Find research datasets worth reusing
Search datasets from major research repositories and use ShareScore to quickly assess how well each record supports discovery, access, and reuse.
918
datasets available to search
ShareScore release 0.7.1
Dataset results
918 results for “oceanic islands”
FIGURES 1–12 in Angusticopula rowlingiana, a new melosiroid diatom (Bacillariophyta) from Ascension Island (South Atlantic Ocean)
FIGURES 1–12. Angusticopula rowlingiana Van de Vijver, Wilfert, D.M.John & Houk sp. nov. Light microscope pictures taken from the holotype population (sample from Bamboo) from Green Mountain, Ascension Island. Figs 1–3 LM photographs of several frustules and valves in girdle and valve face view showing numerous discoid plastids. Figs 4–7 LM photographs of frustules in girdle view. Figs 6 & 7 show the presence of internal valves. Figs 8–12 LM photographs in valve face view. Scale bar represents 10 μm.
FIGURE 5 in Cyperus stroudii (CYPERACEAE), a new species from Ascension Island, South Atlantic Ocean
FIGURE 5. Close up of Cyperus stroudii characters (a) spikelets, glumes and nutlet (x 8 magnification red line is 6.4 mm) and (b) Nutlet(x 32 magnification yellow line is 1.6 mm).
FIGURE 2 in Cyperus stroudii (CYPERACEAE), a new species from Ascension Island, South Atlantic Ocean
FIGURE 2. (a) Principal Co-ordinate analysis using the Gower metric of morphological variables between two morphotypes grown under common environmental conditions from seed collected from Ascension Islands. (b) Principal co-ordinate analysis of Ascension plants and herbarium specimens collected across the geographic range. Lines represent convex hulls round geographically separated populations.
FIGURE 1 in Cyperus stroudii (CYPERACEAE), a new species from Ascension Island, South Atlantic Ocean
FIGURE 1. Tall (a) and dwarf (b) morphotype populations assumed to be C. appendiculatus (c) location of seed collection sampling from each of the two Cyperus populations on Ascension.
FIGURE 3 in Cyperus stroudii (CYPERACEAE), a new species from Ascension Island, South Atlantic Ocean
FIGURE 3. Boundary of the type locality for Cyperus stroudii marked in red and place names mentioned in the text.
FIGURE 4 in New and rare bivalve species for the fauna of the Kuril Islands (northwestern Pacific Ocean): A study of materials collected over 70 years of expeditions (from 1949 to 2019)
FIGURE 4. New and rare bivalve species for the fauna of the Kuril Islands. (A, B) Macoma torelli (Kunashir Island, 220 m, shell length 16.0 mm). (C, D) Kellia comandorica (Urup Island, 20 m, shell length 13.2 mm). (E, F) Kellia kussakini (Urup Island, 10 m, shell length 3.8 mm). (G, H) Adontorhina cyclia (Kunashir Island, 200 m, shell length 2.2 mm). (I–L) Adontorhina inflata (Zelyony Island, 1,742 m): I, exterior view of right valve (shell length 1.4 mm); J–L, scanning electron micrographs: (J) right valve (interior view), (K) both valves (dorsal view; RV up), (L) hinge plate of right valve. (M, P) Netastoma japonicum (South Kuril Strait, 25 m, shell length 12.7 mm). Scale bars: J–L=100 μm.
FIGURE 2 in New and rare bivalve species for the fauna of the Kuril Islands (northwestern Pacific Ocean): A study of materials collected over 70 years of expeditions (from 1949 to 2019)
FIGURE 2. New and rare bivalve species for the fauna of the Kuril Islands. (A, B) Acila divaricata (Kunashir Strait, 200 m, shell length 29.7 mm). (C, D) Acila insignis (Yuri Island, 1000 m, shell length 11.0 mm). (E, F) Nuculana ensiformis (Shikotan Island, 200 m, shell length 22.5 mm). (G, H) Poroleda ushakovi (Shumshu Island, 820 m, shell length 17.1 mm). (I, J) Robaia robai (Kunashir Strait, 300 m, shell length 16.3 mm). (K, L) Yoldia hyperborea (Paramushir Island, 215 m, shell length 19.0 mm). (M, N) Scanning electron micrographs of Huxleyia pentadonta (Paramushir Island, 214 m, shell length 2.3 mm). (O, P) Samacar kurilensis (Iturup Island, 265–270 m, shell length 16.5 mm). (Q, R) Tetrarca boucardi (Shpanberg Strait, 55 m, shell length 20.0 mm). (S, T) Limopsis oliveri (Urup Island, 50 m, shell length 9.0 mm). (U, V) Limopsis vaginata (Iturup Island, 600 m, shell length 26.3 mm).
FIGURE 3 in New and rare bivalve species for the fauna of the Kuril Islands (northwestern Pacific Ocean): A study of materials collected over 70 years of expeditions (from 1949 to 2019)
FIGURE 3. New and rare bivalve species for the fauna of the Kuril Islands. (A, B) Limatula attenuata (Iturup Island, 330 m, shell length 6.6 mm). (C, D) Limatula subauriculata (Iturup Island, 50 m, shell length 4.6 mm). (E, F) Musculus impressus (Urup Island, 123 m, shell length 17.7 mm). (G, H) Parvamussium intuscostatum (Onekotan Island, 146–147 m, shell length 17.2 mm). (I, J) Cardiomya cf. tosaensis (Urup Island, 100 m, shell length 7.8 mm). (K, L) Cetoconcha hyalina (Onekotan Island, 150–198 m, shell length 44.0 mm). (M, N) Dermatomya tenuiconcha (Simushir Island, 100 m, shell length 12.0 mm). (O, P) Poromya castanea (Iturup Island, 290 m, shell length 20.5 mm). (Q, R) Parvithracia sirenkoi (Paramushir Island, 400 m, shell length 7.0 mm). (S, T) Panomya ampla (Onekotan Island, 57 m, shell length 61.6 mm).
Data from: Drift, not selection, shapes toll-like receptor variation among oceanic island populations
Understanding the relative role of different evolutionary forces in shaping the level and distribution of functional genetic diversity among natural populations is a key issue in evolutionary and conservation biology. To do so accurately genetic data must be analyzed in conjunction with an unambiguous understanding of the historical processes that have acted upon the populations. Here we focused on diversity at toll-like receptor (TLR) loci, which play a key role in the vertebrate innate immune system and, therefore, are expected to be under pathogen-mediated selection. We assessed TLR variation within and among 13 island populations (grouped into three archipelagos) of Berthelot's pipit, Anthus berthelotii, for which detailed population history has previously been ascertained. We also compared the variation observed with that found in its widespread sister species, the tawny pipit, Anthus campestris. We found strong evidence for positive selection at specific codons in TLR1LA, TLR3 and TLR4. Despite this, we found that at the allele frequency level, demographic history has played the major role in shaping patterns of TLR variation in Berthelot's pipit. Levels of diversity and differentiation within and across archipelagos at all TLR loci corresponded very closely with neutral microsatellite variation, and with the severity of the bottlenecks that occurred during colonization. Our study shows that despite the importance of TLRs in combating pathogens, demography can be the main driver of immune gene variation within and across populations, resulting in patterns of functional variation that can persist over evolutionary timescales.
Data from: Exploring the role of Micronesian islands in the maintenance of coral genetic diversity in the Pacific Ocean
Understanding how genetic diversity is maintained across patchy marine environments remains a fundamental problem in marine biology. The Coral Triangle, located in the Indo-West Pacific, is the center of marine biodiversity and has been proposed as an important source of genetic diversity for remote Pacific reefs. Several studies highlight Micronesia, a scattering of hundreds of small islands situated within the North Equatorial Counter Current, as a potentially important migration corridor. To test this hypothesis, we characterized the population genetic structure of two ecologically important congeneric species of reef-building corals across greater Micronesia, from Palau to the Marshall Islands. Genetic divergences between islands followed an isolation-by-distance pattern, with Acropora hyacinthus exhibiting greater genetic divergences than A. digitifera, suggesting different migration capabilities or different effective population sizes for these closely related species. We inferred dispersal distance using a biophysical larval transport model, which helped explain an additional 15-21% of genetic variation compared to between-island geographic distance alone. For both species, genetic divergence accumulates and genetic diversity diminishes with distance from the Coral Triangle, supporting the hypothesis that Micronesian islands act as important stepping-stones connecting the central Pacific with the species rich Coral Triangle. However, for A. hyacinthus, the species with lower genetic connectivity, immigration from the sub-equatorial Pacific begins to play a larger role in shaping diversity than input from the Coral Triangle. This work highlights the enormous dispersal potential of broadcast-spawning corals and identifies the biological and physical drivers that influence coral genetic diversity on a regional scale.
FIGURE 1 in The fern genus Dryopteris (Dryopteridaceae) in Ascension and Saint Helena islands, Atlantic Ocean
FIGURE 1. Pinnules, scales and indusium of Dryopteris ascensionis. A, abaxial surface of proximal part of basal pinna showing the venation and basiscopic development; B, stipe scale; C & D, rachis scales; E & F, pinna-rachis scales; G lamina scales: abaxial surface; H & I, hairs from abaxial surface of lamina; J, indusium; Bb, Dd & Jj showing cellular structure of scales and indusium. Illustrations all based on Gordon 119 (K). Scale bars: A, 5 mm; B–F, I, 0.5 mm; G, H, Bb–Jj, 0.1 mm. Illustrations prepared by J.P. Roux.
FIGURE 4 in The fern genus Dryopteris (Dryopteridaceae) in Ascension and Saint Helena islands, Atlantic Ocean
FIGURE 4. Lectotype of Dryopteris napoleonis (Bory) Kuntze, Bèlangé s.n. (P00301433). MNNH, Paris Herbarium, 2012.
FIGURE 3 in The fern genus Dryopteris (Dryopteridaceae) in Ascension and Saint Helena islands, Atlantic Ocean
FIGURE 3. Pinnules, scales and indusium of Dryopteris napoleonis. A, abaxial surface of pinnules showing the venation and sori; B & C, stipe scales; D & E, rachis scales; F & G, pinna-rachis scales; H & I, hairs from abaxial surface of lamina; J, indusium; Dd, Ff & Jj showing cellular structure of scales and indusium. Illustrations all based on Burchell 172 (K). Scale bars: A, 5 mm; B, 0.5 mm; C–G, 0.5 mm; H–J, 0.1 mm; Dd–Jj, 0.1 mm. Illustrations prepared by J.P. Roux.
FIGURE 2 in The fern genus Dryopteris (Dryopteridaceae) in Ascension and Saint Helena islands, Atlantic Ocean
FIGURE 2. Pinnules, scales and indusium of Dryopteris cognata. A, abaxial surface of pinnules showing the venation and sori; B & C, stipe scales; D, rachis scale; E & F, pinna-rachis scales; G & H, lamina scales: abaxial surface; I, indusium; Bb, Dd, Ff, Gg & Ii showing cellular structure of scales and indusium. Illustrations all based on Hooker s.n. (K). Scale bars: A, 5 mm; B–H, 0.5 mm; I, 1 mm; Bb–Ii, 0.1 mm. Illustrations prepared by J.P. Roux.
FIG. 2 in Biogeography of spiders (Araneae: Arachnida) on the islands of the Southern Ocean
FIG. 2. Cluster diagram showing similarities of araneomorph faunas of the Southern Ocean islands (native fauna—post-second filter). Notes: (a) Cluster 'confidence limit' of Ss~0.1 shown by dotted line; (b) outliers in italics; (c) SPP Macquarie falls within SIP Cluster ii.
FIG. 3 in Biogeography of spiders (Araneae: Arachnida) on the islands of the Southern Ocean
FIG. 3. Cluster diagram showing similarities of araneomorph faunas of the Southern Ocean islands ('ancestral' fauna—generic data). Notes: (a) Cluster 'confidence limit' of Ss~0.1 shown by dotted line; (b) outliers in italics; (c) SPP Macquarie remains within SIP Cluster II.
FIG. 1 in Biogeography of spiders (Araneae: Arachnida) on the islands of the Southern Ocean
FIG. 1. Islands of the Southern Ocean defined in terms of the principal biogeographic regions and ocean provinces. Islands with spider records are in Roman typeface, those without are in italics.
FIGURE 1. Polysteganus mascarenensis n in Polysteganus mascarenensis, a new sparid fish species from Mascarene Islands, Indian Ocean
FIGURE 1. Polysteganus mascarenensis n. sp. A), SAIAB 84109 (holotype), 600 mm SL; B) SAIAB 84095 (paratype), 574 mm SL. Both were photographed by D. Tweddle. Arrow shows the height of posterior end of upper jaw under first two infraorbitals.
FIG. 1 in Biodiversity and biogeography of non-marine Mollusca on the islands of the Southern Ocean
FIG. 1. The islands of the Southern Ocean. Note: Islands within the study area and having land snails are in Roman type. Islands not within the study area but mentioned in text are in italics.
FIG. 6 in Vestimentiferans (Pogonophora) in the PaciŽc and Indian Oceans: a new genus from Lihir Island (Papua New Guinea) and the Java Trench, with the Žrst report of Arcovestia ivanovi from the North Fiji Basin
FIG. 6. Paraescarpia echinospica gen. nov., sp. nov., scanning electron micrographs: (A) opisthosoma (#3); (B) opisthosomal chaetae; (C) symbiotic bacteria in cells of the trophosome (arrow marks cell membrane); (D) spermatozoa in genital duct (# 1).
ScienceDex guides
Understand access before you commit
These curated guides explain access requirements, typical timelines, costs, and reuse considerations for widely used research datasets.
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.