"Choice" and destiny: the substrate composition and mechanical stability of settlement structures can mediate coral recruit fate in post-bleached reefs

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• 作者：Shreya Yadav ; Pooja Rathod ; Teresa Alcoverro ; Rohan Arthur
• 关键词：Reef recovery ; Post ; settlement survival ; Substrate cues ; Structural stability
• 刊名：Coral Reefs
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：35
• 期：1
• 页码：211-222
• 全文大小：801 KB
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• 作者单位：Shreya Yadav (1)
  Pooja Rathod (2)
  Teresa Alcoverro (1) (3)
  Rohan Arthur (1) (3)
  
  1. Nature Conservation Foundation, 3076/5, IV Cross, Gokulam Park, Mysore, 570002, India
  2. National Center for Biological Sciences, GKVK Campus, Bellary Road, Bengaluru, Karnataka, 560065, India
  3. Department of Marine Ecology, Centre d’Estudis Avançats de Blanes (CEAB), Consejo Superior de Investigaciones Científicas (CSIC), Accés a la Cala S. Francesc 14, 17300, Blanes, Girona, Spain
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Oceanography
  Geology
  Sedimentology
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-0975

文摘

Increasingly frequent and intense ocean warming events seriously test the buffer and recovery capacities of tropical coral reefs. Post-disturbance, available settlement structures on a reef (often dead coral skeletons) vary considerably in their mechanical stability and substrate composition, critically influencing coral recruit settlement choice and fate. In the wake of a coral mass mortality in the Lakshadweep archipelago, we examine (1) the relative availability of recruit settlement structures (from stable to unstable: reef platform, dead massive coral, consolidated rubble, dead corymbose coral, dead tabular coral, and unconsolidated rubble) in 12 recovering reefs across three atolls in the archipelago, (2) the substrate composition [crustose coralline algae (CCA), mixed turf, macroalgae] of these structural forms, and (3) whether the choice and fate of young coral are mediated by the substrate and stability of different structural forms. For this, we measured the abundance and distribution of recruit (<1 cm), juvenile (1–5 cm), and young adult (5–10) corals of 24 common coral genera. Four years after the mass mortality, reefs differed considerably in composition of settlement structures. The structures themselves varied significantly in substrate cover with dead tables largely covered in CCA [60 ± 6.05 % (SE)] and dead corymbose coral dominated by mixed turf (61.83 ± 3.8 %). The youngest visible recruits (<1 cm) clearly preferred CCA-rich structures such as dead massives and tables. However, older size classes were rarely found on unstable structures (strongly “avoiding” tables, Ivlev’s electivity index, E = −0.5). Our results indicate that while substrate cover might mediate coral choice, the mechanical stability of settlement structures is critical in determining post-settlement coral survival. The composition and availability of settlement structures on a reef may serve as a characteristic signature of its recovery potential, aiding in assessments of reef resilience.