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Bindu T.N.,Kerala Forest Research Institute | Bindu T.N.,Wildlife Research and Conservation Trust | Balakrishnan P.,Wildlife Research and Conservation Trust | Balakrishnan P.,University of Calicut | And 2 more authors.
Ecological Entomology | Year: 2012

1. Field populations of the teak defoliator larvae, Hyblaea puera Cramer exhibit colour polyphenism under different population densities: greyish-green with black- and orange-coloured dorsal bands in low-density endemic populations and uniformly black or intermediate colour during high-density population. 2. The density dependence of colour polyphenism was confirmed by field monitoring of H. puera populations during 2008-2010. 3. The above findings were later substantiated by rearing H. puera larvae under different densities (i.e. solitary and crowded in the laboratory). Ninety one per cent of the solitary reared laboratory population developed bright coloration whereas, 92% of the group reared larvae turned to black. Eight per cent of larvae from both the rearing densities were of intermediate colour. 4. Density-dependent resistance build-up against H. puera nucleopolyhedrovirus by H. puera were tested using the fifth instar larvae. The results showed three-fold increase of median lethal dose (LD50) value for the group reared larvae (5332 polyhedral occlusion bodies/larvae) compared to the solitary reared ones (1727 polyhedral occlusion bodies/larva) and also significant difference for the mean time to death (3.6 and 3.3 days, respectively). 5. The study revealed the strong influence of larval density on H. puera larval melanism and resistance build-up against H. puera nucleopolyhedrovirus. © 2012 The Royal Entomological Society.

Bindu T.N.,Kerala Forest Research Institute | Sajeev T.V.,Kerala Forest Research Institute | Sajeev T.V.,Wildlife Research and Conservation Trust | Sudheendrakumar V.V.,Kerala Forest Research Institute | Sudheendrakumar V.V.,Wildlife Research and Conservation Trust
Journal of Entomological Research | Year: 2011

Present study is an attempt to quantify the severity of the viral epizootics occurred in natural population of the serious teak pest, the teak defoliator, Hyblaea puera (Cramer). During 2 years of systematic sampling it was found that the infected larvae were of later instars viz., third, fourth and fifth and infestation ranged from 50% to 89.7%. The differential Giemsa staining of the insect tissues in the laboratory revealed the presence of insect polyhedra.

Nishadh K.A.R.,Center for Conservation Ecology | Nishadh K.A.R.,Wildlife Research and Conservation Trust | Nishadh K.A.R.,Salim Ali Center for Ornithology and Natural History | Anoop Das K.S.,Center for Conservation Ecology | Anoop Das K.S.,Wildlife Research and Conservation Trust
International Journal of Conservation Science | Year: 2014

Studying small confined habitat has two fold advantages for ecological research. Firstly, its importance as habitat to a micro-ecosystem, and secondly its applications in experimental research. Tree-hole aquatic habitat is such a habitat having a considerable importance as micro - habitat for numerous significant species, especially for disease spreading invertebrates, which act as model systems as they have tractability and generality at laboratory scale studies. This review highlights profiles of tree-hole aquatic habitats and ecological relationships of its inhabitants supported by experimental evidences in peninsular India.

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