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14 results for “Cornu aspersum”
Fig. 12 in Morphometry Of The Digestive Gland Of Terrestrial Mollusks Cornu Aspersum (Gastropoda, Helicidae)
Fig. 12. Digestive ducts of Cornu aspersum with different amounts of brown granules (Weigert's resorcinfuchsin): ducts with high (1) and low (2) brown granule content.
Fig. 9 in Morphometry Of The Digestive Gland Of Terrestrial Mollusks Cornu Aspersum (Gastropoda, Helicidae)
Fig. 9. Parallel rows of straight muscle bundles (arrows) in the parenchyma of digestive gland of Cornu aspersum (aldehyde-fuchsin after Gabe-Dyban).
Fig. 6 in Morphometry Of The Digestive Gland Of Terrestrial Mollusks Cornu Aspersum (Gastropoda, Helicidae)
Fig. 6. Structure of the digestive gland capsule of Cornu aspersum with two muscle bundle layers (Heidenhain's azan): internal muscle bundle layer (1), outer muscle bundle layer (2), collagen fibers layer (3), collagen fibers in muscle layer (4), epithelial layer (5), epithelial microciliae (6).
Fig. 4 in Morphometry Of The Digestive Gland Of Terrestrial Mollusks Cornu Aspersum (Gastropoda, Helicidae)
Fig. 4. Collagen fibers between digestive ducts of the digestive gland of Cornu aspersum (Heidenhain's azan): digestive duct (1), collagen fibers (2).
Fig. 2 in Morphometry Of The Digestive Gland Of Terrestrial Mollusks Cornu Aspersum (Gastropoda, Helicidae)
Fig. 2. Structure of the digestive gland of Cornu aspersum snail (haematoxylin-eosin): hemocoelical ducts (1), digestive ducts (2), stomach duct (3).
Fig. 5 in Morphometry Of The Digestive Gland Of Terrestrial Mollusks Cornu Aspersum (Gastropoda, Helicidae)
Fig. 5. Collagen fibers in the parenchyma of the digestive gland of Cornu aspersum (Heidenhain's azan): digestive duct (1), stomach duct (2), collagen fibers (3), supporting cells of haemocelical duct (4).
Fig. 11 in Morphometry Of The Digestive Gland Of Terrestrial Mollusks Cornu Aspersum (Gastropoda, Helicidae)
Fig. 11. Topography of vacuoles and brown granules in the digestive gland of Cornu aspersum (Potassium ferricyanide after Schmorl): Calcium cell (1), digestive cells (2), large brown granules (3), formation of large granules by small granules joining together (4).
Fig. 3 in Morphometry Of The Digestive Gland Of Terrestrial Mollusks Cornu Aspersum (Gastropoda, Helicidae)
Fig. 3. Structure of ducts of the digestive gland of Cornu aspersum (stained by haematoxylin-eosin): digestive cells (1), Calcium cells (2), vacuoles without brown granules (3), vacuoles with brown granules (4), duct lumen (5), inter-duct connective tissue (6), cells of inter-duct connective tissue (7).
Fig. 10 in Morphometry Of The Digestive Gland Of Terrestrial Mollusks Cornu Aspersum (Gastropoda, Helicidae)
Fig. 10. Vacuoles and granules in digestive ducts of Cornu aspersum (PAS reaction): Calcium cell (1), digestive cell (2), large brown granules (3), small granules joining into large granules (4).
Fig. 8 in Morphometry Of The Digestive Gland Of Terrestrial Mollusks Cornu Aspersum (Gastropoda, Helicidae)
Fig. 8. Muscle bundles in parenchyma of the digestive gland of Cornu aspersum (aldehyde-fuchsin after Gabe-Dyban): straight muscle bundles (1), horseshoe-shaped muscle bundles (2).
Fig. 1 in Morphometry Of The Digestive Gland Of Terrestrial Mollusks Cornu Aspersum (Gastropoda, Helicidae)
Fig. 1. Specimens of Cornu aspersum.
Data from: Functional connectivity in replicated urban landscapes in the land snail (Cornu aspersum)
Urban areas are highly fragmented and thereby exert strong constraints on individual dispersal. Despite this, some species manage to persist in urban areas, such as the garden snail, Cornu aspersum, which is common in cityscapes despite its low mobility. Using landscape genetic approaches, we combined study area replication and multi-scale analysis to determine how landscape composition, configuration, and connectivity influence snail dispersal across urban areas. At the overall landscape scale, areas with a high percentage of roads decreased genetic differentiation between populations. At the population scale, genetic differentiation was positively linked with building surface, the proportion of borders where wooded patches and roads appeared side-by-side and the proportion of borders combining wooded patches and other impervious areas. Analyses based on pairwise genetic distances validated the isolation-by-distance and isolation-by-resistance models for this land snail, with an equal fit to least-cost paths and circuit-theory-based models. Each of the 12 landscapes analyzed separately yielded specific relations to environmental features, whereas analyses integrating all replicates highlighted general common effects. Our results suggest that urban transport infrastructures facilitate passive snail dispersal. At a local scale, corresponding to active dispersal, unfavorable habitats (wooded and impervious areas) isolate populations. This work upholds the use of replicated landscapes to increase the generalizability of landscape genetics results, and shows how multi-scale analyses provide insight to scale-dependent processes.
Data from: Functional connectivity in replicated urban landscapes in the land snail (Cornu aspersum)
Open the record for dataset details and reuse information.
Fig. 7 in Morphometry Of The Digestive Gland Of Terrestrial Mollusks Cornu Aspersum (Gastropoda, Helicidae)
Fig. 7. Structure of the digestive gland's capsule of Cornu aspersum with one layer of muscle bundles (Heidenhain's azan): layer of muscle bundles (1), layer of collagen fibers (2), collagen fibers in the muscle layer (3), epithelial layer (4), epithelial microciliae (5).
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