@article{fdi:010080613,
  title = {{Q}uantifying the shelter capacity of coral reefs using photogrammetric 3{D} modeling : from colonies to reefscapes},
  author = {{U}rbina-{B}arreto, {I}. and {C}hiroleu, {F}. and {P}inel, {R}. and {F}rechon, {L}. and {M}ahamadaly, {V}. and {E}lise, {S}. and {K}ulbicki, {M}ichel and {Q}uod, {J}. {P}. and {D}utrieux, {E}. and {G}arnier, {R}. and {B}ruggemann, {J}. {H}. and {P}enin, {L}. and {A}djeroud, {M}ehdi},
  editor = {},
  language = {{ENG}},
  abstract = {{S}tructural complexity plays a key role in the functioning of coral reef ecosystems. {R}eef-building corals are major contributors to this complexity, providing shelter and food for numerous invertebrates and fish species. {B}oth 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. {Q}uantifying the shelter capacity from coral colonies to reefscapes is a fundamental step to estimating ecosystem potential to support biodiversity. {H}ere, we applied underwater photogrammetry to quantify shelter volumes provided by individual coral colonies. {O}verall, 120 3{D} models of coral colonies from branching, massive, columnar and tabular growth forms were studied. {T}hree reefscapes were also 3{D} modeled. {T}he study encompasses three {I}ndo-{P}acific {I}slands: {R}eunion, {E}uropa and {N}ew {C}aledonia. {A}t the colony level, measurements of diameter, planar area, surface and shelter volume were computed. {A}t the reefscape, the diameter and planar area of each colony were extracted from orthomosaics and then used to estimate shelter capacity. {L}inear models had high accuracy for predicting shelter volume (a 3{D} metric) from 2{D} metrics: the diameter= 83.1%, {R}-2 = 0.95; the planar area= 87.5%, {R}-2 = 0.95 and the colony surface= 87.3%, {R}-2 = 0.96. {T}he surface complexity and the shelter volume of the colonies allowed inferring the size of shelters provided by coral growth forms. {Q}uantitative descriptors (i.e. relative percentage of shelter by growth form, the abundance of coral colonies, "{S}hannon-{S}helter {I}ndex") revealed reefscape-scale shelter differences. {O}ur major finding is that planar area and diameter of coral colonies are satisfactory proxies for estimating shelter volume. {T}hese new proxies allow 2{D} metrics to quantify 3{D} shelter provision, which can support scientists and managers in conservation actions since such metrics are widely used in monitoring programs. {F}uture investigations on the relationships between shelter provision and reef biodiversity will improve the understanding of these complex ecosystems.},
  keywords = {{C}oral reefs ; {R}eef-building corals ; {P}hotogrammetry ; 3{D} models ; {P}redictive models ; {S}helter capacity ; {S}tructural complexity ; {C}oral growth forms ; {PACIFIQUE} ; {OCEAN} {INDIEN} ; {NOUVELLE} {CALEDONIE} ; {REUNION} ; {EUROPA}},
  booktitle = {},
  journal = {{E}cological {I}ndicators},
  volume = {121},
  numero = {},
  pages = {107151 [12 p.]},
  ISSN = {1470-160{X}},
  year = {2021},
  DOI = {10.1016/j.ecolind.2020.107151},
  URL = {https://www.documentation.ird.fr/hor/fdi:010080613},
}