![]() Egg clustering enhances the effect of surface chemical and stimulate non-sibling egg cannibalism and appears to reduce intraguild predation. The surface chemicals present on the eggs possibly act as feeding stimulants to conspecific neonates but not for heterospecific neonates. Surface chemicals appear to play a major role for the preference of conspecific eggs, as the ladybird behaviour was reversed when these chemicals were interchanged. Neonates of both species prefer to eat non-sibling conspecific eggs than heterospecific eggs, with higher preference in P. read more read lessĪbstract: The role of surface chemicals in egg cannibalism and intraguild predation by neonates of two aphidophagous ladybirds, Propylea dissecta and Coccinella transversalis were examined. Regression analysis revealed a positive correlation between: (1) daily prey consumption and relative growth rate, (2) adult weight and developmental rate, (3) weights of adult male and female, and (4) female longevity and fecundity.read more read lessĪbstract: Predation potential, development, immature survival and reproduction of an aphidophagous ladybeetle, Propylea dissecta (Mulsant) was studied when fed on seven aphid prey, viz Aphis gossypii, Aphis craccivora, Lipaphis erysimi, Uroleucon compositae, Brevicoryne brassicae, Rhopalosiphum maidis and Myzus persicae A gossypii was most suitable and consumed by the larvae and adults of P dissecta, while M persicae, the least Pre-imaginal development of P dissecta was fastest (0080 day−1) when A gossypii was used as prey, whilst slowest (0061 day−1) on M persicae The immature survival, adult emergence, adult male and female longevity of P dissecta was maximal (ie, 7710☐☐79%, 5710☑☑93 days, respectively) on A gossypii and minimal (ie, 6301☑☑79%, 4250☑☒32 days, respectively) when M persicae was provided as prey Oviposition period, fecundity, percent egg viability and mean reproductive rate was maximum (ie, 5030☒03 days, 856. Female reproduction was also prey quality dependent showing maximum reproductive performance in terms of fecundity and percentage viability, with a highest reproductive period and lowest non-reproductive period on A. gossypii and minimum (37.75, 2.18 and 60.69%, respectively) after feeding on A. transversalis was maximum (68.33, 7.82 and 88.21%, respectively) when larval instars consumed A. Immature survival, growth index and adult emergence of C. The total prey consumption by larva, adult male and female in their lifetime was maximum (665.30 ± 5.75, 4831.10 ± 123.30 ± 94.51, respectively) on A. gossypii (13.01 ± 0.18 days) and longest on A. The complete development was shortest on A. Significant effect of prey quality was observed on pre-imaginal developmental periods, wet weights and adult longevity. All of them were found to be essential prey, however the relative prey suitability varied. Aphis craccivora, Aphis gossypii, Aphis nerii, Myzus persicae, Lipaphis erysimi and Uroleucon compositae were provided as prey to the feeding stages of Coccinella transversalis (Fabricius). However, further field based studies are needed to confirm this hypothesis.read more read less sexmaculata is the best predator for the management of both prey species, particularly A. The potential role of these predators in biocontrol of A. Differences in coefficients of attack rates, however, did not vary significantly in most of the treatments. Differences in handling times were found to be significant within and between the predatory species on both prey species indicating that predators respond differentially to prey species. dissecta, in terms of consumption of the aphids, Aphis craccivora and Myzus persicae, with suitable values of coefficient of attack rates and handling times on these prey species. ![]() sexmaculata responded maximally, followed by C. The linear reciprocal transformation of Holling's disc equation was used to further evaluate the parametric values. All three predators exhibited a decelerating curve Type II response determined by a logistic regression model. Abstract: The functional response parameters and patterns of three coccinellid predators, Cheilomenes sexmaculata, Propylea dissecta, and Coccinella transversalis (Coleoptera: Coccinellidae) were evaluated to find out how these predators respond at two different prey species across various prey densities levels.
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