The growth of jellyfishes

Palomares, M.L.D.; Pauly, Daniel

doi:10.1007/s10750-008-9582-y

Cited by 45 publications

(18 citation statements)

References 38 publications

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“…The asymptotic CW (CW inf ) was estimated using the Wetherall plot routine (Wetherall, 1986;Pauly, 1986;Wetherall et al, 1987), which is a method that has proven extremely robust to estimate asymptotic length, even when there is no clear modal progression (Palomares and Pauly, 2009).…”

Section: Methodsmentioning

confidence: 99%

Population biology and color patterns of the blue land crab, Cardisoma guanhumi (Latreille 1828) (Crustacea: Gecarcinidae) in the Northeastern Brazil

2014

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The objective of this study was to analyze the population biology and color patterns of Cardisoma guanhumi Latreille, 1828 in a mangrove area in Natal, Rio Grande do Norte, Brazil. Crabs were collected monthly between February 2010 and January 2012 and totaled 1,837 individuals. Sex ratios were similar between males and females in the first year and differed in the second. Sex ratios by size class differed statistically in the extremes of the distribution, with an abundance of males in the large size classes. There was no difference (p > 0.05) in carapace width between males and females in the first year, but in the second year, males were larger than females (p = 0.003), showing the importance of considering interannual variation in such studies. Both sexes presented a unimodal distribution. The size of first maturing of the females was 6.00 cm. Asymptotic carapace width for males was 9.4 cm and females for 9.2 cm, using the Wetherall method. There was no defined modal progression, which made the determination of the Von Bertalanffy growth parameter K impossible. Juveniles were found throughout all months of the year, demonstrating that there was no defined period of recruiting, although slightly fewer juveniles were found in the dry season. Four color patterns were observed, the three first patterns were the same for both sexes, while the fourth pattern was observed in females only. The four color patterns identified could be clearly related to the stage of development (size) and sexual maturity of the animal.Keywords: blue land crab, colour pattern, sex ratio, size frequency distribution.Biologia Populacional e padrões de coloração do caranguejo terrestre, Cardisoma guanhumi (Latreille 1828) (Crustacea: Gecarcinidae) no Nordeste do Brasil ResumoO objetivo deste artigo foi analisar a biologia populacional e os padrões de coloração da carapaça de Cardisoma guanhumi Latreille, 1828 em uma área de manguezal em Natal, Rio Grande do Norte, Brasil. Os caranguejos foram coletados mensalmente entre fevereiro de 2010 e janeiro de 2012 e totalizaram 1837 caranguejos. A proporção sexual foi semelhante para machos e fêmeas (1:1) no primeiro ano e diferiu no segundo ano. A proporção sexual por classe de tamanho diferiu estatisticamente nas classes extremas da distribuição, com abundância de machos nas superiores. Não houve diferença (p ≥ 0,05) entre as larguras de carapaça de machos e fêmeas no primeiro ano, porém no segundo os machos foram maiores que as fêmeas (p = 0,003), revelando à importância de se considerar as variações interanuais nestes estudos. Ambos os sexos apresentaram distribuição unimodal. O tamanho de primeira maturação sexual das fêmeas foi 6,00 cm. A largura de carapaça assintótica para machos foi de 9,4 cm e para as fêmeas de 9,2 cm, usando o método Wetherall. Não houve progressão modal definida, o que impossibilitou a determinação do parâmetro de crescimento k de Von Bertalanffy. Foram encontrados juvenis ao longo de todos os meses do ano, mostrando não haver um período de recrutamento definido...

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Section: Methodsmentioning

confidence: 99%

Population biology and color patterns of the blue land crab, Cardisoma guanhumi (Latreille 1828) (Crustacea: Gecarcinidae) in the Northeastern Brazil

2014

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“…On the other hand, production, in EwE models (Table 1), is usually estimated from biomass and turnover rates (P/B), which is equivalent, under equilibrium, to total mortality (Allen, 1971). Palomares & Pauly (2008) suggest that this approach, which requires estimation of individual growth parameters, can be applied to jellyfish, in spite of major differences in life-history characteristics between jellyfish (medusae and ctenophores) and fish.…”

Section: Jellyfish In (Ecopath) Ecosystem Modelsmentioning

confidence: 99%

Jellyfish in ecosystems, online databases, and ecosystem models

et al. 2008

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“…Turnover times of isotopes in gelatinous zooplankton need to be investigated to determine how rapidly they will respond to changes in the baseline signature. Given that medusae grow very rapidly (e.g., Palomares & Pauly, 2008), growth, rather than metabolic maintenance, may be expected to have a greater influence on turnover rates.…”

Section: Limitations Of Isotopic Techniques and Potential Solutionsmentioning

confidence: 99%

Stable isotope and fatty acid tracers in energy and nutrient studies of jellyfish: a review

2008

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Studies of the trophic ecology of gelatinous zooplankton have predominantly employed gut content analyses and grazing experiments. These approaches record only what is consumed rather than what is assimilated by the jellyfish, only provide evidence of recent feeding, and unless digestion rates of different prey are known, may provide biased estimates of the relative importance of different prey to jellyfish diets. Biochemical tracers, such as stable isotopes and fatty acids, offer several advantages because they differentiate between what is assimilated and what is simply ingested, they provide an analysis of diet that is integrated over time, and may be useful for identifying contributions from sources (e.g., bacteria) that cannot be achieved using gut content approaches. Stable isotope analysis has become more rigorous through recent advances that provide: (1) signature determination of microscopic organisms such as microalgae, (2) analysis of dissolved organic carbon, and (3) improved quantification of relative source contributions. The limitation that natural tracer techniques require different dietary sources to have unique signatures can potentially be overcome using pulse-chase isotope enrichment experiments. Trophic studies of gelatinous zooplankton would benefit by integrating several approaches. For example, gut content analyses may be used to identify potential dietary sources. Stable isotopes could then be used to determine which sources are assimilated and modeling could be used to quantify the contribution of different sources to the diet. Analysis of fatty acid profiles could be used to identify contributions of bacterioplankton to the diet and, potentially, to provide an alternative means of identifying dietary sources in situations where the isotopic signatures of different potential dietary sources overlap. In this review, we outline the application, advantages, and limitations of gut content analyses and stable isotope and fatty acid tracer techniques and discuss the benefits of using an integrated approach toward studies of the trophic ecology of gelatinous zooplankton.

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The growth of jellyfishes

Cited by 45 publications

References 38 publications

Population biology and color patterns of the blue land crab, Cardisoma guanhumi (Latreille 1828) (Crustacea: Gecarcinidae) in the Northeastern Brazil

Population biology and color patterns of the blue land crab, Cardisoma guanhumi (Latreille 1828) (Crustacea: Gecarcinidae) in the Northeastern Brazil

Jellyfish in ecosystems, online databases, and ecosystem models

Stable isotope and fatty acid tracers in energy and nutrient studies of jellyfish: a review

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