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118 results for “freshwater amphipods”
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.
FIGURE 2 in A new family, genus and species of freshwater amphipod Australomicroprotopus megacoxa gen. nov. sp. nov. (Senticaudata, Corophiidea, Microprotopoidea, Australomicroprotopidae fam. nov.) from Australia
FIGURE 2. Australomicroprotopus megacoxa gen. nov. sp. nov., male paratype Victoria, Maribyrnong River.
FIGURE 1 in A new family, genus and species of freshwater amphipod Australomicroprotopus megacoxa gen. nov. sp. nov. (Senticaudata, Corophiidea, Microprotopoidea, Australomicroprotopidae fam. nov.) from Australia
FIGURE 1. Australomicroprotopus megacoxa gen. nov. sp. nov., male holotype, Victoria, Maribyrnong River.
FIGURE 3 in A new family, genus and species of freshwater amphipod Australomicroprotopus megacoxa gen. nov. sp. nov. (Senticaudata, Corophiidea, Microprotopoidea, Australomicroprotopidae fam. nov.) from Australia
FIGURE 3. Australomicroprotopus megacoxa gen. nov. sp. nov., male and female paratypes Victoria, Maribyrnong River.
Reduced genetic diversity of freshwater amphipods in rivers with increased levels of anthropogenic organic micropollutants
<p><span>Anthropogenic chemicals in freshwater environments contribute majorly to ecosystem degradation and biodiversity decline. In particular</span><span>,</span><span> anthropogenic organic micropollutants (AOM), a diverse group of compounds including pesticides, pharmaceuticals, and industrial chemicals, can significantly impact freshwater organisms. AOM were found to impact </span><span>the </span><span>genetic diversity of freshwater species, however, </span><span>the</span><span> degree </span><span>to which </span><span>AOM cause changes in population genetic structure and allelic richness of freshwater macroinvertebrates remains poorly understood. Here, the </span><span>impact</span><span> of AOM </span><span>on</span> <span>the </span><span>genetic diversity of </span><span>the common</span> <span>a</span><span>mphipod</span> <span><em>Gammarus pulex</em> </span><span>(Linnaeus, 1758)</span><span> (clade E)</span> <span>was investigated </span><span>on a</span><span> regional</span> <span>scale.</span> <span>The site-specific AOM levels and their toxic potentials were determined in water and <em>G. pulex </em>tissue</span><span> sample</span><span> extracts</span><span> for 34 sites along six rivers impacted by wastewater effluents and agricultural run-off</span> <span>in central Germany. Population genetic param</span><span>e</span><span>t</span><span>e</span><span>rs were determined for <em>G. pulex</em> from the sampling sites by genotyping 16 microsatellite</span><span> loci</span><span>.</span> <span>Genetic differentiation among <em>G. pulex</em> from the </span><span>studied rivers</span><span> was</span><span> strongly</span> <span>associated </span><span>with</span> <span>geographic distance </span><span>between sites, but also </span>with <span>difference</span><span>s in</span> <span>site-specific </span><span>concentrations </span><span>of AOM. </span><span>T</span><span>h</span>us,<span> genetic diversity parameters </span><span>of</span> <em><span>G. pulex</span></em><span> were found to be </span><span>related to</span> <span>site-specific AOM levels</span><span>; </span>a<span>llelic richness was significantly </span><span>negatively correlated to levels of AOM</span><span> in <em>G. pulex</em> tissue (p < 0.003) and was reduced by up to 22% at sites with increased levels of AOM</span>. This was seen<span> despite </span><span>a </span><span>positive relationship </span>between<span> allelic richness </span><span>and</span><span> the presence of waste-water effluent. </span><span>In addition</span><span>, the inbreeding coefficient </span><span>of </span><em><span>G. pulex</span></em><span> from sites with toxic AOM levels was up to 2.5 times higher than in <em>G. pulex</em> from more pristine sites.</span><span> These results indicate that </span><span>AOM</span><span> levels commonly found in European rivers </span><span>significantly </span><span>contribute to changes in the genetic diversity of an ecologically relevant indicator species.</span></p>
FIGURE 10. Morphological differences between Hyalella luciae n in Hyalella luciae (Crustacea, Amphipoda, Hyalellidae)-a new species of freshwater amphipod from Southern Brazil
FIGURE 10. Morphological differences between Hyalella luciae n. sp. Limberger, Santos and Castiglioni and others Hyalella species from nearby areas in state of Rio Grande do Sul, southern Brazil. Hyalella georginae and Hyalella gauchensis (Streck et al. 2017), Hyalella palmeirensis (Streck-Marx & Castiglioni 2020) and Hyalella longipropodus (Limberger et al. 2021). Scale bars: 0.2 mm. G1 = gnathopod 1; G2 gnathopod 2.
FIGURE 9 in Hyalella luciae (Crustacea, Amphipoda, Hyalellidae)-a new species of freshwater amphipod from Southern Brazil
FIGURE 9. Morphological differences of uropod 3 and telson between Hyalella luciae n. sp. Limberger, Santos and Castiglioni and others Hyalella species from nearby areas in state of Rio Grande do Sul, southern Brazil. Hyalella georginae and Hyalella gauchensis (Streck et al. 2017), Hyalella palmeirensis (Streck-Marx & Castiglioni 2020) and Hyalella longipropodus (Limberger et al. 2021). Scale bars: 0.2 mm.
FIGURE 8 in Hyalella luciae (Crustacea, Amphipoda, Hyalellidae)-a new species of freshwater amphipod from Southern Brazil
FIGURE 8. Morphological differences of uropod 1 and uropod 2 between Hyalella luciae n. sp. Limberger, Santos and Castiglioni and others Hyalella species from nearby areas in state of Rio Grande do Sul, southern Brazil. Hyalella georginae and Hyalella gauchensis (Streck et al. 2017), Hyalella palmeirensis (Streck-Marx & Castiglioni 2020) and Hyalella longipropodus (Limberger et al. 2021). Scale bars: 0.2 mm.
FIGURE 6. Hyalella luciae n in Hyalella luciae (Crustacea, Amphipoda, Hyalellidae)-a new species of freshwater amphipod from Southern Brazil
FIGURE 6. Hyalella luciae n. sp. Limberger, Santos and Castiglioni. Male paratype. (A) uropod 1; (B) uropod 2; (C) uropod 3; (D) telson; (E) pleopod. Scale bars: 0.2 mm.
FIGURE 4. Hyalella luciae n in Hyalella luciae (Crustacea, Amphipoda, Hyalellidae)-a new species of freshwater amphipod from Southern Brazil
FIGURE 4. Hyalella luciae n. sp. Limberger, Santos and Castiglioni. Male paratype. (A) gnathopod 1; (A1) gnathopod 1 propodus and dactylus; (B) gnathopod 2. Scale bars: 0.2 mm.
FIGURE 5. Hyalella luciae n in Hyalella luciae (Crustacea, Amphipoda, Hyalellidae)-a new species of freshwater amphipod from Southern Brazil
FIGURE 5. Hyalella luciae n. sp. Limberger, Santos and Castiglioni. Male paratype. (A) pereiopod 3; (B) pereiopod 4; (C) pereiopod 5; (D) pereiopod 6; (E) pereiopod 7. Scale bars: 0.2 mm.
FIGURE 3. Hyalella luciae n in Hyalella luciae (Crustacea, Amphipoda, Hyalellidae)-a new species of freshwater amphipod from Southern Brazil
FIGURE 3. Hyalella luciae n. sp. Limberger, Santos and Castiglioni. Male paratype. (A) habitus from holotype; (B) antenna 1; (C) antenna 2; (D) left mandible; (D1) right mandible; (E) upper-lip; (F) Lower-lip; (G) maxilla 1; (H) maxilla 2; (I) maxilliped. Scale bars: 0.2 mm.
FIGURE 1. Hyalella luciae n in Hyalella luciae (Crustacea, Amphipoda, Hyalellidae)-a new species of freshwater amphipod from Southern Brazil
FIGURE 1. Hyalella luciae n. sp. Limberger, Santos and Castiglioni. Holotype male (A) and Allotype female (B). Scale bars: A= 0.80 mm; B= 0.75 mm.
FIGURE 2 in Hyalella luciae (Crustacea, Amphipoda, Hyalellidae)-a new species of freshwater amphipod from Southern Brazil
FIGURE 2. Type-locality of Hyalella luciae n. sp. Limberger, Santos and Castiglioni in municipality of São Pedro das Missões, state of Rio Grande do Sul, Southern Brazil. A= location of the spring in the rural property. B and C= spring where Hyalella luciae n. sp. was sampled.
FIGURE 7. Hyalella luciae n in Hyalella luciae (Crustacea, Amphipoda, Hyalellidae)-a new species of freshwater amphipod from Southern Brazil
FIGURE 7. Hyalella luciae n. sp. Limberger, Santos and Castiglioni. Female paratype. (A) gnathopod 1; (A1) gnathopod 1 propodus and dactylus; (B) gnathopod 2. Scale bars: 0.2 mm.
Figure 8 in Phylogenetic analyses of a new freshwater amphipod reveal polyphyly within the Holarctic family Crangonyctidae, with revision of the genus Synurella
Figure 8. Sicifera cahawba; holotype male, Old Cahawba Prairie, Dallas County, AL, USA (USNM 1660542), 6.38 mm. A, pleopod 1 (coupling spines and clothes-pin setae enlarged). B, pleopod 2 coupling spines. C, pleopod 3 coupling spines. D, epimera. E, uropod 1. F, uropod 2. G, uropod 3. H, telson. Scale bars: 1 mm.
Figure 3 in Phylogenetic analyses of a new freshwater amphipod reveal polyphyly within the Holarctic family Crangonyctidae, with revision of the genus Synurella
Figure 3. Habitus photographs of Sicifera cahawba. A, holotype, male (USNM 1660542), 6.38 mm, Old Cahawba Prairie, Dallas County, AL, USA. B, allotype, female (USNM 1660543), 8.27 mm, Old Cahawba Prairie, Dallas County, AL, USA. Scale bar: 1 mm.
Figure 6 in Phylogenetic analyses of a new freshwater amphipod reveal polyphyly within the Holarctic family Crangonyctidae, with revision of the genus Synurella
Figure 6. Sicifera cahawba; holotype male, Old Cahawba Prairie, Dallas County, AL (USNM 1660542), 6.38 mm. A, gnathopod 1 (palmar margin and dactylus enlarged). B, gnathopod 2 (palmar margin and dactylus enlarged). Scale bar: 1 mm.
ScienceDex guides
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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.