Influence of food quantity and temperature on development and growth of the marine copepod Calanus chilensis from northern Chile

1997 ◽  
Vol 128 (2) ◽  
pp. 281-288 ◽  
Author(s):  
R. Escribano ◽  
C. Irribarren ◽  
L. Rodriguez
Keyword(s):  
Northern Chile ◽  
Marine Copepod ◽  
Food Quantity ◽  
Influence Of Food

Influence of Food Quantity and Lead Exposure on Maturation in Daphnia magna; Evidence for a Trade-Off Mechanism

1995 ◽  
Vol 9 (2) ◽  
pp. 175 ◽  
Author(s):  
E. L. Enserink ◽  
M. J. J. Kerkhofs ◽  
C. A. M. Baltus ◽  
J. H. Koeman
Keyword(s):  
Daphnia Magna ◽  
Lead Exposure ◽  
Trade Off ◽  
Food Quantity ◽  
Influence Of Food

scholarly journals The influence of food quantity on carbon and nitrogen stable isotope values in southern African spiny mice (Acomys spinosissimus)

2015 ◽  
Vol 93 (5) ◽  
pp. 345-351 ◽  
Author(s):  
G.N. Robb ◽  
S. Woodborne ◽  
P.R. de Bruin ◽  
K. Medger ◽  
N.C. Bennett
Keyword(s):  
Stable Isotope ◽  
Stable Isotope Analysis ◽  
Lipid Extraction ◽  
C:N Ratio ◽  
Isotope Analysis ◽  
Single Species ◽  
Carbon And Nitrogen ◽  
Food Quantity ◽  
Significant Difference ◽  
Influence Of Food

Stable isotope analysis is frequently applied as a tool to examine dietary patterns in animals. However, some of the underlying assumptions associated with using this approach are increasingly being questioned. We carried out a controlled diet experiment on the southern African spiny mouse (Acomys spinosissimus Peters, 1852) to test a number of aspects relating to these assumptions and also examine the hypothesis that stable isotopes, especially δ15N, can be used to provide evidence of nutritional stress. We compared the δ13C and δ15N values of livers and blood from animals that were fed ad libitum with animals undergoing a 10% reduction in food supply. Food-restricted animals showed no significant difference in δ15N; however, δ13C values of both liver and blood were depleted. Restricted animals also had a significantly lower C:N ratio. We examined the role of lipids and found following lipid extraction that both livers and lipids still showed the same separation in carbon values. Tissue–diet discrimination values were also calculated and found to be higher for both Δ13C and Δ15N compared with other mice species. Empirical values for discrimination rates were then compared with values calculated using an alternative method based on employing generic values and were found to be dissimilar, suggesting the use of generic values are not always appropriate. Our results highlight the need for greater understanding of the assumptions associated with using stable isotope analysis to examine diet and we suggest that studying a single species under captive conditions presents an ideal method to begin to test these hypotheses.

Influence of food quantity and quality on polymorphic dispersal behaviors in the gypsy moth, Lymantria dispar

1981 ◽  
Vol 59 (2) ◽  
pp. 293-296 ◽  
Author(s):  
Pedro Barbosa ◽  
Whitney Cranshaw ◽  
Jane A. Greenblatt
Keyword(s):  
Light Source ◽  
Lymantria Dispar ◽  
Light Stimulus ◽  
Acer Rubrum ◽  
Red Maple ◽  
Food Quantity ◽  
Level Of Activity ◽  
Gypsy Moths ◽  
Influence Of Food ◽  
Abundance And Distribution

Egg masses produced by female gypsy moths (Lymantria dispar) reared on red oak (Quercus rubra) or red maple (Acer rubrum) exhibit differences in the abundance and distribution of different-sized eggs. Partial starvation of larvae has no significant effect on mean egg size, although it does have a significant effect on mean number of eggs per mass.Larvae from eggs of different sizes exhibit differences in level of activity when responding to a light source. Larvae from large eggs move more rapidly towards a light stimulus than those from small eggs. A greater proportion of the larvae from smaller eggs failed to move towards a light source compared with those from large eggs. The role of food in the activity and dispersal of first-instar gypsy moths is discussed.

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