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Start Over Author "Mehdi Adjeroud" Journal scientific reports
4 results on '"Mehdi Adjeroud"'

1. Coral reef structural complexity loss exposes coastlines to waves

Author

Jérémy Carlot, Michalis Vousdoukas, Alessio Rovere, Theofanis Karambas, Hunter S. Lenihan, Mohsen Kayal, Mehdi Adjeroud, Gonzalo Pérez-Rosales, Laetitia Hedouin, and Valeriano Parravicini

Subjects
Medicine, Science
Abstract

Abstract Coral reefs offer natural coastal protection by attenuating incoming waves. Here we combine unique coral disturbance-recovery observations with hydrodynamic models to quantify how structural complexity dissipates incoming wave energy. We find that if the structural complexity of healthy coral reefs conditions is halved, extreme wave run-up heights that occur once in a 100-years will become 50 times more frequent, threatening reef-backed coastal communities with increased waves, erosion, and flooding.

Published
2023
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2. Citizen Science, a promising tool for detecting and monitoring outbreaks of the crown-of-thorns starfish Acanthaster spp

Author

Laurent Wantiez, Olivier Chateau, Mehdi Adjeroud, Sylvie Fiat, Antoine De Ramon N'Yeurt, Gérard Mou-Tham, Jayven Ham, Rocky Kaku, Pascal Dumas, Sompert Gereva, Amaury Durbano, Christophe Peignon, Ecologie marine tropicale des océans Pacifique et Indien (ENTROPIE [Nouvelle-Calédonie]), Ifremer - Nouvelle-Calédonie, Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut de Recherche pour le Développement (IRD [Nouvelle-Calédonie])-Université de la Nouvelle-Calédonie (UNC), Université de la Nouvelle-Calédonie (UNC), Écosystémique des communautés récifales et de leurs usages dans le Pacifique insulaire (CoReUS), Fisheries Department of Vanuatu, Observatoire océanologique de Banyuls (OOB), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Adaptation et diversité en milieu marin (AD2M), Station biologique de Roscoff (SBR), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherche pour le Développement (IRD [Nouvelle-Calédonie])-Ifremer - Nouvelle-Calédonie, and Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de la Nouvelle-Calédonie (UNC)

Subjects
0106 biological sciences, [SDV]Life Sciences [q-bio], [SDE.MCG]Environmental Sciences/Global Changes, Population Dynamics, lcsh:Medicine, 010603 evolutionary biology, 01 natural sciences, Article, Starfish, New Caledonia, Citizen science, Animals, 14. Life underwater, lcsh:Science, ComputingMilieux_MISCELLANEOUS, High peak, Government, Multidisciplinary, Invasive species, biology, Coral Reefs, Conservation biology, business.industry, 010604 marine biology & hydrobiology, lcsh:R, Environmental resource management, Acanthaster, Outbreak, Tropical ecology, biology.organism_classification, [SDE.ES]Environmental Sciences/Environmental and Society, Crown-of-thorns starfish, Geography, lcsh:Q, [SDE.BE]Environmental Sciences/Biodiversity and Ecology, business
Abstract

Monitoring potentially devastating coral-eating crown-of-thorns starfish (COTS) populations at scales relevant to management is a challenging task. Here, we investigated a citizen science approach to detect COTS outbreaks and prioritize management responses. Between 2014 and 2018, 38 000 COTS were recorded through 641 online observation reports submitted across New Caledonia, Vanuatu and Fiji by private stakeholders (51%), NGOs (22%), business operator (11%), research/government agencies (16%). COTS were observed in multiple areas, including in remote/inhabited reefs where they had never been reported. A three-level classification was developed to discriminate risk areas and propose operational guidelines to streamline management actions. About two-thirds of reports had low abundances (−1). Combining professional and non-professional observers increased the detection range (+27%) and the number of COTS detections (+129%). Citizen reports were eventually followed by removal campaigns organized within diverse institutional frameworks. While citizen monitoring has intrinsic limitations, we advocate that it constitutes a complementary and promising approach to support the ongoing management efforts in all countries affected by COTS.

Published
2020
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3. Diversity, structure and demography of coral assemblages on underwater lava flows of different ages at Reunion Island and implications for ecological succession hypotheses

Author

Florian, Jouval, Lionel, Bigot, Sophie, Bureau, Jean-Pascal, Quod, Lucie, Penin, and Mehdi, Adjeroud

Subjects
Islands, Conservation of Natural Resources, Population dynamics, Population Dynamics, Animals, Biodiversity, Volcanic Eruptions, Community ecology, Anthozoa, Indian Ocean, Models, Biological, Ecosystem, Article
Abstract

Understanding colonization of new habitats and ecological successions is key to ecosystem conservation. However, studies on primary successions are scarce for reef-building corals, due to the rarity of newly formed substratum and the long-term monitoring efforts required for their long life cycle and slow growth rate. We analysed data describing the diversity, structure and demography of coral assemblages on lava flows of different ages and coral reefs at Reunion Island, to evaluate the strength and mechanisms of succession, and its agreement to the theoretical models. No significant differences were observed between the two habitats for most structure and demographic descriptors. In contrast, species richness and composition differentiated coral reefs from lava flows, but were not related to the age of the lava flow. We observed a strong dominance of Pocillopora colonies, which underline the opportunistic nature of this taxa, with life-history traits advantageous to dominance on primary and secondary successional stages. Although some results argue in favor of the tolerance model of succession, the sequences of primary successions as theorized in other ecosystems were difficult to observe, which is likely due to the high frequency and intensity of disturbances at Reunion, that likely distort or set back the expected successional sequences.

Published
2020

4. Coral reef structural complexity loss exposes coastlines to waves

Author

Jérémy Carlot, Michalis Vousdoukas, Alessio Rovere, Theofanis Karambas, Hunter S. Lenihan, Mohsen Kayal, Mehdi Adjeroud, Gonzalo Pérez-Rosales, Laetitia Hedouin, Valeriano Parravicini, Centre de recherches insulaires et observatoire de l'environnement (CRIOBE), Université de Perpignan Via Domitia (UPVD)-École Pratique des Hautes Études (EPHE), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Excellence CORAIL (LabEX CORAIL), Institut de Recherche pour le Développement (IRD)-Université des Antilles et de la Guyane (UAG)-École des hautes études en sciences sociales (EHESS)-École Pratique des Hautes Études (EPHE), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de La Réunion (UR)-Université de la Polynésie Française (UPF)-Université de la Nouvelle-Calédonie (UNC)-Institut d'écologie et environnement-Université des Antilles (UA), Centre de Synthèse et d’Analyse sur la Biodiversité (CESAB), Fondation pour la recherche sur la Biodiversité (FRB), University of the Aegean, Center for Marine Environmental Sciences [Bremen] (MARUM), Universität Bremen, Aristotle University of Thessaloniki, Bren School of Environmental Science and Management, University of California [Santa Barbara] (UC Santa Barbara), University of California (UC)-University of California (UC), Ecologie marine tropicale dans les Océans Pacifique et Indien (ENTROPIE [Réunion]), and Institut de Recherche pour le Développement (IRD)-Université de La Réunion (UR)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Settore BIO/07 - Ecologia, extreme events, climate change, Multidisciplinary, coastal protection, structural complexity, Settore GEO/04 - Geografia Fisica e Geomorfologia, [SDE.BE]Environmental Sciences/Biodiversity and Ecology, coral reefs, [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography
Abstract

Coral reefs offer natural coastal protection by attenuating incoming waves. Here we combine unique coral disturbance-recovery observations with hydrodynamic models to quantify how structural complexity dissipates incoming wave energy. We find that if the structural complexity of healthy coral reefs conditions is halved, extreme wave run-up heights that occur once in a 100-years will become 50 times more frequent, threatening reef-backed coastal communities with increased waves, erosion, and flooding.

Full Text
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