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Agarwala, B. K.
- Haemocyte Morphology and Differential Haemocyte Counts of Giant Ladybird Beetle, Anisolemnia dilatata (F.) (Coleoptera:Coccinellidae):A Unique Predator of Bamboo Woolly Aphids
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Authors
Affiliations
1 Department of Zoology, Tripura University, Suryamaninagar, Tripura 799 022, IN
1 Department of Zoology, Tripura University, Suryamaninagar, Tripura 799 022, IN
Source
Current Science, Vol 112, No 01 (2017), Pagination: 160-164Abstract
Changes in haemolymph characteristics such as differential counts of haemocytes have direct bearing on the general performance of insects. The present study was carried out to generate data on the morphology of different haemocytes and their differential counts of giant ladybird predator, Anisolemnia dilatata (F.), unique to woolly aphid pests of bamboo habitat. Five types of haemocytes, viz. prohaemocytes, plasmatocytes, granulocytes, spherulocytes and oenocytes were morphologically characterized in the haemolymph of larvae, pupae, virgin females and males. Among these, plasmatocytes were dominant followed by granulocytes, prohaemocytes, spherulocytes and oenocytes. Granulocytes showed consistency in numbers in all life cycle stages from first instar larva to adults of males and females of the giant ladybird.Keywords
Anisolemnia dilatata, Bamboo Habitat, Differential Haemocyte Count, Giant Coccinellid Predator, Woolly Aphids.Full Text
- Molecular Characterization of Ladybird Predators (Coleoptera: Coccinellidae) of Aphid Pests (Homoptera:Aphididae) in North East India
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Authors
Affiliations
1 Ecology and Biodiversity Laboratories, Department of Zoology, Tripura University, Suryamaninagar 799 022, IN
2 Division of Crop Protection, ICAR Research Complex for NEH Region, Umroi Road, Umiam (Barapani) 793 103, IN
1 Ecology and Biodiversity Laboratories, Department of Zoology, Tripura University, Suryamaninagar 799 022, IN
2 Division of Crop Protection, ICAR Research Complex for NEH Region, Umroi Road, Umiam (Barapani) 793 103, IN
Source
Current Science, Vol 113, No 09 (2017), Pagination: 1755-1759Abstract
Ladybird beetles are potential and promising biological control agents for the management of insect pests. These insects show variations in biological fitness in diverse habitats and subsequently in term of genotypes. We used cytochrome oxidase I (COI) gene sequences to study within-species genetic variation in four species of ladybird predators, viz. Coccinella transversalis (Fab.), Cheilomenes sexmaculata (Fab.), Micraspis discolor (Fab.) and Anisolemnia dilatata (Fab.) collected from different cultivated habitats of Tripura, North East India. Results of multiple sequence alignments of partial COI gene (553 bp) of mitochondrial origin showed 100% homology among different populations (within species) of three ladybird species. The molecular identity of M. discolor could not be established due to the absence of matching nucleotide sequence for this region of COI gene in the NCBI database. Three of the four populations of Micraspis species showed 100% homology in partial COI gene sequencing, but one representative population showed 52 nucleotide mutations, of which 1 mutation was found to result in the alteration of the codon from valine to isoleucine, and seemed to represent a different Micraspis species previously not known from NE India. This study shows that the three most common species of ladybird predators of aphid pests in NE India are fairly homogenous with respect to the COI gene, but species of Micraspis are genetically diverse and need further studies to address this issue.Keywords
Aphid Pests, Genetic Variation, Ladybird Beetles, Molecular Characterization.Full Text
References
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- Agarwala, B. K., Bardhanroy, P., Yasuda, H. and Takizawa, T., Prey consumption and oviposition of the aphidophagous predator Menochilus sexmaculatus (Coleoptera: Coccinellidae) in relation to prey density and adult size. Environ. Entomol., 2001, 30(6), 1182–1187.
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- Negative Allometry for Egg Size in Ladybeetles (Coleoptera:Coccinellidae):Trade-Off between Egg Hatch Time and Size
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Authors
Affiliations
1 Department of Zoology, Tripura University, Suryamaninagar, Tripura 799 022, IN
2 School of Biological Sciences, University of East Anglia, GB
1 Department of Zoology, Tripura University, Suryamaninagar, Tripura 799 022, IN
2 School of Biological Sciences, University of East Anglia, GB
Source
Current Science, Vol 113, No 12 (2017), Pagination: 2350-2353Abstract
Similar to a wide range of other organisms, large species of predatory ladybeetles lay proportionally small eggs when compared to smaller species. This study determines whether egg size in aphidophagous lady beetles is constrained by the time it takes for the eggs to hatch. The eggs of the large species, Anisolemnia dilatata (168 mg), and small species of ladybeetle, Coccinella septempunctata (27 mg), were collected immediately after they were laid, separated from one another and weighed. The time for the egg to hatch was determined at 22°C. As predicted, the eggs of the large species were a smaller proportion (0.0048) of their mother’s weight when compared to the eggs of the small species (0.0061). On an average, the eggs of the large species were about 4.9 times heavier and took 1.31 times longer to hatch than those of small species. These results indicate that in insects and aphidophagous ladybeetles, in particular, egg hatch time is not directly proportional to the egg size and reproduction may involve more than a trade-off between the number of eggs and size. It is likely that egg hatch time is a constraining factor and an important determinant of the inter-specific negative allometry for egg size in this group of insects.Keywords
Egg Size, Inter-Specific Negative Allometry, Ladybeetles.Full Text
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- Agarwala, B. K. and Dixon, A. F. G., Laboratory study of cannibalism and interspecific predation in ladybirds. Ecol. Entomol., 1992, 17, 303–309.
- Agarwala, B. K. and Dixon, A. F. G., Why do ladybirds lay eggs in clusters? Func. Ecol., 1993, 7, 541–548.
- Agarwala, B. K. and Bhowmik, P. J., Effect of chemical defence on the fitness of ladybird predator, Cheilomenes sexmaculata (Fabricius). J. Biol. Control, 2007, 21, 89–96.
- Inter-Specific Relationship of Size and Walking Speed in Predaceous Ladybirds (Insecta: Coleoptera: Coccinellidae)
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Authors
S. Ghosh
1,
B. K. Agarwala
1
Affiliations
1 Department of Zoology, Tripura University, Suryamaninagar, Tripura 799 022, IN
1 Department of Zoology, Tripura University, Suryamaninagar, Tripura 799 022, IN
Source
Current Science, Vol 115, No 1 (2018), Pagination: 141-146Abstract
Inter-specific relationships of size and walking speed were examined in five species of predaceous ladybird beetles of aphid prey from different habitats. Lengths of legs, weight and volume of body, and walking speed varied significantly among the five species of different sizes that were reared on their preferred prey food in uniform growth conditions. The species are Menochilus sexmaculata, Coccinella transversalis, Anisolemnia dilatata, Micraspis discolor and Scymnus sp. Lengths of legs and body sizes showed similar growth rates across the five species (isometry), but the giant ladybird species showed significantly higher positive allometry in body volume (allometric coefficient, α = 6.66) and significantly lower negative allometry in walking speed relative to body weight (α = 0.95) when compared to other species (α = 3.54). The unique response by the giant ladybird species in body form and speed may be attributed to its foraging habitat of perennial bamboo forests with large aggregations of non-winged aphid food which seem to favour the evolution of higher body volume and slower speed for giant size when compared to species of smaller sizes which usually forage for short-lived aphid colonies in seasonal and annual habitats of crop plants and weeds. Evidently, size (weight and volume) and speed matter in the evolution of life history attributes of predaceous ladybird beetles.Keywords
Evolutionary Allometry, Predaceous Ladybirds, Size and Speed.Full Text
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- Corrigendum:Inter-Specific Relationship of Size and Walking Speed in Predaceous Ladybirds (Insecta:Coleoptera:Coccinellidae)
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Authors
Source
Current Science, Vol 115, No 5 (2018), Pagination: 810-810Abstract
The following corrections are suggested in citations nos. 11 and 32.Full Text
- Annual Review of Entomology, 2022
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Authors
Affiliations
1 Active Acres, Flat 4F01, 54/10, D.C. Dey Road, Kolkata 700 015, IN
1 Active Acres, Flat 4F01, 54/10, D.C. Dey Road, Kolkata 700 015, IN
Source
Current Science, Vol 124, No 6 (2023), Pagination: 762-763Abstract
No Abstract.Keywords
No Keywords.Full Text