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Role of Non-Cultivated Flowering Plants in Conservation of Pollinators

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Role of Non-Cultivated Flowering Plants in Conservation of Pollinators International Journal of Environment and Climate Change 10(6): 75-81, 2020; Article no.IJECC.56878 ISSN: 2581-8627 (Past name: British Journal of Environment & Climate Change, Past ISSN: 2231–4784) Role of Non-cultivated Flowering Plants in Conservation of Pollinators Zameeroddin1* and V. V. Belavadi1 1Department of Entomology, University of Agricultural Sciences, Gandhi Krishi Vigyan Kendra, Bangalore - 560065, India. Authors’ contributions This work was carried out in collaboration between both authors. Both authors read and approved the final manuscript. Article Information DOI: 10.9734/IJECC/2020/v10i630206 Editor(s): (1) Dr. Alice Maria Correia Vilela, University of Trás-os-Montes and Alto Douro, Portugal. Reviewers: (1) Lorna T. Enerva, Polytechnic University of the Philippines, Philippines. (2) Ioana Stanciu, University of Bucharest, Romania. (3) Nayanny De Sousa Fernandes, Universidade Federal do Ceará, Brazil. Complete Peer review History: http://www.sdiarticle4.com/review-history/56878 Received 03 March 2020 Accepted 09 May 2020 Original Research Article Published 25 May 2020 ABSTRACT A study was conducted to emphasize the importance of non-cultivated plants/weeds in North Bangalore, Karnataka from October 2014 to March 2015 in three locations. The pollinators were collected using sweep net method on cultivated and non-cultivated flowering plants. A total of 22 non-cultivated plant species and 11 cultivated plant species were observed on which 85 and 56 pollinator species were collected respectively belonging to the four families (Apidae, Halictidae, Megachilidae and Scoliidae) of Hymenoptera and two families (Syrphidae and Bombyliidae) of Diptera. It is found that association of pollinators were more towards non-cultivated plants than cultivated plants. Among cultivated flowering plants, Ocimum americanum was highly attractive followed by Field bean and Lavandula angustifolia. Among non-cultivated flowering plants, Alternanthera sessilis was highly attractive on which majority were Dipterans followed by Leucas aspera and Hyptis suaveolens indicating the importance of non-cultivated flowering plants/weeds in conservation of pollinators. Keywords: Non-cultivated; cultivated; pollinator; conservation. _____________________________________________________________________________________________________ *Corresponding author: E-mail: [email protected]; Zameeroddin and Belavadi; IJECC, 10(6): 75-81, 2020; Article no.IJECC.56878 1. INTRODUCTION 2.3 Sweep-net Sampling Pollinator provides an importance ecosystem Flower visitors were collected by direct netting on service. Leading 87 global food crops are entirely flowering plants using an insect sweep net. The or partly dependent on animal pollination and net consisted of 75 cm long handle with a 30 cm that these crops make up 35 per cent of the dia hoop fitted with a mesh bag of 60 cm depth. global food production [1]. Insects that visit flower Sweep net samples were made approximately provide an important ecosystem function to 300 m away from the site where bee bowls were global crop production through their pollination placed in the selected location. A total of six services [2]. Potential risk to crop production has hours of active sampling was done on each emerged as pollinator declining globally due to sampling day at each site of sampling. Sampling agricultural intensification [3] and habitat was done on consecutive days in the three fragmentation [4]. A plant and its pollinator have locations. Three samples per month with an a mutualistic relationship. Pollinators depend on interval of ten days were taken. The sampling floral resources for their food, on either mass effort in terms of time spent was constant for flowering crops or weeds. It has been each location. Sweeps were made randomly on established that pollinators are essential for the flowering plants to collect all insects visiting survival and reproduction of several wild plant flowers or hovering near flowers of any flowering species also. The mass flowering of crops plant in the area irrespective of whether the plant reduces the time for pollinator visits in contrast was a weed or a cultivated species. The weeds has less flowers but present constantly collected insects were transferred to a killing jar and timely to pollinators. In conflict to farmers, containing ethyl acetate. The specimens were weeds may reduce the yield of crops, but weeds brought to the laboratory, pinned, labelled and also maintain pollinators and provide the dried for further identification. All specimens have ecosystem services, therefore presence of been deposited in the department of Entomology, weeds in the farm also benefits the farmer. As UAS, GKVK, Bangalore. pollinators enhance the crop yield, at least for 2.4 Record of Bee Flora some annual crop [5] and many plant species, mainly weeds, found in natural and In order to gain insight into the pollination habits semi-natural habitats are food resources for of the pollinators and to determine the spectrum honeybees [6] as well as wild, solitary bees, the of different pollinator species visiting the blossom loss of such natural habitats therefore, of plant. All the flowering plants (cultivated and regarded as the primary cause for decline non - cultivated plants) visited by pollinators were of wild pollinators with both a decrease in nesting recorded along with the pollinator species visited and foraging sites [7,8]. Therefore, this in rural, peri-urban and urban area. The study emphasis on importance of non-cultivated pollinator flora was identified with the help of plants/weeds for the conservation of experts in the Botanical Garden, UAS, GKVK, pollinators. Bangalore. The floral resources were divided in to three categories based on number of species 2. MATERIALS AND METHODS attracted: 2.1 Study Area Highly Attractive : > 10 species Attractive : 6-10 species The study was conducted at North Bangalore in Less Attractive : 1-5 species Karnataka. Accordingly, three locations viz., Sadahalli, Gandhi Krishi Vigyan Kendra campus 3. RESULTS AND DISCUSSION and Hebbal were selected for the collection of This study describes the importance of pollinators. weeds/non-cultivated flowering plants, which helps to harbor the pollinators and help the crop 2.2 Methodology for better pollination and fruit set. A total of 33 plant species were observed of which 22 species Sweep net method of sampling was followed. were non-cultivated plants and 11 species were Sampling was done at monthly intervals from cultivated plants on which pollinators were October, 2014 till March 2015. In each month collected. In total 85 and 56 pollinator species three samples were taken at each location with a were collected from non-cultivated and cultivated total of 54 samples. flowering plants respectively belonging to the 76 Zameeroddin and Belavadi; IJECC, 10(6): 75-81, 2020; Article no.IJECC.56878 four families (Apidae, Halictidae, Megachilidae removed from the agroecosystem that may lead and Scoliidae) of Hymenoptera and two families to the decline of native pollinators [10,11]. (Syrphidae and Bombyliidae) of Diptera (Table Species of Apidae were found to be associate 1). similar on cultivated and non-cultivated flowering plants due to more attractive nature of cultivated 3.1 Association of Pollinators with Non- crops like, Field bean and Ocimum americanum cultivated and Cultivated Flowering (Fig. 1). Plants 3.2 Number of Pollinators Attracted to It was evident that the rich diversity of pollinators Non-cultivated and Cultivated were related to the availability of floral plant but Flowering Plants due to Agricultural intensification, landscape biodiversity for pollinators decreased [9] making One pollinator to one plant species relationship weeds a significant part of the remaining floral are very rare in plant-pollinator interaction. More diversity. The overall association of pollinators often plants have pollination syndrome directed were found to be more towards non-cultivated towards broader pollinator groups. In the study flowering plants than cultivated flowering plants. flowering plant were broadly classified in to The members of family Bombyliidae were highly attractive (> 10 species), attractive (6-10 observed only on non-cultivated flowering pants, species), less attractive (1-5 species). Among similarly species of Halictidae, Scoliidae and cultivated flowering plants, Ocimum americanum Syrphidae were found to be higher towards non- found to be highly attractive with 43 species cultivated flowering plants. In contrast if these which majorly include 18 species of Apidae non-cultivated flowering plants/weeds are and 15 species of Megachilidae as it is evident, Table 1. Pollinator species collected on non-cultivated/weeds and cultivated flowering plants from October 2014 to March 2015 Order Family Pollinator species Collected on non-cultivated Collected on cultivated Plants Plants Hymenoptera Apidae 18 25 Halictidae 15 8 Megachilidae 17 17 Scoliidae 8 2 Diptera Syrphidae 16 4 Bombyliidae 11 0 Total 85 56 1.2 n o i 1 t u b 0.8 i r t s 0.6 i d l 0.4 a n o 0.2 i t r o 0 p o r P Non-cultivated flowering plants Cultivated flowering plants Fig. 1. Proportional distribution of pollinator families on non-cultivated and cultivated flowering plants 77 Zameeroddin and Belavadi; IJECC, 10(6): 75-81, 2020; Article no.IJECC.56878 Table 2. Number of pollinators attracted to non-cultivated and cultivated flowering plants. Highly attractive (> 10 species), attractive (6-10 species), less attractive (1-5 species) Host Apidae Halictidae Megachilidae Scolidae Syrphidae Bombyliidae Total Bitter gourd (Momordica charantia) 3 0 0 0 1 0 4 Cucumber (Cucumis sativus) 5 0 0 0 0 0 5 Field bean (Vicia faba) 18 3 2 0 0 0 23 Lavandula angustifolia 7 0 13 0 2 0 22 Muskmelon (Cucumis melo) 3 1 0 0 1 0 5 Ocimum americanum 18 7 15 2 1 0 43 Redgram (Cajanus cajan) 9 1 5 0 0 0 15 Ricebean (Vigna umbellata) 5 1 6 0 0 0 12 Sponge gourd (Luffa aegyptiaca) 5 1 0 0 0 0 6 Watermelon (Citrullus lanatus) 5 3 0 0 4 0 12 Jasminum officinale 3 0 0 0 0 0 3 78 Zameeroddin and Belavadi; IJECC, 10(6): 75-81, 2020; Article no.IJECC.56878 Table 3.
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