Welcome to AquaDocs!

AquaDocs is the joint open access repository of the UNESCO/IOC InternationaI Oceanographic Data and Information Exchange (IODE) and the International Association of Aquatic and Marine Science Libraries and Information Centers (IAMSLIC) with support from the FAO Aquatic Sciences and Fisheries Abstracts. It is a thematic repository covering the natural marine, coastal, estuarine /brackish and fresh water environments and includes all aspects of the science, technology, management and conservation of these environments, their organisms and resources, and the economic, sociological and legal aspects. [see About]

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AFRICA [5873]
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  • Gorgona Marina: contribución al conocimiento de una isla única

    Barrios Suárez, Lina María; López Victoria, Mateo; Instituto de Investigaciones Marinas y Costeras "José Benito Vives de Andréis" (Instituto de Investigaciones Marinas y Costeras "José Benito Vives de Andréis", 2001)
    En el inhóspito, Agreste y poco conocido Pacífico colombiano, se destaca un lugar especial por haberse constituido en el transcurso de las últimas dos décadas en epicentro de la investigación en biodiversidad marina: Isla Gorgona. Su condición insular y de Parque Nacional Natural hacen de ella, aunque poco accesible, un escenario ideal para la observación contemplativa y minuciosa de las muchas expresiones que la naturaleza ha sabido reunir allí, tanto en tierra como en las aguas que la circundan. Es lugar de paso obligado para grandes cetáceos y aves migratorias, posee formaciones coralinas que albergan una característica diversidad de peces e invertebrados, además de playas, acantilados, fondos de arena de roca que propician la coexistencia de variadas y contrastantes comunidades bióticas que han cautivado la atención de biólogos y estudiantes, lo que le ha valido el calificativo de "isla ciencia". Este libro da a conocer sus atributos naturales.
  • Bioproduits issus des coproduits déchets marins : Livre Blanc

    Lassoued, Jihen; Curcuraci, Eleonora; Besbes, Nadia; Adamos, Antonino; Zili, Fatma; Bessadok, Boutheina; Catalano, Rosario; Mensi, Fethi; Bouraoui, Zied; Jaouadi, Bassem; et al. (Institut National des Sciences et Technologie de la Mer - INSTM, 2023)
    Marine waste, including aquatic by-products, poses a significant environmental challenge and garners increasing attention for its potential valorization. The development of cost-effective, environmentally friendly, and circular technologies for transforming marine biomass into value-added products is crucial for the successful implementation of sustainable aquatic industries. This involves focusing on strategies that simultaneously reduce waste and energy demand. This document presents the research andbiotechnological innovations carried out under the ARIBiotech project, which aims to create new biological products from marine waste. In a circular economy perspective, this initiative seeks to turn sources of pollution into sustainable opportunities, contributing to the preservation of marine ecosystems while fostering innovative solutions. Exploiting marine biomass and valorizing sea by-products, whether by using them directly or extracting biopolymers, appears to be a promising solution for a more sustainable use of marine resources, leading to increased economic benefits. However, the realization of such developments is hindered by the lack of appropriate regulatory frameworks to enable the use of waste and by-products, ensuring product safety, quality, and acceptability. This white paper showcases a diverse range of bioproducts (Crab waste hydrolyzate, chitin, chitosan, collagen, gelatin, cellulose aerogels, shell powder, and bioactive extracts) derived from the application of biotechnologies on various marine waste and co-products,highlighting their potential to support sustainable development. This document aims to encourage policymakers to support the creation of alliances and innovations in blue biotechnology and enable the general public to benefit from advances in creating bioproducts from marine waste.
  • Les peuplements macro-benthiques dans le golfe de Tunis : Systématique inventaire, bionomie, organisation et groupes fonctionnels.

    Ayari Kliti, Rakia (Université de Carthage. Faculté des Sciences de Bizerte. Laboratoire de Biosurveillance de l’Environnement, 2010)
    Le présent travail porte sur l’étude systématique et écologique du benthos dans les principaux étages bathymétriques du golfe de Tunis par le biais de plusieurs approches, dans le but d’établir l’état écologique du milieu. Il s’agit des paramètres de biodiversité, des faciès bionomiques, des interactions biotiques et abiotiques et des indices biotiques basés sur les groupes trophiques et les groupes écologiques. Cette étude a permis dans un premier temps d’enrichir la liste des invertébrés benthiques inventoriés dans le golfe de Tunis. Il s’agit de 4 espèces de Bryozoaires nouvelles pour la science (Trematooecia ligulata Ayari et Taylor, 2008, Herentia baptooecium sp. nov., Herentia orthosa sp. nov. et Cellepora sinusa sp. nov) et de 70 espèces nouvelles pour la Tunisie dont 24 Polychètes, 24 Bryozoaires, 7 Cnidaires et 5 Amphipodes. De plus, la description des faciès bionomiques a permis de préciser les limites des étages, mais également de tirer des renseignements scientifiques intéressants. Ainsi, au centre du golfe, l’étage bathyal supérieur commence à -120 m, après une légère déclivité du plateau continental à environ -100 m. La zone qui s’étend du nord de Ras El Fartas vers le large en passant par l’ouest de l’île de Zembra, est occupée par un herbier de Posidonies à -21 m et suivie d’un détritique côtier caractérisant la limite supérieure du circalittoral puis d’un détritique du large dont les caractéristiques témoignent de la régression du circalittoral. Au niveau de la troisième zone et en face de Sidi Daoued et de Ras El Ahmar, l’herbier de Posidonies se situe entre -22 et -38 m de profondeur. Ensuite, des faciès de sédiments meubles et de maërl en bon état se succèdent. A environ -67 m de profondeur, apparaît le rebord du plateau continental, suivi à -130 m, par l’étage bathyal supérieur vaseux. Au niveau de la quatrième zone, en face de Ras Gammarth, des tâches de Posidonies et de Cymodocées sont suivies d’un détritique côtier à -79 m, puis de la déclivité du plateau continental marquant le passage du circalittoral inférieur à l’étage bathyal supérieur caractérisé jusqu’ à -137 m par une vase appauvrie. Au niveau de la zone ouest, nous enregistrons un envasement en face de la lagune de Ghar El Melh et un faciès de maërl en face de Sidi Ali El Mekki. L’étude de la distribution des Polychètes en fonction des paramètres environnementaux considérés a permis quant à elle de déterminer les préférendums écologiques des espèces principales. Elle a montré, entre autres, que les Polychètes ne sont pas distribués dans le golfe de Tunis en fonction d’un seul gradient abiotique et que la profondeur joue ici un rôle primordial. L’approche écologique a été basée sur l’utilisation de plusieurs indices biotiques, et les résultats obtenus montrent que l’indice BENTIX est le plus fiable pour le cas du golfe de Tunis. L’utilisation conjointe des principaux indices a montré que l’état écologique est satisfaisant au large de Sidi Ali El Mekki, en face de Cap Farina, autour de l’île de Zembra, au nord du Cap Bon et en face de Ras El Ahmar et que le reste de la zone est en légère perturbation ou en changement vers un état de déséquilibre
  • Land use and cover drives taxonomic and functional diversity of aquatic insects across tropical streams.

    Contieri, Beatriz Bosquê (Universidade Estadual de Maringá. Departamento de Biologia. Programa de Pós-Graduação em Ecologia de Ambientes Aquáticos Continentais., 2024)
    Streams are ecosystems closely dependent to their adjacent ecotones, representing important water recharge sources for drainage networks and playing a central role in global nutrient cycling. The primary source of energy in streams comes from allochthonous material originating from riparian vegetation, which becomes available through processing performed by aquatic organisms. Modifications in the composition of the adjacent vegetation, which can be natural or due to land use and occupation, may alter the ecosystem functioning. Despite their critical role in preserving biodiversity, riparian ecosystems face continuous alteration or even removal. Anthropogenic activities, such as excessive use of pesticides and fertilizers in rural areas, and catchment imperviousness in urban areas, for example, negatively affect water quality, leading to contamination and disruptions in the food chain. Studies predominantly focus on densely forested riparian zones, composed mainly of trees, but natural riparian zones with herbaceous or shrubby vegetation have effects less explored when compared to woody vegetation. These include differences in channel stability and morphology, because woody vegetation is more suitable for stabilization of stream banks than herbaceous vegetation. These differences are particularly relevant for organisms like aquatic insects, that play a fundamental role in energy transfer to higher trophic levels and are widely used as bioindicators, given their sensitivity to environmental changes. Metrics such as richness and abundance are commonly used to estimate levels of biodiversity, but for a comprehensive understanding of the role of such species in ecosystem functioning, it is essential to also consider functional diversity. In this context, the following aspects were assessed: i) the effect of sub-basin riparian vegetation stratum (tree x shrub) on the composition and beta-diversity of aquatic insects in tropical streams and ii) the relationship between different levels of anthropogenic intensification and taxonomic and functional indices of aquatic insects, as well as their relationship with environmental variables. The study concluded that functional diversity was more sensitive than taxonomic diversity to changes related to land use and cover in riparian vegetation. Vegetation stratum (tree and shrub) significantly altered total functional diversity, while anthropogenic intensification significantly reduced all functional indices analysed and only one taxonomic index. The results obtained and analysed contributed to an analytical understanding of the functioning of tropical aquatic ecosystems. Furthermore, the study provides valuable parameters and insights for future predictions and mitigation strategies in environments affected by human activities.
  • Massive stranding of Physalia physalis (Hydrozoa: Physaliidae) on the Northwestern coast of Cuba.

    Torres-Conde, Eduardo Gabriel; Rodríguez-Martínez, Rosa E. (2024)
    Revista de Investigaciones Marinas
    Historically, Physalis physalis (Linnæus, 1758) massive stranding events have been either infrequent or poorly documented. However, their occurrence can significantly affect human health and the stability of coastal ecosystems. This study analyzes a massive P. physalis stranding that affected Cuba’s NW coast in December 2022. During the event, eighty-five people were stung, with 38 having strong allergic reactions. To determine P. physalis abundance, we counted all colonies during the massive event along ~ 3 km coast within a 5 m strip. Density, dimorphic form (left/right-handed), and colony size were quantified using a 0,25 m2 quadrat placed every 50 m, 10 m from the shoreline. Over ten thousand beach cast colonies were recorded, making this the event with the highest mean colony density (29,3 per m2) ever reported. The massive stranding coincided with the lowest Arctic Oscillation index (-2,59) in the past 11 years during December, which led to northeasterly winds reaching up to 24 km/h, which might have favored the landings. Wind direction and speed, coupled with the dominance of left-handed colonies (71,4%), suggest the North Atlantic Subtropical Gyre as a possible origin source of the bloom. The high prevalence of juvenile P. physalis colonies (68%) likely aligns with the autumn breeding season in the northern hemisphere. The potential causes of P. physalis blooms are still poorly understood. Systematic monitoring of the distribution and abundance of this species should be a research priority considering the potential risk to human health and the fact that the blooms could become more frequent on the Atlantic coasts due to its eutrophication and climate change.

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