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210 results for “Gulf of Guinea”
Green and hawksbill sea turtle nesting in the Gulf of Guinea: A 9-year survey
<p>Sea turtles are critical components of marine ecosystems, and their conservation is important for Ocean Governance and Global Planet Health. However, there is limited knowledge of their ecology in the Gulf of Guinea. To fill this knowledge gap, this study presents the first integrative assessment of green and hawksbill turtles in the region, combining nesting area surveys over 9 years, and telemetry data, to offer insights into these population dynamics, and behaviours including nesting preferences, morphological and reproductive parameters, diving patterns and inter-nesting core-use areas. Green turtles are likely making a recovery in São Tomé, potentially driven by sustained conservation efforts. In contrast, the status of the hawksbill turtle remains less clear. There are preliminary indications of recovery, but we interpret this cautiously. Coupled with satellite tracking, this study estimated that 482 to 736 green turtles, and 135 to 217 hawksbills, nest on the beaches of São Tomé. Their movements overlap significantly with a proposed Marine Protected Area (MPA), which suggests they may be well placed for conservation if managed appropriately. However, the presence of artisanal fisheries and emerging threats, such as sand mining and unregulated tourism, highlight the urgent need for robust management strategies that align global conservation objectives with local socioeconomic realities. This study significantly enhances our understanding of the ecology and conservation needs of the green and hawksbill turtles in the Gulf of Guinea. The insights gleaned here can contribute to the development of tailored conservation strategies that benefit these populations and the ecosystem services upon which they depend.</p>
ASSESSING THE CHLOROPHYLL-A VARIABILITY IN THE GULF OF GUINEA USING REMOTE SENSING DATA.
<h3>Introduction</h3> <p>The report begins by highlighting the importance of oceans in influencing the Earth’s climate and supporting marine life. It focuses on phytoplankton, which are crucial for the marine food web and global carbon cycle. The study aims to evaluate the variability of chlorophyll-a (Chl-a) and sea surface temperature (SST) in the Gulf of Guinea using satellite remote sensing data.</p> <h3>Materials and Methods</h3> <ul> <li><strong>Study Site</strong>: The Gulf of Guinea, located on the eastern edge of the Atlantic Ocean, bordered by several West African countries.</li> <li><strong>Data</strong>: Monthly Chl-a and SST data from the Aqua-MODIS satellite, covering the period from 2020 to 2022.</li> <li><strong>Methods</strong>: Analysis of satellite images using Python programming to evaluate spatiotemporal variability and conduct time series analysis.</li> </ul> <h3>Results and Discussion</h3> <ul> <li><strong>Chlorophyll-a Variability</strong>: The study found significant spatial and temporal variability in Chl-a concentrations, with higher values near the coastline due to nutrient inputs from rivers and coastal upwelling.</li> <li><strong>Sea Surface Temperature Variability</strong>: SST showed relatively uniform spatial distribution but notable seasonal and interannual variability, influenced by climatic phenomena like the West African Monsoon.</li> <li><strong>Interannual and Monthly Climatology Variability</strong>: The report discusses the seasonal patterns and the influence of environmental factors on Chl-a and SST.</li> </ul> <h3>Conclusion</h3> <p>The study concludes that Chl-a concentrations are higher near the coast due to nutrient inputs and coastal upwelling, while SST shows a consistent seasonal cycle. These findings provide insights into the dynamic nature of marine productivity in the Gulf of Guinea and the influence of environmental factors on phytoplankton biomass.</p>
Figure 1 in Reproductive biology of Elops lacerta (Elopiformes: Elopidae) in the Gulf of Guinea, Côte d'Ivoire, West Africa
Figure 1. – Fishing area and Abidjan fishing harbour.
Fig. 1 in Four new species of Turbonilla (Gastropoda, Pyramidellimorpha, Turbonillidae) from the Gulf of Guinea, West Africa
Fig. 1. Study area and sampling sites.
Green and hawksbill sea turtle nesting in the Gulf of Guinea: A 9-year survey
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Data from: Idiosyncratic responses to climate-driven forest fragmentation and marine incursions in reed frogs from Central Africa and the Gulf of Guinea Islands
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Subspecies and Distribution. E. d. dianae Hill, 1956 - Solomon Is (Malaita, Guadalcanal, and Rennell). E. d. fruhstorferi Flannery, 1994 — Papua New Guinea (Western, Southern Highlands, and Gulf provinces). E. d. rickwooodi Flannery, 1994 - Bismarck Archipelago (Mussau, New Britain, and New Ireland Is), and N & W Solomon Is (Bougainville and Santa Isabel Is). in Emballonuridae
Subspecies and Distribution. E. d. dianae Hill, 1956 - Solomon Is (Malaita, Guadalcanal, and Rennell). E. d. fruhstorferi Flannery, 1994 — Papua New Guinea (Western, Southern Highlands, and Gulf provinces). E. d. rickwooodi Flannery, 1994 - Bismarck Archipelago (Mussau, New Britain, and New Ireland Is), and N & W Solomon Is (Bougainville and Santa Isabel Is).
Subspecies and Distribution. D. w. wollastoni Thomas, 1913 known only from Utakwa River, Fakfak regency, West Papua Province, Indonesia. D. w. fasensis Flannery & Colgan, 1993 known only from North Coastal Range, N Sandaun Province, Papua New Guinea. D. w. parnabyi Flannery & Colgan, 1993 — Central Range in Sandaun, Western, Southern Highlands, Chimbu, Gulf, and Morobe provinces, mostly reported near Tifalmin and Telefomin, Papua New Guinea. in Hipposideridae
Subspecies and Distribution. D. w. wollastoni Thomas, 1913 known only from Utakwa River, Fakfak regency, West Papua Province, Indonesia. D. w. fasensis Flannery & Colgan, 1993 known only from North Coastal Range, N Sandaun Province, Papua New Guinea. D. w. parnabyi Flannery & Colgan, 1993 — Central Range in Sandaun, Western, Southern Highlands, Chimbu, Gulf, and Morobe provinces, mostly reported near Tifalmin and Telefomin, Papua New Guinea.
FIGURE 2 in The Bush Vipers, genus Atheris Cope, 1862 (Squamata: Viperidae) of Bioko Island Gulf of Guinea, with the description of a new species
FIGURE 2. Distribution map of the Atheris on Bioko Island. Orange circles: Atheris squamigera; Blue stars: Atheris hetfieldi sp. nov.
FIGURE 4 in The Bush Vipers, genus Atheris Cope, 1862 (Squamata: Viperidae) of Bioko Island Gulf of Guinea, with the description of a new species
FIGURE 4. Comparison of the suprarostral scales of Atheris squamigera and A. hetfieldi sp. nov. from Bioko Island.
Data from: Elasmobranch bycatch in the demersal prawn trawl fishery in the Gulf of Papua, Papua New Guinea
The elasmobranch bycatch of the Gulf of Papua Prawn Fishery is investigated in detail for the first time. Fisheries observers collected data on the elasmobranch bycatch from a total of 403 trawl sets (1,273 hrs) in the Gulf of Papua. A total of 40 species of elasmobranchs were recorded ranging in size from a 12 cm disc width stingray to a 350 cm total length sawfish. High mortality rates were recorded (>80%), attributed to the long trawl durations (up to 4 hours). The future inclusion of bycatch reduction devices would likely reduce the number of larger elasmobranchs being caught and is being investigation by the PNG National Fisheries Authority. Differences in catch compositions were detected across the management zones as well as between the two monsoonal seasons (SE Monsoon and NW Monsoon). Increased monitoring and additional research is required and management plans should address the elasmobranch bycatch and in particular their high mortality rate.
FIGURE 23 in Coastal Fishes of São Tomé and Príncipe islands, Gulf of Guinea (Eastern Atlantic Ocean)-an update
FIGURE 23. Nematogobius brachynemus, animal from São Tomé (no precise locality data available), photo J.L. Gasparini.
FIGURE 24 in Coastal Fishes of São Tomé and Príncipe islands, Gulf of Guinea (Eastern Atlantic Ocean)-an update
FIGURE 24. Wheelerigobius maltzani, animal from São Tomé (no precise locality data available), photo J.L. Gasparini.
FIGURE 2 in First record of Tardigrada from São Tomé (Gulf of Guinea, Western Equatorial Africa) and description of Pseudechiniscus santomensis sp. nov. (Heterotardigrada: Echiniscidae)
FIGURE 2. Cuticular plate ornamentation of: A, Pseudechiniscus santomensis sp. nov. (holotype); B, P. bartkei; C, P. gullii; D, P. quadrilobatus; E, P. spinerectus and F, P. novaezeelandiae novaezeelandiae. Arrows indicate delicate striae connecting the dots. Scale bars = 10 µm.
FIGURE 1 in First record of Tardigrada from São Tomé (Gulf of Guinea, Western Equatorial Africa) and description of Pseudechiniscus santomensis sp. nov. (Heterotardigrada: Echiniscidae)
FIGURE 1. Pseudechinscus santomensis sp. nov., A, Anterior portion of the body of the holotype; the W-shaped fold of the head plate (arrow a), the transverse fold dividing the scapular plate into an anterior and a posterior portion (arrow b), the transverse fold dividing the median plate 1 into an anterior and a posterior portion (arrow c), the buccal cirri, the cephalic papilla (arrow d), the cirrus A and the adjacent clava (arrow e) are visible. B, posterior portion of the body of the holotype; the transverse fold dividing the median plate 2 into an anterior and a posterior portion (arrow a), the intersegmental platelets lateral to the median plates 1 and 2 (arrows b, c), the triangular marginal projections of the undivided pseudosegmental plate (arrows d, e), the papilla on the hind legs (arrow f) are visible. C, posterior portion of the body of a paratype; the undivided median plate 3 (arrow a) and the pseudosegmental plate with reduced marginal projections (arrows b, c) are visible. D, cuticular ornamentation of the ventral body surface of a paratype. The arrows indicate spurs of the internal claws. Scale bars = 10 µm.
FIGURE 1 in Lost in the middle of the sea, found in the back of the shelf: A new giant species of Trachylepis (Squamata: Scincidae) from Tinhosa Grande islet, Gulf of Guinea
FIGURE 1. Geographical location of Tinhosas islets and aerial photo of Tinhosa Grande and Tinhosa pequena (Photo by Luis Ceríaco). Each colored region corresponds to the geographical distribution of different Trachylepis species. Brown areas: Nominotypic T. maculilabris and T. affinis; Green area: T. cf. maculilabris—Príncipe; Orange area: T. cf. maculilabris—São Tomé; Blue area: T. ozorii; Red area: Tinhosas population.
FIGURE 4 in Lost in the middle of the sea, found in the back of the shelf: A new giant species of Trachylepis (Squamata: Scincidae) from Tinhosa Grande islet, Gulf of Guinea
FIGURE 4. Trachylepis adamastor sp. nov. feeding on a recently broken egg (specimen not collected). Photo by Ross Wanless.
FIGURE 3 in Lost in the middle of the sea, found in the back of the shelf: A new giant species of Trachylepis (Squamata: Scincidae) from Tinhosa Grande islet, Gulf of Guinea
FIGURE 3. Live photo of Trachylepis adamastor sp. nov. (specimen not collected), from Tinhosa Grande. Photo by Ross Wanless.
FIGURE 12 in First record of Tanaidacea (Crustacea) from a deep-sea coral reef in the Gulf of Guinea
FIGURE 12. Cryptocopoides obaloba sp. nov., female. A, cheliped; B, pereopod-1; C, pereopod-2; D, pereopod-3; E, pereopod-4; F, pereopod-5; G, pereopod-6; H, pleopod; I, uropod. Scale bars: 0.1 mm.
FIGURE 13 in First record of Tanaidacea (Crustacea) from a deep-sea coral reef in the Gulf of Guinea
FIGURE 13. Pseudotanais (Pseudotanais) artoo sp. nov., holotype female. A, body lateral view; B, body dorsal view. Scale bar: 0.5 mm.
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Allen Brain Atlas
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Annotated Behaviour and Observability Dataset (ABODe)
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DANDI Archive for NWB datasets
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International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.