Fluctuating Asymmetry in Colophospermum mopane Leaves and Oviposition Preference in an African Silk Moth Imbrasia belina

Oikos ◽  
1997 ◽  
Vol 79 (3) ◽  
pp. 484 ◽  
Author(s):  
David A. Wiggins
Keyword(s):  
Fluctuating Asymmetry ◽  
Oviposition Preference ◽  
Colophospermum Mopane ◽  
Silk Moth ◽  
Imbrasia Belina

A lepidopteran (Imbrasia belina) might influence tree-grass balance of Colophospermum mopane savanna

2018 ◽  
Vol 11 (4) ◽  
pp. 503-513
Author(s):  
Kevin J. Duffy ◽  
Timothy G. O’Connor ◽  
Obiora C. Collins
Keyword(s):  
Colophospermum Mopane ◽  
Imbrasia Belina

Intraspecific Host Preferences of Mopane Moths (Imbrasia belina) in Mopane (Colophospermum mopane) Woodland

2009 ◽  
Vol 44 (2) ◽  
pp. 131-140 ◽  
Author(s):  
Halszka Hrabar ◽  
Dawood Hattas ◽  
Johan T. du Toit
Keyword(s):  
Host Preferences ◽  
Colophospermum Mopane ◽  
Imbrasia Belina ◽  
Mopane Woodland

Coping with herbivory at the juvenile stage: responses to defoliation and stem browsing in the African savanna tree Colophospermum mopane

2012 ◽  
Vol 28 (2) ◽  
pp. 161-169 ◽  
Author(s):  
David C. Hartnett ◽  
Jacqueline P. Ott ◽  
Kathryn Sebes ◽  
Marks K. Ditlhogo
Keyword(s):  
Leaf Area ◽  
Plant Biomass ◽  
Leaf Size ◽  
Lateral Branch ◽  
Negative Effects ◽  
Total Leaf Area ◽  
Branch Number ◽  
Colophospermum Mopane ◽  
Total Leaf ◽  
Imbrasia Belina

Abstract:Responses of plants to herbivory are dependent on the type of damage and the ontogenetic stage of the plant. We compared the effects of stem pruning and defoliation on seedlings of Colophospermum mopane, an ecologically important tree species widely distributed in southern Africa. The growth of 160 greenhouse-grown juveniles were measured for 6-mo after germination and then 6-mo after treatments including 50% defoliation, 100% defoliation, 50% stem pruning and controls. Pruning resulted in 30% reductions in total leaf area, height and biomass. Partial defoliation resulted in 30% reductions in total leaf area and plant biomass. However, complete defoliation resulted in a 30% increase in biomass production, a doubling in leaf and lateral branch number, a 45% reduction in leaf size, and no change in total leaf area. Thus, completely defoliated seedlings showed greater performance than those that were only partially defoliated, indicating that C. mopane has become adapted to the chronic and severe defoliation inflicted by Imbrasia belina caterpillars. Comparison of our results with other studies indicates that C. mopane seedlings are less herbivory-tolerant than adults and that pruning has more negative effects than defoliation. Thus, seedling browsers may constrain recruitment in C. mopane, influencing its population dynamics and abundance.

Oviposition of a leaf-miner on Erythroxylum tortuosum (Erythroxylaceae) leaves: hierarchical variation of physical leaf traits

2012 ◽  
Vol 60 (2) ◽  
pp. 136 ◽  
Author(s):  
P. R. De Sibio ◽  
M. N. Rossi
Keyword(s):  
Leaf Area ◽  
Spatial Resolution ◽  
Fluctuating Asymmetry ◽  
Oviposition Preference ◽  
Leaf Size ◽  
Preference Test ◽  
Leaf Traits ◽  
Leaf Miner ◽  
Leaf Miners ◽  
Resolution Level

Plants do not offer homogeneous supplies of the resources required by herbivorous insects as many resource traits show considerable variation both within and between plants. The distribution of variation among host-plant attributes determines the optimal spatial resolution level for insect females to select the best resource patches for oviposition. In this study, we examine whether variation in fluctuating asymmetry and size of Erythroxylum tortuosum Mart. (Erythroxylaceae) leaves influence oviposition of the specialist leaf-miner Agnippe Chambers (Lepidoptera: Gelechiidae). By partitioning the variance across five hierarchical levels, the oviposition pattern was investigated at the spatial resolution level where these leaf traits varied the most. We confirm that the largest variation in both these leaf attributes occurs at the leaf level. We hypothesise that leaf-miner females will respond to this variation by selecting the best leaves (resources) on which to lay their eggs. We find that the probability of oviposition is not significantly related to fluctuating asymmetry or to leaf size (oviposition preference test), suggesting that these two physical traits are not relevant to leaf-miners as indicators of resource patch quality. Therefore, although we show that females laid significantly more eggs on larger leaves, this behaviour appears not to be a result of active selection of leaves. Our results suggest that Agnippe females probably adjust their oviposition proportionally to leaf area because the relationship between egg density and leaf area was not statistically significant.

Influence of Stem Diameter on Oviposition Preference of the Alfalfa Weevil and Its Importance in Breeding for Resistance 1

Crop Science ◽  
1967 ◽  
Vol 7 (5) ◽  
pp. 428-430 ◽  
Author(s):  
B. L. Norwood ◽  
D. K. Barnes ◽  
R. S. VanDenburgh ◽  
C. H. Hanson ◽  
C. C. Blickenstaff
Keyword(s):  
Oviposition Preference ◽  
Stem Diameter ◽  
Alfalfa Weevil ◽  
Breeding For Resistance
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