Metamorphosis of mangrove crab megalopae, Ucides cordatus (Ocypodidae): Effects of interspecific versus intraspecific settlement cues

Simith, Darlan de Jesus de Brito; Diele, Karen

doi:10.1016/j.jembe.2008.06.005

Cited by 25 publications

(13 citation statements)

References 40 publications

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“…Direct effects of conspecific cues on overall fitness parameters are apparently restricted to megalopae and the first two juvenile stages. Faster metamorphosis and slightly higher growth rates in cued crabs, made possible by a shorter intermolt period at stage 2, may respectively allow settling on appropriate habitat (e.g., Forward et al, 2001;Simith & Diele, 2008) and reaching a size refuge from predation first (e.g., Moksnes, 2004;Almeida et al, 2011). Also, higher molting frequency allow enhanced allometric growth, and thus faster development of morphological attributes of putative adaptive significance, such as the case made here on alternative claw shape.…”

Section: Selection Versus Plasticitymentioning

confidence: 69%

“…Conspecific cues, in particular, can be important by increasing settlement rates of larvae (Burke, 1986;Smith & Peacock, 1990), and stimulating metamorphosis to the juvenile stage (Fitzgerald et al, 1998;Simith & Diele, 2008). Apart from increasing the time to metamorphosis and thus pelagic mortality risk, the absence of appropriate cues may also render negative latent effects, leading to reduced growth during the juvenile benthic phase (Gebauer et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

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Conspecific cues affect stage-specific molting frequency, survival, and claw morphology of early juvenile stages of the shore crab Carcinus maenas

Duarte

Flores

et al. 2013

Hydrobiologia

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2014Conspecific cues affect stage-specific molting frequency, survival, and claw morphology of early juvenile stages of the shore crab Abstract Benthic conspecific cues are used by competent larvae of many marine invertebrates to locate and settle on suitable habitat. However, aggregations of conspecifics can generate strong intraspecific competition and inter-cohort cannibalism. We investigated the effects of adult conspecific cues on general fitness parameters of juvenile Carcinus maenas (stages J1-J5), and used geometric morphometrics to investigate patterns of allometric growth indicative of life-history strategies and resource use potential. Cues induced faster metamorphosis and slightly shortened intermolt time in J2 individuals, at the expense of acute mortality in J1 crabs. These effects are cumulative but compensatory processes nullify differences by the end of the experiment. Allometric carapace change toward the adult standard remained unchanged, but conspecific cues induced first a change in size (J1) and then in shape (J5) of claws. In both control and cued juveniles, heterochely was incipient but apparent in J5 crabs. Independently of body side, conspecific cues triggered a very marked increase of the propodus posterior margin, presumably enhancing general strength. Therefore, early benthic stages may grow slightly faster to a size refuge, and develop stronger claws providing competitive advantage for the use of high-value food items when population density-dependent processes are more probable.

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Section: Selection Versus Plasticitymentioning

confidence: 69%

Section: Introductionmentioning

confidence: 99%

Conspecific cues affect stage-specific molting frequency, survival, and claw morphology of early juvenile stages of the shore crab Carcinus maenas

Duarte

Flores

et al. 2013

Hydrobiologia

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“…The water used in all of our experiments was adjusted to a salinity of 30 psu, filtrated through a 5 micrometer cellulose filter and disinfected using ultraviolet light. Metamorphosis induction procedures followed SIMITH & DIELE (2008), using water, conditioned with chemical stimulus from conspecific adults, as an inducer. This conditioned water was prepared through the 24 h immersion of 30 U. cordatus adults (males and females in the same proportion) for each1,000 L of seawater, followed by its filtration through a sieve (100 microns) into a sealed container.…”

Section: Methodsmentioning

confidence: 99%

“…Although effective, the amount of mangrove required to induce metamorphosis indoors, and at a large scale, would be so large that problems such as widespread contamination and logistics would make management impracticable. SIMITH & DIELE (2008) have shown that the induction of metamorphosis in U. cordatus can be obtained using only water, conditioned with chemical stimulus from conspecific adults, without the utilization of sediment. Although the assays conducted by this researcher were developed in a small scale, using individualized experimental units, it is possible that, under mass rearing conditions, a variation of this methodology could achieve satisfactory results, permitting the maintenance of larvae during metamorphosis and during early juvenile phase under laboratory conditions, inside nursery structures.…”

mentioning

confidence: 99%

Intraspecific interactions in the mangrove crab Ucides cordatus (Decapoda: Ocypodidae) during the metamorphosis and post-metamorphosis periods under laboratory conditions

Ventura

Silva

Ostrensky

et al. 2011

Zoologia (Curitiba, Impr.)

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Current efforts for restocking natural populations of the mangrove crab Ucides cordatus (Linnaeus, 1763) in Brazil have focused on developing a methodology for stimulating the metamorphosis of U. cordatus larvae at a large scale. The aim of the present study was to compare the mortality rates both in individual and mass conditions, during the induction of metamorphosis of megalopa to juvenile in U. cordatus, without the use of mangrove sediment as substrate. Furthermore, the importance of intraspecific antagonistic behavior on survivorship rates during early post-metamorphosis period was investigated. Metamorphosis was induced by the use of water conditioned with conspecific adults (30 indiv. 100 L-1 for 24 hours). In the first assay, megalopae were stimulated into metamorphosis in experimental vials, both under individual and mass rearing conditions. The second assay assessed the interactions between megalopae and first instar juveniles, which have metamorphosed for more than 24 hours. In the third assay, the existence of cannibalistic behavior among first instar juveniles under different experimental densities was investigated. Significant differences between survivorship rates of individuals that metamorphosed under individual and mass rearing conditions were detected. However no cannibalistic behavior between juveniles and megalopae was observed in the second assay. Juveniles reared at a density of 200 indiv.m-2 showed survivorship rates similar to those obtained under individual conditions. Yet 500 juveniles.m-2 treatments showed significantly lower survivorship rates. Intraspecific interactions appear to be an important problem in U. cordatus specifically during the metamorphosis, but not during larval and post-larval rearing

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“…As larvas do Ucides cordatus, são depositadas no mar pelas fêmeas do caranguejo e seu desenvolvimento compreende de 5 à 6 estágios larvais da fase zoea, em um período de de 3 à 5 semanas [8,5]. A migração do caranguejo jovem foi incorporada ao modelo, acontecendo durante os primeiros 30 dias de cada ano, em ambos sentidos, e é proporcional a quantidade de caranguejos jovens, sendo a constante de proporcionalidade dada por k 1 = 0, 01 n o de indivíduos por m 2 dias −1 .…”

Section: Migração De Caranguejos Jovens E Fungosunclassified

Modelando a Dispersão da Doença do Caranguejo Letárgico entre Estuários

Ferreira¹,

Ferreira²

2011

TEMA - Tendências Em Matemática Aplicada E Computacional

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Resumo.Neste trabalho apresenta-se um modelo de mapas acoplados para o estudo da dispersão da Doença do Caranguejo Letárgico (DCL) entre dois estuários, em que mediu-se a influência da coleta de caranguejos e da existência de caranguejos resistentes sobre a dinâmica da doença. Observou-se que a coleta de caranguejos afeta tanto a intensidade quanto a periodicidade da doença e pode diminuir a probabilidade da doença se estabelecer. Porém, existe um limiar muito pequeno entre a não existência da doença no estuário onde há coleta e a extinção da população de caranguejos. Mostrou-se que a existência de caranguejos resistentes diminui a probabilidade de que a doença se estabeleça e que a migração do fungo pelo mar pode causar a sincronização das epidemias nos estuários.Palavras-chave. Modelagem Matemática, Sincronização, Metapopulação. IntroduçãoO caranguejo-uçá, Ucides cordatus, é encontrado desde Flórida (EUA) até Santa Catarina (Brasil). Constitui uma das principais fontes de renda das comunidades que vivem próximas aos manguezais, as quais dependem de sua comercialização como fonte de renda, utilizando-o também como alimento. Este crustáceo é um dos principais responsáveis pela decomposição da matéria orgânica nos estuários, e um biomonitor natural de áreas críticas, uma vez que demonstra sensibilidade a diversos poluentes [3].Desde de 1997, observam-se eventos de mortandade do Ucides cordatus registrando-se uma diminuição de até 85% na taxa de captura do mesmo. Os caranguejos que residiam em regiões de mortandade, apresentavam sintomas semelhantes, a saber: letárgicos, sem controle das pernas e quelas, por isso deu-se a enfermidade, o nome de Doença do Caranguejo Letárgico (DCL). Vários experimentos foram realizados a fim de se identificar o que estava causando a doença nos caranguejos, mas somente em 2005 foi constatado que o agente causador da DCL é o fungo patogênico Exophiala cf psycrofila [2].

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Metamorphosis of mangrove crab megalopae, Ucides cordatus (Ocypodidae): Effects of interspecific versus intraspecific settlement cues

Cited by 25 publications

References 40 publications

Conspecific cues affect stage-specific molting frequency, survival, and claw morphology of early juvenile stages of the shore crab Carcinus maenas

Conspecific cues affect stage-specific molting frequency, survival, and claw morphology of early juvenile stages of the shore crab Carcinus maenas

Intraspecific interactions in the mangrove crab Ucides cordatus (Decapoda: Ocypodidae) during the metamorphosis and post-metamorphosis periods under laboratory conditions

Modelando a Dispersão da Doença do Caranguejo Letárgico entre Estuários

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