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206 results for “sub-Antarctic”
Data from: The influence of landscape, climate, and history on spatial genetic patterns in keystone plants (Azorella) on sub-Antarctic islands
The distribution of genetic variation in species is governed by factors that act differently across spatial scales. To tease apart the contribution of different processes, especially at intermediate spatial scales, it is useful to study simpler ecosystems such as those on sub-Antarctic oceanic islands. In this study, we characterize spatial genetic patterns of two keystone plant species, Azorella selago on sub-Antarctic Marion Island and Azorella macquariensis on sub-Antarctic Macquarie Island. Although both islands experience a similar climate and vegetation structure, they differ significantly in topography and geological history. We genotyped six microsatellites for 1149 individuals from 123 sites across Marion Island and 372 individuals from 42 sites across Macquarie Island. We tested for spatial patterns in genetic diversity, including correlation with elevation and vegetation type, and clines in different directional bearings. We also examined genetic differentiation within islands, isolation-by-distance with and without accounting for direction, and signals of demographic change. Marion Island was found to have a distinct northwest-southeast divide, with lower genetic diversity and more sites with signal of population expansion in the northwest. We attribute this to asymmetric seed dispersal by the dominant northwesterly winds, and to population persistence in a southwestern refugium during the last Glacial Maximum. No apparent spatial pattern, but greater genetic diversity and differentiation between sites, was found on Macquarie Island, which may be due to the narrow length of the island in the direction of the dominant winds and longer population persistence permitted by the lack of extensive glaciation on the island.
Data from: Plant dispersal in the sub-Antarctic inferred from anisotropic genetic structure
Climatic conditions and landscape features often strongly affect species' local distribution patterns, dispersal, reproduction and survival, and may therefore have considerable impacts on species' fine-scale spatial genetic structure (SGS). In this paper we demonstrate the efficacy of combining fine-scale SGS analyses with isotropic and anisotropic spatial autocorrelation techniques to infer the impact of wind patterns on plant dispersal processes. We genotyped 1304 Azorella selago (Apiaceae) specimens, a wind-pollinated and wind-dispersed plant, from four populations distributed across sub-Antarctic Marion Island. SGS was variable with Sp values ranging from 0.001 to 0.014, suggesting notable variability in dispersal distance and wind velocities between sites. Nonetheless, the data supported previous hypotheses of a strong NW – SE gradient in wind strength across the island. Anisotropic autocorrelation analyses further suggested that dispersal is strongly directional, but varying between sites depending on the local prevailing winds. Despite the high frequency of gale-force winds on Marion Island, gene dispersal distance estimates (σ) were surprisingly low (< 10 m), most likely because of a low pollen dispersal efficiency. An SGS approach in association with isotropic and anisotropic analyses provides a powerful means to assess the relative influence of abiotic factors on dispersal, and allow inferences that would not be possible without this combined approach.
FIGURE 7. Pseudingolfiella possessionis n in Description of Pseudingolfiella possessionis n. sp. (Crustacea, Amphipoda) from sub-Antarctic Île de La Possession, Crozet archipelago: the second freshwater amphipod known from the Antarctic biome, a human introduction of Gondwanan ancestry?
FIGURE 7. Pseudingolfiella possessionis n. sp. SEM photographs. A. Aesthetascs on antenna 1. B. Accessory antenna on antenna 1, male. C. Detail of gnathopod 2, showing denticulate lamella and spine on posterior margin of dactylus. D. Pleopods 2, male. E. Pleopods 3, male. F. Uropods 1 and 2, male, lateral view showing undulate posterolateral margin of outer ramus. G. Uropods 1 and 2, male, oblique ventral view showing smoothly curved posteromedial margin of outer ramus. Scale bars: A: 0.025 mm; B: 0.05 mm; C: 10 µm; D−G: 0.1 mm.
FIGURE 4. Pseudingolfiella possessionis n in Description of Pseudingolfiella possessionis n. sp. (Crustacea, Amphipoda) from sub-Antarctic Île de La Possession, Crozet archipelago: the second freshwater amphipod known from the Antarctic biome, a human introduction of Gondwanan ancestry?
FIGURE 4. Pseudingolfiella possessionis n. sp. A–G. Coxal plates 1−7, C showing coxal gill. H−J. Pleopods 1−3, female. K−M. Pleopods 1−3, male. N. Urosome, lateral view. O. Telson, male, dorsal view. P. Telson, female, dorsal view. Q. Mediodorsal projection of telson. Scale bars: A−Q: 50 µm.
FIGURE 2. Pseudingolfiella possessionis n in Description of Pseudingolfiella possessionis n. sp. (Crustacea, Amphipoda) from sub-Antarctic Île de La Possession, Crozet archipelago: the second freshwater amphipod known from the Antarctic biome, a human introduction of Gondwanan ancestry?
FIGURE 2. Pseudingolfiella possessionis n. sp. A. Female, habitus. B. Sternal gills. C. Antenna 1, female. D. Antenna 2, male. E. Accessory antenna, female. F. Accessory antenna, male. G. Labrum. H. Labium. I. Right mandible. J. Incisor and lacinia mobilis of left mandible. K. Incisor and lacinia mobilis of right mandible. Scale bars: A: 0.5 mm; C, D: 100 µm; B, E−K: 50 µm.
FIGURE 6. Pseudingolfiella possessionis n in Description of Pseudingolfiella possessionis n. sp. (Crustacea, Amphipoda) from sub-Antarctic Île de La Possession, Crozet archipelago: the second freshwater amphipod known from the Antarctic biome, a human introduction of Gondwanan ancestry?
FIGURE 6. Pseudingolfiella possessionis n. sp. SEM photographs. A. Habitus, male. B. Head and first thoracic segment, detail, male. C. Ventral view, showing sternal and coxal gills. D. Ibidem Fig. C, detail. E. Calceolus on antenna 2, medial view, male. F. Calceolus on antenna 2, posterior view, male. Scale bars: A: 0.25 mm; B−D: 0.1 mm; E, F: 10 µm.
FIGURE 1 in Description of Pseudingolfiella possessionis n. sp. (Crustacea, Amphipoda) from sub-Antarctic Île de La Possession, Crozet archipelago: the second freshwater amphipod known from the Antarctic biome, a human introduction of Gondwanan ancestry?
FIGURE 1. Post-Gondwanan distribution of Pseudingolfiella species. c. P. chilensis. m. P. morimotoi. s. P. soyeri. p. P. possessionis n. sp. (Map of the Southern Hemisphere showing the subdivision of the Antarctic biome, modified after Ochyra (1998)).
FIGURE 3. Pseudingolfiella possessionis n in Description of Pseudingolfiella possessionis n. sp. (Crustacea, Amphipoda) from sub-Antarctic Île de La Possession, Crozet archipelago: the second freshwater amphipod known from the Antarctic biome, a human introduction of Gondwanan ancestry?
FIGURE 3. Pseudingolfiella possessionis n. sp. A. Maxilla 1. B. Maxilla 2. C. Maxilliped, female. D. Maxilliped, male. E. Gnathopod 1, female. F. Gnathopod 2, female. Scale bars: A−D: 50 µm; E, F: 100 µm.
FIGURE 5. Pseudingolfiella possessionis n in Description of Pseudingolfiella possessionis n. sp. (Crustacea, Amphipoda) from sub-Antarctic Île de La Possession, Crozet archipelago: the second freshwater amphipod known from the Antarctic biome, a human introduction of Gondwanan ancestry?
FIGURE 5. Pseudingolfiella possessionis n. sp. A−E. Pereiopods 3−7. F. Dactylus of pereiopod 7. G. Uropod 1, female. H. Uropod 2, female. I. Uropod 1, male. J. Uropod 2, male. K. Uropod 3. Scale bars: A−E: 100 µm; F−K: 50 µm.
FIGURE 8. Pseudingolfiella possessionis n in Description of Pseudingolfiella possessionis n. sp. (Crustacea, Amphipoda) from sub-Antarctic Île de La Possession, Crozet archipelago: the second freshwater amphipod known from the Antarctic biome, a human introduction of Gondwanan ancestry?
FIGURE 8. Pseudingolfiella possessionis n. sp. SEM photographs. A. Urosome with uropods 1−3, female, ventral view. B. Telson, detail of spinulate mediodorsal projection. C. Telson, lateral view. D. Uropod 3. E. Knobbed micropores on ventrolateral body surface. F. Spiniferous field ventromedially at distal end of peduncle of uropods 3. Scale bars: A: 0.1 mm; B, F: 10 µm; C: 0.025 mm; D: 0.05 mm; E: 5 µm.
Supplementary material 5 from: Tichit P, Brickle P, Newton RJ, Convey P, Dawson W (2024) Introduced species infiltrate recent stages of succession after glacial retreat on sub-Antarctic South Georgia. NeoBiota 92: 85-110. https://doi.org/10.3897/neobiota.92.117226
Summary of effects of time since deglaciation for each glacier site on all variables modelled with Bayesian Inference (including quadratic and interaction terms if retained in the best model)
Supplementary material 10 from: Tichit P, Brickle P, Newton RJ, Convey P, Dawson W (2024) Introduced species infiltrate recent stages of succession after glacial retreat on sub-Antarctic South Georgia. NeoBiota 92: 85-110. https://doi.org/10.3897/neobiota.92.117226
Effect of time since deglaciation on the presence of plant and invertebrate species at tidewater and inland glacier sites modelled with Bayesian Inference
Supplementary material 1 from: Tichit P, Brickle P, Newton RJ, Convey P, Dawson W (2024) Introduced species infiltrate recent stages of succession after glacial retreat on sub-Antarctic South Georgia. NeoBiota 92: 85-110. https://doi.org/10.3897/neobiota.92.117226
Positions of all transects (black dots) along former deglaciation fronts (from 1993 to 2017, light to dark purple) in the vicinity of tidewater glaciers or in recent and old deglaciation areas in the vicinity of inland glaciers
Supplementary material 8 from: Tichit P, Brickle P, Newton RJ, Convey P, Dawson W (2024) Introduced species infiltrate recent stages of succession after glacial retreat on sub-Antarctic South Georgia. NeoBiota 92: 85-110. https://doi.org/10.3897/neobiota.92.117226
Average cover (in %) across transects of the 10 most common vascular plants around tidewater glaciers (a, n = 21 transects), inland glaciers (b, n = 18 transects)
Alkyl lipid distribution, elemental composition and compound-specific 14C isotope composition in marine and terrestrial sedimentary archives from sub-Antarctic South Georgia
<p>The dataset comprises elemental data, alkyl lipid data and radiocarbon (14C) data that was obtained on sediment samples from sub-Antarctic South Georgia. The sediments were collected from a range of different sites, including lakes, peat deposits, a marine inlet and a fjord during RV Polarstern expedition PS81 in 2013. More details on the study sites, sampling and data evaluation can be found in Berg et al. (submitted manuscript to JGR Biogeochemistry).</p>
Distribution. Originally native to the Indian Subcontinent and now introduced worldwide, including the sub-Antarctic Macquarie I but not Antarctica (modern introductions not shaded on the map). in Muridae
Distribution. Originally native to the Indian Subcontinent and now introduced worldwide, including the sub-Antarctic Macquarie I but not Antarctica (modern introductions not shaded on the map).
FIGURE 5 in A new genus and species of large-bodied caridean shrimp from the Crozet Islands, Southern Ocean (Crustacea, Decapoda, Lipkiidae) with a checklist of Antarctic and sub-Antarctic shrimps
FIGURE 5. Fresnerhynchus crozeti sp. nov., female holotype, Crozet Islands. A. Right mandible. B. Pars molaris of right mandible, frontal view. C. Right maxilla 1. D. Right maxilla 2. E. Right maxilliped 1. F. Right maxilliped 2. G. Right maxilliped 3.
FIGURE 1 in A new genus and species of large-bodied caridean shrimp from the Crozet Islands, Southern Ocean (Crustacea, Decapoda, Lipkiidae) with a checklist of Antarctic and sub-Antarctic shrimps
FIGURE 1. Phylogram showing the position of Fresnerhynchus crozeti within Nematocarcinoidea based on a concatenated dataset of three markers (12S, Enolase, Histone H3) with Lysmatidae as an outgroup. The topologies of the Maximum Likelihood and Bayesian inference 50% majority rule analyses are identical, significance values are bootstrap values / posterior probabilities. Family level designation follows Baeza et al. (2014).
FIGURE 4 in A new genus and species of large-bodied caridean shrimp from the Crozet Islands, Southern Ocean (Crustacea, Decapoda, Lipkiidae) with a checklist of Antarctic and sub-Antarctic shrimps
FIGURE 4. Fresnerhynchus crozeti sp. nov., female holotype, Crozet Islands. A. Right ocular peduncle, dorsal view. B. Ocelar beak (arrowed), orbital lower corner and proximal part of scaphocerite. C. Right peduncle of Antenna 1, lateral view. D. Right peduncle of Antenna 1, medial view. E. Right peduncle of Antenna 1, dorsal view. F. Right scaphocerite, dorsal view. G. Antenna 2, ventral view.
FIGURE 3 in A new genus and species of large-bodied caridean shrimp from the Crozet Islands, Southern Ocean (Crustacea, Decapoda, Lipkiidae) with a checklist of Antarctic and sub-Antarctic shrimps
FIGURE 3. Fresnerhynchus crozeti sp. nov., female holotype, Crozet Islands. A. Cephalothorax and pleonites 1–3 in dorsal view. B. Cephalothorax in lateral view. C. schematic representation of sternites of pereiopods 1–3. D. posterior half of pleon. E. Telson. F. Tip of telson.
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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.