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1

Sexual dimorphism in life history plasticity in the gypsy moth (Lymantria dispar L.).

100%
Lazarevic J., Peric-Mataruga V.
Folia Biologica
|
2003
|
vol. 51
|
issue 3-4
227-229
EN
Sexual differences in reaction norms of life history traits (larval development time-LDT, pupal weight-PW and adult longevity-L) were investigated in the gypsy moth reared on young or old oak leaves during the first larval instar. Sexual dimorphism was revealed for genetic variation in reaction norms that was expressed only for LDT in males, and PW and L in females. Higher mean plasticity of longevity was found in males compared to females indicating that the sexes are exposed to divergent selective pressures. Greater dependence of males on energy resources (carbohydrates and lipids) may account for the observed differences.
2

Behavioural response to an unsuitable host plant in the gypsy moth (Lymantria dispar L.)

81%
Lazarevic J., Peric-Mataruga V., Prolic Z., Tucic N.
Folia Biologica
|
2003
|
vol. 51
|
issue 1-2
129-131
EN
To assess local differentiation in host preference, a two-choice test was performed on firstinstar gypsy moth larvae originating from an oak and locust-tree forest. More than 40 generations feeding on locust-tree leaves, rich in alkaloids, led to non-efficient discrimination of host leaves in larvae from a locust-tree forest. Possible causes of observed population differences are discussed in the present paper.
3

Effects of rearing density on larval growth and activity of digestive enzymes in Lymantria dispar L. (Lepidoptera: Lymantriidae)

71%
Lazarevic J., Peric-Mataruga V., Vlahovic M., Mrdakovic M., Cvetanovic D.
Folia Biologica
|
2004
|
vol. 52
|
issue 1-2
105-112
EN
Density dependent responses of 4th, 5th and 6th instar gypsy moth larvae were studied at the level of larval mass, midgut loading and activities of three digestive enzymes (alpha-amylase, trypsin and leucine aminopeptidase). High density significantly reduced larval mass while midgut loading (expressed as relative midgut mass) did not change except in the 5th instar where it was increased at high density. Specific amylase and leucine aminopeptidase activities were not affected by crowding. Specific trypsin activity was on average higher in crowded than in isolated larvae. High density also affected the correlations between midgut protein content and activities of two proteolytic enzymes suggesting differences in regulatory mechanisms of insect digestion. The importance of these changes for survival under stressful conditions is discussed.
4

Effects of cadmium on protocerebral neurosecretory neurons and fitness components in Lymantria dispar L

61%
Ilijin L., Peric-Mataruga V., Radojicic R., Lazarevic J., Nenadovic V., Vlahovic M., Mrdakovic M.
Folia Biologica
|
2010
|
vol. 58
|
issue 1-2
91-99
EN
Changes in fitness components including larval stage duration, relative growth rate (RGR), and mass of the gypsy moth, Lymantria dispar L. (Lepidoptera: Lymantriidae), were investigated in caterpillars fed a synthetic diet with or without a cadmiumsupplement (10, 30, 100, 250 Fg Cd/g dry food weight). Morphometric changes of large protocerebral dorsomedial A2 neurosecretory neurons, their nuclei and the electrophoresis profiles of brain proteins were analyzed in the 4th instar gypsy moths fed the examined diets. The duration of the fourth larval instars were prolonged and RGR and body mass reduced if the caterpillars were fed diets containing high concentrations of cadmium(100 and 250 Fg). The size of large A2 dorsomedial neurosecretory neurons and their nuclei were significantly higher in larvae fed the diets supplemented with 10, 100 and 250 Fg Cd. A large amount of neurosecretory material appeared in dorsomedial neurosecretory neurons in larvae fed diets with 100 and 250 Fg Cd. Differences in larval brain protein profiles in the region ofmolecularmass ranges (Mr) of 98kDa, 46kDa and 3.4-6.1 kDa were identified in the experimental groups.
5

Changes in midgut and brain proteins in Morimus funereus larvae depending on nutritive substrate

52%
Ilijin L., Jankovic-Tomanic M., Mitic M., Vlahovic M., Lazarevic M., Lazarevic J., Peric-Mataruga V., Prolic Z., Nenadovic V.
|
EN
The response of Morimus funereus larvae to total starvation and refeeding with qualitatively different nutritive substrates (artificial diets supplemented with yeast as a source of B complex vitamins or with a digestibility reducer-tannic acid) was examined in this paper. Refeeding resulted in a compensatory increase of larval growth. Feeding and refeeding with qualitatively different nutritive substrates affected both quality and quantity of midgut and brain proteins. The observed differences suggest the possible switching of enzyme isoforms in M. funereus midgut and changes in synthesis/secretion of neurohormones, depending on food presence and its nutritional value.
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