Variability in food consumption rate of natural populations in the spider,Nephila clavata

1992 ◽  
Vol 34 (1) ◽  
pp. 15-28 ◽  
Author(s):  
Tadashi Miyashita
Keyword(s):  
Food Consumption ◽  
Consumption Rate ◽  
Natural Populations ◽  
Food Consumption Rate

scholarly journals An evaluation of the relation between food consumption rate and equilibrium body-weight in male rats

1988 ◽  
Vol 60 (1) ◽  
pp. 151-160 ◽  
Author(s):  
Tom W. Gettys ◽  
Susan Mills ◽  
Donald M. Henrickst
Keyword(s):  
Body Weight ◽  
Food Intake ◽  
Food Consumption ◽  
Consumption Rate ◽  
Growth Efficiency ◽  
Intake Rate ◽  
Total Intake ◽  
Food Consumption Rate ◽  
Maintenance Requirements ◽  
Food Intake Rate

1. Two experimental approaches were employed to assess the relation between food consumption rate and maintenance requirements in male weanling rats. The first approach involved restricting food intake in rats previously given free access to food from weaning to 59 d of age. The second approach involved restriction of food intake to various levels after weaning. Maintenance requirements (g foodid per g body-weight (W)) were estimated by dividing the rate of food consumption by the resulting equilibrium W (EBW) for each animal. In addition, food consumption was partitioned into growth-independent (maintenance) and growth-dependent (gain) components by alternately setting W and specific growth rate (W') to zero in an equation relating food intake rate to W and W. Coupling coefficients representing maintenance consumption (g food/d per g W) and gain consumption (g food/g gain) were estimated for each animal by least squares.2. Both techniques for estimating maintenance consumption provided similar estimates within and across experiments, and regardless of when food restriction was imposed or its severity, consumption for maintenance was about 5% W/d.3. The EBW to which animals in each treatment group aspired was directly proportional to that group's food intake rate.4. Coventional measures of growth efficiency were also related to food intake; efficiency decreased with decreasing food intake. Partitioning food consumption into maintenance and gain components revealed that as the rate of food intake decreased, the proportion of total intake consumed for maintenance increased. The results suggest that growth efficiency declines during food intake restriction because proportionately more of total intake is used for maintenance, leaving less available for gain.

scholarly journals Fermented pollen substitute diet affects the lifespan of honey bee workers under the effect of food consumption rate and vitellogenin expression

2021 ◽  
Vol 3 (1) ◽  
pp. 39-49
Author(s):  
Mohamed Abd El-Moezz Mahbob ◽  
Rania-Qurashy Sayed ◽  
Adham Moustafa ◽  
Mohamed Fathallah Abdel-Rahman
Keyword(s):  
Honey Bee ◽  
Food Consumption ◽  
Consumption Rate ◽  
Food Consumption Rate ◽  
Effect Of Food ◽  
Honey Bee Workers

Diet composition and food consumption rate of harbor porpoises (Phocoena phocoena) in the western Baltic Sea

2017 ◽  
Vol 33 (4) ◽  
pp. 1053-1079 ◽  
Author(s):  
Heidi Andreasen ◽  
Stine D. Ross ◽  
Ursula Siebert ◽  
Niels G. Andersen ◽  
Katrin Ronnenberg ◽  
...  
Keyword(s):  
Baltic Sea ◽  
Food Consumption ◽  
Diet Composition ◽  
Consumption Rate ◽  
Phocoena Phocoena ◽  
Food Consumption Rate ◽  
Harbor Porpoises

Effects of Glyphosate Herbicide on Physiological Parameters of Koi Carp, Cyprinus Carpio (Linnaeus, 1758) Fingerlings 

2021 ◽  
Author(s):  
F. Sanudi ◽  
S.T. Indulkar ◽  
A.D. Adsul ◽  
A.S. Pawase ◽  
M.S. Sawant
Keyword(s):  
Oxygen Consumption ◽  
Food Consumption ◽  
Cyprinus Carpio ◽  
Consumption Rate ◽  
Ammonia Nitrogen ◽  
Nitrogen Excretion ◽  
Koi Carp ◽  
Food Consumption Rate ◽  
Carp Cyprinus Carpio ◽  
Glyphosate Herbicide

Background: Sub-lethal toxicity bioassay experiments were conducted to determine the toxicity of glyphosate herbicide on Koi carp, Cyprinus carpio fingerlings. Koi carp fingerlings with mean length 8.06 ± 0.99 cm were obtained from a freshwater fish seed hatchery of the university.Methods: The fishes were exposed to sub-lethal concentrations i.e. 1/10th (3.6 mgL-1) and 1/5th (6.6 mgL-1) of glyphosate. Oxygen consumption rate, Ammonia-Nitrogen excretion rate, Oxygen:Nitrogen ratio and food consumption rate were recorded after every 7 days for a period of 28 days.Result: Results indicated significant decrease (P less than 0.05) in oxygen consumption in 1/10th and 1/5th of LC50 concentrations. Ammonia-Nitrogen significcantly increased in exposed fishes. Oxygen : Nitrogen ratio and food consumption rate also significantly decreased (P greater than 0.05) in treated fishes. The results indicated that glyphosate had impacts on exposed fish, hence, the need of regulation of its usage to protect non-targeted species and the environment.

scholarly journals MEDICIÓN INDIRECTA DE LA TASA DE CONSUMO DE ADULTOS E INMADUROS DE Trialeurodes vaporariorum (HEMIPTERA: ALEYRODIDAE) SOBRE FRÍJOL

2015 ◽  
Vol 20 (3) ◽  
pp. 99-109
Author(s):  
Luisa Fernanda SUÁREZ GONZALES ◽  
Marco Antonio DÍAZ TAPIAS ◽  
Daniel RODRÍGUEZ CAICEDO ◽  
Fernando CANTOR RINCÓN
Keyword(s):  
Food Consumption ◽  
Consumption Rate ◽  
Trialeurodes Vaporariorum ◽  
Indirect Measurement ◽  
Experimental Unit ◽  
Fresh Weight ◽  
Greenhouse Whitefly ◽  
Food Consumption Rate ◽  
And Control ◽  
Rate Of Consumption

<p>La biología y ecología de la mosca blanca de los invernaderos, <em>Trialeurodes vaporariorum </em>(Westwood) (Hemiptera: Aleyroridae), se encuentra ampliamente documentada. Sin embargo, hasta el momento no hay reportes acerca de la tasa de consumo de alimento por este fitófago, un parámetro necesario para modelos de simulación. Por tal motivo, el objetivo de esta investigación fue la medición indirecta del consumo de alimento por el adulto e instares inmaduros de <em>T. vaporariorum</em> basado en metodologías encontradas en la literatura científica. La estimación de la tasa de consumo de alimento por adultos se realizó bajo condiciones de laboratorio, utilizando como unidad experimental una planta de fríjol de dos semanas de edad. El experimento consistió de dos tratamientos: (T1) plantas libres de cualquier fitófago y (T2) plantas sometidas a infestaciones con <em>T. vaporariorum</em>, cada tratamiento con 20 repeticiones y una réplica en el tiempo de todo el experimento. Se registró el peso fresco diariamente en ambos tratamientos. Para el caso de los inmaduros, la unidad experimental consistió en una hoja cotiledónea de fríjol, infestada con una población determinada de inmaduros de cada instar de mosca blanca teniendo así cinco tratamientos (Instar I, II, III, IV y Control) cada uno con 17 repeticiones. Se registró diariamente el peso fresco de las hojas. Se obtuvo un consumo promedio de alimento por el adulto de 0,277 ± 0,0042 mg.dia<sup>-1</sup>. Para los dos primeros instares ninfales se estimó una tasa de consumo de 0,052 mg.dia<sup>-1</sup>, en el tercer instar de 0,14 mg.dia<sup>-1</sup>, y para el cuarto instar de 0,19 mg.dia<sup>-1</sup>. Un adulto de mosca blanca puede consumir en un día seis veces su peso y un inmaduro ocho veces, gracias a su rápido metabolismo y la constante excreción de mielecilla. </p><p><strong>Indirect Measurement of the</strong> <strong>Rate of Consumption of Adult and Immature of <em>Trialeurodes vaporariorum </em>(Hemiptera: Aleyrodidae) On Common Bean</strong></p><p>The biology and ecology of the greenhouse whitefly, <em>Trialeurodes vaporariorum </em>Westwood (Hemiptera: Aleyroridae), is widely documented. However, so far there are not reports about the rate of consumption of this phytophagous. Therefore, the objective of this research was to measure the food consumption by the adult and immature instars of <em>T. vaporariorum</em> based on indirect methodologies found in the literature. The estimate of the food consumption rate by adults was conducted under laboratory conditions, using as experimental units plant beans two weeks old. The experiment consisted of two treatments: (T1) plants free from any phytophagous and (T2) plants subjected to infestation with <em>T. vaporariorum</em>, with 20 repetitions each treatment and replicated over time. In the case of the immature individuals, the experimental unit consisted of a bean cotyledon leaf infested with a population of immature individuals of each instar of whitefly, having five treatments (Instar I, II, III, IV and Control) each with 17 repetitions. Fresh weight of leaves was recorded daily. An average food consumption of 0.277 ± 0.0042 mg.day<sup>-1</sup> was obtained for the adult. For the first two nymphal instars food consumption rate of 0.052 mg.day<sup>-1</sup> was estimated, for the third instar 0.14 mg.day<sup>-1</sup>, and for the fourth instar 0.19 mg.day<sup>-1</sup>. An whitefly adult can consume in a day six times its weight and an immature eight times, this thanks to the rapid metabolism and a constant excretion of honeydew of the species.</p>

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