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Jouval F., Latreille A. C., Bureau S., Adjeroud Mehdi, Penin L. (2019). Multiscale variability in coral recruitment in the Mascarene Islands : from centimetric to geographical scale. PLoS One, 14 (3), e0214163 [17 p.]. ISSN 1932-6203

Fichier PDF disponiblehttp://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers19-04/010075518.pdf[ PDF Link ]

Lien direct chez l'éditeur doi:10.1371/journal.pone.0214163

Titre
Multiscale variability in coral recruitment in the Mascarene Islands : from centimetric to geographical scale
Année de publication2019
Type de documentArticle référencé dans le Web of Science WOS:000462000400040
AuteursJouval F., Latreille A. C., Bureau S., Adjeroud Mehdi, Penin L.
SourcePLoS One, 2019, 14 (3), p. e0214163 [17 p.]. p. e0214163 [17 p.] ISSN 1932-6203
RésuméCoral recruitment refers to the processes allowing maintenance and renewal of coral communities. Recruitment success is therefore indispensable for coral reef recovery after disturbances. Recruitment processes are governed by a variety of factors occurring at all spatial and temporal scales, from centimetres to hundreds of kilometres. In the present context of rising disturbances, it is thus of major importance to better understand the relative importance of different scales in this variation, and when possible, the factors associated with these scales. Multiscale spatio-temporal variability of scleractinian coral recruitment was investigated at two of the Mascarene Islands: Reunion and Rodrigues. Recruitment rates and taxonomic composition were examined during three consecutive six-month periods from regional to micro-local scales (i. e. from hundreds of kilometres to few centimetres) and between two protection levels (no-take zones and general protection zones). Very low recruitment rates were observed. Rodrigues displayed lower recruitment rates than Reunion. Recruit assemblage was dominated by Pocilloporidae (77.9%), followed by Acroporidae (9.9%) and Poritidae (5.2%). No protection effect was identified on coral recruitment, despite differences in recruitment rates among sites within islands. Recruits were patchily distributed within sites but no aggregative effect was detected, i. e. the preferentially colonised tiles were not spatially grouped. Recruits settled mainly on the sides of the tiles, especially at Rodrigues, which could be attributed to the high concentration of suspended matter. The variability of recruitment patterns at various spatial scales emphasises the importance of micro-to macro-local variations of the environment in the dynamics and maintenance of coral populations. High temporal variability was also detected, between seasons and years, which may be related to the early 2016 bleaching event at Rodrigues. The low recruitment rates and the absence of protection effect raise questions about the potential for recovery from disturbances of coral reefs in the Mascarene Islands.
Plan de classementEcologie, systèmes aquatiques [036]
Descr. géo.REUNION ; RODRIGUES ; OCEAN INDIEN SUD OUEST
LocalisationFonds IRD [F B010075518]
Identifiant IRDfdi:010075518
Lien permanenthttp://www.documentation.ird.fr/hor/fdi:010075518

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