Participatory reporting of the 2016 bleaching event in the Western Indian Ocean

Gudka, Mishal; Obura, David; Mbugua, James; Ahamada, Said; Kloiber, Ulli; Holter, Tammy

doi:10.1007/s00338-019-01851-3

Cited by 34 publications

(40 citation statements)

References 26 publications

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“…Relevant coral communities -including scleractinians and antipatharians – were first documented in the area on shallow (>30 m depth) and mesophotic reefs (at depths between 35 m and 55 m) in the 1970s (Pichon 1978). More recent studies documented severe reef degradation due to fisheries, pollution, and heavy sedimentation derived from nearby river deposition (Harris et al 2010; Todinanahary et al 2016, 2018), as well as coral bleaching episodes (Gudka et al 2018). Antipatharian samples were collected in November-December 2018 at shallow (20 m depth, 23°20.978’ S, 43°36.885’ E – Site 1) and mesophotic (40 m depth, 23°21.345’ S, 43°36.348’ E – Site 2) reefs (Figure 1a).…”

Section: Methodsmentioning

confidence: 99%

Investigating densities of Symbiodiniaceae in two species of Antipatharians (black corals) from Madagascar

Gress

Eeckhaut

Godefroid³

et al. 2021

Preprint

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Here, we report the first methodological approach to investigate the presence and estimate the density of Symbiodiniaceae cells in corals of the order Antipatharia subclass Hexacorallia, known as black corals. Antipatharians are understudied ecosystem engineers of shallow (<30 m depth), mesophotic (30-150 m) and deep-sea (>200 m) reefs. They provide habitat to a vast number of marine fauna, enhancing and supporting coral reefs biodiversity globally. Nonetheless, little biological and ecological information exists on antipatharians, including the extent at which global change disturbances are threatening these corals. The assumption that they were exempted from threats related to climate change was challenged by findings of high density of dinoflagellates within three antipatharian colonies. Further methodical studies were necessary to investigate the regularity of these findings. An integrated design combining microscopy and molecular techniques was used to investigate the presence and estimate density of Symbiodiniaceae cells within two antipatharians species -Cupressopathes abies and Stichopathes maldivensis -from shallow and mesophotic reefs of SW Madagascar. Symbiodiniaceae-like cells were found within the two species from both shallow and mesophotic reefs, although the overall cell density was very low (0-4 cell mm-3). These findings suggest that high abundance of Symbiodiniaceae is not characteristic of antipatharians, which has relevant implications considering disruptions associated to climate change affecting other corals. However, the high densities of dinoflagellates found in antipatharian colonies exposed to higher light irradiance in other studies should be further examined.

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Section: Methodsmentioning

confidence: 99%

Investigating densities of Symbiodiniaceae in two species of Antipatharians (black corals) from Madagascar

Gress

Eeckhaut

Godefroid³

et al. 2021

Preprint

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“…Major coral bleaching events have also been observed elsewhere following major El Niño, especially over the western Indian Ocean (e.g. Perry and Morgan 2017;Gudka et al 2018;). With unabated global warming, MHWs and related coral bleaching events will become more frequent in the future (Lough et al 2018).…”

Section: Extreme Eventsmentioning

confidence: 99%

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2020

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THIS EDITION of Exchanges focuses on the recent decadal review of the Indian Ocean Observing System (IndOOS) and its outcomes. IndOOS was established in 2006 under the visionary leadership of Dr. Gary Meyers (1941-2016), the founding chair of the CLIVAR/IOC-GOOS Indian Ocean Regional Panel (IORP), to address the need for a sustained observing system that consists of a variety of observing platforms to support weather and climate research and prediction. Key founding components of the IndOOS were a tropical basin-wide mooring array-the Research moored Array for African Asian Australian Monsoon Analysis and Prediction (RAMA)-and a network of repeat expendable bathythermograph (XBT) lines. Broad international participation and support, facilitated and coordinated by the regional GOOS alliance (IO-GOOS) and the IndOOS Resources Forum (IRF), have played a crucial role in maximizing the limited resources available to implement the IndOOS. IndOOS has now passed the 10-year milestone. A full decadal review report has recently been released as the outcome of a three-year review effort led by the IORP co-chairs, Lisa Beal, Jérôme Vialard, and Mathew Koll Roxy, with a writing team comprising more than 60 scientific experts. As highlighted in their article in this issue, the decadal review has generated 136 actionable recommendations and led to a roadmap of an enhanced observing system for the next decade (2020-2030). This second phase, IndOOS-2 (Figure 1, cover page), is designed to meet the current and future societal needs for seamless prediction of Indian Ocean climate and ecosystems across a wide range of timescales, from days to seasons to years to decades to centuries and beyond. Achieving goals of IndOOS-2 will depend critically on capacity building, resource management, regional partnerships, and information sharing. It is becoming more important than ever that the scientific community actively engages with stakeholders, policy makers, and civil society in the Indian Ocean rim countries to build and sustain IndOOS-2, and to address the grand challenges identified by the World Climate Research Program and the societal outcomes envisioned under the UN Decade of Ocean Science for Sustainable Development. The main body of this edition is a condensed version of the full IndOOS-2 report, reorganized under five main science themes: natural and anthropogenic warming of the Indian Ocean, monsoon and regional airsea interaction, ocean processes and modelling, physical and biogeochemical processes and interactions, and climate information and prediction across timescales. These themed articles, written by many lead authors of the full report, are meant to provide collective reviews that address the progress made and the gaps that still exist in understanding the complex dynamical and biogeochemical processes in the Indian Ocean, and in improving prediction skills for weather, climate, and ecosystems. The OceanObs'19 (16-21 September 2019, Hawaii) called for new cooperative models for Observing System Governance to better align...

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“…Other regional forecast models of coral stress due to heat, extreme cold winter anomalies, and coral disease have been implemented, such as in Australia (Maynard et al, 2011). These models, combined with volunteer-based ground-truth monitoring networks (e.g., Gudka and Obura, 2017), help generate awareness of the threat of coral bleaching, and build interest and capacity in management responses to mitigate them and promote resilience and recovery to the events (Marshall and Schuttenberg, 2006).…”

Section: Coral Bleachingmentioning

confidence: 99%