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55 results for “mud crab”
Rates of consumption of marsh periwinkles (Littoraria irrorata) by mud crabs (Eurytium limosum and Panopeus obesus) between August and December in a Georgia salt marsh
Predatory mud crabs (Panopeus obesus and Eurytium limosum) are two of the main resident infaunal predators in southeastern US salt marshes.The relative importance of the two species in the trophic control of marsh periwinkles (snails; Littoraria irrorata) is likley to change across seasons. We therefore manipulated the these predator species (Panopeus obesus and Eurytium limosum) in experimental cages in the field (at Dean Creek, Sapelo Island, GA) and assessed monthly predation rates over four months, between 15th August to 15th December. We included 3 treatments, consisting of two treatments containing each species alone, and one containing both species together; all treatments had the same density. Specifically, 1) 4 x Panopeus individuals; 2) 4 x Eurytium individuals; 3) 2 x Panopeus individuals + 2 Eurytium individuals. Only adult crabs (33-40mm carapace diameter) were used. We maintained the treatments over 4 months (15th Aug - 15th Dec 2009), replacing any missing crabs every two weeks and counting the number of snails killed by predators each month.
Effects of the relative abundance of predatory mud crabs (Panopeus obesus and Eurytium limosum) on abundances of snails and fiddler crabs in a Georgia salt marsh
Predatory mud crabs (Panopeus obesus and Eurytium limosum) are two of the main resident infaunal predators in southeastern US salt marshes. Little is known, however, about their effects on important prey species. These influences are llikely to be dependent on the identity and relative abundances of the two predator species. We therefore manipulated the relative abundances of Panopeus and Eurytium in experimental cages in the field (at Airport Marsh, Sapelo Island, GA). We maintained the treatments over 4 months (July - October 2011), before assessing impacts on predator limb loss (an indicator of interspecific antagonism) and prey densitities (small and large mud fiddler crabs and marsh periwinkles).
Fig. 4 in A review of the mud crab genus Pseudohelice Sakai, Türkay & Yang, 2006 (Crustacea: Brachyura: Varunidae), with redescription of Cyclograpsus latreillii H. Milne Edwards, 1837, from the western Indian Ocean
Fig. 4. The geographical distribution of Pseudohelice subquadrata (red dotted line) and P. latreillii (blue dotted line). The red solid circles are collection sites of specimens used in this study. The range was established by the additional records from references (see synonym lists for each species). The numbers correspond to the locality of specimens in Table 1. Empty triangles and circles mean the additional records from other references (see list of synonymies). "*" indicates the type locality.
Fig. 3 in A review of the mud crab genus Pseudohelice Sakai, Türkay & Yang, 2006 (Crustacea: Brachyura: Varunidae), with redescription of Cyclograpsus latreillii H. Milne Edwards, 1837, from the western Indian Ocean
Fig. 3. Pseudohelice latreillii (H. Milne Edwards, 1837). A–D, H–K, male (16.6 × 14.0 mm, neotype, MZUF 4991); F, L, female (17.3 × 14.2 mm, MZUF 4997); G, M, female (14.6 × 12.2 mm, MZUF 2935). A, dorsal view of male; B, ventral view of male; C, carapace; D, outer view of male left cheliped; E, left male infraorbital ridge; F, G, left female infraorbital ridge (F, form I; G, form II); H, J, dorsal view of right G1; I, K, ventral view of right G1; L, M, right vulva.
Fig. 5 in A review of the mud crab genus Pseudohelice Sakai, Türkay & Yang, 2006 (Crustacea: Brachyura: Varunidae), with redescription of Cyclograpsus latreillii H. Milne Edwards, 1837, from the western Indian Ocean
Fig. 5. Bayesian inference (BI) tree for Pseudohelice subquadrata and P. latreillii, and the outgroups, based on the cytochrome c oxidase subunit I (COI) gene. Probability values at the nodes represent support values for BI and maximum likelihood (ML). For haplotype names, see Table 1.
Fig. 2 in A review of the mud crab genus Pseudohelice Sakai, Türkay & Yang, 2006 (Crustacea: Brachyura: Varunidae), with redescription of Cyclograpsus latreillii H. Milne Edwards, 1837, from the western Indian Ocean
Fig. 2. Pseudohelice subquadrata (Dana, 1851), colour in life. A, dorsal view, male (15.6 × 13.1 mm, NCHUZOOL 16176, Dongsha I.); B, ventral view, male (15.6 × 13.1 mm, NCHUZOOL 16176, Dongsha I.); C, male (NCHUZOOL 16704, Dongsha I.); D, male (NCHUZOOL 16720, Dongsha I.); E, female (17.4 × 15.2 mm, NCHUZOOL 15727, Bali); F, male (18.0 × 14.7 mm, NCHUZOOL 16704, Dongsha I.); G, burrows of P. subquadrata (Hsinchu County: Sinfeng); H, habitat of P. subquadrata (Hsinchu County: Sinfeng).
Fig. 1 in A review of the mud crab genus Pseudohelice Sakai, Türkay & Yang, 2006 (Crustacea: Brachyura: Varunidae), with redescription of Cyclograpsus latreillii H. Milne Edwards, 1837, from the western Indian Ocean
Fig. 1. Pseudohelice subquadrata (Dana, 1851). A, B, E, G–J, male (19.2 × 17.1 mm, QM W19922); C, D, F, K, female (20.9 × 18.3 mm, QM W19922); A–D in preservative. A, dorsal view of male; B, ventral view of male; C, dorsal view of female; D, ventral view of female; E, left male infraorbital ridge; F, left female infraorbital ridge; G, I, dorsal view of left G1 (horizontally flipped); H, J, ventral view of left G1 (horizontally flipped for comparison with the right G1s of other specimens); K, right vulva.
Fig 1 in Culture of mud crab, Scylla serrata Forskal, 1775 with different feed formulations
Fig 1: Absolute growth (a), molting percentage (b) and survival rate (c) of mud crabs treated with different feed formulations. Same letter above parameter value indicates non-significant based on ANOVA 0.05%.
Fig. 4. A in Helice epicure, a new species of varunid mud crab (Brachyura, Decapoda, Grapsoidea) from the Ryukyus, Japan
Fig. 4. A Bayesian inference (BI) of species of the Helice/Chasmagnathus complex from Japan (including the Ryukyus), Korea, China, and Taiwan (including Penghu) based on cytochrome oxidase subunit I (COI) genes. Support values at the nodes represent the posterior probability for BI and the bootstrap values for maximum parsimony (MP).
Fig. 3 in Helice epicure, a new species of varunid mud crab (Brachyura, Decapoda, Grapsoidea) from the Ryukyus, Japan
Fig. 3. Helice epicure sp. nov. Holotype, male (25.3 × 30.7 mm) (RUMF-ZC-5009) (A-D), female (18.4 × 23.5 mm) (RUMF-ZC-5011) (E). (A) pleonal somites 3-6 and telson; (B) left G1, mesial view; (C) left G1, lateral view; (D) left G2, ventral view; (E) gonopore (= vulva). Scale bars: A = 5.0 mm, B-E = 1.0 mm.
Fig. 2 in Helice epicure, a new species of varunid mud crab (Brachyura, Decapoda, Grapsoidea) from the Ryukyus, Japan
Fig. 2. Left suborbital ridge of Helice epicure sp. nov. and H. formosensis Rathbun, 1931. (A) H. epicure sp. nov., holotype, male (25.3 × 30.7 mm) (RUMF-ZC-5009); (B) H. formosensis, male (27.0 × 31.4 mm) (NCHUZOOL).
Fig. 1 in Helice epicure, a new species of varunid mud crab (Brachyura, Decapoda, Grapsoidea) from the Ryukyus, Japan
Fig. 1. Helice epicure sp. nov. Paratype, male (26.4 × 30.1 mm) (RUMF-ZC-3069). (A) dorsal entire view; (B) cephalothorax, ventral view; (C) right chela, outer view.
FIGURE 5. 1-6 in Burrowing and mud-mound building life habits of fiddler crab Uca lactea in the Bay of Bengal coast, India and their geological and geotechnical importance
FIGURE 5. 1-6. Photographic illustrations arranged in order of gradual morphological transformation of simple (1) to compound mud-mounds (5-6) highlighting some possible morphological variants. Note greenish brown biomat coating on mud-mounds (1 and 5) that are microbially stabilized. The grey coloured mounds are yet to be stabilized.
FIGURE 4. 1 in Burrowing and mud-mound building life habits of fiddler crab Uca lactea in the Bay of Bengal coast, India and their geological and geotechnical importance
FIGURE 4. 1. Uca lactea burrow mouth with excavated loose sediment heaves or domes in relatively dry area. 2. Uca lactea mud chimney and surrounding substrate with mud clasts derived from collapsed mud-mounds and sorted out by tidal current, mud cracks and one trace producing crab (arrowed). 3. Ideal simple mud-mound of Uca lactea associated with feeding pellets arranged around burrow openings. 4. Network of Turritella spp. trails as observed after tidal wash out in low grounds. 5. Network of non-branching and radiating worm burrows (finer) in exposed and relatively dry mudflat. 6. Branching worm burrows (thicker) in exposed and relatively dry mudflat.
FIGURE 1. 1 in Burrowing and mud-mound building life habits of fiddler crab Uca lactea in the Bay of Bengal coast, India and their geological and geotechnical importance
FIGURE 1. 1. Regional geological setting of the Bengal Delta Complex with reference to down drift coastal plains incorporating large area covered by modern mangrove forest of Sundarbans, the Bay of Bengal Sea and Quaternary stratigraphy with time-successive palaeocoastlines (modified after Mallick et al., 1972). Note position of studied Bakkhali beach sector. 2. Magnified view of coastal beach sectors with location of study area (marked by red) by the side of a mighty estuary and position (*) of reported Uca marionis mud volcanoes (De, 2009). 3. A field excavation site from study area showing occurrence of soft mud layers below relatively dry and rigid sand layers with sharp contact as specific substrate condition.
FIGURE 2. 1. A in Burrowing and mud-mound building life habits of fiddler crab Uca lactea in the Bay of Bengal coast, India and their geological and geotechnical importance
FIGURE 2. 1. A field photograph of referred sample area for detailed study showing prolific growth of Uca lactea mudmounds on substrate having varied height, presence of mangrove bushes and spread of living Turritella spp. shells and distal creek. 2. Map prepared from sample study area shows distributions of simple mounds in high ground, compound mounds in low ground, Turritella spp. trails in low ground, mangrove bushes/plants and creek.
FIGURE 7 in Burrowing and mud-mound building life habits of fiddler crab Uca lactea in the Bay of Bengal coast, India and their geological and geotechnical importance
FIGURE 7. Schematic illustration of Uca lactea mud-mound building process as controlled by ground elevation and tidal recession. HTL stands for high tide level.
FIGURE 9 in Burrowing and mud-mound building life habits of fiddler crab Uca lactea in the Bay of Bengal coast, India and their geological and geotechnical importance
FIGURE 9. Vertical height variation curves of simple and compound mud-mounds (total 149 numbers) of Uca lactea in low and high grounds. Curve 1 - compound mounds (30 numbers with average height 14 cm) in low ground; Curve 2 - simple mounds (6 numbers with average height 11 cm) in low ground; Curve 3 - compound mounds (8 numbers with average height 7.5 cm) in high ground and Curve 4 - simple mounds (105 numbers with average height 4 cm) in high ground. Note shorter height of simple mounds relative to compound mounds irrespective of ground height and higher population of simple mounds in high ground and compound mounds in low ground.
FIGURE 8. 1-2 in Burrowing and mud-mound building life habits of fiddler crab Uca lactea in the Bay of Bengal coast, India and their geological and geotechnical importance
FIGURE 8. 1-2. Photographic illustrations of collapsed mounds (arrowed; circular to irregular depressions with central burrow opening(s) as observed immediately after high tide. 3. Rolled out mud balls, lumps and clasts derived from collapsed mud-mounds by tidal action.
FIGURE 6. 1. A in Burrowing and mud-mound building life habits of fiddler crab Uca lactea in the Bay of Bengal coast, India and their geological and geotechnical importance
FIGURE 6. 1. A cluster of predominantly simple mud-mounds produced in high ground. 2-4. Photographs showing field occurrences of predominantly simple mud-mounds in higher ground. 5-11. Photographs showing field occurrences of predominantly compound mud-mounds in low ground. Note greenish brown biomat coating on mud-mounds (6-9 and 11) as a part microbial stabilization process. 12. Photograph illustrating ground elevation-based distribution of simple and compound mounds. (Note size variations, population density variations, surficial features, substrate ruggedness, variation in substrate elevation and different morphotypes of mud-mounds as observed in natural populations.)
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Allen Brain Atlas
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OpenNeuro
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