Bibliografie tematiche / Insect pollination

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Letteratura scientifica selezionata sul tema "Insect pollination"

Autore: Grafiati
Pubblicato: 4 giugno 2021
Ultima modifica: 21 febbraio 2023

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Articoli di riviste sul tema "Insect pollination"

1

Alfawwaz, Muhammad Dzaky, Agus Dana Permana e Ramadhani Eka Putra. "Diversity and Abundance of Insects Pollinator of Chayote (Sechium edule (Jacq.) Swartz". Jurnal Biodjati 7, n. 1 (30 maggio 2022): 36–44. http://dx.doi.org/10.15575/biodjati.v7i1.13881.

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Abstract (sommario):
Chayote plants (Sechium edule) with monoecious characters require a pollination process. The pollination process requires pollinating agents to increase its productivity, one of which is insects. This research aimed to determine the diversity and abundance of insects pollinator on chayote plants. Observation of diversity and abundance used a scan sampling method. Pollinator insects observations were carried out in 3 time periods, morning, afternoon, and evening on male and female flowers. We measured environmental parameters such as temperature, humidity, wind speed, and light intensity. Eight species of wild insects pollinated chayote flowers, Apis cerana, Apis dorsata, Lasioglossum leucozonium, Polistes sagittarius, Phimenes flavopictus, Campsomeriella annulata, Lucilia sericata, and Musca domestica. The insect pollinators community had moderate diversity (1.23), a relatively dynamic community (0.59), and moderate dominance (0.62), with A. cerana, which had been the dominant insect pollinator with a relative abundance of 61.63%. Musca domestica and L. sericata were (0,58%) the least dominant insect pollinator with a relative abundance of 0.58%. This research concludes that the insects pollinator of chayote has a moderate level of diversity, relatively dynamic community, and average dominance.
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2

Eeraerts, Maxime, Lieve Borremans, Guy Smagghe e Ivan Meeus. "A Growers’ Perspective on Crop Pollination and Measures to Manage the Pollination Service of Wild Pollinators in Sweet Cherry Cultivation". Insects 11, n. 6 (15 giugno 2020): 372. http://dx.doi.org/10.3390/insects11060372.

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Abstract (sommario):
Recent declines in insect pollinators and the increasing dependence on insect pollination in agriculture present major challenges to ensuring future food production. As part of the effort to deal with this challenge, there is a pressing need to understand growers’ perceptions with regard to pollinator diversity and crop pollination management. At present, many growers are dependent on domesticated honey bees (Apis mellifera), however, targeted management strategies involving naturally occurring pollinator species might be necessary to ensure future crop pollination. In this study we used semi-structured interviews to explore growers’ knowledge about crop pollination and current practices to manage insect pollination in sweet cherry cultivation. Our findings suggest that growers have a clear understanding of the importance of pollination and its determining factors. However, with respect to their current pollination management, growers depend mainly on honey bees and only apply measures to enhance wild pollinator communities to a limited extent. Our study highlights the gap between the growers’ perception of the contribution of wild pollinators to crop pollination, and their efforts to manage these species. We conclude that this is due to a lack of communication of recent scientific findings on the contribution of pollinating insects to crop pollination through the information channels that are being used by growers today. It is therefore crucial that scientists, government and other stakeholders work together with growers and communicate scientific evidence as well as practical guidelines to growers.
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3

NUGROHO, ARI, TRI ATMOWIDI e SIH KAHONO. "Diversitas Serangga Penyerbuk dan Pembentukkan Buah Tanaman Kakao (Theobroma cacao L.)". Jurnal Sumberdaya Hayati 5, n. 1 (24 giugno 2019): 11–17. http://dx.doi.org/10.29244/jsdh.5.1.11-17.

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Cocoa (Theobroma cacao L.) is an entomophilous plant which is need insects for pollination. Pollinator insects increase cocoa’s fruit set. The aim of this research were to study diversity of pollinator insects, visiting activity of fly, Forcipomyia (Diptera), and fruit set of cocoa. Observation of pollinator insects was conducted by scan sampling method. Visiting activity of Forcipomyia were observed based on duration visit per flower, number of flowers visited per minute, and duration of activity on flowers. Pollen load on body of Forcipomyia were measured. Pollination effectiveness of insect were measured from the number and size of the cocoa fruit. Result showed that 19 species of insects visitors on cocoa flowers were observed. Nine species are pollinator of cocoa’s plants i.e. Forcipomyia, Cecidomyia, Stilobezzia, Drosophila, Orimarga, Dolichoderus, Pheidole, Megachile, and Nomia. Cocoa pollination by insects produced 3% fruit higher than flowers without insect pollination. Pollination by insects produced size and weight of fruit, and number of seed per fruit were higher than pollination without insects.
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Kusuma, Ramadhani Mahendra, e Wiwin Windriyanti. "Effective Behavior of Insects Pollinators of Flowers in Gadung Mango Clone 21 Variety". Jurnal Ilmu Pertanian Indonesia 27, n. 4 (25 ottobre 2022): 596–605. http://dx.doi.org/10.18343/jipi.27.4.596.

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Abstract (sommario):
Pollinating insects are referred as support services, namely services by the processes in the ecosystems that support human well-being by maintaining or enhancing ecosystem services. The availability of flowers, diversity, and behavior of visiting pollinator insects affect the effectiveness of pollination to increase the formation of fruit sets of mango plants. The purpose of this study is to observe the behavior of pollinator insects visiting the mango gadung clone 21 varieties and their effectiveness in increasing the formation of fruit sets. Research has been carried out on two flower seasons: March-May (Off season) and July-September (On season) 2020. Visiting behaviors observed were the number of visits per minute (foraging rate) and the length of visit per flower (flower handling time). Pollination effectiveness was measured from the number of fruit sets formed from the open flower panicles and confined with a tangerine gauze. The results of the study obtained seven species including Apis sp., Trigona sp., Xylocopa sp., Polistes sp. 1, Polistes sp. 2, Chrysomya sp., and Eristalis sp. Visits of pollinating insects on the highest number of mango panicle flowers were (31.69 ± 7.69) flowers / 60 seconds by Trigona sp insects, and the lowest numbers were (2.70 ± 0.67) flowers / 60 seconds by Eristalis sp. insects. The longest visits of pollinator insects on mango flowers were obtained by Eristalis sp for (25.3 ± 8.50) sec/individual/flower and the shortest visits were by Trigona sp for (1.8 ± 0.63) seconds/individual/flower. Insect pollination increases fruit formation by 267.5%. Keywords: insect visits, pollinating insects, fruit formation, gadung 21 varieties mango
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5

Kleiman, Blaire M., Suzanne Koptur e Krishnaswamy Jayachandran. "Weeds Enhance Pollinator Diversity and Fruit Yield in Mango". Insects 12, n. 12 (13 dicembre 2021): 1114. http://dx.doi.org/10.3390/insects12121114.

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Abstract (sommario):
Agriculture is dependent on insect pollination, yet in areas of intensive production agriculture, there is often a decline in plant and insect diversity. As native habitats and plants are replaced, often only the weeds or unwanted vegetation persist. This study compared insect diversity on mango, Mangifera indica, a tropical fruit tree dependent on insect pollination, when weeds were present in cultivation versus when they were removed mechanically. The pollinating insects on both weeds and mango trees were examined as well as fruit set and yield in both the weed-free and weedy treatment in South Florida. There were significantly more pollinators and key pollinator families on the weedy mango trees, as well as significantly greater fruit yield in the weedy treatment compared to the weed-free treatment. Utilizing weeds, especially native species, as insectary plants can help ensure sufficient pollination of mango and increase biodiversity across crop monocropping systems.
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Reyes, Hortensia Cabrera, David Draper e Isabel Marques. "Pollination in the Rainforest: Scarce Visitors and Low Effective Pollinators Limit the Fruiting Success of Tropical Orchids". Insects 12, n. 10 (23 settembre 2021): 856. http://dx.doi.org/10.3390/insects12100856.

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Abstract (sommario):
A single plant might be visited by many flower visitors but not all might act as pollinators. Legitimate pollinators might also differ considerably in their efficiency, limiting pollination success. Unsuitable climatic conditions such as rain also affect pollinator activity. However, in the evergreen rainforest there is no prolonged dry season and flowering occurs usually under rain. Here, we explore the dependence on pollinators and the efficiency of flower visitors for the fruiting success of 10 Andean rainforest orchids. All species were self-compatible but strictly pollinator-dependent. Overall, we found low levels of fruit set in control flowers while experimental geitonogamous and cross-pollinations increased fruit set, revealing extensive pollination limitation in all populations. Seed viability dropped considerably after self and geitonogamous pollinations suggesting the possibility of early-acting inbreeding depression. Even though we monitored flower visitors on an extensive survey, few visitors were seen in these species and even fewer acted as legitimate pollinators. Thus, even though orchid pollination might be extremely diversified, these results show that few visitors are pollinating these species, explaining the low levels of fruit set recorded in the area studied.
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7

Allifah AF, Asyik Nur, Farida Bahalwan e Nur Alim Natsir. "Keanekaragaman Dan Kelimpahan Serangga Polinator Pada Perkebunan Mentimun (Cucumis sativus L) Desa Waiheru Ambon". Biosel: Biology Science and Education 9, n. 1 (31 maggio 2020): 26. http://dx.doi.org/10.33477/bs.v9i1.1314.

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Abstract (sommario):
Pollinator insects are insects that play a role in pollination, namely intermediaries pollinating plants. The purpose of this study was to determine the abundance and diversity of insects pollinators in the Cucumber (Cucumis sativus L) Plantation of Waiheru Village, Baguala District, Ambon City. Sampling was done by purposive sampling using a yellow glue trap (Yellow sticky trap). The customer observations are made in visual control. Observation starts at 07.00 WIT until 18.00 WIT which is divided into 3 time periods, namely: 07.00-10.00 WIT, 11.00-14.00 WIT and 15.00-18.00 WIT. The data obtained were analyzed using the diversity index (H ') according to Shannon and Wiener. The results showed that the total abundance of pollinator insects in vegetable plantations was 1220 individuals, consisting of 3 orders and 5 families. Insect families that play a role in the process of pollination are Family Apidae, Formicidae, Syrpidae, Muscidae and Papilionidae. The highest abundance of insects is dominated by the Formicidae Family while the lowest abundance is the Papilionidae Family. Value insect pollinator diversity found among the sites that H '= 1.21 which indicates that the level of diversity of insect pollinators on plantations Cucumber (Cucumis sativus L) in the Waiheru Village, Baguala District, Ambon City in the medium category.
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8

Wayo, Kanuengnit, Chama Phankaew, Alyssa B. Stewart e Sara Bumrungsri. "Bees are supplementary pollinators of self-compatible chiropterophilous durian". Journal of Tropical Ecology 34, n. 1 (gennaio 2018): 41–52. http://dx.doi.org/10.1017/s0266467418000019.

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Abstract:Nocturnally foraging insects may be supplementary pollinators to chiropterophilous plant species when bats are scarce. Given that insects are much smaller than bats, they may be more effective at transferring pollen for plant species with similar stamen and pistil lengths, such as the ‘Monthong’ durian cultivar. The present study clarifies the role of insects in pollinating the ‘Monthong’ cultivar by examining the floral biology, conducting pollination treatments on 19 trees and observing floral visitors in southern Thailand. Stigmas were receptive by 17h00, and over 50% of ‘Monthong’ anthers had dehisced by 17h30. Several bee species began foraging on flowers during the late afternoon, and the giant honey bee (Apis dorsata) continued to visit throughout the night. Our results show that at 4 wk after pollination, the highest fruit set occurred from hand-crossed pollination (13.5%), followed by open pollination (5.5%), insect pollination (3.3%) and automatic autogamy (2.0%), indicating that this cultivar is highly self-incompatible. Moreover, insects appear to be important pollinators of ‘Monthong’ durian in areas where nectar bats visit infrequently. One bee species in particular,Apis dorsata, commonly foraged on flowers at dusk and appears to be the most effective insect pollinator of durian. Our findings highlight that nocturnally foraging bees are capable of securing pollination for night-blooming plant taxa, even those typically considered to be bat-pollinated.
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Labandeira, Conrad C. "The Paleobiology of Pollination and its Precursors". Paleontological Society Papers 6 (novembre 2000): 233–70. http://dx.doi.org/10.1017/s1089332600000784.

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Abstract (sommario):
Perhaps the most conspicuous of associations between insects and plants is pollination. Pollinating insects are typically the first and most obvious of interactions between insects and plants when one encounters a montane meadow or a tropical woodland. The complex ecological structure of insect pollinators and their host plants is a central focus within the ever-expanding discipline of plant-insect interactions. The relationships between plants and insects have provided the empirical documentation of many case-studies that have resulted in the formulation of biological principles and construction of theoretical models, such as the role of foraging strategy on optimal plant-resource use, the advantages of specialized versus generalized host preferences as viable feeding strategies, and whether “pollination syndromes” are meaningful descriptions that relate flower type to insect mouthpart structure and behavior (Roubik, 1989; Ollerton, 1996; Waser et al., 1996; Johnson and Steiner, 2000). Much of the recent extensive discussion of plant-insect associations has centered on understanding the origin, maintenance, and evolutionary change in plant/pollinator associations at ecological time scales and increasingly at longer-term macroevolutionary time intervals (Armbruster, 1992; Pellmyr and Leebens-Mack, 1999). Such classical plant-insect association studies—cycads and cycad weevils, figs and fig wasps, and yuccas and yucca moths—were explored at modern time scales and currently are being examined through a long-term geologic component that involves colonization models based on cladogenetic events of plant and insect associates, buttressed by the fossil record (Farrell, 1998; Pellmyr and Leebens-Mack, 1999; A. Herre,pers. comm.). In addition to tracing modern pollination to the earlier Cenozoic and later Mesozoic, there is a resurgence in understanding the evolutionary history of earlier palynivore taxa (spore, prepollen and pollen consumers), which led toward pollination as a mutualism (Scott et al., 1992).
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Li, Nannan, Yizhao Huang, Wei Li e Shufa Xu. "Virome Analysis Reveals Diverse and Divergent RNA Viruses in Wild Insect Pollinators in Beijing, China". Viruses 14, n. 2 (24 gennaio 2022): 227. http://dx.doi.org/10.3390/v14020227.

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Abstract (sommario):
Insect pollinators provide major pollination services for wild plants and crops. Honeybee viruses can cause serious damage to honeybee colonies. However, viruses of other wild pollinating insects have yet to be fully explored. In the present study, we used RNA sequencing to investigate the viral diversity of 50 species of wild pollinating insects. A total of 3 pathogenic honeybee viruses, 8 previously reported viruses, and 26 novel viruses were identified in sequenced samples. Among these, 7 novel viruses were shown to be closely related to honeybee pathogenic viruses, and 4 were determined to have potential pathogenicity for their hosts. The viruses detected in wild insect pollinators were mainly from the order Picornavirales and the families Orthomyxoviridae, Sinhaliviridae, Rhabdoviridae, and Flaviviridae. Our study expanded the species range of known insect pollinator viruses, contributing to future efforts to protect economic honeybees and wild pollinating insects.
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Più fonti

Tesi sul tema "Insect pollination"

1

Cunnold, Helen Elizabeth. "Distinguishing pollination from visitation : the value of a pollinator effectiveness and pollinator importance network". Thesis, University of St Andrews, 2018. http://hdl.handle.net/10023/16121.

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Abstract (sommario):
For over twenty years, flower-visitation networks have been used to assess the effects of pollinator decline, linked to habitat loss, climate change and invasive species, on entire communities. However, most rely on flower visit frequency as a proxy for pollination; very few sample pollen from flower visitor's bodies or from stigmas and so do not include a quantitative measure of pollination success. Here, I add pollinator effectiveness (as single visit pollen deposition) into a traditional flower visitation network, creating a pollinator importance network that better evaluates the flower visitor community from the plant's perspective. Given recent interest in pollination in urban areas, I use an urban garden habitat, and compare visitation, pollen transport and pollinator importance networks, giving several novel conclusions. Firstly, although there are similarities in the structure of my networks, interactions were most specialised in the pollinator importance network, with pollen transport proving to be a better proxy for pollinator importance than visitation alone. Secondly, the specialisation of individual plants and the role of individual flower visitors varied between the networks, suggesting that community-level patterns in simple visitation networks can mask important individual differences. Thirdly, the correlation between flower visit frequency and pollinator importance largely depends on bees, and may not hold in plant-pollinator communities that are not bee-dominated. Fourthly, heterospecific pollen deposition was relatively low, despite the unusually diverse plant community of a garden. Finally, bees (particularly Bombus and non-eusocial halictids) carried the largest pollen loads and were the most effective at depositing pollen on to the stigma during a single visit in this garden habitat. The implications of this thesis highlight the strengths and limitations of each network for future studies, and raise important questions for the future of urban pollination studies.
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2

Gryj-Rubenstein, Ellen Orli. "Conflicting forces shaping reproductive strategies of plants : florivory and pollination /". Thesis, Connect to this title online; UW restricted, 1999. http://hdl.handle.net/1773/5126.

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3

Robinson, Samuel Victor Joseph. "Insect pollination and experimental warming in the High Arctic". Thesis, University of British Columbia, 2014. http://hdl.handle.net/2429/46539.

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Abstract (sommario):
As climate change causes retreats in Arctic glaciers, it is important to understand the mechanics of growth and community change in Arctic plant communities. Arctic plants have been shown to respond to observed and experimental changes in temperature by altering their reproductive strategies, growth, and phenology. Researchers have used open-top chambers (OTCs) to experimentally alter the near-surface air temperatures of tundra plant communities over long periods of time, but these devices may exclude insect pollinators to flowers during crucial periods of pollen reception. Insect pollination in the context of OTCs and Arctic plants is therefore important to understand, but has been poorly researched. I altered pollination of Salix arctica, Dryas integrifolia, and Papaver radicatum inside and outside of OTCs in a High Arctic shrub community, and conducted targeted insect netting to understand the dynamics of the visiting insect community. I also conducted bowl trapping inside and outside of OTCs to gauge their effect on insect availability to receptive flowers. OTCs altered the timing of flowering in Arctic plants, and significantly reduced the availability of pollinators to available flowers. However, I found that while both warming and pollination can alter flower and seed production in the study species, pollination is largely independent of OTC warming. Early-flowering species have the potential to be most affected by OTC-induced insect exclusion. The most common visiting insects were flies of the families Syrphidae and Muscidae, with occasional bumblebees (Bombus polaris). Papaver radicatum was by far the most heavily-visited flower, and I showed that the Syrphidae visit the flower preferentially at low temperatures, likely for warmth as well as pollen. I discuss these results in context with the current literature on Arctic plant and insect communities, and make recommendations for future research.
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4

Osborn, Heather. "THE INTERACTION OF HERBIVORY AND POLLINATION". OpenSIUC, 2019. https://opensiuc.lib.siu.edu/dissertations/1705.

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Abstract (sommario):
The interaction of herbivory and pollination is not well understood. Both topics on their own have been studied thoroughly, yet their interaction has not. Until the 1990s, few studies attempted to explore how herbivory might affect pollination, and vice versa.
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5

Cerqueira, Nicole. "Pollinator visitation preference on native and non-native congeneric plants". Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file 2.91 Mb., 84 p, 2005. http://wwwlib.umi.com/dissertations/fullcit/1428175.

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6

Dicks, Lynn V. "The structure and functioning of flower-visiting insect communities on hay meadows". Thesis, University of Cambridge, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.249064.

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7

Husman, Stephen H., e Michael J. Ottman. "Growing Alfalfa for Seed in Arizona". College of Agriculture, University of Arizona (Tucson, AZ), 2015. http://hdl.handle.net/10150/552951.

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Originally Published: 1999; Revised
3 pp.
Seed production for profitability is challenging. Cultural practices differ from those commonly used in forage production. This article outlines management recommendations that may help to accomplish profitable seed alfalfa yields.
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8

D'Avila, Márcia. "Insetos visitantes florais em áreas de cerradão e cerrado sensu stricto no estado de São Paulo". Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/11/11146/tde-24012007-155752/.

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Abstract (sommario):
Com o objetivo de conhecer a composição dos insetos e das plantas visitadas nas áreas de cerradão e cerrado sensu stricto, da Estação Experimental de Itirapina, SP, foram realizadas amostragens sistemáticas dos insetos nas plantas, no período de março de 2003 a fevereiro de 2004. Do total de insetos coletados nas flores, 63,3% e 63,8% são da ordem Hymenoptera, 17,1% e 2,5% da ordem Lepidoptera, 16% e 19,5% da ordem Coleoptera e 3,6% e 12,8% da ordem Diptera, respectivamente, para as áreas de cerradão e cerrado sensu stricto, e 1,4% para Hemiptera-Heteroptera no cerrado sensu stricto. A maioria dos insetos coletados, visitando e/ou forrageando, nas duas áreas, foi no período da manhã, exceto os dípteros que preferiram o período da tarde. Na área de cerradão as espécies dominantes de Hymenoptera foram: Exomalopsis (Exomalopsis) sp. e Trigona spinipes; de Lepidoptera foram: Aeria olena e Ithomia agnosia; de Coleoptera foram: Nycterodina sp. e Spintherophyta sp.. Já na área de cerrado sensu stricto os hymenópteros dominantes foram: Apis mellifera, Exomalopsis cf. analis, Tetrapedia rugulosa, Trigona spinipes e Pepsis sp., para Coleoptera foram: Spintherophyta sp., Compsus sp. e Epitragus similis; para Diptera foram: Eristalis sp. e Ornidia obesa. A família Apidae foi a mais rica em espécies e abundância, nas duas áreas de cerrado, seguindo o padrão geral encontrado em outras áreas neotropicais até o momento estudadas, apresentando muitas espécies com poucos indivíduos e poucas espécies com muitos indivíduos. Quanto a composição da flora, em ordem decrescente, as famílias Asteraceae, Melastomataceae, Apocynaceae, Malpighiaceae e Rubiaceae foram as mais representativas na área de cerradão. Na área de cerrado sensu stricto as famílias com maior número de espécies foram Fabaceae, Malpighiaceae, Asteraceae, Bignoniaceae e Myrtaceae. As espécies vegetais com maior percentual de insetos visitantes na área de cerradão foram Diplosodon virgatus (Lythraceae), Daphnopsis racemosa (Thymelaeaceae) e Borreria verticillata (Rubiaceae), e no cerrado sensu stricto foram Ocotea pulchella (Lauraceae) e Miconia rubiginosa (Melastomataceae). A família Apidae foi a que visitou maior número de espécies botânicas, seguida por Nymphalidae, Chrysomelidae, Halictidae e Vespidae, na área de cerradão. No cerrado sensu stricto foram Apidae, Syrphidae, Chrysomelidae, Curculionidae, Halictidae, Vespidae e Pompilidae. Dos insetos dominantes, Apis mellifera foi a que visitou o maior número de espécies de plantas, seguida de Exomalopsis (Exomalopsis) sp., Aeria olena e Trigona spinipes, no cerradão; e no cerrado sensu stricto foram Apis mellifera, Trigona spinipes, Exomalopsis cf. analis e Tetrapedia rugulosa.
Systematic samplings of insects on plants were carried out with the aim of studying the insect composition and visited plants in cerradao and cerrado areas stricto sensus at the Experimental Station of Itirapina ? SP between March 2003 and February 2004. Considering all insects collected on flowers in the cerradao and cerrado areas stricto sensus , 63.3% and 63.8% were Hymenoptera, 17.1% and 2.5% were Lepidoptera, 16.0% and 19.5% were Coleoptera and 3.6% and 12.8% were Diptera, respectively, while in the cerrado stricto sensus 1.4% were Hemiptera-Heteroptera. Most insects collected were visiting and/or foraging in the areas during the morning, except for diptera, which preferred the afternoon period. The dominant species within each order in the cerradao area were: Hymenoptera - Apis mellifera, Exomalopsis (Exomalopsis) sp. and Trigona spinipes; Lepidoptera - Aeria olena and Ithomia agnosia; Coleoptera - Nycterodina sp. and Spintherophyta sp.. In the cerrado area stricto sensus the dominant species were: Hymenoptera - Apis mellifera, Exomalopsis cf. analis, Tetrapedia rugulosa, Trigona spinipes and Pepsis sp.; Coleoptera - Spintherophyta sp., Compsus sp. and Epitragus similis; Diptera - Eristalis sp. and Ornidia obesa. The Apidae Family was the richest in species and most abundant in both cerrado areas, following the general pattern of other Neotropical areas already studied, with many species with few individuals and few species with many individuals. Regarding the floristic composition, the most representative families in the cerradao area were, in order, Asteraceae, Melastomataceae, Apocynaceae, Malpighiaceae and Rubiaceae. Families with most species in the cerrado area stricto sensus were Fabaceae, Malpighiaceae, Asteraceae, Bignoniaceae and Myrtaceae. The plant species in the cerradao area with the greatest percentage of visiting insects were Diplosodon virgatus (Lythraceae), Daphnopsis racemosa (Thymelaeaceae) and Borreria verticillata (Rubiaceae), while in the cerrado stricto sensus they were Ocotea pulchella (Lauraceae) and Miconia rubiginosa (Melastomataceae). The Apidae family was the one visiting most plant species in the cerradao area, followed by Nymphalidae, Chrysomelidae, Halictidae and Vespidae families, while in the cerrado stricto sensus the families visiting most plant species were Apidae, Syrphidae, Chrysomelidae, Curculionidae, Halictidae, Vespidae and Pompilidae. Apis mellifera was the species among the dominant insects of the cerradao area which visited the greatest number of plant species, followed by Exomalopsis (Exomalopsis) sp., Aeria olena and Trigona spinipes. In the cerrado stricto sensus the insect species that visited the greatest number of plants were Apis mellifera, Trigona spinipes, Exomalopsis cf. analis and Tetrapedia rugulosa.
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9

Davila, Yvonne Caroline. "Pollination ecology of Trachymene incisa (Apiaceae): Understanding generalised plant-pollinator systems". Thesis, The University of Sydney, 2006. http://hdl.handle.net/2123/1896.

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Abstract (sommario):
A renewed focus on generalised pollinator systems has inspired a conceptual framework which highlights that spatial and temporal interactions among plants and their assemblage of pollinators can vary across the individual, population, regional and species levels. Pollination is clearly a dynamic interaction, varying in the number and interdependence of participants and the strength of the outcome of the interaction. Therefore, the role of variation in pollination is fundamental for understanding ecological dynamics of plant populations and is a major factor in the evolution and maintenance of generalised and specialised pollination systems. My study centred on these basic concepts by addressing the following questions: (1) How variable are pollinators in a generalised pollination system? To what degree do insect visitation rates and assemblage composition vary spatially among populations and temporally among flowering seasons? (2) How does variation in pollinators affect plant reproductive success? I chose to do this using a model system, Trachymene incisa subsp. incisa (Apiaceae), which is a widespread Australian herbaceous species with simple white flowers grouped into umbels that attract a high diversity of insect visitors. The Apiaceae are considered to be highly generalist in terms of pollination, due to their simple and uniform floral display and easily accessible floral rewards. Three populations of T. incisa located between 70 km and 210 km apart were studied over 2-3 years. The few studies investigating spatial and temporal variation simultaneously over geographic and yearly/seasonal scales indicate that there is a trend for more spatial than temporal variation in pollinators of generalist-pollinated plants. My study showed both spatial and temporal variation in assemblage composition among all populations and variation in insect visitation rates, in the form of a significant population by year interaction. However, removing ants from the analyses to restrict the assemblage to flying insects and the most likely pollinators, resulted in a significant difference in overall visitation rate between years but no difference in assemblage composition between the Myall Lakes and Tomago populations. These results indicate more temporal than spatial variation in the flying insect visitor assemblage of T. incisa. Foraging behaviour provides another source of variation in plant-pollinator interactions. Trachymene incisa exhibits umbels that function as either male or female at any one time and offer different floral rewards in each phase. For successful pollination, pollinators must visit both male and female umbels during a foraging trip. Insects showed both preferences and non-preferences for umbel phases in natural patches where the gender ratio was male biased. In contrast, insects showed no bias in visitation during a foraging trip or in time spent foraging on male and female umbels in experimental arrays where the gender ratio was equal. Pollinator assemblages consisting of a mixture of different pollinator types coupled with temporal variation in the assemblages of populations among years maintains generalisation at the population/local level. In addition, spatial variation in assemblages among populations maintains generalisation at the species level. Fire alters pollination in T. incisa by shifting the flowering season and reducing the abundance of flying insects. Therefore, fire plays an important role in maintaining spatial and temporal variation in this fire-prone system. Although insect pollinators are important in determining the mating opportunities of 90% of flowering plant species worldwide, few studies have looked at the effects of variation in pollinator assemblages on plant reproductive success and mating. In T. incisa, high insect visitation rates do not guarantee high plant reproductive success, indicating that the quality of visit is more important than the rate of visitation. This is shown by comparing the Agnes Banks and Myall Lakes populations in 2003: Agnes Banks received the highest visitation rate from an assemblage dominated by ants but produced the lowest reproductive output, and Myall Lakes received the lowest visitation rate by an assemblage dominated by a native bee and produced the highest seedling emergence. Interestingly, populations with different assemblage composition can produce similar percentage seed set per umbel. However, similar percentage seed set did not result in similar percentage seedling emergence. Differences among years in reproductive output (total seed production) were due to differences in umbel production (reproductive effort) and proportion of umbels with seeds, and not seed set per umbel. Trachymene incisa is self-compatible and suffers weak to intermediate levels of inbreeding depression through early stages of the life cycle when seeds are self-pollinated and biparentally inbred. Floral phenology, in the form of synchronous protandry, plays an important role in avoiding self-pollination within umbels and reducing the chance of geitonogamous pollination between umbels on the same plant. Although pollinators can increase the rate of inbreeding in T. incisa by foraging on both male and female phase umbels on the same plant or closely related plants, most consecutive insect movements were between plants not located adjacent to each other. This indicates that inbreeding is mostly avoided and that T. incisa is a predominantly outcrossing species, although further genetic analyses are required to confirm this hypothesis. A new conceptual understanding has emerged from the key empirical results in the study of this model generalised pollination system. The large differences among populations and between years indicate that populations are not equally serviced by pollinators and are not equally generalist. Insect visitation rates varied significantly throughout the day, highlighting that sampling of pollinators at one time will result in an inaccurate estimate and usually underestimate the degree of generalisation. The visitor assemblage is not equivalent to the pollinator assemblage, although non-pollinating floral visitors are likely to influence the overall effectiveness of the pollinator assemblage. Given the high degree of variation in both the number of pollinator species and number of pollinator types, I have constructed a model which includes the degree of ecological and functional specialisation of a plant species on pollinators and the variation encountered across different levels of plant organisation. This model describes the ecological or current state of plant species and their pollinators, as well as presenting the patterns of generalisation across a range of populations, which is critical for understanding the evolution and maintenance of the system. In-depth examination of pollination systems is required in order to understand the range of strategies utilised by plants and their pollinators, and I advocate a complete floral visitor assemblage approach to future studies in pollination ecology. In particular, future studies should focus on the role of introduced pollinators in altering generalised plant-pollinator systems and the contribution of non-pollinating floral visitors to pollinator assemblage effectiveness. Comparative studies involving plants with highly conserved floral displays, such as those in the genus Trachymene and in the Apiaceae, will be useful for investigating the dynamics of generalised pollination systems across a range of widespread and restricted species.
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10

Davila, Yvonne Caroline. "Pollination ecology of Trachymene incisa (Apiaceae): Understanding generalised plant-pollinator systems". University of Sydney, 2006. http://hdl.handle.net/2123/1896.

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Abstract (sommario):
Doctor of Philosophy (PhD)
A renewed focus on generalised pollinator systems has inspired a conceptual framework which highlights that spatial and temporal interactions among plants and their assemblage of pollinators can vary across the individual, population, regional and species levels. Pollination is clearly a dynamic interaction, varying in the number and interdependence of participants and the strength of the outcome of the interaction. Therefore, the role of variation in pollination is fundamental for understanding ecological dynamics of plant populations and is a major factor in the evolution and maintenance of generalised and specialised pollination systems. My study centred on these basic concepts by addressing the following questions: (1) How variable are pollinators in a generalised pollination system? To what degree do insect visitation rates and assemblage composition vary spatially among populations and temporally among flowering seasons? (2) How does variation in pollinators affect plant reproductive success? I chose to do this using a model system, Trachymene incisa subsp. incisa (Apiaceae), which is a widespread Australian herbaceous species with simple white flowers grouped into umbels that attract a high diversity of insect visitors. The Apiaceae are considered to be highly generalist in terms of pollination, due to their simple and uniform floral display and easily accessible floral rewards. Three populations of T. incisa located between 70 km and 210 km apart were studied over 2-3 years. The few studies investigating spatial and temporal variation simultaneously over geographic and yearly/seasonal scales indicate that there is a trend for more spatial than temporal variation in pollinators of generalist-pollinated plants. My study showed both spatial and temporal variation in assemblage composition among all populations and variation in insect visitation rates, in the form of a significant population by year interaction. However, removing ants from the analyses to restrict the assemblage to flying insects and the most likely pollinators, resulted in a significant difference in overall visitation rate between years but no difference in assemblage composition between the Myall Lakes and Tomago populations. These results indicate more temporal than spatial variation in the flying insect visitor assemblage of T. incisa. Foraging behaviour provides another source of variation in plant-pollinator interactions. Trachymene incisa exhibits umbels that function as either male or female at any one time and offer different floral rewards in each phase. For successful pollination, pollinators must visit both male and female umbels during a foraging trip. Insects showed both preferences and non-preferences for umbel phases in natural patches where the gender ratio was male biased. In contrast, insects showed no bias in visitation during a foraging trip or in time spent foraging on male and female umbels in experimental arrays where the gender ratio was equal. Pollinator assemblages consisting of a mixture of different pollinator types coupled with temporal variation in the assemblages of populations among years maintains generalisation at the population/local level. In addition, spatial variation in assemblages among populations maintains generalisation at the species level. Fire alters pollination in T. incisa by shifting the flowering season and reducing the abundance of flying insects. Therefore, fire plays an important role in maintaining spatial and temporal variation in this fire-prone system. Although insect pollinators are important in determining the mating opportunities of 90% of flowering plant species worldwide, few studies have looked at the effects of variation in pollinator assemblages on plant reproductive success and mating. In T. incisa, high insect visitation rates do not guarantee high plant reproductive success, indicating that the quality of visit is more important than the rate of visitation. This is shown by comparing the Agnes Banks and Myall Lakes populations in 2003: Agnes Banks received the highest visitation rate from an assemblage dominated by ants but produced the lowest reproductive output, and Myall Lakes received the lowest visitation rate by an assemblage dominated by a native bee and produced the highest seedling emergence. Interestingly, populations with different assemblage composition can produce similar percentage seed set per umbel. However, similar percentage seed set did not result in similar percentage seedling emergence. Differences among years in reproductive output (total seed production) were due to differences in umbel production (reproductive effort) and proportion of umbels with seeds, and not seed set per umbel. Trachymene incisa is self-compatible and suffers weak to intermediate levels of inbreeding depression through early stages of the life cycle when seeds are self-pollinated and biparentally inbred. Floral phenology, in the form of synchronous protandry, plays an important role in avoiding self-pollination within umbels and reducing the chance of geitonogamous pollination between umbels on the same plant. Although pollinators can increase the rate of inbreeding in T. incisa by foraging on both male and female phase umbels on the same plant or closely related plants, most consecutive insect movements were between plants not located adjacent to each other. This indicates that inbreeding is mostly avoided and that T. incisa is a predominantly outcrossing species, although further genetic analyses are required to confirm this hypothesis. A new conceptual understanding has emerged from the key empirical results in the study of this model generalised pollination system. The large differences among populations and between years indicate that populations are not equally serviced by pollinators and are not equally generalist. Insect visitation rates varied significantly throughout the day, highlighting that sampling of pollinators at one time will result in an inaccurate estimate and usually underestimate the degree of generalisation. The visitor assemblage is not equivalent to the pollinator assemblage, although non-pollinating floral visitors are likely to influence the overall effectiveness of the pollinator assemblage. Given the high degree of variation in both the number of pollinator species and number of pollinator types, I have constructed a model which includes the degree of ecological and functional specialisation of a plant species on pollinators and the variation encountered across different levels of plant organisation. This model describes the ecological or current state of plant species and their pollinators, as well as presenting the patterns of generalisation across a range of populations, which is critical for understanding the evolution and maintenance of the system. In-depth examination of pollination systems is required in order to understand the range of strategies utilised by plants and their pollinators, and I advocate a complete floral visitor assemblage approach to future studies in pollination ecology. In particular, future studies should focus on the role of introduced pollinators in altering generalised plant-pollinator systems and the contribution of non-pollinating floral visitors to pollinator assemblage effectiveness. Comparative studies involving plants with highly conserved floral displays, such as those in the genus Trachymene and in the Apiaceae, will be useful for investigating the dynamics of generalised pollination systems across a range of widespread and restricted species.
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Più fonti

Libri sul tema "Insect pollination"

1

Free, John Brand. Insect pollination of crops. 2a ed. London: Academic Press, 1993.

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2

National Research Council (U.S.). Committee on the Status of Pollinators in North America. Status of pollinators in North America. Washington, D.C: National Academies Press, 2007.

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3

Des insectes et des fleurs. Monaco: Le Rocher, 1986.

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4

(Firm), Nanao Kikaku, a cura di. Insects and flowers. Milwaukee: Raintree Publishers, 1986.

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5

Brackenbury, John. Insects and flowers: A biological partnership. London: Blandford, 1995.

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6

Insects and flowers: The biology of a partnership. Princeton, N.J: Princeton University Press, 1991.

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7

Insects and flowers: The biology of a partnership. Princeton, N.J: Princeton University Press, 1985.

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8

Specialists' Meeting on Insect Pollination in Greenhouses (1999 Soesterberg, Netherlands). Insect pollination in greenhouses: Proceedings of the specialists' meeting held in Soesterberg, The Netherlands, 30 September to 2 October 1999. [Utrecht, Netherlands: Dept. of Social Insects, Utrecht University, 2000.

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9

Mayer, D. F. Bee pollination of tree fruits. [Corvallis, Or.]: Washington State University Cooperative Extension, Oregon State University Extension Service, University of Idaho Cooperative Extension Service, and the U.S. Dept. of Agriculture, 1986.

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10

International Symposium on Pollination (8th 2000 Mosonmagyaróvár, Hungary). Proceedings of the Eighth International Pollination Symposium: Pollination : integrator of crops and native plant systems. A cura di Benedek Pál Dr, Richards K. W, International Commission of Plant Bee Relationships. e International Society for Horticultural Science. Working Group on Pollination. Leuven, Belgium: ISHS, 2001.

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Capitoli di libri sul tema "Insect pollination"

1

Ramírez, Fernando, e Jose Kallarackal. "Plant-Insect Phenology and Pollination". In SpringerBriefs in Agriculture, 27–33. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-73969-4_5.

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2

Reddy, P. Venkata Rami, V. Varun Rajan, M. Mani, S. J. Kavitha e K. Sreedevi. "Insect Pollination in Horticultural Crops". In Trends in Horticultural Entomology, 491–516. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-0343-4_15.

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3

Adelabu, Dolapo Bola, e Angelinus C. Franke. "Beneficial Role of Pollination and Soil Fertility for Soybean Production in Mountainous Farming Conditions". In Sustainable Development Goals Series, 53–73. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-15773-8_5.

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AbstractThe synergetic potentials of essential ecosystem services have not been well explored under mountainous farming conditions in southern Africa. Cropping practices that maximize beneficial pollinators and reduce dependency on chemical inputs through efficient crop management in the mountainous environment are needed. The synergetic potentials of insect pollination on soybeans under varying soil fertility during two seasons in Phuthaditjhaba, the Free State, South Africa was examined. We manipulated soil fertility with fertilizer treatments and used exclusion bags to manipulate pollination intensity. High intensity of pollination services increased the seed yield by approximately 0.5 tons per hectare on optimally fertilized soil and 0.3 tons per hectare on minimally fertilized soil. This study found complementary benefits of using appropriate fertilizer rates on crop pollination. It is an efficient way to minimize losses in crop production and improve yields. However, minimal fertilizer application that is common among smallholder farmers still gave substantial yield in insect pollinator-rich environments such as Phuthaditjhaba. This finding gives an immense advantage to farmers in Phuthaditjhaba who tend to minimize the use of fertilizer due to financial issues. Harnessing the prospects from these ecosystem service benefits would help local communities to attain sustainable food production (SDGs 2 and 15).
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4

New, Tim R. "Classic Themes: Pollination Mutualisms of Insects and Plants". In Mutualisms and Insect Conservation, 37–62. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-58292-4_3.

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5

Bloom, Elias H., e David W. Crowder. "Biological Control and Pollination Services on Organic Farms". In Advances in Insect Control and Resistance Management, 27–46. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-31800-4_3.

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6

Aizen, M. A., e P. Feinsinger. "Bees Not to Be? Responses of Insect Pollinator Faunas and Flower Pollination to Habitat Fragmentation". In How Landscapes Change, 111–29. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-662-05238-9_7.

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7

Rod-im, Preecha, e Orawan Duangphakdee. "Potential of Apis florea as a Relevant Insect for Providing Pollination and Ecological Services in Thailand". In The Future Role of Dwarf Honeybees in Natural and Agricultural Systems, 229–42. First edition. | Boca Raton, FL : CRC Press, 2020.: CRC Press, 2020. http://dx.doi.org/10.1201/9781003033936-17.

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8

Kevan, Peter, e Patricia Nunes-Silva. "Pollination and Agriculture". In Encyclopedia of Social Insects, 736–45. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-28102-1_176.

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9

Kevan, Peter, e Patrícia N. Silva. "Pollination and Agriculture". In Encyclopedia of Social Insects, 1–9. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-319-90306-4_176-1.

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10

Menzel, Randolf, Uwe Greggers e Martin Hammer. "Functional Organization of Appetitive Learning and Memory in a Generalist Pollinator, the Honey Bee". In Insect Learning, 79–125. Boston, MA: Springer US, 1993. http://dx.doi.org/10.1007/978-1-4615-2814-2_4.

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Atti di convegni sul tema "Insect pollination"

1

Stavert, Jamie. "Consequences of land-use intensification on insect pollinator diversity and pollination services". In 2016 International Congress of Entomology. Entomological Society of America, 2016. http://dx.doi.org/10.1603/ice.2016.110855.

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Qu, Hongchun, Jingiing Wu e Zonglan Li. "A New Clustering Algorithm Inspired by Insect Pollination". In 2019 Chinese Automation Congress (CAC). IEEE, 2019. http://dx.doi.org/10.1109/cac48633.2019.8997410.

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Zirkle, Colton R. "Insect vs. wind pollination of the Ozark chinquapin,Castanea ozarkensis". In 2016 International Congress of Entomology. Entomological Society of America, 2016. http://dx.doi.org/10.1603/ice.2016.111581.

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Remadevi, O. K. "Pollination biology and the role of insect pollinators in conservation of mangroves in west coast of India". In 2016 International Congress of Entomology. Entomological Society of America, 2016. http://dx.doi.org/10.1603/ice.2016.105586.

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5

Clough, Yann. "CANCELLED: From policy to pollination: using mechanistic models to assess policy alternatives and management interventions on insect-mediated ecosystem services". In 5th European Congress of Conservation Biology. Jyväskylä: Jyvaskyla University Open Science Centre, 2018. http://dx.doi.org/10.17011/conference/eccb2018/107666.

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6

Sengupta, Panchali, e Narayan Ghorai. "Analysis of Plant-Insect Pollination Network—A Case Study on the Exotic Plants as Nectar Resource of Butterflies across Darjeeling District of West Bengal, India". In IECPS 2021. Basel Switzerland: MDPI, 2021. http://dx.doi.org/10.3390/iecps2021-11970.

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7

Suinyuy, Terence N., John S. Donaldson, Steven D. Johnson e J. DeWet Bösenberg. "Role of Cycad Cone Volatile Emissions and Thermogenesis in the Pollination of Encephalartos villosus Lem.: Preliminary Findings from Studies of Plant Traits and Insect Responses". In CYCAD 2008. The New York Botanical Garden Press, 2012. http://dx.doi.org/10.21135/893275150.022.

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8

Kendall, Liam, Ignasi Bartomeus, Daniel Cariveau, Vesna Gagic, Katherine Baldock, Andrea Holzschuh, Juanita Rodriguez, Laura Russo e Romina Rader. "“Pollinator size and its consequences” - Predictive allometry for pollinating insects: An R package". In 5th European Congress of Conservation Biology. Jyväskylä: Jyvaskyla University Open Science Centre, 2018. http://dx.doi.org/10.17011/conference/eccb2018/107966.

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9

Timuş, Asea, e Elena Baban. "Entomofauna speciei Rosa canina l. din zona de centru a Republicii Moldova". In International symposium ”Actual problems of zoology and parasitology: achievements and prospects” dedicated to the 100th anniversary from the birth of academician Alexei Spassky. Institute of Zoology, Republic of Moldova, 2018. http://dx.doi.org/10.53937/9789975665902.79.

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In the work are exposed investigations in 2007-2017 of entomofauna with development on the species Rosa canina L. from various urban and rural biotopes in the center of the Republic of Moldova. In total, were recorded 52 species of insects in 9 orders (Orthoptera, Homoptera, Hemiptera, Thysanoptera, Coleoptera, Neuroptera, Lepidoptera, Hymenoptera, Diptera) and 1 mite (Trombidiformes). Of these, 17 species of insects have developed large populations and impact on the rose, 12 insect species developed annual faunistic populations, 12 solitary and rare individuals, 2 species one individual. At the same time, 4 species have been recorded recently: Harmonia axiridis (predators afidophagus), Polygonia c-album (nectar consumer and pollinator), Blenocampa phyllocopa (phytophagus in the larval stage) and Dasineura rosae (gallicol in the larval stage). The species Epicometis hirta was affected by the calamity of 21-23 April 2017, after which it was not recorded in the center of the republic, including the usual host plants, thus being considered an ecological indicator.
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Lowe, Abigail, Laura Jones, Col Ford, Matthew Hegarty, Simon Creer e Natasha de Vere. "Investigating the value of gardens for providing floral resources to pollinating insects". In 5th European Congress of Conservation Biology. Jyväskylä: Jyvaskyla University Open Science Centre, 2018. http://dx.doi.org/10.17011/conference/eccb2018/107582.

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Rapporti di organizzazioni sul tema "Insect pollination"

1

MacAllister, Irene E., Jinelle H. Sperry e Pamela Bailey. Identification of Insect-Plant Pollination Networks for a Midwest Installation: Fort McCoy, WI. Fort Belvoir, VA: Defense Technical Information Center, aprile 2016. http://dx.doi.org/10.21236/ad1007540.

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2

Adelberg, Jeff, Halina Skorupska, Bill Rhodes, Yigal Cohen e Rafael Perl-Treves. Interploid Hybridization of Cucumis melo and C. metuliferus. United States Department of Agriculture, dicembre 1999. http://dx.doi.org/10.32747/1999.7580673.bard.

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The long-term motivation for this research is to transfer useful traits from a broad based gene pool of wild species into the narrow base of a cultivated crop in Cucumis. Our primary focus was to use polyploid prior to fertilization as a tool to overcome fertility barriers in the cross between C. melo and C. metuliferus. In conducting this research, we explored all combinations of tetraploid and diploid parents, in reciprocal combinations. Pollinations were made in both the field and greenhouse, using emasculated flowers, moneocious females, and open pollination by insect vectors, with morphological selection criteria. After observations of thousands of ovaries, we still have no definitive proof that this hybridization yielded viable embryos. The most promising results came from using tetraploid C. metuliferus, as the maternal parent in the interspecific hybridization, that set fruit were seeds contained small embryos that did not germinate. To obtain fruit set, it was important to rear plants in a cooler sunny greenhouse, as would be found in late winter/early spring. A second interspecific hybrid between wild and cultivated Cucumis, C. hystrix x C. sativus, yielded fertile progeny for the first time, while concomitantly working toward our primary goal. Two distinct treatments were necessary; 1) special plant husbandry was necessary to have the wild species produce fruit in cultivation, and 2) embryo rescue followed by chromosome doubling in vitro was required for fertility restoration. Backcrosses to crop species and resistance to nematodes are compelling areas for further work.
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3

Bloch, Guy, Gene E. Robinson e Mark Band. Functional genomics of reproduction and division of labor in a key non-Apis pollinator. United States Department of Agriculture, gennaio 2011. http://dx.doi.org/10.32747/2011.7699867.bard.

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i. List the original objectives, as defined in the approved proposal, and any revisions made at the beginning or during the course of project. Our objectives were: 1) develop state-of-the-art functional genomics tools for B. terrestris. These resources will be then used to: 2) characterize genes and molecular pathways that are associated with reproduction, 3) characterize genes and molecular pathways associated with specialization in foraging or nursing activities, and 4) determine the extent to which juvenile hormone (JH) is involved in the regulation of reproduction and division of labor. 5) Use RNA interference to down regulate genes associated with reproductive physiology, division of labor, or both. A decrease in the cost of RNA sequencing enabled us to further use the BARD support to extend our research to three additional related projects: A) The regulation of body size which is crucial for understanding both reproduction (castedetermination) and (size based) division of labor in bumblebees. B) Analyze RNA editing in our RNA sequencing data which improves the molecular understanding of the systems we study. C) The influence of JH on the fat body in addition to the brain on which we focused in our proposal. The fat body is a key tissue regulating insect reproduction and health. ii. Background to the topic. Bees are by far the most important pollinators in agricultural and natural ecosystems. The recent collapse of honey bee populations, together with declines in wild bee (including bumble bee) populations, puts their vital pollination services under severe threat. A promising strategy for circumventing this risk is the domestication and mass-rearing of non-Apis bees. This approach has been successfully implemented for several bumble bees including Bombusterrestris in Israel, and B. impatiens in the US, which are mass-reared in captivity. In spite of their critical economic and environmental value, little is known about the physiology and molecular biology of bumble bees. In this collaborative project we developed functional genomics tools for the bumble bee B. terrestris and use these tools for a first thorough study on the physiology and molecular biology of reproduction, dominance, and division of labor in a bumble bee. iii. Major conclusions, solutions. The valuable molecular data of this project together with the functional tools and molecular information generated in this BARD funded project significantly advanced the understanding of bumblebee biology which is essential for maintaining their vital pollination services for US and Israel agriculture.
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4

Strickler, Karen, e J. Mark Schriber. ELF Communications System Ecological Monitoring Program: Pollinating Insect Studies. Fort Belvoir, VA: Defense Technical Information Center, novembre 1994. http://dx.doi.org/10.21236/ada297183.

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5

Law, Edward, Samuel Gan-Mor, Hazel Wetzstein e Dan Eisikowitch. Electrostatic Processes Underlying Natural and Mechanized Transfer of Pollen. United States Department of Agriculture, maggio 1998. http://dx.doi.org/10.32747/1998.7613035.bard.

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Abstract (sommario):
The project objective was to more fully understand how the motion of pollen grains may be controlled by electrostatic forces, and to develop a reliable mechanized pollination system based upon sound electrostatic and aerodynamic principles. Theoretical and experimental analyses and computer simulation methods which investigated electrostatic aspects of natural pollen transfer by insects found that: a) actively flying honeybees accumulate ~ 23 pC average charge (93 pC max.) which elevates their bodies to ~ 47 V likely by triboelectrification, inducing ~ 10 fC of opposite charge onto nearby pollen grains, and overcoming their typically 0.3-3.9 nN detachment force resulting in non-contact electrostatic pollen transfer across a 5 mm or greater air gap from anther-to-bee, thus providing a theoretical basis for earlier experimental observations and "buzz pollination" events; b) charge-relaxation characteristics measured for flower structural components (viz., 3 ns and 25 ns time constants, respectively, for the stigma-style vs. waxy petal surfaces) ensure them to be electrically appropriate targets for electrodeposition of charged pollen grains but not differing sufficiently to facilitate electrodynamic focusing onto the stigma; c) conventional electrostatic focusing beneficially concentrates pollen-deposition electric fields onto the pistill tip by 3-fold as compared to that onto underlying flower structures; and d) pollen viability is adequately maintained following exposure to particulate charging/management fields exceeding 2 MV/m. Laboratory- and field-scale processes/prototype machines for electrostatic application of pollen were successfully developed to dispense pollen in both a dry-powder phase and in a liquid-carried phase utilizing corona, triboelectric, and induction particulate-charging methods; pollen-charge levels attained (~ 1-10 mC/kg) provide pollen-deposition forces 10-, 77-, and 100-fold greater than gravity, respectively, for such charged pollen grains subjected to a 1 kV/cm electric field. Lab and field evaluations have documented charged vs. ukncharged pollen deposition to be significantly (a = 0.01-0.05) increased by 3.9-5.6 times. Orchard trials showed initial fruit set on branches individually treated with electrostatically applied pollen to typically increase up to ~ 2-fold vs. uncharged pollen applications; however, whole-tree applications have not significantly shown similar levels of benefit and corrective measures continue. Project results thus contribute important basic knowledge and applied electrostatics technology which will provide agriculture with alternative/supplemental mechanized pollination systems as tranditional pollen-transfer vectors are further endangered by natural and man-fade factors.
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