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2 documents found tagged predation [X]
  • Title
    A report on occurrence of aphidophagous predators of Aphis odinae (van der Goot) (Hemiptera: Aphididae) in cashew ecosystem from Goa, India
    Type
    Journal Article
    Description
    The aphid, Aphis odinae(Van der Goot) (Hemiptera: Aphididae) is a polyphagous, occasional insect pest of cashew. A field survey was conducted from 2014 to 2015 in cashew plantations to record the incidence of aphid and its predators. Periodical sampling revealed, the occurrence of six species of aphidophagous predators comprising three species of coccinellids, viz., Scymnus castaneus Sicard, Cheilomenes sexmaculata (Fabricius) and Pseudaspidimerus flaviceps (Walker) and three species of syrphids, viz., Paragus serratus (Fabricius), Dideopsis aegrota (Fabricius) and Ischidon scutellaris (Fabricius) were found predating on A. odinae. All the immature stages of predators were found predating on first, second, third and fourth instars of the aphid. Among the coccinellids, the dominant species were S. castaneus (4.26 grubs/nut) followed by C. sexmaculata (0.42 grubs/leaf) and P. flaviceps (0.14 grubs/nut). Of the syrphids, P. serratus 2.39 larvae/nut was the major predator. The species D. aegrota (1.2 larvae/leaf) and I. scutellaris (0.5 larvae/nut) were recorded as minor predators. Seasonal abundance of predators was synchronized with the aphid with a maximum occurrence during February 2015. The aphid population gradually reduced from April onwards due to the voracious feeding activity of the predators. The study concluded that the aphidophagous predators, viz., coccinellids and syrphids play a major role in managing the aphid A. odinae in cashew and could be encouraged for augmentation and conservation of these predators in a cashew based ecosystem.
    Attribution
    Ramasamy Maruthadurai & Narendra Pratap Singh, Journal of Threatened Taxa, Vol 9, No 2 (2017); pp. 9858–9861 http://dx.doi.org/10.11609/jott.2435.9.2.9858-9861
  • Title
    Population and roosting behaviour of Barn Swallows Hirundo rustica wintering in Jamshedpur, Jharkhand, India
    Type
    Journal Article
    Description
    Population size and roosting behaviour of Barn Swallow Hirundo rustica a non-breeding winter visitor was studied from September 2006 to April 2008 in Jamshedpur, Jharkhand (India). The swallows first appeared in the month of September after which their populations increased till December. The maximum numbers recorded were 15,300 in 2006 and 16,700 in 2007. Their departure commenced in early March and most of them had left by mid-April. During their stay, large numbers of swallows roost gregariously in overhead wires in the town. Routes in these areas were illuminated throughout night, which probably helped them to detect predators easily. The observed roosting time varied between 13 and 28 minutes after sunset. It was found that availability of light and ambient temperature were the most important factors which determined the roosting time and duration.
    Attribution
    Verma S.K. (2010). Journal of Threatened Taxa 2(2) pp. 721-723; doi:10.11609/JoTT.o2161.721-3