Chemical induction in mangrove crab megalopae, Ucides cordatus (Ucididae): Do young recruits emit metamorphosis-triggering odours as do conspecific adults?

Simith, Darlan de Jesus de Brito; Abrunhosa, Fernando Araújo; Diele, Karen

doi:10.1016/j.ecss.2013.07.015

Cited by 12 publications

(7 citation statements)

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“…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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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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“…Subsequently, however, Paula et al (2003) described a stratified settlement pattern in a mangrove forest of Inhaca Island, Mozambique, reopening the debate on the spatial preferences of megalopae settlement. Paula et al (2003) suggested that the larvae of mangrove crabs probably develop specific mechanisms to settle in the same area inhabited by con-specific adults, thus supporting laboratory observations on the role of conspecific odours for triggering metamorphosis (Gebauer et al, 1998(Gebauer et al, , 2002Simith et al, 2013).…”

Section: Introductionmentioning

confidence: 78%

“…One East African mangrove crab, Chiromantes ortmanni, can, for example, extends its planktonic period by developing into an unusual VI zoea stage before becoming a megalopa (Guerao et al, 2012). Laboratory experiments have shown that the final megalopal competent phase, which occurs after 2-4 days from megalopal metamorphosis (O'Connor & Van, 2006;O'Connor, 2007;Steinberg et al, 2007;Simith et al, 2010), can be triggered by specific chemical and/or physical cues associated with the juvenile and/or adult habitat (Forward et al, 2001;Gebauer et al, 2002;Simith et al, 2013). Physical factors such as the characteristics of the substratum of the parental habitat (Christy, 1989;O'Connor & Judge, 1999;Gebauer et al, 2002;Diele & Simith, 2007) and specific temperatures and salinities (Wolcott & de Vries, 1994;Diele & Simith, 2006) can, therefore, influence settlement.…”

Section: Introductionmentioning

confidence: 98%

“…Physical factors such as the characteristics of the substratum of the parental habitat (Christy, 1989;O'Connor & Judge, 1999;Gebauer et al, 2002;Diele & Simith, 2007) and specific temperatures and salinities (Wolcott & de Vries, 1994;Diele & Simith, 2006) can, therefore, influence settlement. Biological factors such as water soluble chemicals released by conspecific adult crabs (Jensen, 1989;Jensen & Armstrong, 1991;O'Connor & Gregg, 1998;Diele & Simith, 2007;Simith et al, 2010Simith et al, , 2013, inter-specific odours (Gebauer et al, 1998(Gebauer et al, , 2002 and microbial biofilms (Christy, 1989;Diele & Simith, 2007) also feature as stimulants for metamorphosis.…”

Section: Introductionmentioning

confidence: 99%

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Temporal patterns of megalopal settlement in different areas of an East African mangrove forest (Gazi Bay, Kenya)

2015

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Most intertidal brachyurans produce planktonic larvae which develop pelagically and, after a certain time in the ocean, migrate towards the habitats that they will eventually settle in. One of the main physical processes affecting larval release and settlement in species inhabiting estuaries and mangroves is the tidal regime. In this study, we investigated whether patterns of settlement of brachyuran larvae at four sites (differing in tidal inundation and crab zonation) of a Kenyan mangrove were affected by the diurnal and lunar cycle of the tide. We collected megalopae at the four sites twice a day throughout two lunar months. Settlement differed at the four sites: at the subtidal site (the main creek within the forest) megalopae arrived during diurnal and nocturnal neap and spring tides, while at the three sites within the forest settlement occurred only at spring tide periods. Specific differences among these latter sites existed in terms of full versus new moon spring tides and, to a smaller extent, with diurnal period. Our results show that larval settlement in mangrove forests takes place at both landward and seaward belts and is a temporally complex event, driven by tidal cycles, but also in synergy with other factors.

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“…During the first juvenile stage the animals have reduced size, being attracted by conspecific odours that are left by adults in the sediment, aiming to attract individuals for recruitment in mangroves. [86][87][88] Therefore, polluted mangrove areas can affect the attractiveness of the uçá crab and recruitment, leading to a reduction of population density. 27 Otherwise, this species can be used as a testimonial of mangrove health, which has been proved in ecotoxicological studies that indicate the reliability of the contamination status of mangrove ecosystem using the uçá crab as a bioindicator.…”

Section: Case Study Of Mangrove Crab Ucides Cordatus and Other Semi-tmentioning

confidence: 99%

Chapter 10. The Crab Ucides cordatus (Malacostraca, Decapoda, Brachyura) and Other Related Taxa as Environmental Sentinels for Assessment and Monitoring of Tropical Mangroves from South America

Pinheiro¹,

Souza²,

Zanotto³

et al. 2017

Issues in Toxicology

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Coastal environments are highly affected by pollutants, carried from terrestrial areas to rivers and estuarine systems, in densely occupied areas where anthropic activities occur with no monitoring. Many accidents have occurred and here we highlight some significant ones: oil spills, e.g., 'Deepwater Horizon' drilling platform accident, 7 at a depth of 1500 m, occurred in April in the at Gulf of Mexico, where approximately 780 000 m 3 of crude oil was released to the sea over the course of three months; mine slag contamination, e.g., the Fundão dam collapse by the mining company Crabs as Environmental Sentinels for Tropical Mangroves 213 214 Chapter 10

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Chemical induction in mangrove crab megalopae, Ucides cordatus (Ucididae): Do young recruits emit metamorphosis-triggering odours as do conspecific adults?

Cited by 12 publications

References 55 publications

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

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

Temporal patterns of megalopal settlement in different areas of an East African mangrove forest (Gazi Bay, Kenya)

Chapter 10. The Crab Ucides cordatus (Malacostraca, Decapoda, Brachyura) and Other Related Taxa as Environmental Sentinels for Assessment and Monitoring of Tropical Mangroves from South America

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