Phylogeography of the blue land crab, Cardisoma guanhumi (Decapoda: Gecarcinidae) along the Brazilian coast

2008 ◽  
Vol 88 (7) ◽  
pp. 1417-1423 ◽  
Author(s):  
José F. De Oliveira-Neto ◽  
Marcio R. Pie ◽  
Marcelo A. Chammas ◽  
Antonio Ostrensky ◽  
Walter A. Boeger
Keyword(s):  
Gene Flow ◽  
Brazilian Coast ◽  
Population Declines ◽  
Nested Clade Analysis ◽  
Ucides Cordatus ◽  
Land Crab ◽  
Geographical Structure ◽  
The North ◽  
Cardisoma Guanhumi ◽  
Blue Land Crab

Several crab species are important fishery resources in Brazil and their overexploitation has lead to severe population declines in some regions. The management of populations of these species should take into account the degree of gene flow among populations in different estuaries. The goal of the present study is to assess the degree of geographical structure in the genetic diversity of the blue land crab, Cardisoma guanhumi, along the Brazilian coast. A fragment of the control region of the mtDNA (750 bp) was sequenced for 95 specimens collected across 5 Brazilian states. Analyses using F-statistics failed to indicate any evidence of geographical structure, a result that was corroborated by a nested clade analysis of the same dataset. Mismatch distribution analyses indicated that populations of the blue land crab have experienced an expansion during their recent evolutionary past. The obtained results are similar to those recently described for another sympatric crab, Ucides cordatus, particularly with respect to the extensive degree of gene flow. However, populations of C. guanhumi seem to be older than those of U. cordatus and do not show the north–south expansion found in that species.

scholarly journals Genetic diversity of the blue land crab Cardisoma guanhumi (Latreille 1825) in the Alvarado Lagoon System in Veracruz, gulf coast of Mexico

2021 ◽  
Vol 49 (1) ◽  
pp. 136-147
Author(s):  
José Francisco Rendón-Hernández ◽  
Carlos Iván Pérez-Rostro ◽  
Ricardo González-Trujillo ◽  
Guadalupe Fabiola Arcos-Ortega ◽  
María de Lourdes Jiménez-Badillo ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Gene Flow ◽  
Gulf Coast ◽  
Coi Gene ◽  
Genetic Connectivity ◽  
High Genetic Diversity ◽  
Land Crab ◽  
Lagoon System ◽  
Cardisoma Guanhumi ◽  
Blue Land Crab

In the Alvarado Lagoon System (ALS) in south-central Veracruz on Mexico's gulf coast, the blue land crab, Cardisoma guanhumi, a semi-terrestrial crustacean species, represents an important fishery resource, but one that is subject to overexploitation and habitat destruction. Identifying genetic diversity and the genetic unit are required to establish efficient conservation strategies. The present study's goal was to assess the genetic structure and degree of genetic diversity of C. guanhumi populations along the ALS. A fragment of the D-loop region of the mtDNA (750 bp) and a partial sequence of the COI gene (580 pb) was sequenced for 120 specimens collected at four sites in the ALS. Genetic diversity indices were estimated for each marker. The study sites' gene flow was estimated, as was the effective population size and the mutational rate for each locality. A haplotype network was built to estimate the gene genealogies of the populations. A Tajima's neutrality test, Fu tests, and mismatch analysis were performed to detect demographic expansion. Results show that this C. guanhumi population has high genetic diversity with a large gene flow among the localities studied and expanded during the recent evolutionary past. All haplotypes from both markers are novel for the species, according to the NCBI GenBank. The high genetic diversity and genetic connectivity among sites suggests that the size of blue crab populations in the ALS has not been drastically affected by past exploitation. Finally, management strategies are proposed to protect the species.

MORPHOMETRY OF BLUE LAND CRAB (CARDISOMA GUANHUMI) BURROWS: ICHNOLOGICAL CONTEXT AND PALEOENVIRONMENTAL IMPLICATIONS

Palaios ◽  
2020 ◽  
Vol 35 (11) ◽  
pp. 461-469
Author(s):  
CHRISTOPHER A. SPARACIO ◽  
ILYA V. BUYNEVICH ◽  
H. ALLEN CURRAN ◽  
KAREN KOPCZNSKI
Keyword(s):  
Similarity Index ◽  
Keystone Species ◽  
Morphometric Parameter ◽  
Paleoenvironmental Reconstruction ◽  
Level Indicator ◽  
Land Crab ◽  
San Salvador ◽  
Cardisoma Guanhumi ◽  
San Salvador Island ◽  
Blue Land Crab

ABSTRACT A large brachyuran, the blue land crab (Cardisoma guanhumiLatreille, 1825) is a keystone species and a prolific burrower in a variety of low-latitude supratidal habitats; however, few studies have addressed its ichnological aspects. Here we present a detailed morphological assessment of C. guanhumi burrows and make comparisons to Macanopsis plataniformis, a trace fossil thought to be constructed by a similar brachyuran. Using nine burrow casts from a mangrove wetland on San Salvador Island, Bahamas, 29 dimensionless morphometric parameters were compared. Results of Bray-Curtis tests show high overall similarity index (0.85) between casts, with complexity, tortuosity, and opening inclination angle having moderate to high similarity (> 0.8). End chamber angle of the blue land crab has highest similarity both within the modern morphometric parameter dataset (> 0.9) and to that of M. plataniformis (0.88). The large terminal chamber is particularly important because of its high preservation potential, as a repository for organic remains, and as a reliable water table (∼ sea-level) indicator. Cluster analysis suggests size-independent Macanopsis-resembling burrow morphology among different extant taxa can be discriminated via quantitative neoichnological methods. Our findings demonstrate how a quantitative assessment of modern burrows and their likely counterparts from the sedimentary record can help constrain tracemaker identity and aid paleoenvironmental reconstruction of low-energy microtidal settings.

scholarly journals Population connectivity and larval dispersal of the exploited mangrove crab Ucides cordatus along the Brazilian coast

PeerJ ◽  
2018 ◽  
Vol 6 ◽  
pp. e4702 ◽  
Author(s):  
Fábio B. Britto ◽  
Anders J. Schmidt ◽  
Adriana M.F. Carvalho ◽  
Carolina C.M.P. Vasconcelos ◽  
Antonia M. Farias ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Population Structure ◽  
Gene Flow ◽  
Population Connectivity ◽  
Brazilian Coast ◽  
Fishery Resource ◽  
Ucides Cordatus ◽  
Migration Rates ◽  
Mangrove Crab ◽  
Key Species

Background The mangrove crab Ucides cordatus is considered a key species for the ecological balance of mangrove forests and a major source of employment and income for traditional crab collectors in Brazil. Several studies evidenced weak genetic variation among populations due to an efficient larval transport. However, gene flow patterns of the species is poorly understood, with no information about migration rates. The influence of the two main Brazilian currents in larval dispersion is also not clear. In order to provide baseline information for conservation, planning and management of this important fishery resource, the present study aimed to estimate and evaluate spatial distribution of genetic diversity, migration rates and gene flow directivity among populations of U. cordatus in Brazil. Methods Nine microsatellites were used to resolve population structure of 319 crabs collected from six sites located along the Brazilian coast. The degree of geographical differentiation included estimates of genetic diversity, population structure and gene flow models, with spatial analysis of shared alleles (SAShA), isolation by distance tests, AMOVA, discriminant analysis of principal components (DAPC) and Bayesian clustering. We estimated the amount of ongoing gene flow between clusters using the coalescent-based method implemented in Migrate-N. Results Loci were highly polymorphic (average of 12.4 alleles per locus) evidencing high genetic variability. There was significant differentiation among localities, despite of the low value of FST (= 0.019; P < 0.001). FST and Jost’s D indexes were also estimated in pairwise comparisons and showed significant differences between most of the surveyed site pairs (P < 0.05). Structure evidenced a single genetic group among samples, however SAShA pointed to a non-panmictic condition (P = 0.011). AMOVA detected four statistical significant clusters with low level of differentiation (FCT = 0.037; P = 0.023). The gene flow model that best described the population connectivity was the island model, with ∼24 crabs being exchanged among localities per generation. Discussion The high migration rates found among localities seem to be the main force acting to sustain the distribution of the genetic diversity of U. cordatus. Despite the high gene flow and the weak population structure among samples, the significant genetic differences found suggest that gene flow alone does not bypass the effects of genetic drift, natural selection and/or human exploitation. These findings are vital for the establishment of a database to be used in the development of conservation programs.

BURROW MORPHOMETRY OF THE BLUE LAND CRAB (CARDISOMA GUANHUMI): A FIELD-BASED NEOICHNOLOGICAL APPROACH

2017 ◽  
Author(s):  
Christopher A. Sparacio ◽  
◽  
Ilya V. Buynevich ◽  
Karen A. Kopcznski ◽  
H. Allen Curran ◽  
...  
Keyword(s):  
Land Crab ◽  
Cardisoma Guanhumi ◽  
Blue Land Crab

scholarly journals Mitochondrial DNA Variation Reveals a Sharp Genetic Break within the Distribution of the Blue Land Crab Cardisoma guanhumi in the Western Central Atlantic

Molecules ◽  
2015 ◽  
Vol 20 (8) ◽  
pp. 15158-15174 ◽  
Author(s):  
Maria Amaral ◽  
Marc Albrecht ◽  
Alan McKinley ◽  
Adriana de Carvalho ◽  
Severino Cavalcante de Sousa ◽  
...  
Keyword(s):  
Mitochondrial Dna ◽  
Dna Variation ◽  
Land Crab ◽  
Cardisoma Guanhumi ◽  
Central Atlantic ◽  
Genetic Break ◽  
Blue Land Crab

Conservation of the endangered blue land crab Cardisoma guanhumi Latreille in Latreille, Le Peletier, Serville & Guérin, 1828 (Decapoda: Brachyura: Gecarcinidae) in Brazil: optimal habitats and environmental factors

2021 ◽  
Vol 41 (2) ◽  
Author(s):  
Wendel R R Novais ◽  
Fabrício L Carvalho ◽  
Erminda C G Couto
Keyword(s):  
Environmental Parameters ◽  
Physical Factors ◽  
Native Forest ◽  
Spatial Distributions ◽  
Land Crab ◽  
Sandy Substrate ◽  
Physical Chemical ◽  
Cardisoma Guanhumi ◽  
Southern Bahia ◽  
Blue Land Crab

Abstract Cardisoma guanhumi Latreille in Latreille, Le Peletier, Serville & Guérin, 1828, the blue land crab, is a marine semi-terrestrial crab that builds burrows in different habitats along estuaries, an ecosystem severely modified and fundamental to this endangered species in Brazil. The presence of adequate habitats and physical, chemical, and biological conditions often determine the spatial distribution of populations. We aimed to characterize the most relevant environmental conditions among the main environments present in southern Bahia state, Brazil, and evaluate their influence on the spatial distributions of C. guanhumi to define which habitats are most critical for the conservation of the species. Our results showed that there is no relationship between spatial distributions and any particular habitat, but instead to the physical and other environmental parameters studied. Low-elevation areas along the river shore, shading, a supply of leaf litter, and bare sandy substrate are highlighted as priority for the conservation of C. guanhumi. These physical factors limit the distribution of juveniles, which form dense groups on river shores without significant differences between habitats. The preservation of the native forest and restinga shrubs that border rivers appear as fundamental for the conservation of the species.

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