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918 results for “oceanic islands”
Figs 74–115. Three new Arcanodiscus species from Campbell Island. 74–80 in Revision of the non-marine centric diatom flora (Bacillariophyta) of the sub-Antarctic Campbell Island (southern Pacific Ocean) with the descriptions of five new species
Figs 74–115. Three new Arcanodiscus species from Campbell Island. 74–80. Arcanodiscus crawfordianus Goeyers & Van de Vijver sp. nov. LM. Campbell Island holotype population, sample BAS303 (BR-4579). Several valves in valve face view showing clearly the large central area, the irregularly scattered spines and the marginal striae. 81–96. Arcanodiscus indistinctus Goeyers & Van de Vijver sp. nov. LM. Campbell Island holotype population, sample BAS303 (BR-4580). 81. Frustule in girdle view showing the discoid chloroplasts. 82. Frustule in girdle view. 83–96. Several valves in valve face view. Note the thick mantle in some of the valves and the large central area. 97–115. Arcanodiscus saundersianus Goeyers & Van de Vijver sp. nov. LM. Campbell Island holotype population, sample BAS272 (BR-4581). 97–101. Several frustules in girdle view, often connected to each other. 102–115. Several valves in valve face view. Note the thick mantle in some of the valves and the relatively small central area. The marginal striae are hardly visible in LM. Scale bars = 10 μm.
Figs 37–43 in Revision of the non-marine centric diatom flora (Bacillariophyta) of the sub-Antarctic Campbell Island (southern Pacific Ocean) with the descriptions of five new species
Figs 37–43. Angusticopula cosmica Goeyers & Van de Vijver sp. nov. SEM. Campbell Island holotype population, sample BAS303 (BR-4577). 37. Frustule showing both the valve face and girdle formed by open, narrow copulae. The arrows indicate the ligulae. 38. Detail of the mantle valve with the serrated mantle edge (double arrow) and the ligulate copulae (single arrow). 39. Valve in girdle view showing the striated mantle, the narrow ridge bordering the mantle/valve face junction (black arrows) and the typical groove bordering the mantle edge (double white arrow). 40. External view of a valve face showing the dense pattern of granules. 41. External detail of the very fine striae, the small, rounded areolae and the narrow ridge bordering the valve margin. 42. Internal view of an entire valve showing the rimoportulae and the thick mantle. 43. Internal detail of the valve with some rimoportulae. Scale bars: 37–39, 42 = 10 μm; 40 = 5 μm; 41, 43 = 1 μm.
Figure 6. Diplecogaster tonstricula n in Diplecogaster tonstricula, a new species of cleaning clingfish (Teleostei: Gobiesocidae) from the Canary Islands and Senegal, eastern Atlantic Ocean, with a review of the Diplecogaster-ctenocrypta species-group
Figure 6. Diplecogaster tonstricula n. sp., Canary Islands, Tenerife, Rogelio. Photograph by Joaquín Guitérrez, February 2015.
Figure 4. Diplecogaster tonstricula n in Diplecogaster tonstricula, a new species of cleaning clingfish (Teleostei: Gobiesocidae) from the Canary Islands and Senegal, eastern Atlantic Ocean, with a review of the Diplecogaster-ctenocrypta species-group
Figure 4. Diplecogaster tonstricula n. sp., Senegal, Ngor Island, 28 m depth. Photograph by P. Wirtz, October 2009.
Figure 2. Diplecogaster tonstricula n in Diplecogaster tonstricula, a new species of cleaning clingfish (Teleostei: Gobiesocidae) from the Canary Islands and Senegal, eastern Atlantic Ocean, with a review of the Diplecogaster-ctenocrypta species-group
Figure 2. Diplecogaster tonstricula n. sp., CCML uncat., paratype, specimen 1, 22.9 mm SL. Pelvic disc. Bar 1 mm.
Figure 9. Diplecogaster ctenocrypta Briggs 1955, ZMUC P9037 in Diplecogaster tonstricula, a new species of cleaning clingfish (Teleostei: Gobiesocidae) from the Canary Islands and Senegal, eastern Atlantic Ocean, with a review of the Diplecogaster-ctenocrypta species-group
Figure 9. Diplecogaster ctenocrypta Briggs 1955, ZMUC P9037, holotype, 15.7 mm SL, Gran Canaria. (A) dorsal view of head; (B) ventral view of head. Bar 1 mm.
Figure 1. Diplecogaster tonstricula n in Diplecogaster tonstricula, a new species of cleaning clingfish (Teleostei: Gobiesocidae) from the Canary Islands and Senegal, eastern Atlantic Ocean, with a review of the Diplecogaster-ctenocrypta species-group
Figure 1. Diplecogaster tonstricula n. sp., ZSM 40089, holotype, 21.3 mm SL, Senegal. (A) Lateral view; (B) dorsal view. Bar 3 mm.
Figure 5. Diplecogaster tonstricula n in Diplecogaster tonstricula, a new species of cleaning clingfish (Teleostei: Gobiesocidae) from the Canary Islands and Senegal, eastern Atlantic Ocean, with a review of the Diplecogaster-ctenocrypta species-group
Figure 5. Diplecogaster tonstricula n. sp. cleaning a moray eel, Gymnothorax afer, Senegal, Ngor Island. Photograph by P. Wirtz, October 2009.
Figure 8. Diplecogaster ctenocrypta Briggs 1955, ZMUC P9037 in Diplecogaster tonstricula, a new species of cleaning clingfish (Teleostei: Gobiesocidae) from the Canary Islands and Senegal, eastern Atlantic Ocean, with a review of the Diplecogaster-ctenocrypta species-group
Figure 8. Diplecogaster ctenocrypta Briggs 1955, ZMUC P9037, holotype, 15.7 mm SL, Gran Canaria. Pelvic disc. Bar 1 mm.
Figure 7. Diplecogaster ctenocrypta Briggs 1955, ZMUC P9037 in Diplecogaster tonstricula, a new species of cleaning clingfish (Teleostei: Gobiesocidae) from the Canary Islands and Senegal, eastern Atlantic Ocean, with a review of the Diplecogaster-ctenocrypta species-group
Figure 7. Diplecogaster ctenocrypta Briggs 1955, ZMUC P9037, holotype, 15.7 mm SL, Gran Canaria. (A) Lateral view; (B) dorsal view. Bar 2 mm.
Climate drives community-wide divergence within species over a limited spatial scale: evidence from an oceanic island
<p><span>Geographic isolation substantially contributes to species endemism on oceanic islands when speciation involves the colonisation of a new island. However, less is understood about the drivers of speciation within islands. What is lacking is a general understanding of the geographic scale of gene flow limitation within islands, and thus the geographic scale and drivers of geographical speciation within insular contexts. Using a community of beetle species, we show that when dispersal ability and climate tolerance are restricted, microclimatic variation over distances of only a few kilometres can maintain strong geographic isolation and drive incipient speciation. Further to this, we demonstrate congruent diversification with gene flow across species, mediated by Quaternary climate oscillations that have facilitated a dynamic of isolation and secondary contact. The unprecedented scale of parallel species responses to a common environmental driver for evolutionary change has profound consequences for understanding past and future species responses to climate variation.</span></p>
Supplementary material 1 from: Vieites DR, Nieto-Román S, Peso Fernández M, Santos-Santos JH (2020) Hidden in plain sight: a new frog species of the genus Blommersia from the oceanic island of Mayotte, Comoros archipelago. ZooKeys 994: 149-166. https://doi.org/10.3897/zookeys.994.57012
Data descriptor for Blommmersia nataliae sp. nov.
Figure 3 from: Vieites DR, Nieto-Román S, Peso Fernández M, Santos-Santos JH (2020) Hidden in plain sight: a new frog species of the genus Blommersia from the oceanic island of Mayotte, Comoros archipelago. ZooKeys 994: 149-166. https://doi.org/10.3897/zookeys.994.57012
Figure 3 Dorsolateral and ventral views of Blommersia transmarina DRV6807 (MNCN50446), adult male collected at Mont M'Sapere in 2012 by D. Vieites and M. Peso Fernández. Note the shape and color of the femoral glands.
Figure 5 from: Vieites DR, Nieto-Román S, Peso Fernández M, Santos-Santos JH (2020) Hidden in plain sight: a new frog species of the genus Blommersia from the oceanic island of Mayotte, Comoros archipelago. ZooKeys 994: 149-166. https://doi.org/10.3897/zookeys.994.57012
Figure 5 Photo of three specimens of Blommersia nataliae sp. nov. during reproduction in a cut bamboo trunk filled with water. On top of the picture, a male can be seen on top of a female, and another male is in the water on the left side of the trunk.
Figure 1 from: Vieites DR, Nieto-Román S, Peso Fernández M, Santos-Santos JH (2020) Hidden in plain sight: a new frog species of the genus Blommersia from the oceanic island of Mayotte, Comoros archipelago. ZooKeys 994: 149-166. https://doi.org/10.3897/zookeys.994.57012
Figure 1 Maximum Likelihood phylogram of 16S rRNA relationships within Blommersia. Maximum Likelihood bootstrap support is shown above branches.
Figure 2 from: Vieites DR, Nieto-Román S, Peso Fernández M, Santos-Santos JH (2020) Hidden in plain sight: a new frog species of the genus Blommersia from the oceanic island of Mayotte, Comoros archipelago. ZooKeys 994: 149-166. https://doi.org/10.3897/zookeys.994.57012
Figure 2 Dorsolateral and ventral views of the holotype of Blommersia nataliae sp. nov. DRV6867 (MNCN50456). Note the color and shape of the femoral glands which are a diagnostic character to distinguish it from its sister taxon B. transmarina.
Figure 4 from: Vieites DR, Nieto-Román S, Peso Fernández M, Santos-Santos JH (2020) Hidden in plain sight: a new frog species of the genus Blommersia from the oceanic island of Mayotte, Comoros archipelago. ZooKeys 994: 149-166. https://doi.org/10.3897/zookeys.994.57012
Figure 4 Scatterplot of relative femoral gland length (FGL/SVL ratio) and the relative distance between the inner edges of the femoral glands (FGD/SVL) in the two new species from Mayotte and their sister taxon Blommersia wittei from Madagascar. Measurements are based on Table 1; and for B. wittei on Vences et al. (2010) and Pabijan et al. (2011). Note the intermediate position of B. wittei between B. transmarina and B. nataliae sp. nov.
FIGURE 5 in A new species of Eunice Cuvier, 1817 (Polychaeta: Eunicidae) from the slope of the Desventuradas Islands and seamounts of the Nazca Ridge, southeastern Pacific Ocean
FIGURE 5. Paratypes (SF5 (a) and SF7 (b)) red arrows indicate peristomial cirri; c) tubes
FIGURE 3. Eunice decolorhami n in A new species of Eunice Cuvier, 1817 (Polychaeta: Eunicidae) from the slope of the Desventuradas Islands and seamounts of the Nazca Ridge, southeastern Pacific Ocean
FIGURE 3. Eunice decolorhami n. sp.: a) mandibles; b) maxilar complex (paratype SCBUCN 8674).
Data from: Approximate Bayesian computation reveals the crucial role of oceanic islands for the assembly of continental biodiversity
The perceived low levels of genetic diversity, poor interspecific competitive and defensive ability, and loss of dispersal capacities of insular lineages have driven the view that oceanic islands are evolutionary dead ends. Focusing on the Atlantic bryophyte flora distributed across the archipelagos of the Azores, Madeira, the Canary Islands, Western Europe, and northwestern Africa, we used an integrative approach with species distribution modeling and population genetic analyses based on approximate Bayesian computation to determine whether this view applies to organisms with inherent high dispersal capacities. Genetic diversity was found to be higher in island than in continental populations, contributing to mounting evidence that, contrary to theoretical expectations, island populations are not necessarily genetically depauperate. Patterns of genetic variation among island and continental populations consistently fitted those simulated under a scenario of de novo foundation of continental populations from insular ancestors better than those expected if islands would represent a sink or a refugium of continental biodiversity. We, suggest that the northeastern Atlantic archipelagos have played a key role as a stepping stone for transoceanic migrants. Our results challenge the traditional notion that oceanic islands are the end of the colonization road and illustrate the significant role of oceanic islands as reservoirs of novel biodiversity for the assembly of continental floras.
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
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.