Effects of osmotic stress on crustacean larval growth and protein and lipid levels are related to life-histories: The genus Armases as a model

Torres, Gabriela; Giménez, Luis; Anger, Klaus

doi:10.1016/j.cbpb.2007.05.011

Cited by 22 publications

(17 citation statements)

References 27 publications

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“…for measurements of the lipid and protein contents. The lipid content of the homogenate was determined with the sulphophosphovanillin method (Zöllner and Kirsch 1962) modified for microplates (Torres et al 2007b). The protein content of the homogenate was determined using a BioRad (München, Germany) DC Protein Assay kit (based on the method of Lowry et al 1951), which was also modified for microplates (Torres et al 2007a).…”

Section: Measurements Of Body Size Dry Mass and Elemental Compositionmentioning

confidence: 99%

Adaptive traits in ecology, reproduction and early life history of Sesarma meridies, an endemic stream crab from Jamaica

Anger

Torres

Nettelmann

2007

Mar. Freshwater Res.

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The endemic Jamaican freshwater crab Sesarma meridies lives in shady microhabitats on river banks, where temperature and pH are lower and ion concentrations higher than in mid-stream water. Ovigerous females were found to release up to 140 yolk-rich larvae (hatching period: 1 week; >90% at night). Larval development comprised two fully lecithotrophic zoeal stages and a feeding megalopa, which was also able to develop without food (facultative lecithotrophy). After metamorphosis in complete absence of food, juvenile crabs showed reduced body size, delayed moulting, and enhanced mortality. Endotrophic development was fuelled by internal lipid reserves; proteins were conserved as structural components of tissues and organs. Fed megalopae enhanced their protein content rather than re-stocking previously lost lipid reserves. Ecdysial biomass (CHN) losses were very low (zoeal stages: 1–2%; megalopa: 3–7%), showing an energy-saving production of thin exuviae. An extended hatching period may reduce intraspecific competition or cannibalism among juveniles; nocturnal hatching should reduce the predation on larvae. Large egg size, enhanced yolk reserves, an extended embryonic development (7 weeks at 24°C; implying a prolonged period of brood care), abbreviated and partially food-independent larval development, and reduced exuvial losses are considered as life-history adaptations to unpredictable planktonic food availability in the breeding habitat.

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Section: Measurements Of Body Size Dry Mass and Elemental Compositionmentioning

confidence: 99%

Adaptive traits in ecology, reproduction and early life history of Sesarma meridies, an endemic stream crab from Jamaica

Anger

Torres

Nettelmann

2007

Mar. Freshwater Res.

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“…This parameter is of extreme importance in the life of decapod crustaceans due to its inXuence on several aspects of larval biology, such as, survival, development, morphology, the moulting cycle, growth, feeding, metabolism, energy partitioning, and behaviour (for review see Anger 2001Anger , 2003. Salinity may also aVect the biochemical composition and embryogenesis of decapod larvae causing variability in the early larval biomass, survival and growth (Giménez and Anger 2001;Torres et al 2007Torres et al , 2008.…”

Section: Introductionmentioning

confidence: 99%

Influence of salinity on the larval development of the fiddler crab Uca vocator (Ocypodidae) as an indicator of ontogenetic migration towards offshore waters

et al. 2011

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Larvae of many marine decapod crustaceans are released in unpredictable habitats with strong salinity Xuctuations during the breeding season. In an experimental laboratory study, we investigated the inXuence of seven diVerent salinities (0, 5, 10, 15, 20, 25 and 30) on the survival and development time of Wddler crab zoea larvae, Uca vocator, from northern Brazilian mangroves. The species reproduces during the rainy season when estuarine salinity strongly Xuctuates and often reaches values below 10 and even 5. Salinity signiWcantly aVected the survival rate and development period from hatching to megalopa, while the number of zoeal stages remained constant. In salinities 0 and 5, no larvae reached the second zoeal stage, but they managed to survive for up to 3 (average of 2.3 days) and 7 days (average of 5.1 days), respectively. From salinity 10 onwards, the larvae developed to the megalopal stage.However, the survival rate was signiWcantly lower (5-15%) and development took more time (average of 13.5 days) in salinity 10 than in the remaining salinities (15-30). In the latter, survival ranged from 80-95% and development took 10-11 days. Given the 100% larval mortality in extremely low salinities and their increased survival in intermediate and higher salinities, we conclude that U. vocator has a larval 'export' strategy with its larvae developing in oVshore waters where salinity conditions are more stable and higher than in mangrove estuaries. Thus, by means of ontogenetic migration, osmotic stress and resulting mortality in estuarine waters can be avoided.

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“…The lipid content of the homogenate was determined after the sulphophosphovanillin method following Zöll-ner & Kirsch (1962), modified for microplates (Torres et al 2007b). The protein content of the homogenate was determined using a modified method after Lowry et al (1951;kit: BioRad D C Protein Assay), adapted for microplates (Torres et al 2007a).…”

Section: Methodsmentioning

confidence: 99%

“…The strength of such effects depends on physiological adaptations, in particular on speciesspecific capabilities of osmoregulation. In fully marine species, whose larvae are stenohaline and osmoconforming, even moderately reduced salinities affect the rate of biomass accumulation, while larvae of euryhaline, osmoregulating species reveal significantly weaker responses to salinity variation (Torres et al , 2007b. Besides interspecific differences, some species show ontogenetic changes in their osmoregulatory ca-pacity and salinity tolerance (Charmantier 1998, Charmantier et al 2002, Torres et al 2007b).…”

Section: Introductionmentioning

confidence: 99%

“…In fully marine species, whose larvae are stenohaline and osmoconforming, even moderately reduced salinities affect the rate of biomass accumulation, while larvae of euryhaline, osmoregulating species reveal significantly weaker responses to salinity variation (Torres et al , 2007b. Besides interspecific differences, some species show ontogenetic changes in their osmoregulatory ca-pacity and salinity tolerance (Charmantier 1998, Charmantier et al 2002, Torres et al 2007b). We may therefore expect that stenohaline, osmoconforming larval stages of such species should exhibit a stronger response to salinity variation than other, more euryhaline and osmoregulating stages of the same species.…”

Section: Introductionmentioning

confidence: 99%

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Cumulative effects of low salinity on larval growth and biochemical composition in an estuarine crab, Neohelice granulata

Torres

Giménez²,

Anger³

2008

Aquat. Biol.

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Throughout the larval development of a highly euryhaline crab, Neohelice (= Chasmagnathus) granulata, we studied effects of reduced salinities (15 and 25 ‰ vs. seawater control at 32 ‰) on larval dry mass (W ) and biochemical composition (total lipid and protein). In the early zoeal stages (I, II), reduced salinity caused delayed moulting, while W and biochemical composition at ecdysis remained unaffected. This suggests that the capability of the Zoea I for hyper-osmoregulation (demonstrated in a previous study) mitigated potential effects of hypo-osmotic stress on biomass accumulation and biochemical composition, but did not prevent a developmental delay. After continued rearing at low salinities, later larval stages showed increasingly negative effects on growth. The Zoea IV, for instance, revealed at 15 ‰ significantly reduced W, lipid and protein contents compared to higher salinities, probably as a consequence of weak osmoregulatory capabilities in the zoeal stages II and III. Likewise, average daily rates of biomass accumulation (taking into account salinityinduced variations in development duration) were lower at reduced salinities. These negative effects on larval growth persisted throughout the Megalopa, in spite of a strong capability in this stage to hyper-osmoregulate. This indicates that the mitigating force of osmoregulation in the final larval stage was not strong enough to offset cumulative effects of a continuous exposure to osmotic stress lasting from hatching throughout the more stenohaline zoeal stages. Osmoregulation in N. granulata has implications for population dynamics in the field, where salinity conditions prevailing during the development in the plankton may influence larval condition and survival at metamorphosis, eventually affecting recruitment.

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Effects of osmotic stress on crustacean larval growth and protein and lipid levels are related to life-histories: The genus Armases as a model

Cited by 22 publications

References 27 publications

Adaptive traits in ecology, reproduction and early life history of Sesarma meridies, an endemic stream crab from Jamaica

Adaptive traits in ecology, reproduction and early life history of Sesarma meridies, an endemic stream crab from Jamaica

Influence of salinity on the larval development of the fiddler crab Uca vocator (Ocypodidae) as an indicator of ontogenetic migration towards offshore waters

Cumulative effects of low salinity on larval growth and biochemical composition in an estuarine crab, Neohelice granulata

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