Ocypodidae

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Hsi-te Shih - One of the best experts on this subject based on the ideXlab platform.

  • Uca (Xeruca), a new subgenus for the Taiwanese fiddler crab Uca formosensis Rathbun, 1921 (Crustacea: Decapoda: Ocypodidae), based on morphological and molecular evidence.
    Zootaxa, 2015
    Co-Authors: Hsi-te Shih
    Abstract:

    The fiddler crab Uca formosensis Rathbun, 1921 (Crustacea: Decapoda: Ocypodidae), restricted to the western part of Taiwan and the offshore Penghu (Pescadores) Islands in the Taiwan Strait, has been placed under the subgenus Uca (Gelasimus) Latreille, 1817 (= Uca (Thalassuca) Crane, 1975) based on only less than a dozen specimens, but later suggested under the subgenus Tubuca Bott, 1973 because the similarity of external morphology. A suite of characters of carapace, major cheliped, gastric mill, male first gonopod, and chela handedness, as well as the phylogenic relationships (mitochondrial 16S rDNA and cytochrome oxidase subunit I, and nuclear 28S rDNA), nevertheless support this species belongs to its own subgenus. A new subgenus Uca (Xeruca) subgen. nov. is herein established for U. formosensis.

  • Population genetics of the fiddler crab Uca sindensis (Alcock, 1900) (Crustacea: Brachyura: Ocypodidae) from the Arabian Sea
    Zoological Studies, 2015
    Co-Authors: Hsi-te Shih, Noor Us Saher, Ehsan Kamrani, Peter Kl Ng
    Abstract:

    Background The fiddler crab Uca sindensis (Alcock, 1900) (Crustacea: Brachyura: Ocypodidae) is distributed in the northern coasts of the Arabian Sea (Pakistan, Iran, Iraq, and Kuwait). Its typical habitat is on high intertidal areas with higher salinity, which might restrict its distribution, especially within the Persian Gulf. The purpose of the present phylogeographic study is to understand whether the Strait of Hormuz acts as a barrier to the gene flow of this species. Results The genetic analyses of the mitochondrial 16S rRNA, cytochrome oxidase subunit I (COI), and control region (CR) of specimens from various localities showed that there was no genetic differentiation between the populations inside and outside of the Persian Gulf. Conclusions We conclude that the narrow Strait of Hormuz does not form a barrier for the larval dispersal in this species. Its restricted distribution in the northern Arabian Sea may instead be associated with its preference for higher salinity sediments present in the coasts of this region.

  • A new species of fiddler crab from the Ogasawara (Bonin) Islands, Japan, separated from the widely-distributed sister species Uca (Paraleptuca) crassipes (White, 1847) (Crustacea: Decapoda: Brachyura: Ocypodidae).
    Zootaxa, 2013
    Co-Authors: Hsi-te Shih, Tomoyuki Komai, Min-yun Liu
    Abstract:

    A new species of fiddler crab (Brachyura: Ocypodidae), Uca boninensis sp. nov., is described from the Ogasawara (Bonin) Islands, Japan. The new species has previously been identified with the widely distributed U. crassipes (White, 1847), from which it differs by having a slightly differently shaped carapace, and relatively stouter male first gonopods (G1). The recognition of the new species is also supported by differences in the mitochondrial cytochrome oxidase I (COI) and control region (CR) genes. U. boninensis sp. nov., appears to be endemic to the Ogasawara Islands, and as the only known population is small, urgent conservation measures are needed for its protection. Our study brings the total number of the Japanese fiddler crab species to 12.

  • Morphology of Uca formosensis Rathbun, 1921 (Crustacea: Decapoda: Ocypodidae), an Endemic Fiddler Crab from Taiwan, with Notes on its Ecology
    Zoological Studies, 1999
    Co-Authors: Hsi-te Shih, Hin-kiu Mok, Hsueh-wen Chang, Sin-che Lee
    Abstract:

    Hsi-Te Shih, Hin-Kiu Mok, Hsueh-Wen Chang and Sin-Che Lee (1999) Morphology of Uca formosensis Rathbun, 1921 (Crustacea: Decapoda: Ocypodidae), an endemic fiddler crab from Taiwan, with notes on its ecology. Zoological Studies 38(2): 164-177. Uca formosensis Rathbun, 1921, is an endemic fiddler crab species from Taiwan. The taxonomy of this species has long been constrained by the paucity of study material. Crane (1975) placed U. formosensis as a member of the subgenus Thalassuca, but important characters, like its handedness, presence of enlarged teeth on the fingers of the female’s minor chela, structures of the anterolateral margin, suborbital margin, orbital floor, degree of arching of the carapace, and habitat preference, suggest that this classification is incorrect. It is suggested that U. formosensis should be excluded from the subgenus Thalassuca. In this study, a historic review is provided of the species and notes on its distribution, variation of morphology (chela types), live coloration, and taxonomy are included.

Shih Hsi-te - One of the best experts on this subject based on the ideXlab platform.

Marcio R. Pie - One of the best experts on this subject based on the ideXlab platform.

  • The Organization of the Mitochondrial Control Region in 2 Brachyuran Crustaceans: Ucides cordatus
    2015
    Co-Authors: Marcio R. Pie, Walter A. Boeger, Antonio Ostrensky, Jose ́ F. Oliveira-neto, A. Baggio
    Abstract:

    The control region (CR) is the largest noncoding segment of the mitochondrial DNA and includes the major regulatory elements for its replication and expression. In addition, the high level of intraspecific genetic variability found in the CR favors its use in phylogeographical and population genetic studies of a variety of organisms. However, most of the work on the structure of the CR has focused on vertebrates and insects, and little is known about the evolution of the CR in other taxa. In this study, we sequenced the entire CR of several individuals of 2 crab species: Ucides cordatus (Ocypodidae) and Cardisoma guanhumi (Gecarcinidae). There were neither large conserved regions in the CR of either species nor any similarity among species at the nucleotide level. However, the spatial pattern of genetic variability on the CR was similar among species. I

  • A Spatially Explicit Model of Synchronization in Fiddler Crab Waving Displays
    2012
    Co-Authors: Sabrina Borges, Lino Araujo, Ana C. Rorato, Daniela M. Perez, Marcio R. Pie
    Abstract:

    Fiddler crabs (Uca spp., Decapoda: Ocypodidae) are commonly found forming large aggregations in intertidal zones, where they perform rhythmic waving displays with their greatly enlarged claws. While performing these displays, fiddler crabs often synchronize their behavior with neighboring males, forming the only known synchronized visual courtship displays involving reflected light and moving body parts. Despite being one of the most conspicuous aspects of fiddler crab behavior, little is known about the mechanisms underlying synchronization of male displays. In this study we develop a spatially explicit model of fiddler crab waving displays using coupled logistic map equations. We explored two alternative models in which males either direct their attention at random angles or preferentially toward neighbors. Our results indicate that synchronization is possible over a fairly large region of parameter space. Moreover, our model was capable of generating local synchronization neighborhoods, as commonly observed in fiddler crabs under natural conditions

  • Genetic evidence for multiple paternity in the mangrove land crab Ucides cordatus (Decapoda: Ocypodidae)
    Marine Biology Research, 2011
    Co-Authors: Rafael A. Baggio, Maria W. Pil, Walter A. Boeger, Luciana Patella, Antonio Ostrensky, Marcio R. Pie
    Abstract:

    Abstract Studies on mating patterns of marine crustaceans are rare, but the few studies on brachyuran crabs to date suggest that polyandrous mating is uncommon. In the present study, we used 6 microsatellite loci to genotype 8–16 larvae obtained from each of 10 gravid females of the crab Ucides cordatus (Brachyura: Ocypodidae). Based on the number of non-maternal alleles detected among the offspring, at least 40% of the females were inseminated by more than one male. We suggest forced copulation and maintenance of sperm in spermathecae throughout the year as possible causes of polyandry in U. cordatus.

  • Specific primers for the detection of the black-yeast fungus associated with lethargic crab disease (LCD).
    Diseases of aquatic organisms, 2011
    Co-Authors: Marcio R. Pie, Walter A. Boeger, Luciana Patella, Vânia Aparecida Vicente, Raphael O. Ribeiro, Antonio Ostrensky
    Abstract:

    Lethargic crab disease (LCD) is an emerging infirmity that has been causing extensive mortalities in populations of the mangrove land crab Ucides cordatus (Ocypodidae) along the Atlantic coast of Brazil. Previous studies have indicated that LCD is associated with a dematiaceous fungus, Exophiala cancerae de Hoog et al. In the present study, we sequenced the internal transcribed spacer (ITS) of the rDNA region of this black yeast species and developed species-specific PCR primers. Sensitivity tests indicated that the developed protocol is capable of detecting very small amounts of target DNA. Also, the application of the protocol to a variety of other dematiaceous fungi did not generate any false positives. The specific primers provided in the present study represent an important tool for rapidly surveying a large number of crab individuals, as well as environmental samples. Such knowledge will be instrumental in understanding the epidemiological dynamics of LCD.

  • Modelling the lethargic crab disease.
    Journal of biological dynamics, 2009
    Co-Authors: Claudia Pio Ferreira, Walter A. Boeger, Marcio R. Pie, Lourdes Esteva, Paulo Fernando De Arruda Mancera, Antonio Ostrensky
    Abstract:

    The lethargic crab disease (LCD) is an emergent infirmity that has decimated native populations of the mangrove land crab (Ucides cordatus, Decapoda: Ocypodidae) along the Brazilian coast. Several potential etiological agents have been linked with LCD, but only in 2005 was it proved that it is caused by an ascomycete fungus. This is the first attempt to develop a mathematical model to describe the epidemiological dynamics of LCD. The model presents four possible scenarios, namely, the trivial equilibrium, the disease-free equilibrium, endemic equilibrium, and limit cycles arising from a Hopf bifurcation. The threshold values depend on the basic reproductive number of crabs and fungi, and on the infection rate. These scenarios depend on both the biological assumptions and the temporal evolution of the disease. Numerical simulations corroborate the analytical results and illustrate the different temporal dynamics of the crab and fungus populations.

Antonio Ostrensky - One of the best experts on this subject based on the ideXlab platform.

  • Is Marine Dispersion of the Lethargic Crab Disease Possible? Assessing the Tolerance of Exophiala cancerae to a Broad Combination of Salinities, Temperatures, and Exposure Times
    Mycopathologia, 2017
    Co-Authors: Raphael Orélis-ribeiro, Antonio Ostrensky, Vânia A. Vicente, Marcelo A. Chammas, Walter A. Boeger
    Abstract:

    Since 1997, an emergent fungal disease named lethargic crab disease (LCD) has decimated stocks of the edible mangrove land crab Ucides cordatus (Linnaeus, 1763) (Brachyura: Ocypodidae) along the Brazilian coast, threatening the mangrove ecosystem and causing socioeconomic impacts. Evidence from a variety of sources suggests that the black yeast Exophiala cancerae (Herpotrichiellaceae, Chaetothyriales) has been responsible for such epizootic events. Based on the spatiotemporal patterns of the LCD outbreaks, the well-established surface ocean currents, and the range of ecological traits of Exophiala spp., a marine dispersal hypothesis may be proposed. Using in vitro experiments, we tested the survival and growth of E. cancerae CBS 120420 in a broad combination of salinities, temperatures, and exposure times. While variation in salinity did not significantly affect the growth of colony-forming units (CFUs) ( P  > 0.05), long exposure times visibly influenced an increase in CFUs growth ( P  

  • The Organization of the Mitochondrial Control Region in 2 Brachyuran Crustaceans: Ucides cordatus
    2015
    Co-Authors: Marcio R. Pie, Walter A. Boeger, Antonio Ostrensky, Jose ́ F. Oliveira-neto, A. Baggio
    Abstract:

    The control region (CR) is the largest noncoding segment of the mitochondrial DNA and includes the major regulatory elements for its replication and expression. In addition, the high level of intraspecific genetic variability found in the CR favors its use in phylogeographical and population genetic studies of a variety of organisms. However, most of the work on the structure of the CR has focused on vertebrates and insects, and little is known about the evolution of the CR in other taxa. In this study, we sequenced the entire CR of several individuals of 2 crab species: Ucides cordatus (Ocypodidae) and Cardisoma guanhumi (Gecarcinidae). There were neither large conserved regions in the CR of either species nor any similarity among species at the nucleotide level. However, the spatial pattern of genetic variability on the CR was similar among species. I

  • Genetic evidence for multiple paternity in the mangrove land crab Ucides cordatus (Decapoda: Ocypodidae)
    Marine Biology Research, 2011
    Co-Authors: Rafael A. Baggio, Maria W. Pil, Walter A. Boeger, Luciana Patella, Antonio Ostrensky, Marcio R. Pie
    Abstract:

    Abstract Studies on mating patterns of marine crustaceans are rare, but the few studies on brachyuran crabs to date suggest that polyandrous mating is uncommon. In the present study, we used 6 microsatellite loci to genotype 8–16 larvae obtained from each of 10 gravid females of the crab Ucides cordatus (Brachyura: Ocypodidae). Based on the number of non-maternal alleles detected among the offspring, at least 40% of the females were inseminated by more than one male. We suggest forced copulation and maintenance of sperm in spermathecae throughout the year as possible causes of polyandry in U. cordatus.

  • Specific primers for the detection of the black-yeast fungus associated with lethargic crab disease (LCD).
    Diseases of aquatic organisms, 2011
    Co-Authors: Marcio R. Pie, Walter A. Boeger, Luciana Patella, Vânia Aparecida Vicente, Raphael O. Ribeiro, Antonio Ostrensky
    Abstract:

    Lethargic crab disease (LCD) is an emerging infirmity that has been causing extensive mortalities in populations of the mangrove land crab Ucides cordatus (Ocypodidae) along the Atlantic coast of Brazil. Previous studies have indicated that LCD is associated with a dematiaceous fungus, Exophiala cancerae de Hoog et al. In the present study, we sequenced the internal transcribed spacer (ITS) of the rDNA region of this black yeast species and developed species-specific PCR primers. Sensitivity tests indicated that the developed protocol is capable of detecting very small amounts of target DNA. Also, the application of the protocol to a variety of other dematiaceous fungi did not generate any false positives. The specific primers provided in the present study represent an important tool for rapidly surveying a large number of crab individuals, as well as environmental samples. Such knowledge will be instrumental in understanding the epidemiological dynamics of LCD.

  • Modelling the lethargic crab disease.
    Journal of biological dynamics, 2009
    Co-Authors: Claudia Pio Ferreira, Walter A. Boeger, Marcio R. Pie, Lourdes Esteva, Paulo Fernando De Arruda Mancera, Antonio Ostrensky
    Abstract:

    The lethargic crab disease (LCD) is an emergent infirmity that has decimated native populations of the mangrove land crab (Ucides cordatus, Decapoda: Ocypodidae) along the Brazilian coast. Several potential etiological agents have been linked with LCD, but only in 2005 was it proved that it is caused by an ascomycete fungus. This is the first attempt to develop a mathematical model to describe the epidemiological dynamics of LCD. The model presents four possible scenarios, namely, the trivial equilibrium, the disease-free equilibrium, endemic equilibrium, and limit cycles arising from a Hopf bifurcation. The threshold values depend on the basic reproductive number of crabs and fungi, and on the infection rate. These scenarios depend on both the biological assumptions and the temporal evolution of the disease. Numerical simulations corroborate the analytical results and illustrate the different temporal dynamics of the crab and fungus populations.

Walter A. Boeger - One of the best experts on this subject based on the ideXlab platform.

  • Is Marine Dispersion of the Lethargic Crab Disease Possible? Assessing the Tolerance of Exophiala cancerae to a Broad Combination of Salinities, Temperatures, and Exposure Times
    Mycopathologia, 2017
    Co-Authors: Raphael Orélis-ribeiro, Antonio Ostrensky, Vânia A. Vicente, Marcelo A. Chammas, Walter A. Boeger
    Abstract:

    Since 1997, an emergent fungal disease named lethargic crab disease (LCD) has decimated stocks of the edible mangrove land crab Ucides cordatus (Linnaeus, 1763) (Brachyura: Ocypodidae) along the Brazilian coast, threatening the mangrove ecosystem and causing socioeconomic impacts. Evidence from a variety of sources suggests that the black yeast Exophiala cancerae (Herpotrichiellaceae, Chaetothyriales) has been responsible for such epizootic events. Based on the spatiotemporal patterns of the LCD outbreaks, the well-established surface ocean currents, and the range of ecological traits of Exophiala spp., a marine dispersal hypothesis may be proposed. Using in vitro experiments, we tested the survival and growth of E. cancerae CBS 120420 in a broad combination of salinities, temperatures, and exposure times. While variation in salinity did not significantly affect the growth of colony-forming units (CFUs) ( P  > 0.05), long exposure times visibly influenced an increase in CFUs growth ( P  

  • The Organization of the Mitochondrial Control Region in 2 Brachyuran Crustaceans: Ucides cordatus
    2015
    Co-Authors: Marcio R. Pie, Walter A. Boeger, Antonio Ostrensky, Jose ́ F. Oliveira-neto, A. Baggio
    Abstract:

    The control region (CR) is the largest noncoding segment of the mitochondrial DNA and includes the major regulatory elements for its replication and expression. In addition, the high level of intraspecific genetic variability found in the CR favors its use in phylogeographical and population genetic studies of a variety of organisms. However, most of the work on the structure of the CR has focused on vertebrates and insects, and little is known about the evolution of the CR in other taxa. In this study, we sequenced the entire CR of several individuals of 2 crab species: Ucides cordatus (Ocypodidae) and Cardisoma guanhumi (Gecarcinidae). There were neither large conserved regions in the CR of either species nor any similarity among species at the nucleotide level. However, the spatial pattern of genetic variability on the CR was similar among species. I

  • Genetic evidence for multiple paternity in the mangrove land crab Ucides cordatus (Decapoda: Ocypodidae)
    Marine Biology Research, 2011
    Co-Authors: Rafael A. Baggio, Maria W. Pil, Walter A. Boeger, Luciana Patella, Antonio Ostrensky, Marcio R. Pie
    Abstract:

    Abstract Studies on mating patterns of marine crustaceans are rare, but the few studies on brachyuran crabs to date suggest that polyandrous mating is uncommon. In the present study, we used 6 microsatellite loci to genotype 8–16 larvae obtained from each of 10 gravid females of the crab Ucides cordatus (Brachyura: Ocypodidae). Based on the number of non-maternal alleles detected among the offspring, at least 40% of the females were inseminated by more than one male. We suggest forced copulation and maintenance of sperm in spermathecae throughout the year as possible causes of polyandry in U. cordatus.

  • Specific primers for the detection of the black-yeast fungus associated with lethargic crab disease (LCD).
    Diseases of aquatic organisms, 2011
    Co-Authors: Marcio R. Pie, Walter A. Boeger, Luciana Patella, Vânia Aparecida Vicente, Raphael O. Ribeiro, Antonio Ostrensky
    Abstract:

    Lethargic crab disease (LCD) is an emerging infirmity that has been causing extensive mortalities in populations of the mangrove land crab Ucides cordatus (Ocypodidae) along the Atlantic coast of Brazil. Previous studies have indicated that LCD is associated with a dematiaceous fungus, Exophiala cancerae de Hoog et al. In the present study, we sequenced the internal transcribed spacer (ITS) of the rDNA region of this black yeast species and developed species-specific PCR primers. Sensitivity tests indicated that the developed protocol is capable of detecting very small amounts of target DNA. Also, the application of the protocol to a variety of other dematiaceous fungi did not generate any false positives. The specific primers provided in the present study represent an important tool for rapidly surveying a large number of crab individuals, as well as environmental samples. Such knowledge will be instrumental in understanding the epidemiological dynamics of LCD.

  • Modelling the lethargic crab disease.
    Journal of biological dynamics, 2009
    Co-Authors: Claudia Pio Ferreira, Walter A. Boeger, Marcio R. Pie, Lourdes Esteva, Paulo Fernando De Arruda Mancera, Antonio Ostrensky
    Abstract:

    The lethargic crab disease (LCD) is an emergent infirmity that has decimated native populations of the mangrove land crab (Ucides cordatus, Decapoda: Ocypodidae) along the Brazilian coast. Several potential etiological agents have been linked with LCD, but only in 2005 was it proved that it is caused by an ascomycete fungus. This is the first attempt to develop a mathematical model to describe the epidemiological dynamics of LCD. The model presents four possible scenarios, namely, the trivial equilibrium, the disease-free equilibrium, endemic equilibrium, and limit cycles arising from a Hopf bifurcation. The threshold values depend on the basic reproductive number of crabs and fungi, and on the infection rate. These scenarios depend on both the biological assumptions and the temporal evolution of the disease. Numerical simulations corroborate the analytical results and illustrate the different temporal dynamics of the crab and fungus populations.

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