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  • 1
    Online Resource
    Online Resource
    Lag Effects in the Impacts of Mass Coral Bleaching on Coral Reef Fish, Fisheries, and Ecosystems
    Wiley ; 2007
    In:  Conservation Biology Vol. 21, No. 5 ( 2007-10), p. 1291-1300
    Details
    In: Conservation Biology, Wiley, Vol. 21, No. 5 ( 2007-10), p. 1291-1300
    Abstract: Resumen:  Episodios recientes de blanqueado de corales han llevado a la pérdida extensiva de arrecifes de coral y han incrementado la preocupación sobre la efectividad de los esfuerzos actuales de conservación y manejo. El evento de blanqueado de 1998 fue más severo en el occidente del Océano Índico, donde el coral declinó hasta en 90% en algunas localidades. Utilizando datos independientes de pesquerías, evaluamos los impactos a largo plazo de este evento sobre especies importantes para las pesquerías en las Seychelles, sobre la estructura de tallas en el ensamble de peces y sobre la efectividad de dos áreas marinas protegidas (AMPs) en la protección de las comunidades de peces. La biomasa de peces capturados por arriba de la talla retenida en las trampas de peces cambió poco entre 1994 y 2005, lo que indica que no hay efectos actuales sobre la producción de las pesquerías. La biomasa fue mayor en las AMPs, lo que indica que fueron eficientes en la protección de los peces. Sin embargo, la estructura de tallas de las comunidades de peces, descritas con el análisis del espectro de tallas, cambió tanto en las áreas con pesca como en las AMPs, con una declinación en peces pequeños ( 〈 30 cm) y un incremento en peces más grandes ( 〉 45 cm). Pensamos que esto representa una respuesta a largo plazo porque se están perdiendo peces debido a la mortalidad natural y no están siendo reemplazados por juveniles. Se espera que este efecto sea mayor en términos de la productividad de las pesquerías y, debido a que se observan patrones congruentes para herbívoros, sugiere que las AMPs no ofrecen resiliencia a largo plazo contra los eventos de blanqueado de arrecifes de coral. La abundancia de coralívoros y planktívoros declinó marcadamente, particularmente en AMPs, y esta declinación se asoció con un patrón de declinación similar en sus arrecifes preferidos. Sugerimos que las perturbaciones debido al clima, como el blanqueado de corales, estén en primer plano en la planificación de la conservación de arrecifes de coral.
    Type of Medium: Online Resource
    ISSN: 0888-8892 , 1523-1739
    URL: Issue
    URL: Article
    DOI: 10.1111/cbi.2007.21.issue-5
    DOI: 10.1111/j.1523-1739.2007.00754.x
    Language: English
    Publisher: Wiley
    Publication Date: 2007
    detail.hit.zdb_id: 2020041-9
    SSG: 12
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  • 2
    Online Resource
    Online Resource
    The commercially important shoemaker spinefoot, Siganus sutor , connects coral reefs to neighbouring seagrass meadows
    Wiley ; 2020
    In:  Journal of Fish Biology Vol. 96, No. 4 ( 2020-04), p. 1034-1044
    Details
    In: Journal of Fish Biology, Wiley, Vol. 96, No. 4 ( 2020-04), p. 1034-1044
    Abstract: Spatial management of fish populations can potentially be optimized by determining the area of influence of a particular species. We performed an acoustic tagging study implemented on Denis Island in the Seychelles to assess the area of influence of the heavily targeted shoemaker spinefoot, Siganus sutor . We investigated whether this species acts as a mobile link between coral patches and seagrass meadows, and whether their movements differed between day and night. The study incorporated an array of 22 acoustic stations deployed within dense coral patches, seagrass meadows and mixed habitats of both seagrass and coral. Fifteen S. sutor carrying internal acoustic tags were monitored from November 2016 until May 2017. Detection patterns revealed them to be diurnal herbivores, with only rare nocturnal movements. Home‐range estimates showed that individuals differed in their spatial range extents and habitats used, covering ~15% of the total shallow subtidal coastline of the island. However, they displayed very small daily movements ( 〈 200 m), concentrated mainly around sites within mixed coral and seagrass habitats. An optimal number of detections was recorded when the coral to seagrass area ratio was approximately 1.6:1. This ratio was confirmed through statistical prediction modelling. Identification of such links of commercially important species between networked habitats may help authorities consider incorporating seagrass meadows of the Seychelles into management discussions, which are currently lacking.
    Type of Medium: Online Resource
    ISSN: 0022-1112 , 1095-8649
    URL: Issue
    URL: Article
    DOI: 10.1111/jfb.v96.4
    DOI: 10.1111/jfb.14297
    Language: English
    Publisher: Wiley
    Publication Date: 2020
    detail.hit.zdb_id: 410564-3
    detail.hit.zdb_id: 1471958-7
    SSG: 21,3
    SSG: 12
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  • 3
    Online Resource
    Online Resource
    Dynamic fragility of oceanic coral reef ecosystems
    Proceedings of the National Academy of Sciences ; 2006
    In:  Proceedings of the National Academy of Sciences Vol. 103, No. 22 ( 2006-05-30), p. 8425-8429
    Details
    In: Proceedings of the National Academy of Sciences, Proceedings of the National Academy of Sciences, Vol. 103, No. 22 ( 2006-05-30), p. 8425-8429
    Abstract: As one of the most diverse and productive ecosystems known, and one of the first ecosystems to exhibit major climate-warming impacts (coral bleaching), coral reefs have drawn much scientific attention to what may prove to be their Achilles heel, the thermal sensitivity of reef-building corals. Here we show that climate change-driven loss of live coral, and ultimately structural complexity, in the Seychelles results in local extinctions, substantial reductions in species richness, reduced taxonomic distinctness, and a loss of species within key functional groups of reef fish. The importance of deteriorating physical structure to these patterns demonstrates the longer-term impacts of bleaching on reefs and raises questions over the potential for recovery. We suggest that isolated reef systems may be more susceptible to climate change, despite escaping many of the stressors impacting continental reefs.
    Type of Medium: Online Resource
    ISSN: 0027-8424 , 1091-6490
    URL: Article
    DOI: 10.1073/pnas.0600693103
    RVK:
    TA 1000
    RVK:
    WA 15000
    Language: English
    Publisher: Proceedings of the National Academy of Sciences
    Publication Date: 2006
    detail.hit.zdb_id: 209104-5
    detail.hit.zdb_id: 1461794-8
    SSG: 11
    SSG: 12
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