Contents 1 Coevolution 1.1 History 1.2 The plant's needs 1.3 Mechanisms 1.4 Plant-insect pairings 2 Etymology 3 Taxonomic range 4 References

Coevolution[edit] Further information: Coevolution History[edit] The insect-pollinated flowers of angiosperms use a combination of cues such as bright colours and streaked patterns to advertise themselves to insects. The early spermatophytes (seed plants) were largely dependent on the wind to carry their pollen from one plant to another, and it was around 125 to 115 million years ago that a new pollination strategy developed and angiosperms (flowering plants) first appeared. Before that, insect involvement in pollination was limited to "pollination assistants", insects which inadvertently carried the pollen between plants merely by their movements. The real relationship between plants and insects began in the Early Cretaceous, with beetle-pollinated gymnosperms.[1] The morphology of the first fossil basal angiosperms is similar to modern-day plants that are also fertilised by beetles. It seems likely that beetles led the way in insect pollination, followed by flies. Among the twelve living families of basal angiosperms, six are predominantly pollinated by flies, five by beetles and only one by bees. Nevertheless, traits such as sapromyophily (emitting the odour of carrion to attract flies) have evolved independently in several unrelated angiosperm families.[2] The plant's needs[edit] Wind and water pollination require the production of vast quantities of pollen because of the chancy nature of its deposition. If they are not to be reliant on the wind or water (for aquatic species), plants need pollinators to move their pollen grains from one plant to another. They particularly need pollinators to consistently choose flowers of the same species, so they have evolved different lures to encourage specific pollinators to maintain fidelity to the same species. The attractions offered are mainly nectar, pollen, fragrances and oils. The ideal pollinating insect is hairy (so that pollen adheres to it), and spends time exploring the flower so that it comes into contact with the reproductive structures.[3] Mechanisms[edit] Many insects are pollinators, particularly bees, Lepidoptera (butterflies and moths), wasps, flies, ants and beetles.[3] On the other hand, some plants are generalists, being pollinated by insects in several orders.[4] Entomophilous plant species have frequently evolved mechanisms to make themselves more appealing to insects, e.g., brightly coloured or scented flowers, nectar, or appealing shapes and patterns. Pollen grains of entomophilous plants are generally larger than the fine pollens of anemophilous (wind-pollinated) plants, which has to be produced in much larger quantities because such a high proportion is wasted. This is energetically costly, but in contrast, entomophilous plants have to bear the energetic costs of producing nectar.[5] Hummingbird moth on Clarkia Butterflies and moths have hairy bodies and long proboscides which can probe deep into tubular flowers. Butterflies mostly fly by day and are particularly attracted to pink, mauve and purple flowers. The flowers are often large and scented, and the stamens are so-positioned that pollen is deposited on the insects while they feed on the nectar. Moths are mostly nocturnal and are attracted by night-blooming plants. The flowers of these are often tubular, pale in colour and fragrant only at night. Hawkmoths tend to visit larger flowers and hover as they feed; they transfer pollen by means of the proboscis. Other moths land on the usually smaller flowers, which may be aggregated into flowerheads. Their energetic needs are not so great as those of hawkmoths and they are offered smaller quantities of nectar.[6] Inflorescences pollinated by beetles tend to be flat with open corollas or small flowers clustered in a head with multiple, projecting anthers that shed pollen readily.[3] The flowers are often green or pale-coloured, and heavily scented, often with fruity or spicy aromas, but sometimes with odours of decaying organic matter. Some, like the giant water lily, include traps designed to retain the beetles in contact with the reproductive parts for longer periods.[7] Female hoverfly Dasysyrphus albostriatus Unspecialised flies with short proboscides are found visiting primitive flowers with readily accessible nectar. More specialised flies like syrphids and tabanids can visit more advanced blooms, but their purpose is to nourish themselves, and any transfer of pollen from one flower to another happens haphazardly. The small size of many flies is often made up for by their abundance, however they are unreliable pollinators as they may bear incompatible pollen, and lack of suitable breeding habitats may limit their activities. Some Pterostylis orchids are pollinated by midges unique to each species. A decline, for whatever reason, to one side of this partnership can be catastrophic for the other.[8] Flowers pollinated by bees and wasps vary in shape, colour and size. Yellow or blue plants are often visited, and flowers may have ultra-violet nectar guides, that help the insect to find the nectary. Some flowers, like sage or pea, have lower lips that will only open when sufficiently heavy insects, such as bees, land on them. With the lip depressed, the anthers may bow down to deposit pollen on the insect's back. Other flowers, like tomato, may only liberate their pollen by buzz pollination, a technique in which a bumblebee will cling on to a flower while vibrating its flight muscles, and this dislodges the pollen. Because bees care for their brood, they need to collect more food than just to maintain themselves, and therefore are important pollinators.[8] Other bees are nectar thieves and bite their way through the corolla in order to raid the nectary, in the process bypassing the reproductive structures.[3] Ants are not well adapted to pollination but they have been shown to perform this function in Polygonum cascadense and in certain desert plants with small blossoms near the ground with little fragrance or visual attraction, small quantities of nectar and limited quantities of sticky pollen.[8] Plant-insect pairings[edit] The bee orchid mimics bees in appearance and scent, implying close coevolution of a species of flower and a species of insect. Some plant species co-evolved with a particular pollinator species, such as the bee orchid. The species is almost exclusively self-pollinating in its northern ranges, but is pollinated by the solitary bee Eucera in the Mediterranean area. The plant attracts these insects by producing a scent that mimics the scent of the female bee. In addition, the lip acts as a decoy, as the male bee confuses it with a female that is visiting a pink flower. Pollen transfer occurs during the ensuing pseudocopulation.[9] Cross section of a Ficus glomerata (fig) fruit showing the syconium with pollinating fig wasps inside. Figs in the genus Ficus have a mutualistic arrangement with certain tiny agaonid wasps. In the common fig, the inflorescence is a syconium, formed by an enlarged, fleshy, hollow receptacle with multiple ovaries on the inner surface. A female wasp enters through a narrow aperture, fertilises these pistillate flowers and lays its eggs in some ovaries, with galls being formed by the developing larvae. In due course, staminate flowers develop inside the syconium. Wingless male wasps hatch and mate with females in the galls before tunnelling their way out of the developing fruit. The winged females, now laden with pollen, follow, flying off to find other receptive syconia at the right stage of development. Most species of fig have their own unique commensal species of wasp.[10]

Etymology[edit] The word is artificially derived from the Greek: εντομο-, entomo-[11] "cut in pieces, segmented", hence "insect"; and φίλη, phile, "loved".

Taxonomic range[edit] Wind pollination is the reproductive strategy adopted by the grasses, sedges, rushes and catkin-bearing plants. Other flowering plants are mostly pollinated by insects (or birds or bats), which seems to be the primitive state, and some plants have secondarily developed wind pollination. Some plants that are wind pollinated have vestigial nectaries, and other plants like common heather that are regularly pollinated by insects, produce clouds of pollen and some wind pollination is inevitable. The hoary plantain is primarily wind pollinated, but is also visited by insects which pollinate it.[5] In general, showy, colourful, fragrant flowers like sunflowers, orchids and Buddleja are insect pollinated. The only entomophilous plants that are not seed plants are the dung-mosses of the family Splachnaceae.[12]

References[edit] ^ "Mid-Mesozoic beetle in amber stirs questions on rise of flowering plants and pollinators". The Archaeology News Network. 2 March 2017. Retrieved 3 March 2017.  ^ McGhee, George R. (2011). Convergent Evolution: Limited Forms Most Beautiful. MIT Press. pp. 118–120. ISBN 978-0-262-01642-1.  ^ a b c d Kimsey, L. "Pollinators We Never Talk About". University of California, Davis: College of Agricultural and Environmental Sciences. Retrieved 25 March 2016.  ^ "Entomofauna associated to the floration of Schinus terebinthifolius Raddi (Anacardiaceae) in the Rio Grande do Sul State, Brazil = Entomofauna associada à floração de Schinus terebinthifolius Raddi (Anacardiaceae) no Estado do Rio Grande do Sul, Brasil | Somavilla |". Retrieved 18 April 2014.  ^ a b Faegri, K.; Van Der Pijl, L. (2013). Principles of Pollination Ecology. Elsevier. pp. 34–36. ISBN 978-1-4832-9303-5.  ^ Oliveira, P.E.; Gibbs, P.E.; Barbosa, A.A. (2004). "Moth pollination of woody species in the Cerrados of Central Brazil: a case of so much owed to so few?". Plant Systematics and Evolution. 245 (1–2): 41–54. doi:10.1007/s00606-003-0120-0.  ^ Prance, Ghillean T. (1996). The Earth Under Threat: A Christian Perspective. Wild Goose Publications. p. 14. ISBN 978-0-947988-80-7.  ^ a b c Faegri, K.; Van Der Pijl, L. (2013). Principles of Pollination Ecology. Elsevier. pp. 102–110. ISBN 978-1-4832-9303-5.  ^ Fenster, Charles B.; Marten-Rodriguez, Silvana (2007). "Reproductive Assurance And The Evolution Of Pollination Specialization" (PDF). International Journal of Plant Sciences. 168 (2): 215–228. doi:10.1086/509647.  ^ Faegri, K.; Van Der Pijl, L. (2013). Principles of Pollination Ecology. Elsevier. pp. 176–177. ISBN 978-1-4832-9303-5.  ^ Liddell, Henry George and Robert Scott (1980). A Greek-English Lexicon (Abridged Edition). United Kingdom: Oxford University Press. ISBN 0-19-910207-4.  ^ Goffinet, Bernard; Shaw, A. Jonathan; Cox, Cymon J. (2004). "Phylogenetic inferences in the dung-moss family Splachnaceae from analyses of cpDNA sequence data and implications for the evolution of entomophily". American Journal of Botany. 91 (5): 748–759. doi:10.3732/ajb.91.5.748. PMID 21653429.  Wikimedia Commons has media related to Pollination. v t e Pollination Anemophily Entomophily Hydrophily Ornithophily Zoophily v t e Insects in culture Aspects of insects in culture In the arts Insects in art Beetlewing Insects in film Insects in literature Insects in music List of insect-inspired songs Insects on stamps In fishing Fishing bait Fly fishing Artificial fly Fly tying Maggot Mayfly Mealworm In medicine Apitherapy Apitoxin Melittin Maggot Spanish fly Cantharidin In mythology Bee Butterfly Cicada Dragonfly Praying mantis Scarab Entomophagy (as food) Adults Ant Cicada Cricket Grasshopper Termite Larvae Bamboo worm Darkling beetle Mealworm Mopani worm Rhinoceros beetle Silkworm Waxworm Witchetty grub Other aspects Biomimicry Cricket fighting Entomological warfare Flea circus Insects in religion Jingzhe Economic entomology Beneficial insects Pest control Encarsia formosa Ichneumon wasp Ladybird Pollination Bees crops pollinated Bumblebee Honey bee western Beetles Flies Lepidoptera Products Beekeeping Bee pollen Beeswax Honey Propolis Royal jelly Other insects Carmine/Cochineal Polish Chitin Kermes Sericulture Silk Lac/Shellac Model organism Drosophila melanogaster Harmful insects Crop pests Aphid Boll weevil Colorado potato beetle Cottony cushion scale Japanese beetle Locust Phylloxera Western corn rootworm Livestock pests Botfly Horn fly Horse-fly Screwworm fly Tsetse fly Warble fly Biting/stinging Insect bites and stings Insect sting allergy Bed bug Bee sting Flea Horse-fly Louse Mosquito Wasp Wood-eating Deathwatch beetle Furniture beetle House longhorn beetle Termite Woodworm Other pests Home-stored product entomology Clothes moth Cockroach Housefly Pioneers Jan Swammerdam Alfred Russel Wallace Jean-Henri Fabre Hans Zinsser (Rats, Lice and History) Lafcadio Hearn (Insect Literature) Related Living things in culture Arthropods Birds Fish Fungi Mammals Microbes Molluscs Reptiles Plants Zoomusicology Retrieved from "" Categories: BotanyPollinationInsect ecologyEvolutionary biologyPlantsInsects in cultureHidden categories: Commons category without a link on Wikidata

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