Reef on the edge: resilience failure of marginal patch coral reefs in Eastern Arabian Sea under recurrent coral bleaching, coral diseases, and local stressors

De, Kalyan; Nanajкar, Mandar; Mote, Sambhaji; Ingole, Baban

doi:10.1007/s11356-022-22651-3

Cited by 2 publications

(1 citation statement)

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“…Although global warming has triggered unprecedented mass coral mortality across the ocean; the extent of bleaching at different reef region varies due to differences in temperature magnitude, coral species composition, past bleaching history, hydrodynamics, and several other local environmental factors (Anthony et al, 2008;Hughes et al, 2018Hughes et al, , 2003Swain et al, 2016). In many instances, some corals tolerate or recover better from bleaching than others in every geographical region including India (Kumaraguru, 2003;Manikandan et al, 2014;Pisapia and Burn, 2016;Thinesh et al, 2019a, De et al 2022, 2023. In India, studies are at a nascent state to identify the factors (symbiont types) responsible for differential bleaching patterns (for example Thinesh et al, 2019;Mote et al, 2021).…”

Section: Accurate Bleaching Survey Is Important To Capture Differenti...mentioning

confidence: 99%

History of recurrent short and long-term coral bleaching events in Indian coral reefs: a systematic review of contrasting bleaching patterns, lessons learned, and future directions

Thangadurai,

De,

Murugesan

et al. 2024

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Climate change has intensified coral bleaching events, leading to widespread coral mortality and threatening the coral reef survival worldwide. However, species susceptibility patterns to bleaching differ spatially and temporally, making it crucial to understand bleaching impact and species susceptibility patterns across latitudinal ranges, particularly from understudied locations. We critically reviewed 23 years of bleaching episodes on Indian coral reefs (four major reefs and other patch reefs) reported from 1998 to 2020 to understand the geographical footprint of bleaching patterns, species susceptibility differences, and their impact. We found that all four major Indian reef systems (Gulf of Kachchh, Gulf of Mannar, Lakshadweep, and the Andaman Islands) have experienced three major bleaching episodes (1998, 2010, and 2016) and multiple short-term bleaching events. Short-term bleaching events (DHWs> four weeks) created differences in species susceptibility, but the disparity among species diminished to long-term bleaching events (DHWs <4 weeks) in all reef sites. Acropora, Porites, Pocillopora, Montipora, and Turninaria in the Gulf of Mannar, Porites, and Favia in the Gulf of Kachchh, and Acropora in the Andaman and Lakshadweep were the most vulnerable genera during all the bleaching events. In terms of recovery, Porites and other massive forms recovered better than branching forms. Furthermore, species susceptibility pattern analysis (winners vs. losers) to 2016 long-term bleaching events found conflicting results from studies (one-time surveys) in the same area. This result indicates that a one-time survey (survey timing) influences results as bleaching events lengthen, necessitating repeated surveys to determine winners and losers. Although inconsistent data from different study sites makes it difficult to create predictive models, data collected over the past 23 years provides critical insight into coral community susceptibility patterns and bleaching impacts, underscoring the need for systematic, uniform surveys in the future. Keywords: Coral bleaching, Indian Ocean, Contrasting bleaching pattern, Gulf of Mannar, Andaman, Gulf of Kachchh.

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