An energy budget for Simocephalus vetulus (O. F. Muller) (Crustacea : Cladocera)

Sharma, Prashant; Pant, M. C.

doi:10.1007/bf00007378

Cited by 17 publications

(10 citation statements)

References 21 publications

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“…In previous studies, the AE of carbon in Daphnia galeata and Bosmina longirostris (Cladocera) increased with decreasing food concentration, with a 9.1ϫ change in AE over the range of food concentrations tested (Urabe 1991;Urabe and Watanabe 1991). In general, there was a negative relationship between food concentration and carbon AE in different species of daphnids (Richman 1958;Schindler 1968;Lei and Armitage 1980;Sharma and Pant 1984). Such an inverse relationship was termed 'superfluous feeding' (Beklemischev 1962).…”

Section: Discussionmentioning

confidence: 94%

Trace metal assimilation and release budget in Daphnia magna

Wang

2002

Limnology & Oceanography

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The assimilation efficiency (AE), efflux rate, and release budget of Cd, Cr(III), Se(IV), and Zn by a freshwater zooplankton Daphnia magna were measured under different food concentrations. The AEs of trace elements by Daphnia on two algal diets (Chlamydomonas reinhardtii and Scenedesmus obliquus) were 30-77% for Cd, 8-44% for Cr, 24-58% for Se, and 7-66% for Zn at food concentrations ranging from 0.136 to 7.50 mg carbon L Ϫ1 . Metal AEs increased significantly with decreasing food concentrations, with a maximum increase of 5.5 and 4.0ϫ for Zn and Cr, respectively. AEs were generally on the order of Cd Ͼ Se Ͼ Zn Ͼ Cr. Efflux rate constants, determined during 7 d depuration after 8 d of exposure to metals in the dissolved phase or dietary phase, were 0.012-0.216 d Ϫ1, with the highest efflux for Zn, followed by Cr Ͼ Se Ͼ Cd. The relative contribution of different routes of metal loss to the overall metal loss was also quantitatively assessed during the 7-d depuration period. Metals differed substantially in their routes of release from Daphnia. In general, metal excretion into the dissolved phase was the most important route for metal loss. Molting represented nearly 50-70% and 20-70% of daily metal efflux for Cd and Zn, respectively, following aqueous exposure within the first 4 d but was Ͻ20 and Ͻ30%, respectively, following food exposure. Release by offspring production contributed substantially to Se efflux by the animals. Up to 44-67% and 16-47% of Se was lost from the animals through reproductive allocation on a daily basis following uptake from the aqueous and dietary phases, respectively. The major routes of Cr efflux were by excretion and feces egestion. Our study suggested that trace metal assimilation and regeneration in Daphnia may play an important role in the biogeochemical fates of metals in lake systems.

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Section: Discussionmentioning

confidence: 94%

Trace metal assimilation and release budget in Daphnia magna

Wang

2002

Limnology & Oceanography

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“…However, a negative relationship between food concentration and assimilation efficiency has been found for species of Daphniidae (Richman. 1958;Shindler, 1968;Lei & Armitage, 1980;Sharma & Pant. 1984; in press), although Richman's data are questionable (Lampert.…”

Section: Discussionmentioning

confidence: 99%

“…assimilation rates (Richman, 1958;Lampert, 1977a,b,c;Lei & Armitage. 1980;Sharma & Pant, 1984;Lynch, Weider & Lampert. 1986;Urabe & Watanabe, in press).…”

Section: Introductionmentioning

confidence: 99%

Effect of food concentration on the carbon balance of Bosmina longirostris (Crustacea: Cladocera)

Urabe

1991

Freshwater Biology

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1. The carbon balance of the small cladoceran, Bosmina longirostris, was examined at four food concentrations (0.05, 0.10, 0.25, 2.50mg C I" ) based on long-term growth experiments.2. At birth, B. longirostris allocated about 60% of assimilation to body growth at all food concentrations. However, allocation to body growth decreased with age and was less than 5% after the fourth instar at the lowest food concentration. The proportion allocated to reproduction increased with increasing food concentration, but was relatively constant among different adult instars.3. Assimilation rate increased with increasing food concentration and increasing body size: the mean rate from birth to 15 days was 6.6 times higher at the highest food concentration than at the lowest food concentration. However, with decreasing food concentration and increasing body size, a higher proportion of the assimilated carbon was lost as respiration. As a result, the net production rate reached a plateau at intermediate body size and was 9.1 times higher at the highest food concentration than at the lowest food concentration. 4. Comparison with previous studies revealed that B. longirostris is more efficient than Daphnia with regard to carbon production., especially at low food conditions, if the death rate is negligible.

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“…pulex (Richman 1958): maintenance>growth> reproduction (follows model of Bradley et al 1991) Simocephalus vetulus (Sharma and Pant 1984): maintenance > growth = reproduction (follows model of McCauley et al 1990b).…”

Section: Priority Rules For Energy Allocationmentioning

confidence: 99%

Energy allocation rules inDaphnia magna: clonal and age differences in the effects of food limitation

1992

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The allocation of energy to carapace formation, respiration, growth, and reproduction were examined in two parthenogenetic clones ofDaphnia magna (Cladocera) cultured at two levels of food (Chlorella) concentration. Clonal differences in energy allocation were more apparent at high ration (1.5 μg C mL) than at low ration (0.3 μg C mL). These differences included respiratory and molting costs, and the timing of energy allocation to growth and reproduction. A comparison of active vs. anesthetized animals revealed that the interclonal difference in respiration rate was the result of a difference in activity level. In both clones mass-specific rates of respiration, growth, and brood production all decreased at low vs. high ration levels, whereas mass-specific molt-loss rate increased. Lowered food concentration decreased the relative allocation of energy to growth and reproduction, but increased allocation to maintenance (respiration and carapace formation). These allocation responses to food limitation indicated that for both clones the highest energy priority was carapace formation. However, the relative priority of respiration, growth and reproduction varied with age and clone. In juveniles (instars 1-4) the priority ranking of growth was essentially equal to that of respiration, whereas respiration always had higher priority in adults (instars 5-9). All three possibilities for the relative ranking of growth and reproduction (i.e., growth>reproduction, growth=reproduction, and reproduction>growth), as specified by different models in the literature, were observed depending on age and clone. The energy allocation rules were also shown to vary between other daphniid species. Furthermore, metabolic responses to chronic food limitation may be different from responses to acute food deprivation. In this study, one clone showed a greater decrease in respiration rate as a result of lifetime food limitation than did the other, but the opposite was true when these clones were exposed to 48 h of starvation. These differences in allocation rules and in acute vs. chronic responses may have to be considered when using physiological data to modelDaphnia populations.

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An energy budget for Simocephalus vetulus (O. F. Muller) (Crustacea : Cladocera)

Cited by 17 publications

References 21 publications

Trace metal assimilation and release budget in Daphnia magna

Trace metal assimilation and release budget in Daphnia magna

Effect of food concentration on the carbon balance of Bosmina longirostris (Crustacea: Cladocera)

Energy allocation rules inDaphnia magna: clonal and age differences in the effects of food limitation

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