise S., Guilhaumon François, Bruggemann J. H., Pinel R., Kulbicki Michel, Vigliola Laurent, Mou-Tham Gérard, Mahamadaly V., Facon M., Bureau S., Peignon Christophe, Dutrieux E., Garnier R., Penin L., Adjeroud Mehdi. Underwater photogrammetry reveals new links between coral reefscape traits and fishes that ensure key functions. 2022, 13 (2), p. e3934 [18 p.]
dc.identifier.uri	http://biblioteca-repositorio.clacso.edu.ar/handle/CLACSO/169137
dc.description	Maintaining key functions of coral reefs is vital for the persistence of these ecosystems as well as for securing the goods and services that they provide in the Anthropocene. Underwater photogrammetry by Structure from Motion (SfM) allows the quantification of novel habitat descriptors that may be particularly relevant in assessing key reefscape traits, that is, physical and ecological characteristics of coral reef habitats. Here, we combined this new technology with fish surveys to explore how reefscape traits shape the functional structure of reef fish assemblages around three environmentally contrasted islands of the Indo-Pacific (Europa Island, Reunion Island, and New Caledonia). At 24 sites, habitat descriptors were computed from digital elevation models (DEM) and orthomosaics, while reef fish assemblages were assessed by visual census and video footage. Four habitat descriptors were marginally correlated and presented low variance inflation factor (VIF) values, thus being the most complementary descriptors: surface complexity, total shelter capacity, Shannon Shelter Index, and total coral cover. Linear mixed models (LMM) were used to explore the relationships between these habitat descriptors and four key fish functional entities: prey, planktivores, grazers, and predators. For each model, the variance explained (i.e., marginal R-2) was significantly higher when considering multiple predictors, including the novel three-dimensional descriptors (i.e., total shelter capacity and Shannon Shelter Index). The habitat descriptors quantified from underwater photogrammetry outputs (i.e., DEM and orthomosaics) provide easily available data to assess key reefscape traits and predict fish assemblage structure in coral reef ecosystems. This trait-based functional approach allows consistent assessment of the links between these descriptors from local to regional scales. Considering the global coral reef crisis and the increasing availability of world-reef photogrammetric surveys, this new technology should be key to bringing solutions to 21st-century conservation issues.
dc.language	EN
dc.subject	Anthropocene
dc.subject	coral reefs
dc.subject	digital elevation model
dc.subject	fish assemblages
dc.subject	habitat descriptors
dc.subject	key ecosystem functions
dc.subject	orthomosaic
dc.subject	photogrammetry
dc.subject	shelter capacity
dc.subject	structural complexity
dc.title	Underwater photogrammetry reveals new links between coral reefscape traits and fishes that ensure key functions
dc.type	text
dc.coverage	PACIFIQUE
dc.coverage	REUNION
dc.coverage	NOUVELLE CALEDONIE
dc.coverage	EUROPA