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Coral Reefs

, Volume 37, Issue 4, pp 1245–1257 | Cite as

Coral reefs respond to repeated ENSO events with increasing resistance but reduced recovery capacities in the Lakshadweep archipelago

  • S. Yadav
  • T. Alcoverro
  • R. Arthur
Report

Abstract

The resilience of reefs to repeated, increasingly frequent thermal disturbance is a dynamic balance between resistance and recovery pathways. The Lakshadweep archipelago in the central Indian Ocean has experienced three El Niño Southern Oscillation (ENSO) events in 1998, 2010 and 2016. Using a multi-decadal monitoring of 6 shallow reefs, we estimated reef resistance and coral recovery after each of these bleaching events. Even as the severity of each ENSO event increased over time, coral mortality decreased from 87% post-1998 to 44% after 2010 and 31% after 2016. In contrast, benthic recovery after 2010 was more protracted than after 1998, with a fourfold decrease in recovery rates between the two time periods. This has resulted in a 40% decline in absolute coral cover in the last 2 decades from 51.6% in 1998 to 11% in 2017. We examined the demographic and compositional mechanisms underlying these two recovery trajectories by monitoring coral recruitment, juvenile, and young adult compositions for 5 yr after 1998 and 2010. While coral juvenile densities were comparable after each of these disturbances, densities of fast-growing Acroporids had reduced from > 1 m−2 post-1998 to 0.09 m−2 post-2010. This was reflected in the composition of coral communities in 2003 and 2015, which differed in its dominant coral taxa, with a dramatic decline in Acropora and an increase in the cover of Porites by 2015. While the dominance of resistant taxa like Porites signals a shift to a system adapting to recurrent thermal anomalies, the reduction in fast-growing, habitat-forming corals like Acropora is driving a major decline in recovery rates with time. Given the frequency of current warming events, the increased reef resistance over the last 2 decades is likely not sufficient to also ensure gains in coral cover in Lakshadweep’s reefs.

Keywords

Bleaching Scleractinian corals Life-history strategy Community composition Reef recovery Indian Ocean 

Notes

Acknowledgements

This study was supported by grants from The Rufford Foundation, the Pew Marine Fellowships (0025864) and The Spanish National Research Council (Memorandum of understanding between CEAB-IMEDEA-NCF). We thank the Department of Science and Technology and the Department of Tourism (SPORTS), Lakshadweep, for permits and logistical support and Rucha Karkarey, Mayuresh Gangal, Pooja Rathod, Vardhan Patankar, Aaron Lobo, Amod Zambre, Aditi Pophale and MK Ibrahim for their invaluable help in the field during the course of this study. We would also like to thank Abinand Reddy, Jordi Pagès and Susanna Pinedo for help and advice with analytical approaches and three anonymous reviewers for valuable comments on this manuscript.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Supplementary material

338_2018_1735_MOESM1_ESM.docx (5.8 mb)
Supplementary material 1 (DOCX 5966 kb)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Nature Conservation FoundationMysoreIndia
  2. 2.Marine Biology Graduate ProgramUniversity of Hawai‘i at MānoaHonoluluUSA
  3. 3.Centre d’Estudis Avançats de Blanes (CEAB-CSIC)BlanesSpain

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