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174 results for “fiddler crab”
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).
Fiddler crab and mollusk density in experimentally manipulated tidal creeks off the Rowley River, (Rowley and Ipswich, MA)
Climate change is predicted to shift or extend the range of warm-water species poleward. In 2014, the fiddler crab was observed for the first time at the PIE LTER site in Northeast Massachusetts, which is north of its historical range. Beginning in 2014, density estimates were collected.
Fiddler crab density in Plum Island Sound estuary, Rowley, Massachusetts
Climate change is predicted to shift or extend the range of warm-water species poleward. In 2014, the fiddler crab, Minuca (Uca) pugnax, was observed for the first time in PIE, which is north of its historical range. Beginning in 2014, density estimates were collected.
Fiddler crab impacts from observational study 2020-21: Aboveground & diatom biomass, plant height, percent N, burrow & mussel density, belowground biomass, and organic matter
The fiddler crab, Minuca pugnax, expanded its range into the Gulf of Maine recently and was first observed in the Plum Island Estuary in 2014. In 2020 and 2021, we investigated the impact of this burrowing crab on benthic microalgal biomass, sediment properties and the above- and belowground biomass of the cordgrass, Spartina alterniflora. To accomplish this, we conducted a control-impact study in plots with and without fiddler crabs in three marshes in the PIE-LTER: Sawyer, Clubhead, and Metcalf. In its historical range (i.e., south of Cape Cod), M. pugnax, enhances Spartina aboveground biomass. In contrast, we found that, on average, when fiddler crabs were present, aboveground biomass was 40% lower in the PIE-LTER. We also found that belowground biomass was 30% lower and benthic microalgal biomass was 45% lower when fiddler crabs were present, which is in line with our expectations. Because fiddler crabs reduced the biomass of foundational primary producers in its expanded range, our results imply that M. pugnax can influence other saltmarsh functions such as carbon storage and accretion as they expand north. More broadly, our results suggest that as species expand or shift their range with climate change, not only can they have profound impacts in their new ranges, but that those impacts can be the inverse of what is seen in their historical ranges.
Figure 2 in Population biology of the fiddler crab Uca maracoani (Crustacea, Ocypodidae) inhabiting an impacted mangrove area on the southern coast of São Paulo state, Brazil
Figure 2. Regression between carapace width and major cheliped propodus of males (A), and carapace width and abdomen width for females of Uca maracoani (B). In (A), light gray circles represent juveniles and black circles represent adults. In (B), light gray circles represent juvenile females, gray circles represent transitional phase, and black circles represent adult females.
Figure 3 in Population biology of the fiddler crab Uca maracoani (Crustacea, Ocypodidae) inhabiting an impacted mangrove area on the southern coast of São Paulo state, Brazil
Figure 3. Frequency of juveniles, adult males, and adult females of Uca maracoani by crab size and month.
Figure 1 in Population biology of the fiddler crab Uca maracoani (Crustacea, Ocypodidae) inhabiting an impacted mangrove area on the southern coast of São Paulo state, Brazil
Figure 1. Proportion of females (white bars) and males (black bars) of Uca maracoani by (A) Month and (B) Crab size (CW in mm).
Fig. 5 in Phylogeographic Structure within the Fiddler Crabs and (Brachyura, Ocypodidae) along the Tropical West Atlantic.
Fig. 5. Mismatch distribution for one Caribbean and nine Brazilian populations of Uca maracoani with 606 basepairs (A) and one Brazilian and one Caribbean population with 825 basepairs (B).
Fig. 2 in Phylogeographic Structure within the Fiddler Crabs and (Brachyura, Ocypodidae) along the Tropical West Atlantic.
Fig. 2. Haplotype network of Leptuca thayeri constructed with Popart, with a connection limit of 95%, derived from Cox1 mtDNA with 609 basepairs (A) and 826 basepairs (B). Black dots represent missing haplotypes (one-step edges); numbered 'H' indicate most common haplotypes.
Fig. 1 in Phylogeographic Structure within the Fiddler Crabs and (Brachyura, Ocypodidae) along the Tropical West Atlantic.
Fig. 1. Sample sites of Leptuca thayeri (black dots) and Uca maracoani (grey dots) populations from throughout the West Atlantic: Luperón & Sánchez from the Dominican Republic; Priory (St. Ann) from Jamaica; Marudá (Pará), Acuípe (Bahia), Bertioga (São Paulo) from Brazil. Grey squares correspond to localities sampled by Wieman et al. (2014), with sequences of U. maracoani in GenBank.
Fig. 4 in Phylogeographic Structure within the Fiddler Crabs and (Brachyura, Ocypodidae) along the Tropical West Atlantic.
Fig. 4. Mismatch distribution for two Caribbean and three Brazilian populations of Leptuca thayeri with 609 basepairs (A) and three Brazilian populations with 826 basepairs (B).
Fig. 3 in Phylogeographic Structure within the Fiddler Crabs and (Brachyura, Ocypodidae) along the Tropical West Atlantic.
Fig. 3. Haplotype network of Uca maracoani constructed with Popart, with a connection limit of 95%, derived from Cox1 mtDNA with 606 base pairs (A) and 825 base pairs (B). Black dots represent missing haplotypes (one-step edges), numbered 'H' indicate most common haplotypes.
Fig. 2 in The importance of considering small-scale variability in macrobenthic distribution: spatial segregation between two fiddler crab species (genus Leptuca) (Decapoda, Ocypodidae)
Fig. 2. NMDS ordination (stress = 0.16) of sites based on similarity of group composition. Leptuca leptodactyla (Rathbun in Rankin, 1898): JLM (juvenile males), JLF (juvenile females), ALM (adult males) and ALF (adult females). Leptuca uruguayensis (Nobili, 1901): JUM (juvenile males), JUF (juvenile females), AUM (adult males) and AUF (adult females).
Fig. 1 in The importance of considering small-scale variability in macrobenthic distribution: spatial segregation between two fiddler crab species (genus Leptuca) (Decapoda, Ocypodidae)
Fig. 1. Schematic representation of the sampling design, with subarea separation and the six random replicates. (Area=10 m²).
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.
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