Artykuły w czasopismach: „Fiddler crab”

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Malichatin, Nur, Husain Latuconsina i Hasan Zayadi. "Community structure of the Fiddler Crab (<i>Uca</i> spp.) at Bahak Indah Beach, Tongas, Probolinggo – East Java". Akuatikisle: Jurnal Akuakultur, Pesisir dan Pulau-Pulau Kecil 6, nr 2 (20.11.2022): 135. http://dx.doi.org/10.29239/j.akuatikisle.6.2.135-140.

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The fiddler crab (Uca spp.) is a type of animal belonging to the crustacean group that lives on the coast of Bahak Indah, Tongas, Probolinggo. The high level of anthropogenic activity on the beach of Bahak Indah makes the fiddler crab community increasingly depressed and its habitat decreasing. The purpose of this study was to compare the community structure of fiddler crabs at Bahak Beach, Tongas, Probolinggo. The study was conducted in January – February 2022. The determination of observation stations was purposive based on the consideration of the presence and absence of mangrove vegetation. Sampling of fiddler crabs used a systematic sampling method using transects and plots. Community structure data analysis includes diversity, uniformity, and dominance indices displayed in graphical form. Based on the results of the study found 4 types of fiddler crabs in Bahak Indah Beach, namely Uca cryptica, Uca perplexa, Uca coarctata, and Uca dussumieri. The value of diversity on the beach with mangrove habitat is in the medium category, while on the beach habitat without mangrove vegetation it is in the low category. The uniformity value obtained in mangrove habitats is in the high category, while in coastal habitats without mangrove vegetation it is found in the medium category. On the other hand, the dominance index value is in the low category in coastal habitats with mangrove vegetation, and the moderate category in coastal habitats without mangrove vegetation. The relationship between the Diversity (H') of the fiddler crab and the environmental conditions of the Bahak Indah Beach waters is that it has a positive correlation with water pH parameters with sufficient correlation and soil pH with a strong correlation. While the correlation with temperature parameters is strong but negative. Likewise, salinity is quite strong but negative.

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Ventura, Robson, Ubiratã A. T. da Silva, Kelly Cottens, Walter A. Boeger i Antonio Ostrensky. "Restocking Ucides cordatus (Decapoda: Ocypodidae): interespecific associations as a limiting factor to the survival of released recruits". Brazilian Journal of Oceanography 58, nr 3 (wrzesień 2010): 207–12. http://dx.doi.org/10.1590/s1679-87592010000300003.

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Simulations in the laboratory were used to investigate whether survivorship rates of Ucides cordatus youngsters produced in the laboratory are significantly affected by other crab species after their release in natural environments. Furthermore, it was investigated whether the release of first instar juveniles instead of megalopae would reduce the mortality related to interspecific predation. A preliminary estimate of the crab community structure in the target area of a restocking program was undertaken and indicated a great dominance of fiddler crabs (Uca spp). Based on this information, experiments were conducted to assess the ecological relationship between Ucides cordatus megalopae and first instar juveniles and fiddler crabs of different size classes in the presence of mangrove sediment, simulating natural conditions, as well as in the absence of any kind of refuge. It was observed that fiddler crabs not only compete with, and prey on U. cordatus youngsters, both as megalopae and juveniles. Furthermore, it was observed that the predation behavior of fiddler crabs is exercised only by individuals with carapaces wider than 0.5 cm. The results of the assay simulating natural conditions showed that, even when sediment was provided as a refuge, the same pattern was observed, with survivorship rates significantly lower in the presence of Uca crabs.

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Min, Wah Wah, Kathiresan Kandasamy i Balasubramaniyan Balakrishnan. "Crab Species-Specific Excavation and Architecture of Burrows in Restored Mangrove Habitat". Journal of Marine Science and Engineering 11, nr 2 (1.02.2023): 310. http://dx.doi.org/10.3390/jmse11020310.

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Burrowing crabs are considered to be ecosystem engineers, playing a vital role in mangrove ecosystems through bio-geochemical transformation. This process depends on the size and shape of burrows. The present study analyzes the architecture of burrows constructed by crabs in a restored mangrove habitat. Fourteen crab species were found to construct burrows of 13 different shapes, with a predominance of I-, J-, and L-shapes. Sesarmids were larger in size than fiddlers, and made burrows with wider openings mostly in the Rhizophora zone. Fiddlers constructed complex burrows with a vertical position, and made longer and deeper burrows in contrast to sesarmids, which formed simple burrows with a horizontal position, digging shorter and shallower burrows in Avicennia or open zones. The sesarmids had smaller burrows without branching in mangrove zones, whereas the fiddlers had larger burrows with or without branching in open and Avicennia zones. The burrows of fiddler crabs, especially Austruca occidentalis and A. annulipes, had separate openings and passages for exit and entry as an adaptation against predators. The present work identified Austruca occidentalis and A. annulipes as the most potent bioturbating crab species in restored mangrove habitats due to their efficiency in soil excavation and formation of large-sized burrows.

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Riswandi, Agung, Endang Yuli H i Mulyanto Mulyanto. "Study of Fiddler Crab (Uca sp.)Community in Mangrove Ecosystem of Mangrove Areas Curahsawo Probolinggo, East Java". Samakia : Jurnal Ilmu Perikanan 10, nr 1 (28.03.2019): 31–37. http://dx.doi.org/10.35316/jsapi.v10i1.234.

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Fiddler crab (Uca sp.)one of the crabs that inhabit the intertidal area, especially around the mangrove forest research was conducted in the mangrove areas Curahsawo, district of Gending, Probolinggo, East Java in April 2017. The aim of this study is to determine the structure community violin crabs in the mangrove areas Curahsawo Probolinggo. The measured parameters namely pH, soil organic matter and soil texture. Sampling point there are three stations, namely station 1 is mangrove area, station 2 is in the pond area, the station 3 is the estuary area. Results of measurement of environmental quality at the location of research is soil pH among 7.09 to 8.03, soil organic matter among 1.027% to 3.106%, and the type of soil is sandy clay and dusty clay. fiddler crabs are found in mangrove ecosystem Curahsawo there are 6 types of Uca rosea, Uca lactea, vocans Uca, Uca perplexa, dussumieri Uca, Uca demani. The highest density of crabs is Uca perplexa as much as 16 ind/m2, the lowest type of Uca demani 4 ind/m2. Value diversity fiddler crabs in mangrove ecosystem Sawo relatively standart is 1,56. The value of existing dominance is 0,96. Index violin crab distribution patterns in the Mangrove Ecosystem Munitions Sawo is uniform for Uca lactea, Uca vocans, Uca dussumieri , Uca demani and clumped to Uca rosea and Uca perplexa. The result of the spread of fiddler crab to the type of soil texture is very visible on the Uca perplexa since spread across all points of soil sampling with the number 6 ind/m2 to 16 ind/m2 in the texture of clay and sandy loam.

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Martin, Benjamin E. "Autotomy and running performance of fiddler crabs (Decapoda: Brachyura: Ocypodidae)". Journal of Crustacean Biology 39, nr 5 (8.07.2019): 613–16. http://dx.doi.org/10.1093/jcbiol/ruz049.

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Abstract The sexually dimorphic, enlarged major claw is a notorious trait among male fiddler crabs, but comes with potential locomotor costs. Possessing the ability to autotomize the enlarged claw is thus potentially advantageous to not only to escape a predator’s grip, but also to increase running performance. Previous studies concluded that autotomy either has no effect or even a negative effect on running performance. If the claw does not aid in locomotion, then shedding the enlarged claw that accounts for 40% of a fiddler crab’s mass should positively affect running performance. I therefore investigated autotomy and running performance in the Atlantic sand fiddler crab Leptuca pugilator (Bosc, 1801) with a focus on improving upon the methods of previous studies. Crabs were given substantial recovery time between collection, running trials, and autotomy induction. Maximum sprint speed was assessed by running crabs on a 1 m sand and mud track where individuals were significantly faster after autotomy of the enlarged claw (N = 64, t63=-7.25, P < 0.001). Intact running velocity was furthermore a significant predictor of autotomized running velocity (R2 = 0.194, P < 0.001). This study is the first to show a significant increase in fiddler crab sprint velocity after autotomy on a flat surface, and I propose where methodological pitfalls may have occurred in previous studies.

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Raposa, Kenneth B., Richard A. McKinney, Cathleen Wigand, Jeffrey W. Hollister, Cassie Lovall, Katelyn Szura, John A. Gurak, Jr., Jason McNamee, Christopher Raithel i Elizabeth B. Watson. "Top-down and bottom-up controls on southern New England salt marsh crab populations". PeerJ 6 (30.05.2018): e4876. http://dx.doi.org/10.7717/peerj.4876.

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Southern New England salt marsh vegetation and habitats are changing rapidly in response to sea-level rise. At the same time, fiddler crab (Uca spp.) distributions have expanded and purple marsh crab (Sesarma reticulatum) grazing on creekbank vegetation has increased. Sea-level rise and reduced predation pressure drive these changing crab populations but most studies focus on one species; there is a need for community-level assessments of impacts from multiple crab species. There is also a need to identify additional factors that can affect crab populations. We sampled crabs and environmental parameters in four Rhode Island salt marshes in 2014 and compiled existing data to quantify trends in crab abundance and multiple factors that potentially affect crabs. Crab communities were dominated by fiddler and green crabs (Carcinus maenas); S. reticulatum was much less abundant. Burrow sizes suggest that Uca is responsible for most burrows. On the marsh platform, burrows and Carcinus abundance were negatively correlated with elevation, soil moisture, and soil percent organic matter and positively correlated with soil bulk density. Uca abundance was negatively correlated with Spartina patens cover and height and positively correlated with Spartina alterniflora cover and soil shear strength. Creekbank burrow density increased dramatically between 1998 and 2016. During the same time, fishing effort and the abundance of birds that prey on crabs decreased, and water levels increased. Unlike in other southern New England marshes where recreational overfishing is hypothesized to drive increasing marsh crab abundance, we propose that changes in crab abundance were likely unrelated to recreational finfish over-harvest; instead, they better track sea-level rise and changing abundances of alternate predators, such as birds. We predict that marsh crab abundance will continue to expand with ongoing sea-level rise, at least until inundation thresholds for crab survival are exceeded.

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Takeda, Satoshi. "Burrowing-site selection by the soldier crab Mictyris guinotae Davie, Shih & Chan, 2010 (Decapoda: Brachyura: Mictyridae)". Journal of Crustacean Biology 40, nr 2 (27.02.2020): 147–51. http://dx.doi.org/10.1093/jcbiol/ruz097.

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Abstract The soldier crab Mictyris guinotae Davie, Shih & Chan, 2010 inhabiting sandy tidal flats in the Ryukyu Is., Japan, are deposit feeders in two regions: its upper habitat where it burrows and the shoreline. The crabs usually migrate between these two regions during the period of emergence at the daytime and night-time low tide. The aim of this study was to determine which kind of sediments are chosen by the crabs when burrowing. Experiments designed to investigate burrowing-site selection revealed that the crabs preferably burrowed in sediment that had been conditioned through feeding by conspecific crabs, but not in sediment that had been conditioned by conspecific crabs walking on its surface. Moreover, the crabs never showed any preference for burrowing in sediment that had been conditioned through feeding by the competitor fiddler crab Austruca perplexa (H. Milne Edwards, 1852); both soldier (prey) and fiddler (predator) crabs sympatrically inhabit the tidal flat, but segregate their habitats with a transition area. These results suggest that chemical cues in sediment conditioned through feeding by conspecific soldier crabs affect where crabs burrow.

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Ajizatunnisa, Ajizatunnisa, Sri Wahyuni, Lud Waluyo i Fuad Jaya Miharja. "Booklet development based on research identification of fiddler crab (Uca spp.) diversity in mangrove ecosystem". Jurnal Pendidikan Biologi Indonesia 4, nr 1 (28.03.2018): 61. http://dx.doi.org/10.22219/jpbi.v4i1.5337.

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The purpose of this development study is to develop research-based booklet for the identification of fiddler crab (Uca spp.) diversity. Some people do not yet know the ecological benefits of fiddler crabs. This is apparent when some people take fiddler crabs to serve as decorative crabs. The product specifications expected in the development of this medium are booklets. Therefore, it takes a companion learning media that can lead the local community to implement self-learning in the form of booklet because their interest of reading is very less, especially when reading a book that is colorless and has a lot of words. Booklet that is packed with interesting and accompanied by pictures is an alternative solution. The development method used in the research is Exploration, Explanation, and Evaluate (3E) model. The research was conducted by developing the research result into a booklet based on the diversity of fiddler crabs in mangrove ecosystem. The booklet validation consists of two lecturers from the Department of Biology Education at the University of Muhammadiyah Malang which is a material expert and learning media expert. The result of this research is booklet very valid with the percentage of material expert validity 81.25% and learning media expert 95.13%.

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Martínez-Soto, Kayla S., i David S. Johnson. "The density of the Atlantic marsh fiddler crab (Minuca pugnax, Smith, 1870) (Decapoda: Brachyura: Ocypodidae) in its expanded range in the Gulf of Maine, USA". Journal of Crustacean Biology 40, nr 5 (22.07.2020): 544–48. http://dx.doi.org/10.1093/jcbiol/ruaa049.

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Abstract The Atlantic marsh fiddler crab, Minuca pugnax (Smith, 1870), is a climate migrant that recently expanded its range northward into the Gulf of Maine. We tracked the M. pugnax population within the Great Marsh, in northeastern Massachusetts, USA, since it was first detected in 2014 using burrow counts. Because burrow counts can overestimate fiddler-crab density, we used camera traps to determine the relationship between burrow densities and fiddler-crab densities in 2019. The burrow count surveys show a six-fold increase in the density of M. pugnax in the Great Marsh from 2014 to 2019. Results indicates that the fiddler-crab population in the expanded range is established and growing. Based on burrow counts, however, the density of M. pugnax in the expanded range (6 burrows m–2) remains much lower than those found in the historical range (up to 300 burrows m–2). Based on the camera traps, we determined that burrow counts overestimated fiddler-crab densities by 47% in 2019. There was, on average, one crab detected for every two burrows observed. This result suggests that estimates of densities of M. pugnax based on burrow counts should be reduced by half. Minuca pugnax is an ecosystem engineer that can influence saltmarsh functioning and the magnitude of that influence is related to its density. Our results imply that the populations of M. pugnax in the expanded range are currently having minor impacts on marshes relative to larger populations in the historical range, but their impact will increase as the populations grow.

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Khan, Mst Mansura, i Mohammad Sadequr Rahman Khan. "Shore to landward transect burrow diversity of fiddler crab in a tropical intertidal coast of Chittagong in Bangladesh". Research in Agriculture Livestock and Fisheries 4, nr 2 (27.08.2017): 131–40. http://dx.doi.org/10.3329/ralf.v4i2.33725.

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Burrows indicate the abundance and distribution of fiddler crab in an intertidal coast that varies with structure and morphology within intertidal habitats. We observed fiddler crab burrow density and characters (burrow length, depth, diameter and volume) within randomly selected six 1m2 quadrate from three intertidal habitats: higher saltmarsh, mangrove pool (a small ditch distributed within mangrove) and mangrove land through field surveys in a coast of Chittagong, Bangladesh. Burrows were observed and counted for density estimation, and burrow characteristics were studied through excavating 10 representative burrows from each quadrate of each habitat. Spearman correlation was used to relate between the distances (from shore towards land) and burrow characters. Transect starting from saltmarsh as base towards mangrove land showed burrow density decreased from shore to higher intertidal habitat. Simultaneously, higher burrow length and diameter were observed landward and contrariwise shoreward. Burrow prevalence in mangrove pools represents fiddler crabs are abundant within land and shore interface presumably due to the dual privilege of easy burrowing and moist condition required for gill ventilation.Res. Agric., Livest. Fish.4(2): 131-140, August 2017

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Curran, M. C., i M. M. Mace III. "Differences in the Use of Cheliped Autotomy by the Mud Fiddler Crab Uca Pugnax (Smith, 1870) (Decapoda, Ocypodidae) When Escaping Predation by the Blue Crab Callinectes Sapidus (Rathbun, 1896)". Crustaceana 84, nr 11 (2011): 1281–93. http://dx.doi.org/10.1163/156854011x594795.

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AbstractAutotomy of limbs has been observed for a variety of organisms and in some taxa has been shown to be an effective strategy for escaping predation. We investigated differences in the use of cheliped autotomy by small and large male fiddler crabs during predation events, and also assessed if autotomy of the major cheliped allowed male fiddler crabs to escape predation more often than females. The blue crab Callinectes sapidus was presented with 5 small and 5 large male mud fiddler crabs Uca pugnax (n = 60), and in a second experiment, 5 male and 5 female U. pugnax were presented to C. sapidus (n = 60). Large U. pugnax autotomized their major cheliped more often and survived compared to small U. pugnax (n = 22 pools, S = 96.5, p < 0.0001), although this difference was not significant when adjusted for the total number of attacks on each size (n = 22 pools, S = 45, p = 0.1467). There was no significant difference (n = 29 pools, S = 30.5, p = 0.4988) between the total number of unsuccessful attacks on male versus female U. pugnax. At least half of the males autotomized their major cheliped in unsuccessful attacks during the first (69%) and second (53%) experiments. The major cheliped of male U. pugnax is a prominent visual stimulus that may have initially attracted C. sapidus to this prey; however, autotomization potentially enabled male fiddler crabs to escape predation in over half of all unsuccessful attacks.

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Ribeiro, Pablo D., Oscar O. Iribarne, Luciano Jaureguy, Diego Navarro i Eugenia Bogazzi. "Variable sex-specific mortality due to shorebird predation on a fiddler crab". Canadian Journal of Zoology 81, nr 7 (1.07.2003): 1209–21. http://dx.doi.org/10.1139/z03-102.

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Male fiddler crabs compete for access to mates mainly by displaying an enlarged claw. One cost of this large claw is presumed to be higher exposure to predators. The fiddler crab Uca uruguayensis is used as a food source by several Neotropical migratory shorebirds. We investigated whether crab density and male claw-waving behaviour increase predation by shorebirds. The sex ratio of crabs on the surface was strongly male biased. Male crabs showed a daily succession of feedingwavingfeeding activities and their dry mass at the site decreased with a high density of crabs, suggesting stronger malemale competition than at sites with a low density of crabs. Sex-specific predation varied according to shorebird species. The Ruddy Turnstone (Arenaria interpres) preyed intensively on male crabs when they were courting and at sites with a high density of crabs, the Black-bellied Plover (Pluvialis squatarola) and the Lesser Golden Plover (Pluvialis dominica) preyed on crabs of both sexes, and the Whimbrel (Numenius phaeopus) foraged intensively on females. When estimating the net effect of all predators, we found that the four shorebird species together were able to consume between 0.1 and 0.2% of the crab population, and consumption did not differ between the sexes of crabs. These mortality rates indicate a low source of mortality, likely unable to produce deviations in the sex ratio of the population. Thus, our results indicate that a trait thought to be sexually selected does not necessarily lead to a disproportionate increase in mortality due to predation.

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Weese, David A., Denson K. Mclain, Ann E. Pratt i Quentin Q. Fang. "Population structure of the Atlantic sand fiddler crab Uca pugilator along the eastern coast of US revealed by molecular data". Current Zoology 55, nr 2 (1.04.2009): 150–57. http://dx.doi.org/10.1093/czoolo/55.2.150.

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Abstract The Atlantic sand fiddler crab Uca pugilator is an extremely abundant crab found along the eastern coast of the United States. Fiddler crabs have a life cycle with an obligatory planktonic larval phase of 30 - 90 days, which might be expected to lead to widespread larval dispersal and consequent genetic homogeneity over considerable distances. However, a large amount of morphological and behavioral variation is found between northern and southern populations along the eastern coast. This study was undertaken to determine the population genetic structure of U. pugilator and to determine whether these differences may have a genetic basis. The population structure of the fiddler crab was analyzed using 472 individuals collected from 12 sites along the eastern coast. PCR-based single stand conformation polymorphism (SSCP) was used to investigate between-site variation in the mitochondrial 16S rRNA gene of these individuals. Analysis of genetic variation indicated frequent gene flow between nearby localities' but much reduced levels between populations separated by larger geographic distances. Thus, despite the potential for high dispersal by planktonic larvae, population differentiation and isolation by distance is evident between northern and southern populations of U. pugilator. A high amount of genetic differentiation (FST = 0.3468) was found between northern and southern regions suggesting that the morphological and behavioral differences between these two regions have a genetic basis and may represent subspecies.

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Huang, Katherine, Bernard P. Boudreau i Daniel C. Reed. "Simulated fiddler-crab sediment mixing". Journal of Marine Research 65, nr 4 (1.07.2007): 491–522. http://dx.doi.org/10.1357/002224007782689120.

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Perez, D. M., S. J. Heatwole, L. J. Morrell i P. R. Y. Backwell. "Handedness in fiddler crab fights". Animal Behaviour 110 (grudzień 2015): 99–104. http://dx.doi.org/10.1016/j.anbehav.2015.09.012.

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Clark, H. L., i P. R. Y. Backwell. "Territorial battles between fiddler crab species". Royal Society Open Science 4, nr 1 (styczeń 2017): 160621. http://dx.doi.org/10.1098/rsos.160621.

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Many species worldwide are impacted by habitat loss. This may result in increased competition both within species and between species. Many studies have demonstrated that when two previously non-overlapping species are forced to compete over a resource, one species is likely to become dominant over the other. This study explores the impact a larger species of fiddler crab ( Tabuca elegans —previously known as Uca elegans ) has when invading an area previously used solely by a smaller species ( Austruca mjoebergi —previously known as Uca mjoebergi ). Here we show that, while there are some detrimental effects of living next to a heterospecific, they are relatively minor. New heterospecific neighbours fight more regularly with resident crabs, but each fight is no longer or more escalated than those between the resident and a new conspecific male. The residents are not specifically targeted by intruding heterospecifics, thus, given the large advantage of having a heterospecific neighbour in terms of lowered competition for females, the overall impact of species mixing is probably not as negative as might have been predicted.

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Tina, Fahmida Wazed, Mullica Jaroensutasinee, Krisanadej Jaroensutasinee i Anantanit Chumsri. "Do mudballs around burrows affect burrow characteristics of the fiddler crab Austruca annulipes (H. Milne Edwards, 1837) (Brachyura, Ocypodidae)?" Crustaceana 91, nr 4 (2018): 489–500. http://dx.doi.org/10.1163/15685403-00003779.

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We examined the effects of mudballs around burrows and of sex on burrow characteristics (shape, diameter, length, depth and volume) in an underground mating fiddler crab species,Austruca annulipes(H. Milne Edwards, 1837). We investigated 35 burrows with mudballs (males: 20; females: 15) and 34 burrows without mudballs (males: 16; females: 18), and measured their burrow characteristics. Results showed that burrow characteristics did not differ between burrows with and without mudballs. Males built larger-sized burrows with greater volumes, and had more mudballs than females. Crabs built J-, I-, L-, S- and U-shaped burrows, with higher numbers of J-shaped burrows in males, and higher numbers of I-shaped burrows in females. J-shaped burrows were larger with greater volumes, and had more mudballs than I-shaped burrows. For burrows with mudballs, mudball numbers were positively associated with burrow characteristics. This indicates that fiddler crab burrow characteristics are affected by sex, not by the production and presence of mudballs.

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Keeratipattarakarn, Kanitta, Fahmida Wazed Tina, Rattapon Sangngam, Ketsanee Thongsri i Arreeya Suphap. "‘Photography’ as a useful method for estimating the density, sex-ratio and body size of the surface-active Austruca perplexa (H. Milne Edwards, 1852) (Brachyura, Ocypodidae)". Crustaceana 94, nr 11-12 (15.12.2021): 1429–40. http://dx.doi.org/10.1163/15685403-bja10164.

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Abstract Estimations of crab density, sex-ratio, and body sizes are difficult. Though the ‘burrow excavation’ method is widely used to estimate these parameters in surface-active crabs, it is destructive to crab populations. Therefore, an alternative, non-destructive method is desirable. This study compared the non-destructive ‘photography’ method with the ‘burrow excavation’ method in a fiddler crab (Austruca perplexa (H. Milne Edwards, 1852)) population. Twenty 0.25 m2 quadrats were set out and 4 photos were taken of the surface-active crabs in each quadrat. All crab burrows were then excavated, and the crabs were collected to estimate their numbers, sexes, and body and claw sizes. Afterward, the photographs were analysed to estimate the same parameters by using the GIMP program. These parameters were then compared between the two methods. The results showed that these parameters were not different between the methods compared. This study thus reveals that the ‘photography’ method could safely be used instead of the ‘burrow excavation’ method, and yield the same results.

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Burton, Adrian. "Confessions of an ambidextrous fiddler crab". Frontiers in Ecology and the Environment 13, nr 4 (maj 2015): 232. http://dx.doi.org/10.1890/1540-9295-13.4.232.

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Clark, H. L., i P. R. Y. Backwell. "Assortative mating in a fiddler crab". Behaviour 153, nr 2 (2016): 175–85. http://dx.doi.org/10.1163/1568539x-00003333.

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Non-random mating, particularly positive size-assortative mating, is common and can have major evolutionary consequences. The causes of size-assortative mating, however, are rarely examined. Here we explore the possibility of sexual selection, mate availability and mating constraints causing the strong correlation between male and female sizes in the fiddler crabUca mjoebergi. We show that the full size range of males is available to females throughout the mating period, so mate availability is unlikely to cause size-assortative mating in this species. We also show that mechanical constraints do not prevent females from entering the burrows or mating with the full size range of males. We suggest that the strong size assortative mating that we observed throughout the mating cycle is driven by sexual selection. Both males and females prefer large partners. The benefit to mating with large partners needs further investigation.

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Backwell, Patricia R. Y., John H. Christy, Steven R. Telford, Michael D. Jennions i Jennions Passmore. "Dishonest signalling in a fiddler crab". Proceedings of the Royal Society of London. Series B: Biological Sciences 267, nr 1444 (7.04.2000): 719–24. http://dx.doi.org/10.1098/rspb.2000.1062.

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Ribeiro, Pablo D., Diego D. Navarro i Oscar O. Iribarne. "Patch use and departure rules by gull-billed tern Gelochelidon nilotica". Behaviour 158, nr 11 (12.07.2021): 985–1006. http://dx.doi.org/10.1163/1568539x-bja10105.

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Abstract The gull-billed tern Gelochelidon nilotica feeds on the fiddler crab Leptuca uruguayensis, which settles forming patches in south-eastern temperate mudflats of Argentina. Through field observations, we evaluated whether gull-billed terns used patches following the marginal value theorem (MVT). Gull-billed tern residence time in a patch was not related to crab density or travel times. The number of captures was also unrelated to crab density. Most of the times (44.6%) terns captured only one crab from each patch, and 35% of the times they left without a capture. However, crab density was lower when terns left the patches than when they arrived. This suggests that following several capture attempts by terns, crabs hide, producing a temporary decrease in their availability, forcing tern departure from the patches, which are no longer profitable. Thus, when prey availability is affected more by predator activity than by consumption, the MVT may not necessarily apply.

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Darwati, Herlina, Erianto Erianto i Berto Darmawan. "KEANEKARAGAMAN JENIS KEPITING BIOLA ( Uca spp. ) PADA EKOSISTEM HUTAN MANGROVE DI DESA PARIT SETIA KECAMATAN JAWAI KABUPATEN SAMBAS". JURNAL HUTAN LESTARI 10, nr 4 (14.12.2022): 891. http://dx.doi.org/10.26418/jhl.v10i4.54649.

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Fiddler crab has a unique character, there is sexual dimorphism in the size of its claws. This type of crab lives in tidal areas, around mangrove forests and sandy beaches. Mangrove forest is a unique type of ecosystem with lots of flora and fauna. The purpose of this study was to examine the diversity of types of Viola Crab (Uca spp) in the Mangrove Forest Ecosystem in Parit Setia Village, Jawai District, Sambas Regency. This research was conducted using a survey method with a purposive sampling technique. Samples were collected from 3 research lines, namely the front is close to the lowest tide limit where vegetation and fiddler crabs are already present, the middle and the back are close to terrestrial vegetation. The research line parallel to the coastline began to find violin crabs. For each 500 meter research line, 10 plots were made with a size of 1 x 1 meter. The distance between plots is 50 meters and the distance between lanes is 300 meters. The results of this study found 5 species including: Uca forcipata, Uca acuta, Uca triangularis, Uca rosea and Uca tetragonon. The index value of diversity of fiddler crabs is 1.46 in the medium category. The similarity index values for the three research lines ranged from 88-100 in the very high category. The species abundance index value is 10.8 in the low category. The evenness index value is 0.31 in the low category. The dominance index value of 0.26 is in the low category, meaning that no species dominates.Keywords: Diversity, Fiddler Crab, MangroveAbstrakKepiting biola memiliki karakter yang unik, terdapat dimorfisme seksual pada ukuran capitnya. Jenis kepiting ini hidup di daerah pasang surut, sekitar hutan mangrove dan pantai berpasir. Hutan mangrove merupakan salah satu tipe ekosistem yang unik serta banyak terdapat flora dan faunanya. Tujuan penelitian ini untuk mengkaji keanekaragaman jenis Kepiting Biola (Uca spp) pada Ekosistem Hutan Mangrove di Desa Parit Setia Kecamatan Jawai Kabupaten Sambas. Penelitian ini dilakukan dengan metode survei dengan teknik purposive sampling. Sampel dikumpulkan dari 3 jalur penelitian, yaitu bagian depan dekat dengan laut batas pasang terendah yang sudah terdapat vegetasi dan kepiting biola, bagian tengah dan bagian belakang dekat dengan vegetasi darat. Jalur penelitian sejajar garis pantai mulai ditemukannya kepiting biola. Setiap jalur penelitian sepanjang 500 meter dibuat 10 plot dengan ukuran 1 x 1 meter. Jarak antar plot 50 meter dan jarak antar jalur adalah 300 meter. Hasil penelitian ini ditemukan 5 jenis antara lain : Uca forcipata, Uca acuta, Uca triangularis, Uca rosea dan Uca tetragonon. Nilai indeks keanekaragaman kepiting biola 1,46 kategori sedang. Nilai indeks kesamaan jenis pada ketiga jalur penelitian berkisar antara 88-100 kategori sangat tinggi. Nilai indeks kelimpahan jenis 10,8 kategori rendah. Nilai indeks kemerataan 0,31 kategori rendah. Nilai indeks dominansi 0,26 kategori rendah artinya tidak ada jenis yang mendominasi.Kata Kunci : Keanekaragaman, Kepiting Biola, Mangrove

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Magalhães, André Lincoln B., i Tânia M. Costa. "Escape of the fiddler crab Uca rapax (Smith, 1870) (Crustacea: Ocypodidae) in the state of Minas Gerais, Brazil". Lundiana: International Journal of Biodiversity 8, nr 1 (28.10.2007): 65–68. http://dx.doi.org/10.35699/2675-5327.2007.23180.

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A escape of the fiddler crab Uca rapax (Smith, 1870), in the state of Minas Gerais is reported for the first time. This record was made more than 200 km away from its original habitat, a mangrove area in the state of Rio de Janeiro. The species has been introduced in ponds in the study area, located in the largest ornamental pisciculture/aquaculture center of Brazil. Male individuals of U. rapax were observed engaged in territorial and courtship displays around their burrows. Despite this, there is no well-established population of the species in the area, due to the physiological dependence of the larvae on brackish water. Keywords: Escape of exotic organisms, Brazil, fiddler crab, Minas Gerais, Uca rapax.

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Simith, Darlan J. B., Karen Diele i Fernando A. Abrunhosa. "Influence of natural settlement cues on the metamorphosis of fiddler crab megalopae, Uca vocator (Decapoda: Ocypodidae)". Anais da Academia Brasileira de Ciências 82, nr 2 (czerwiec 2010): 313–21. http://dx.doi.org/10.1590/s0001-37652010000200007.

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Megalopae of many decapod crab species accelerate their development time to metamorphosis (TTM) when exposed to natural physical and/or chemical cues characteristic of the parental habitat. In the present study, the influence of natural settlement cues on the moulting rates and development TTM in megalopae of the fiddler crab Uca vocator was investigated. The effects of mud from different habitats (including well-preserved and degraded-polluted mangrove habitats) and conspecific adult 'odours' (seawater conditioned with crabs) on the induction of metamorphosis were compared with filtered pure seawater (control). 95 to 100% of the megalopae successfully metamorphosed to first juvenile crab stage in all treatments, including the control. However, the development TTM differed significantly among treatments. Settlement cues significantly shortened development, while moulting was delayed in their absence. The fact that megalopae responded to metamorphosis-stimulating cues originating from both adult and non-adult benthic habitats demonstrates that settlement in this species may occur in a wider range of habitats within the mangrove ecosystem, including impacted areas.

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26

Nomann, Benjamin E., i Steven C. Pennings. "Fiddler crab–vegetation interactions in hypersaline habitats". Journal of Experimental Marine Biology and Ecology 225, nr 1 (lipiec 1998): 53–68. http://dx.doi.org/10.1016/s0022-0981(97)00209-8.

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Milner, R. N. C., T. Detto, M. D. Jennions i P. R. Y. Backwell. "Hunting and predation in a fiddler crab". Journal of Ethology 28, nr 1 (11.04.2009): 171–73. http://dx.doi.org/10.1007/s10164-009-0156-x.

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Koga, Tsunenori, Patricia R. Y. Backwell, John H. Christy, Minoru Murai i Eiiti Kasuya. "Male-biased predation of a fiddler crab". Animal Behaviour 62, nr 2 (sierpień 2001): 201–7. http://dx.doi.org/10.1006/anbe.2001.1740.

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Zeil, Jochen, i Martin Hofmann. "Signals from ‘crabworld’: cuticular reflections in a fiddler crab colony". Journal of Experimental Biology 204, nr 14 (15.07.2001): 2561–69. http://dx.doi.org/10.1242/jeb.204.14.2561.

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SUMMARY Fiddler crabs inhabit intertidal sand- and mudflats, where they live in dense colonies and are active on the surface during low tide. They exhibit a rich behavioural repertoire, with frequent interactions between animals in the context of territorial and mating activities. Male fiddler crabs have one massively enlarged and conspicuously coloured claw, which they use in waving displays and in fights with other males. The crabs carry their eyes on long, vertically oriented stalks high above the body and, as a consequence, see the bodies of conspecifics in the ventral visual field, below the local visual horizon, and against the mudflat surface as background. We filmed events in a colony of Uca vomeris with a normal video camera and an ultraviolet-sensitive camera placed at the eye height of an average crab, approximately 2–3cm above ground. We also used a spectrographic imager and linear polarized filters to analyse the cues potentially available to the animals for detecting, monitoring and possibly identifying each other. Areas of high contrast in mudflat scenes include specular reflections on the wet cuticle of crabs that are horizontally polarised. Besides specular reflections, some parts of the cuticle generate high-contrast signals against the mudflat background, both at wavelengths between 400 and 700nm, and in the ultraviolet region between 300 and 400nm. Uca vomeris can be very colourful: the different parts of the large claw of the male are white, orange or red. The carapace colours of both males and females can range from a mottled yellowish green brown, to a brilliant light blue. White and blue colours contrast starkly with the mudflat background, especially in the ultraviolet wavelengths. Under stress, the blue and white colours can change within minutes to a duller and darker blue or to a dull white.

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Yamaguchi, Takao, i Yasuhisa Henmi. "Cheliped differentiation and sex ratio of the fiddler crab Uca arcuata". Crustacean Research 37 (2008): 74–79. http://dx.doi.org/10.18353/crustacea.37.0_74.

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Wong, RJ, MS Roy i JEK Byrnes. "Sediment selection: range-expanding fiddler crabs are better burrowers than their historic-range counterparts". Marine Ecology Progress Series 674 (16.09.2021): 163–71. http://dx.doi.org/10.3354/meps13811.

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Climate change plays a large role in driving species range shifts; however, the physical characteristics of an environment can also influence and alter species distributions. In New England salt marshes, the mud fiddler crab Minuca pugnax is expanding its range north of Cape Cod, MA, into the Gulf of Maine (GoM) due to warming waters. The burrowing lifestyle of M. pugnax means sediment compaction in salt marshes may influence the ability of crabs to dig, with more compact soils being resistant to burrowing. Previous studies indicate that salt marshes along the GoM have a higher sediment compaction relative to marshes south of Cape Cod. Physical characteristics of this habitat may be influencing the burrowing performance of M. pugnax and therefore the continuation of their northward range expansion into the GoM. We conducted a controlled laboratory experiment to determine if compaction affects the burrowing activity of M. pugnax in historical and range-expanded populations. We manipulated sediment compaction in standardized lab assays and measured crab burrowing performance with individuals collected from Nantucket (NAN, i.e. historical range) and the Plum Island Estuary (PIE, i.e. expanded range). We determined compaction negatively affected burrowing ability in crabs from both sites; however, crabs from PIE have a higher probability of burrowing in higher sediment compactions than NAN crabs. In addition, PIE crabs were more likely to burrow overall. We conclude that site level differences in compaction are likely altering burrowing behavior in the crab’s expanded-range territory by way of local adaptation or phenotypic plasticity.

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Vigh, David A., i Milton Fingerman. "Molt Staging in the Fiddler Crab Uca Pugilator". Journal of Crustacean Biology 5, nr 3 (1.07.1985): 386–96. http://dx.doi.org/10.2307/1547910.

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Wada, Keiji, i Izumi Murata. "CHIMNEY BUILDING IN THE FIDDLER CRAB UCA ARCUATA". Journal of Crustacean Biology 20, nr 3 (sierpień 2000): 505–9. http://dx.doi.org/10.1651/0278-0372(2000)020[0505:cbitfc]2.0.co;2.

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Detto, Tanya, i Patricia R. Y. Backwell. "Social Monogamy in a Fiddler Crab, Uca Capricornis". Journal of Crustacean Biology 29, nr 3 (1.01.2009): 283–89. http://dx.doi.org/10.1651/08-3126.1.

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Wada, Keiji, i Izumi Murata. "Chimney Building in the Fiddler Crab Uca Arcuata". Journal of Crustacean Biology 20, nr 3 (1.01.2000): 505–9. http://dx.doi.org/10.1163/20021975-99990066.

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Darnell, Michael Zachary, Kenna K. Fowler i Pablo Munguia. "Sex-specific thermal constraints on fiddler crab behavior". Behavioral Ecology 24, nr 4 (2013): 997–1003. http://dx.doi.org/10.1093/beheco/art006.

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Thurman, Carl C. "Locomotor Rhythms in the Fiddler Crab, Uca subcylindrica". Biological Rhythm Research 29, nr 2 (luty 1998): 179–96. http://dx.doi.org/10.1076/brhm.29.2.179.1448.

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How, Martin J., i Jan M. Hemmi. "Courtship herding in the fiddler crab Uca elegans". Journal of Comparative Physiology A 194, nr 12 (10.10.2008): 1053–61. http://dx.doi.org/10.1007/s00359-008-0376-5.

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Painting, Christina J., William Splinter, Sophia Callander, Tim Maricic, Marianne Peso i Patricia R. Y. Backwell. "Ladies First: Coerced Mating in a Fiddler Crab". PLOS ONE 11, nr 6 (15.06.2016): e0155707. http://dx.doi.org/10.1371/journal.pone.0155707.

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Ribeiro, Pablo D., i Oscar O. Iribarne. "Coupling between microphytobenthic biomass and fiddler crab feeding". Journal of Experimental Marine Biology and Ecology 407, nr 2 (październik 2011): 147–54. http://dx.doi.org/10.1016/j.jembe.2011.05.030.

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Johnson, David Samuel, Cynthia Crowley, Katherine Longmire, James Nelson, Bethany Williams i Serina Wittyngham. "The fiddler crab, Minuca pugnax , follows Bergmann's rule". Ecology and Evolution 9, nr 24 (grudzień 2019): 14489–97. http://dx.doi.org/10.1002/ece3.5883.

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Layne, J. E. "Retinal location is the key to identifying predators in fiddler crabs (Uca pugilator)." Journal of Experimental Biology 201, nr 15 (1.08.1998): 2253–61. http://dx.doi.org/10.1242/jeb.201.15.2253.

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Fiddler crabs (Uca pugilator Bosc; Crustacea, Decapoda) feed and court in open, flat spaces. Their visual system has several putative adaptations to their flat habitat, including the tendency to keep the vertical axis of their eyes perpendicular to the plane of the substratum. It is hypothesized that one of the functions of this behavior is to distinguish accurately predators from conspecifics by aligning the region of the eye sensitive to predators with the region in space in which predators occur. To test this hypothesis, a crab was placed in a glass dish, and a moving stimulus was presented between 20 degrees above and below eye level (horizontal). Stimuli below the crab's horizon hardly ever evoked escape responses, while identical stimuli above the horizon produced escape responses whose frequency varied with the angular size, not the absolute size, of the stimulus. Experiments with artificial horizons showed that it is the position of the stimulus relative to the eye that is important, rather than its position relative to external cues such as the visible horizon, the vertical light gradient or the gravitational horizon. It is concluded that a crab responds to stimuli according to their position relative to its retinal equator. This conclusion is discussed in light of the crabs' natural behavior with respect to supra-horizontal stimuli.

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43

Knotts, Eilea R. "Influences of individual phenotypic traits on the habitat preferences of the sand fiddler crab, Uca pugilator". Behaviour 154, nr 7-8 (2017): 741–64. http://dx.doi.org/10.1163/1568539x-00003442.

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Recognizing which phenotypic traits are predictors for habitat choice can have important implications for understanding population dynamics. This study determined whether body size, sex, activity level, or origin habitat affected the preference of the fiddler crab,Uca pugilator, in selecting either a marsh or open mudflat, two habitats differing in risk level and food availability. Combining field and laboratory experiments, this study indicated a significant difference in body size and activity level of crabs between habitats. Further investigation of phenotypic dependency on habitat preference resulted in interactions between origin habitat and carapace width and activity level. When split by origin habitat, habitat preference for the open mudflat was predicted by body size for crabs originating from the open mudflat and by activity level for the crabs originating from theSpartinamarsh. These results suggest that, forU. pugilator, body size plays a large role in the preference for exposed habitat.

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Smithers, Samuel P., Nicholas W. Roberts i Martin J. How. "Parallel processing of polarization and intensity information in fiddler crab vision". Science Advances 5, nr 8 (sierpień 2019): eaax3572. http://dx.doi.org/10.1126/sciadv.aax3572.

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Many crustaceans are sensitive to the polarization of light and use this information for object-based visually guided behaviors. For these tasks, it is unknown whether polarization and intensity information are integrated into a single-contrast channel, whereby polarization directly contributes to perceived intensity, or whether they are processed separately and in parallel. Using a novel type of visual display that allowed polarization and intensity properties of visual stimuli to be adjusted independently and simultaneously, we conducted behavioral experiments with fiddler crabs to test which of these two models of visual processing occurs. We found that, for a loom detection task, fiddler crabs process polarization and intensity information independently and in parallel. The crab’s response depended on whichever contrast was the most salient. By contributing independent measures of visual contrast, polarization and intensity provide a greater range of detectable contrast information for the receiver, increasing the chance of detecting a potential threat.

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Santos, L. C., C. E. R. D. Alencar, F. A. M. Freire i A. C. Luchiari. "Agonistic interactions in the male fiddler crab Uca leptodactyla Rathbun, 1898 at varying densities". Crustaceana 88, nr 6 (2015): 625–40. http://dx.doi.org/10.1163/15685403-00003443.

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In this study we tested the effect of population density on agonistic interactions in male Uca leptodactyla Rathbun, 1898. We recorded the crab’s behaviour in pairs or in groups of five animals composed of conspecifics and heterospecifics living in the same area (sympatric) and distinct areas (allopatric) of the mangrove forest. Allopatric conspecific crabs showed higher approaching and signalling than those in other conditions. The higher the crab density, the lower the interaction intensity between animals. Low-level agonistic signals were mainly displayed in high density (groups), while claw touch mainly occurred in pairs. Allopatric conspecifics showed the more intense agonistic interactions. Therefore, Uca seems to decrease energy investment in unnecessary fights against sympatric and conspecific crabs. Population density is a major factor driving agonistic behaviour mainly when conspecific animals are kept together. This may occur due to the increased competition for the same resources.

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46

Johnson, David Samuel. "Fiddler on the roof: a northern range extension for the marsh fiddler crab Uca pugnax". Journal of Crustacean Biology 34, nr 5 (10.09.2014): 671–73. http://dx.doi.org/10.1163/1937240x-00002268.

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47

QUACKENBUSH, L. SCOTT, i L. L. KEELEY. "Regulation of Vitellogenesis in the Fiddler Crab,Uca pugilator". Biological Bulletin 175, nr 3 (grudzień 1988): 321–31. http://dx.doi.org/10.2307/1541722.

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Grow, Adri K., Charles A. Schutte i Brian J. Roberts. "Fiddler crab burrowing increases salt marsh greenhouse gas emissions". Biogeochemistry 158, nr 1 (10.01.2022): 73–90. http://dx.doi.org/10.1007/s10533-021-00886-5.

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Yamaguchi, Takao. "DIMORPHISM OF CHELIPEDS IN THE FIDDLER CRAB, UCA ARCUATA". Crustaceana 74, nr 9 (2001): 913–23. http://dx.doi.org/10.1163/15685400152682665.

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Perez, Daniela M., i Patricia R. Y. Backwell. "Male spacing and female choice in a fiddler crab". Behavioral Ecology 30, nr 6 (27.08.2019): 1769–74. http://dx.doi.org/10.1093/beheco/arz147.

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Abstract The aggregation of courting males is widespread among animal taxa, yet we do not understand why males congregate and therefore intensify local competition for female attention. The most commonly invoked theoretical explanation is that females preferentially approach clustered males due to the many benefits they would gain, and clustered males would therefore have higher mating success. However, although theoretical explanations of aggregation formation are well advanced, empirical studies are scarce, especially in invertebrates. In fact, there is little evidence that females do prefer to approach clustered displayers over spaced displayers. Here we address this question by using robotic crabs to test female preferences in fiddler crabs (a visually displaying species) and show that females do not preferentially approach clustered males. We suggest that if this pattern is more widespread, the most commonly invoked explanation of courting aggregations is of limited use. We offer explanations for the strong clustering behavior we observe in this species and discuss the implications of this finding for the theoretical underpinnings of this research field.

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