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Subject: Entomology × Author: Yogesh Kumar × End date: 2017 × Start date: 2010 × Type: Thesis × Thesis Type: Ph.D ×
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    ThesisItemOpen Access
    Biodiversity of insect pollinators and genetic variability in Apis mellifera L. in tarai region of Uttarakhand
    (G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2012-02) Yogesh Kumar; Bisht, R.S.
    The present investigation was carried out at G. B. Pant University of Agriculture and Technology, Pantnagar during 2010-11. The biodiversity of insect pollinators was explored on 29 different forage plant species whereas the foraging behaviour was studied on 14 forage plant species. The floral resources (major crops/plants and flowers) of insect pollinators were recorded in and around Pantnagar. Genetic variability of European honeybee, Apis mellifera was assessed using RAPD markers. A total of 49 species (under 23 genera and 10 families) of insect foragers were recorded. Of these, maximum number of 41 species belonged to the order Hymenoptera followed by Diptera (8 species). The hymenopteran included 33 non Apis bees species. The highest number of 26 insect species were found on mustard and vana tulsi each, whereas lowest number of 5 insect species were recorded to visit chick pea and chrysanthemum. In general, Apis bees, A. cerana A. mellifera and A. dorsata were observed as the most frequent pollinators which were found visiting all the 29 forage plants. Syrphus corollae (27 plants species) and Episyrphus balteatus (25 plants species) were the most frequent visitors among Diptera on the foraged plants. Studies on foraging behaviour of some common insect visitors revealed their that relative abundance, foraging rate and foraging speed varied with respect to different day hours irrespective to foraging plants. As many as 78 floral resources of insect pollinators in and around Pantnagar have been reported. It has been observed that out of 78 crops visited by different pollinators, 48 crops provided both nectar and pollen to the pollinators. Maximum number of 60 plants were foraged by insect pollinators to collect only nectar followed by 56 plant species which appeared to be foraged by insect pollinators to collect only pollen. The floral availability was maximum during March-May and low during July-August. Genetic variability in European honey bee, A. mellifera, has been also worked out using five RAPD primers. Based on the estimated genetic similarity matrix, the highest genetic similarity value (0.861) was noticed between the pair Jeolikote and Pantnagar while lowest genetic similarity value (0.375) was observed between Haldwani and Rajasthan. The major gene cluster consisted of 8 European honey bee, A. mellifera accessions from Haldwani, Almora, Dogaun, Jeolikote, Fatehpur, Ramnagar, Aligarh, Pantnagar, while the minor gene cluster comprised single accession from Rajasthan.
  • Thumbnail Image
    ThesisItemOpen Access
    Biodiversity of insect pollinators and genetic variability in Apis mellifera L. in Tarai region of Uttarakhand
    (G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2012-02) Yogesh Kumar; Bisht, R.S.
    The present investigation was carried out at G. B. Pant University of Agriculture and Technology, Pantnagar during 2010-11. The biodiversity of insect pollinators was explored on 29 different forage plant species whereas the foraging behaviour was studied on 14 forage plant species. The floral resources (major crops/plants and flowers) of insect pollinators were recorded in and around Pantnagar. Genetic variability of European honeybee, Apis mellifera was assessed using RAPD markers. A total of 49 species (under 23 genera and 10 families) of insect foragers were recorded. Of these, maximum number of 41 species belonged to the order Hymenoptera followed by Diptera (8 species). The hymenopteran included 33 non Apis bees species. The highest number of 26 insect species were found on mustard and vana tulsi each, whereas lowest number of 5 insect species were recorded to visit chick pea and chrysanthemum. In general, Apis bees, A. cerana A. mellifera and A. dorsata were observed as the most frequent pollinators which were found visiting all the 29 forage plants. Syrphus corollae (27 plants species) and Episyrphus balteatus (25 plants species) were the most frequent visitors among Diptera on the foraged plants. Studies on foraging behaviour of some common insect visitors revealed their that relative abundance, foraging rate and foraging speed varied with respect to different day hours irrespective to foraging plants. As many as 78 floral resources of insect pollinators in and around Pantnagar have been reported. It has been observed that out of 78 crops visited by different pollinators, 48 crops provided both nectar and pollen to the pollinators. Maximum number of 60 plants were foraged by insect pollinators to collect only nectar followed by 56 plant species which appeared to be foraged by insect pollinators to collect only pollen. The floral availability was maximum during March-May and low during July-August. Genetic variability in European honey bee, A. mellifera, has been also worked out using five RAPD primers. Based on the estimated genetic similarity matrix, the highest genetic similarity value (0.861) was noticed between the pair Jeolikote and Pantnagar while lowest genetic similarity value (0.375) was observed between Haldwani and Rajasthan. The major gene cluster consisted of 8 European honey bee, A. mellifera accessions from Haldwani, Almora, Do-gaun, Jeolikote, Fatehpur, Ramnagar, Aligarh, Pantnagar, while the minor gene cluster comprised single accession from Rajasthan.