Carotenoids in<i>Daphnia</i>

Green, J

doi:10.1098/rspb.1957.0058

Cited by 71 publications

(4 citation statements)

References 13 publications

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“…There was also a similar tendency, albeit not significant (figure 2; MANOVA; F 1,6 Z4.24; p!0.085) in the UVF treatment. This suggests that smaller, younger individuals may be less responsive to UV, or that they are less sensitive due to transfer of photoprotective pigments from the mother (Green 1957;Siebeck et al 1994). However, the difference between surface and bottom waters for the smallest size fraction was less pronounced than in the absence of UV, i.e.…”

Section: Resultsmentioning

confidence: 99%

Size-structured risk assessments govern Daphnia migration

Hansson

Hylander

2008

Proc. R. Soc. B.

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One of the more fascinating phenomena in nature is animal mass migrations and in oceans and freshwaters, diel variations in depth distribution of zooplankton are a phenomenon that has intrigued scientists for more than a century. In our study, we show that zooplankton are able to assess the threat level of ultraviolet radiation and adjust their depth distribution to this level at a very fine tuned scale. Moreover, predation risk induces a size-structured depth separation, such that small individuals, which we show are less vulnerable to predation than larger, make a risk assessment and continue feeding in surface waters during day, offering a competitive release from down-migrating larger animals. Hence, we mechanistically show that such simple organisms as invertebrate zooplankton are able to make individual, size-specific decisions regarding how to compromise between threats from both predators and UV radiation, and adjust their diel migratory patterns accordingly.

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Section: Resultsmentioning

confidence: 99%

Size-structured risk assessments govern Daphnia migration

Hansson

Hylander

2008

Proc. R. Soc. B.

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“…Na revisão desse autor, o acúmulo dos complexos carotenóides nos ovos e ovários, bem como seu consumo durante o desenvolvimento embrionário ainda é questionável , embora sua concentração decresça inversamente, em alguns decápodos , com o crescimento do embrião. Os pigmentos carotenóides também atuam na absorção de radiações do espectro solar, principalmente a ultravioleta, conferindo proteção ao embrião de seus efeitos nocivos (GREEN 1957). Certamente o hábito bentônico de A. cribrarius faz com que esta função seja minimizada, já que a coluna d' água filtraria essa radiação, extremamente prejudicial a divisão celular e embriogênese.…”

Section: Discussionunclassified

Embriologia do siri Arenaeus cribrarius (Lamarck) (Crustacea, Brachyura, Portunidae)

Pinheiro

Hattori

2002

Rev. Bras. Zool.

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ABSTRACT. Embryology or the swimming crab Arenaeus cribrarius (Lamarck) (Crustacea, Brachyura, Portunidae). Ovigerous females of Arenaeus cribrarius were collected at Ubatuba, São Paulo, and maintaining in aquaria under controlled temperature (25±IOC), salinity (35±I %o) and photoperiod (12: 12). A small sample of eggs was collected for each 24h, for morphological description, chromatic changes and biometric analysis throughout the embryonic development. Eight egg stages were photographed and had their small and large diameters measured under a microscope provided with camera lucida. The egg' s shape was low elliptical during ali the embryogenesis and showed size increase (24.4%) and volume (91.1 %), when the last stage were compared with the first one. According to mean egg diameter and volume, the eggs should be pooled in three different groups (1-3; 4-6; 7-8) corresponding to initial, intermediate ando final stages. The attained results were compared with the literature which emphasizing the species of Portunidae's family .

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“…The semitransparent nature of zooplankton and the yellow-orange carotenoid pigments usually associated with neutral lipids (Green 1957) allow direct visual observation ofthese lipid stores. Goulden and Hornig (1980) and Tessier and Goulden (1982) devised a visual index to estimate the energy reserves of individual Daphnia.…”

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confidence: 99%

Optical‐digital measurements of energy reserves in Calanoid copepods: Intersegmental distribution and seasonal patterns

Arts

Evans

1991

Limnology & Oceanography

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We present a simple optical-digital method to measure visible energy reserves in calanoid COpepods. Seasonal patterns (spring-fall) of triacylglycerol energy reserves in Diaptomus sicilis were determined in a hypereutrophic and in a saline prairie lake. In addition to optical measurement of energy reserves, two well-established chemical techniques (microgravirnetric and Iatroscan TLC-FID analyses) were used over the same period. Seasonal patterns of visible energy reserves measured by the optical method were positively correlated with both the Iatroscan measurements of triacylglycerol (Pearson's r was between 0.72 and 0.87, P < 0.005) and the microgravimetric measurements of total lipid (Y was between 0.73 and 0.88, P < 0.005). Thus, the optical method can be used to investigate seasonal changes in energy reserves in calanoid copepods but at a substantially lower cost (equipment, handling time) than chemical-based methods. Moreover, the optical method offers increased resolution because energy reserves can be measured for each animal so that individual feeding success can be assessed, provides data on the partitioning of lipids in various body regions, and is nondestructive because anesthetized animals can be measured and returned to culture. Patterns of storage lipid reabsorption within discrete body regions may predict starvation risk in culture and in natural populations of copepods.

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Carotenoids inDaphnia

Cited by 71 publications

References 13 publications

Size-structured risk assessments govern Daphnia migration

Size-structured risk assessments govern Daphnia migration

Embriologia do siri Arenaeus cribrarius (Lamarck) (Crustacea, Brachyura, Portunidae)

Optical‐digital measurements of energy reserves in Calanoid copepods: Intersegmental distribution and seasonal patterns

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