Skip to Main content Skip to Navigation
Journal articles

Resilience of octocoral forests to catastrophic Storms

Abstract : After centuries of human-mediated disturbances, Caribbean reef communities are vastly different from those described in the 1950s. Many are functionally dominated by macroalgae, but this community state represents only one of several possibilities into which present-day coral reefs can transition. octocorals have always been abundant on caribbean reefs, but increases in their abundance over the last few decades suggest that arborescent octocorals have the potential to expand their populations on reefs that hitherto had been dominated by scleractinians. Here we show that octocoral-dominated communities at three sites on the fringing reefs of St. John, US Virgin Islands, were resilient to the effects of two Category 5 hurricanes in 2017. We describe the dynamics of octocoral communities over five years at three sites on shallow reefs (~9-m depth), and test for the effects of Hurricanes Irma and Maria. The hurricanes depressed the densities of juvenile and adult octocoral colonies as much as 47%. However, there were only weak effects on species richness and the relative abundances of the octocoral species. the hurricanes did not alter patterns of spatial variability in octocoral community structure that existed among sites prior to the storms. The density of octocoral recruits (individuals ≤ 5 cm high) was reduced in the year following the hurricanes, mainly due to a decline in abundance of recruits <0.5 cm, but returned to pre-storm densities in 2019. Persistently high octocoral recruitment provides a mechanism supporting ecological resilience of these communities. Continuing environmental degradation is a threat to all tropical marine communities, but the reefs of St. John illustrate how "octocoral forests" can persist as the structurally dominant community on caribbean reefs.
Document type :
Journal articles
Complete list of metadata

Cited literature [71 references]  Display  Hide  Download

https://hal.sorbonne-universite.fr/hal-02927659
Contributor : Lorenzo Bramanti <>
Submitted on : Tuesday, September 1, 2020 - 8:00:58 PM
Last modification on : Tuesday, December 8, 2020 - 3:33:43 AM

File

Lasker et al. - 2020 - Resilie...
Publisher files allowed on an open archive

Identifiers

Citation

H Lasker, Á Martínez-Quintana, L Bramanti, P.J. Edmunds. Resilience of octocoral forests to catastrophic Storms. Scientific Reports, Nature Publishing Group, 2020, ⟨10.1038/s41598-020-61238-1⟩. ⟨hal-02927659⟩

Share

Metrics

Record views

54

Files downloads

61