First field record of mangrove crab Ucides cordatus (Crustacea: Decapoda: Ucididae) recruits co-inhabiting burrows of conspecific crabs

Schmidt, Anders Jensen; Diele, Karen

doi:10.1590/s1984-46702009000400026

Cited by 14 publications

(9 citation statements)

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“…The burrows found in the Itamaracá mangrove were usually inhabited only by a single individual of C. guanhumi, in contrast to the results Schmidt and Diele [69] for the mangrove crab Ucides cordatus, where burrows with up to four cohabitants were reported.…”

Section: Patterns Of Burrow Distribution and Burrow Densitycontrasting

confidence: 88%

Site fidelity and population structure of blue land crabs (Cardisoma guanhumi Latreille, 1825) in a restricted-access mangrove area, analyzed using PIT tags

Moraes-Costa

Schwamborn

2018

Helgol Mar Res

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Understanding the patterns of displacement and site fidelity in blue land crabs (Cardisoma guanhumi Latreille, 1825) has important implications for their conservation and management. The central objective of this study was to analyze seasonal variations in site fidelity in C. guanhumi, a species that is intensively exploited in Brazil, in spite of being part of the Official National List of Critically Endangered Species. This species currently suffers multiple severe threats, such as overharvesting and habitat destruction. C. guanhumi were sampled monthly at four fixed sectors that were delimited at the upper fringe of a restricted-access mangrove at Itamaracá Island between April 2015 and March 2016. One thousand and seventy-eight individuals were captured, measured, sexed, weighed, and their color patterns registered. Of these, 291 individuals were tagged with PIT (Passive Integrated Transponder) tags. Ninety-seven individuals (size range 27.0-62.6 mm carapace width) were successfully recaptured, totaling 135 recapture events. The largest interval between marking and recapture was 331 days. Through the use of mark-recapture-based models, it was possible to estimate the local population as being 1312 (± 417) individuals (mean density 2.23 ± 0.71 ind. m −2 ). Considering the mean density of burrow openings and individuals, there were 3.4 burrow openings per individual. C. guanhumi showed a clear philopatric behavior. Seventy-seven percent of recaptured individuals were recaptured in their sector of origin, and the remainder in an adjacent sector. Site fidelity was higher in females. Males showed minimum site fidelity in October, which is most likely related to be the onset of the reproductive season. The present study opens new perspectives for the definition of reproductive seasons, based on seasonal changes in behavior, and thus to improve the conservation of exploited and severely threatened species.

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Section: Patterns Of Burrow Distribution and Burrow Densitycontrasting

confidence: 88%

Site fidelity and population structure of blue land crabs (Cardisoma guanhumi Latreille, 1825) in a restricted-access mangrove area, analyzed using PIT tags

Moraes-Costa

Schwamborn

2018

Helgol Mar Res

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“…We could not identify any location as a potential source or sink of individuals. Results show an average high number of individuals (≈24) per generation in a species with overlapping generations ( Alcântara-Filho, 1978 ; Schmidt & Diele, 2009 ).…”

Section: Discussionmentioning

confidence: 99%

“…The plankton-to-benthos transition begins with the reinvasion of the estuary by the last larval stage—the megalopa. Megalopae settlement and metamorphosis occurs mainly at conspecific burrows ( Schmidt & Diele, 2009 ), triggered by odors emanated by juveniles and adults ( Simith, Abrunhosa & Diele, 2013 ). Adults reach the legal minimum capture size after 6.13 years in males and 7.38 years in females ( Diele & Koch, 2010 ).…”

Section: Introductionmentioning

confidence: 99%

Population connectivity and larval dispersal of the exploited mangrove crabUcides cordatusalong the Brazilian coast

Britto

Schmidt

Carvalho

et al. 2018

PeerJ

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BackgroundThe 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.MethodsNine 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.ResultsLoci 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.DiscussionThe 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.

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“…Os fatores ambientais como composição arbórea e nível de inundação de maré podem ter efeito significativo em relação ao tamanho dos indivíduos desta espécie (Wunderlich & Pinheiro, 2013), os juvenis tendem ocupar áreas mais elevadas e com menor frequência de inundação das marés (Hattori, 2006). Quando recruta o caranguejo-uçá pode co-habitar as galerias de caranguejos adultos "hospedeiros" (Schmidt, 2006;Schmidt & Diele, 2009), e após atingir fase de maior tamanho e mesmos hábitos alimentares que o caranguejo hospedeiro, saem das galerias provisórias e passam a construir suas próprias, migrando gradativamente, à medida que crescem, para as zonas mais inundadas do manguezal (Schmidt, 2012). Quando adultos tendem a não permanecer em altas densidades populacionais, evitando intensa competição por alimento e território (Nordhaus et al, 2009;Piou et al, 2009).…”

Section: Estimativa Da Densidade Populacional E Comercial (Potencial unclassified

Estimativa populacional e potencial extrativo do caranguejo-uçá no pós-defeso: subsídios à gestão em Unidade de Conservação de uso sustentável

Bromenschenkel

Tognella

2020

RSD

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Ucides cordatus (Linnaeus, 1763), o caranguejo-uçá, é um recurso de subsistência as comunidades do entorno dos manguezais da RDS Municipal Piraquê-açú e Piraquê-mirim (ES, Brasil). Com o objetivo de subsidiar a gestão deste recurso foi estimada a densidade populacional e comercial (potencial extrativo), o tamanho médio dos caranguejos, a razão sexual, bem como a porcentagem de galerias abertas e fechadas, no período pós-defeso, em 18 parcelas de 100m² ao longo do Sistema Estuarino. A densidade populacional encontrada foi 0,74 ± 0,24 ind./ m² e a comercial 0,10 ± 0,05 ind./m² podendo indicar contínua exploração da espécie na região. A razão sexual foi de 2:3, com largura de carapaça (LC) para machos de 55,77 a 80,38 mm e média de 67,12 ± 6,50 mm, e fêmeas de 25,34 a 74,94 mm e média de 61,60 ± 11,40 mm, valores próximos aos encontrados em estudos anteriores na RDS. As similaridades quanto às condições ambientais em que as populações de caranguejo-uçá se encontram ao longo do SEPAPM demonstram o potencial existente para o monitoramento da espécie, por isso são propostas estratégias de manejo a fim de auxiliar a gestão deste recurso pesqueiro na RDS Municipal.

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First field record of mangrove crab Ucides cordatus (Crustacea: Decapoda: Ucididae) recruits co-inhabiting burrows of conspecific crabs

Cited by 14 publications

References 2 publications

Site fidelity and population structure of blue land crabs (Cardisoma guanhumi Latreille, 1825) in a restricted-access mangrove area, analyzed using PIT tags

Site fidelity and population structure of blue land crabs (Cardisoma guanhumi Latreille, 1825) in a restricted-access mangrove area, analyzed using PIT tags

Population connectivity and larval dispersal of the exploited mangrove crabUcides cordatusalong the Brazilian coast

Estimativa populacional e potencial extrativo do caranguejo-uçá no pós-defeso: subsídios à gestão em Unidade de Conservação de uso sustentável

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