Contents 1 Abiotic 1.1 Wind pollination (anemophily) 1.2 Water pollination (hydrophily) 2 Biotic 2.1 Bee pollination (melittophily) 2.2 Wasp pollination 2.3 Butterfly pollination (psychophily) 2.4 Moth pollination (phalaenophily) 2.5 Fly pollination (myophily and sapromyophily) 2.6 Bird pollination (ornithophily) 2.7 Bat pollination (chiropterophily) 2.8 Beetle pollination (cantharophily) 3 Biology 3.1 Advantages of specialization 3.2 Advantages of generalization 3.3 Criticisms of the syndromes 4 See also 5 References 6 Bibliography


Abiotic[edit] These do not attract animal pollinators. Nevertheless, they often have suites of shared traits. Plantago media, pollinated by wind or insects Wind pollination (anemophily)[edit] Flowers may be small and inconspicuous, as well as green and not showy. They produce enormous numbers of relatively small pollen grains (hence wind-pollinated plants may be allergens, but seldom are animal-pollinated plants allergenic). Their stigmas may be large and feathery to catch the pollen grains. Insects may visit them to collect pollen; in some cases, these are ineffective pollinators and exert little natural selection on the flowers, but there are also examples of ambophilous flowers which are both wind and insect pollinated. Anemophilous, or wind pollinated flowers, are usually small and inconspicuous, and do not possess a scent or produce nectar. The anthers may produce a large number of pollen grains, while the stamens are generally long and protrude out of flower. Water pollination (hydrophily)[edit] Water-pollinated plants are aquatic and pollen is released into the water. Water currents therefore act as a pollen vector in a similar way to wind currents. Their flowers tend to be small and inconspicuous with lots of pollen grains and large, feathery stigmas to catch the pollen. However, this is relatively uncommon (only 2% of pollination is hydrophily) and most aquatic plants are insect-pollinated, with flowers that emerge into the air. Vallisneria is an example.


Biotic[edit] Sunflower pollinated by butterflies and bees Bee pollination (melittophily)[edit] Bee-pollinated flowers can be very variable in their size, shape and colouration. They can be open and bowl-shaped (radially symmetrical) or more complex and non-radially symmetric ("zygomorphic"), as is the case with many peas and foxgloves. Some bee flowers tend to be yellow or blue, often with ultraviolet nectar guides and scent. Nectar, pollen, or both are offered as rewards in varying amounts. The sugar in the nectar tends to be sucrose-dominated. A few bees collect oil from special glands on the flower.[4] There are diverse types of bees (such as honeybees, bumblebees, and orchid bees), forming large groups that are quite distinctive in size, tongue length and behaviour (some solitary, some colonial); thus generalization about bees is difficult.[5] Some plants can only be pollinated by bees because their anthers release pollen internally, and it must be shaken out by buzz pollination (also known as "sonication"). Bees are the only animals that perform this behaviour. Bumblebees sonicate, but honeybees do not. Wasp pollination[edit] Wasps are also responsible for the pollination of several plants species, being important pollen vectors, and in some cases, even more efficient pollinators than bees.[6] Butterfly pollination (psychophily)[edit] Butterfly-pollinated flowers tend to be large and showy, pink or lavender in colour, frequently have a landing area, and are usually scented. Since butterflies do not digest pollen (with one exception), more nectar is offered than pollen. The flowers have simple nectar guides with the nectaries usually hidden in narrow tubes or spurs, reached by the long tongue of the butterflies. Hesperoyucca whipplei (moth-pollinated) Moth pollination (phalaenophily)[edit] Day-flying sphinx moth nectaring on Brazilian vervain Among the more important moth pollinators are the hawk moths (Sphingidae). Their behaviour is similar to hummingbirds: they hover in front of flowers with rapid wingbeats. Most are nocturnal or crepuscular. So moth-pollinated flowers tend to be white, night-opening, large and showy with tubular corollas and a strong, sweet scent produced in the evening, night or early morning. A lot of nectar is produced to fuel the high metabolic rates needed to power their flight. Other moths (Noctuids, Geometrids, Pyralids, for example) fly slowly and settle on the flower. They do not require as much nectar as the fast-flying hawk moths, and the flowers tend to be small (though they may be aggregated in heads).[7] Sapromyophilous Stapelia gigantea Fly pollination (myophily and sapromyophily)[edit] Flies tend to be important pollinators in high-altitude and high-latitude systems, where they are numerous and other insect groups may be lacking.[8] There are two main types of fly pollination: myophily and sapromyophily. Myophily includes flies that feed on nectar and pollen as adults - particularly bee flies (Bombyliidae), hoverflies (Syrphidae), and others - and these regularly visit flowers. In contrast, male fruit flies (Tephritidae) are enticed by specific floral attractants emitted by some wild orchids which do not produce nectar.[9][10] Chemicals emitted by the orchid act as the fly's sex pheromone precursor or booster. Myophilous plants tend not to emit a strong scent, are typically purple, violet, blue, and white, and have open dishes or tubes.[11] Sapromyophiles, on the other hand, normally visit dead animals or dung. They are attracted to flowers which mimic the odor of such objects. The plant provides them with no reward and they leave quickly unless it has traps to slow them down. Such plants are far less common than myophilous ones.[12] Bird pollination (ornithophily)[edit] Main article: Ornithophily Although hummingbirds are the most familiar nectar-feeding birds for North Americans, there are analogous species in other parts of the world: sunbirds, honeyeaters, flowerpeckers, honeycreepers, bananaquits, flowerpiercers, lories and lorikeets.[13] Hummingbirds are the oldest group, with the greatest degree of specialization on nectar.[13] Flowers attractive to hummingbirds that can hover in front of the flower tend to be large red or orange tubes with a lot of dilute nectar, secreted during the day. Since birds do not have a strong response to scent, they tend to be odorless. Perching birds need a substantial landing platform, so sunbirds, honeyeaters, and the like are less associated with tubular flowers. African baobab (bat-pollinated) Bat pollination (chiropterophily)[edit] Bat-pollinated flowers tend to be large and showy, white or light coloured, open at night and have strong musty odours. They are often large and bell-shaped or a ball of stamens. Flowers are typically borne away from the trunk or other obstructions.[14] Bats drink the nectar, and these plants typically offer nectar for extended periods of time. Sight, smell, and echo-location are used to initially find the flowers, and excellent spatial memory is used to visit them repeatedly.[15] In fact, bats can identify nectar-producing flowers using echolocation.[15] In the New World, bat pollinated flowers often have sulfur-scented compounds, but this does not carry to other parts of the world.[16] Bat-pollinated plants have bigger pollen than their relatives.[17] Beetle pollination (cantharophily)[edit] Beetle-pollinated flowers are usually large, greenish or off-white in color and heavily scented. Scents may be spicy, fruity, or similar to decaying organic material. Most beetle-pollinated flowers are flattened or dish shaped, with pollen easily accessible, although they may include traps to keep the beetle longer. The plant's ovaries are usually well protected from the biting mouthparts of their pollinators.[18] Beetles may be particularly important in some parts of the world such as semi-arid areas of southern Africa and southern California[19] and the montane grasslands of KwaZulu-Natal in South Africa.[20]


Biology[edit] Pollination syndromes reflect convergent evolution towards forms (phenotypes) that limit the number of species of pollinators visiting the plant.[5] They increase the functional specialization of the plant with regard to pollination, though this may not affect the ecological specialization (i.e. the number of species of pollinators within that functional group).[21] They are responses to common selection pressures exerted by shared pollinators or abiotic pollen vectors, which generate correlations among traits. That is, if two distantly related plant species are both pollinated by nocturnal moths, for example, their flowers will converge on a form which is recognised by the moths (e.g. pale colour, sweet scent, nectar released at the base of a long tube, night-flowering). Advantages of specialization[edit] Efficiency of pollination: the rewards given to pollinators (commonly nectar or pollen or both, but sometimes oil,[22] scents, resins, or wax) may be costly to produce. Nectar can be cheap, but pollen is generally expensive as it is relatively high in nitrogen compounds. Plants have evolved to obtain the maximum pollen transfer for the minimum reward delivered. Different pollinators, because of their size, shape, or behaviour, have different efficiencies of transfer of pollen. And the floral traits affect efficiency of transfer: columbine flowers were experimentally altered and presented to hawkmoths, and flower orientation, shape, and colour were found to affect visitation rates or pollen removal.[23][24] Pollinator constancy: to efficiently transfer pollen, it is best for the plant if the pollinator focuses on one species of plant, ignoring other species. Otherwise, pollen may be dropped uselessly on the stigmas of other species. Animals, of course, do not aim to pollinate, they aim to collect food as fast as they can. However, many pollinator species exhibit constancy, passing up available flowers to focus on one plant species. Why should animals specialize on a plant species, rather than move to the next flower of any species? Although pollinator constancy was recognized by Aristotle, the benefits to animals are not yet fully understood.[25] The most common hypothesis is that pollinators must learn to handle particular types of flowers, and they have limited capacity to learn different types. They can only efficiently gather rewards from one type of flower. These honeybees selectively visit flowers from only one species for a period of time, as can be seen by the colour of the pollen in their baskets: Advantages of generalization[edit] Pollinators fluctuate in abundance and activity independently of their plants,[21][26] and any one species may fail to pollinate a plant in a particular year. Thus a plant may be at an advantage if it attracts several species or types of pollinators, ensuring pollen transfer every year.[27] Many species of plants have the back-up option of self-pollination, if they are not self-incompatible. Criticisms of the syndromes[edit] Whilst it is clear that pollination syndromes can be observed in nature, there has been much debate amongst scientists as to how frequent they are and to what extent we can use the classical syndromes to classify plant-pollinator interactions.[28] Although some species of plants are visited only by one type of animal (i.e. they are functionally specialized), many plant species are visited by very different pollinators.[27][29] For example, a flower may be pollinated by bees, butterflies, and birds. Strict specialization of plants relying on one species of pollinator is relatively rare, probably because it can result in variable reproductive success across years as pollinator populations vary significantly.[27] In such cases, plants should generalize on a wide range of pollinators, and such ecological generalization is frequently found in nature. A study in Tasmania found the syndromes did not usefully predict the pollinators.[30] This debate has led to a critical re-evaluation of the syndromes, which suggests that on average about one third of the flowering plants can be classified into the classical syndromes.[3] This reflects the fact that nature is much less predictable and straightforward than 19th Century biologists originally thought. Pollination syndromes can be thought of as extremes of a continuum of greater or lesser specialization or generalization onto particular functional groups of pollinators that exert similar selective pressures"[5] and the frequency with which flowers conform to the expectations of the pollination syndromes is relatively rare. In addition, new types of plant-pollinator interaction, involving "unusual" pollinating animals are regularly being discovered, such as specialized pollination by spider hunting wasps (Pompilidae) and fruit chafers (Cetoniidae) in the eastern grasslands of South Africa.[20] These plants do not fit into the classical syndromes, though they may show evidence of convergent evolution in their own right. An analysis of flower traits and visitation in 49 species in the plant genus Penstemon found that it was possible to separate bird- and bee- pollinated species quite well, but only by using floral traits which were not considered in the classical accounts of syndromes, such as the details of anther opening.[31] Although a recent review concluded that there is "overwhelming evidence that functional groups exert different selection pressures on floral traits",[5] the sheer complexity and subtlety of plant-pollinator interactions (and the growing recognition that non-pollinating organisms such as seed predators can affect the evolution of flower traits) means that this debate is likely to continue for some time.


See also[edit] Anemophily, entomophily, hydrophily, ornithophily, zoophily Mutualism (biology) Pollinator decline Floral biology Pollination trap


References[edit] ^ Faegri & Pijl 1980. ^ Proctor M; P. Yeo & A. Lack (1996). The natural history of pollination. HarperCollins, London. ISBN 0-88192-352-4.  ^ a b Ollerton J.; Alarcón R.; Waser N.M.; Price M.V.; Watts S.; Cranmer L.; Hingston A. Peter; Rotenberry J. (2009). "A global test of the pollination syndrome hypothesis". Annals of Botany. 103: 1471–1480. doi:10.1093/aob/mcp031.  ^ Martins Aline C.; Melo Gabriel A.R.; Renner Susanne S. (2014). "The corbiculate bees arose from New World oil-collecting bees: Implications for the origin of pollen baskets". Molecular Phylogenetics and Evolution. 80: 88–94. doi:10.1016/j.ympev.2014.07.003. PMID 25034728.  ^ a b c d Fenster, CB, WS Armbruster, P Wilson, MR Dudash, and JD Thomson (2004). "Pollination syndromes and floral specialization". Annual Review of Ecology and Systematics. 35 (1): 375–403. doi:10.1146/annurev.ecolsys.34.011802.132347. CS1 maint: Multiple names: authors list (link) ^ Sühs R.B.; Somavilla A.; Putzke J.; Köhler A. (2009). "Pollen vector wasps (Hymenoptera, Vespidae) of Schinus terebinthifolius Raddi (Anacardiaceae), Santa Cruz do Sul, RS, Brazil". Brazilian Journal of Biosciences. 7 (2): 138–143.  ^ Oliveira PE; PE Gibbs & AA Barbosa (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.  ^ Larson BMH; PG Kevan & DW Inouye (2001). "Flies and flowers: taxonomic diversity of anthophiles and pollinators". Canadian Entomologist. 133 (4): 439–465. doi:10.4039/Ent133439-4.  ^ Tan, KH & R Nishida (2000). "Mutual reproductive benefits between a wild orchid, Bulbophyllum patens, and Bactrocera fruit flies via a floral synomone". Journal of Chemical Ecology. 26 (2): 533–546. doi:10.1023/A:1005477926244.  ^ Tan, KH, LT Tan and R Nishida (2006). "Floral phenylpropanoid cocktail and architecture of Bulbophyllum vinaceum orchid in attracting fruit flies for pollination". Journal of Chemical Ecology. 32 (11): 2429–2441. doi:10.1007/s10886-006-9154-4. PMID 17082990. CS1 maint: Multiple names: authors list (link) ^ Kastinger C & A Weber (2001). "Bee-flies (Bombylius spp., Bombyliidae, Diptera) and the pollination of flowers". Flora. 196 (1): 3–25.  ^ Jones, GD & SD Jones (2001). "The uses of pollen and its implication for Entomology". Neotropical Entomology. 30 (3): 314–349. doi:10.1590/S1519-566X2001000300001.  ^ a b Lotz, CN & JE Schondube (2006). "Sugar Preferences in Nectar- and Fruit-Eating Birds: Behavioral Patterns and Physiological Causes". Biotropica. 38 (1): 3–15. doi:10.1111/j.1744-7429.2006.00104.x.  ^ "The evolution of bat pollination: a phylogenetic perspective". Annals of Botany. 104: 1017–1043. doi:10.1093/aob/mcp197.  ^ a b Von Helversen D; MW Holderied & O Von Helversen (2003). "Echoes of bat-pollinated bell-shaped flowers: conspicuous for nectar-feeding bats?" (abstract page). Journal of Experimental Biology. 206 (6): 1025–1034. doi:10.1242/jeb.00203. PMID 12582145.  ^ Pettersson S; F Ervik & JT Knudsen (2004). "Floral scent of bat-pollinated species: West Africa vs. the New World". Biological Journal of the Linnean Society. 82 (2): 161–168. doi:10.1111/j.1095-8312.2004.00317.x.  ^ Stroo, A. (2000). "Pollen morphological evolution in bat pollinated plants". Plant Systematics and Evolution. 222 (1–4): 225–242. doi:10.1007/BF00984104.  ^ P.J. Gullan & P.S. Cranston (2005). The Insects: An Outline of Entomology. Blackwell Publishing Ltd. p. 282. ISBN 1-4051-1113-5.  ^ Jones GD, Jones SD (2001). "The uses of pollen and its implication for Entomology". Neotropical Entomology. 30 (3): 314–349. doi:10.1590/S1519-566X2001000300001.  ^ a b Ollerton J.; Johnson S. D.; Cranmer L.; Kellie S. (2003). "The pollination ecology of an assemblage of grassland asclepiads in South Africa". Annals of Botany. 92: 807–834. doi:10.1093/aob/mcg206. PMC 4243623 . PMID 14612378.  ^ a b Ollerton J.; Killick A.; Lamborn E.; Watts S.; Whiston M. (2007). "Multiple meanings and modes: on the many ways to be a generalist flower". Taxon. 56: 717–728. doi:10.2307/25065856.  ^ Buchmann, SL. (1987). "The ecology of oil flowers and their bees". Annual Review of Ecology and Systematics. 18 (1): 343–70. doi:10.1146/annurev.es.18.110187.002015.  ^ Fulton M & Hodges SA (1999). "Floral isolation between Aquilegia formosa and A. pubescens.". Proceedings of the Royal Society B: Biological Sciences. 266 (1435): 2247–2252. doi:10.1098/rspb.1999.0915.  ^ Hodges SA; JB Whittall; M Fulton & JY Yang (2002). "Genetics of floral traits influencing reproductive isolation between Aquilegia formosa and A. pubescens". American Naturalist. 159 (s3): S51–S60. doi:10.1086/338372. PMID 18707369.  ^ Gegear, RJ & TM Laverty (2005). "Flower constancy in bumblebees: a test of the trait variability hypothesis". Animal Behaviour. 69 (4): 939–949. doi:10.1016/j.anbehav.2004.06.029.  ^ Pettersson MW (1991). "Pollination by a guild of fluctuating moth populations: option for unspecialization in Silene vulgaris". Journal of Ecology. British Ecological Society. 79 (3): 591–604. doi:10.2307/2260655. JSTOR 2260655.  ^ a b c Waser, NM, L Chittka, MV Price, NM Williams and J. Ollerton (1996). "Generalization in pollination systems, and why it matters" (PDF). Ecology. Ecological Society of America. 77 (4): 1043–1060. doi:10.2307/2265575. JSTOR 2265575. CS1 maint: Multiple names: authors list (link) ^ Ollerton J (1998). "Sunbird surprise for syndromes". Nature. 394: 726–727. doi:10.1038/29409.  ^ Herrera, CM (1996). "Floral traits and adaptation to insect pollinators: a devil's advocate approach". In DG Lloyd; SCH Barrett. Floral Biology. Chapman & Hall, New York. pp. 65–87.  ^ Hingston, AB & PB Mcquillan (2000). "Are pollination syndromes useful predictors of floral visitors in Tasmania?". Australian Journal of Ecology. 25 (6): 600–609. doi:10.1046/j.1442-9993.2000.01059.x.  ^ Wilson, P, M Castellanos, JN Hogue, JD Thomson and WS Armbruster (2004). "A multivariate search for pollination syndromes among penstemons". Oikos. 104 (2): 345–361. doi:10.1111/j.0030-1299.2004.12819.x. CS1 maint: Multiple names: authors list (link)


Bibliography[edit] Faegri, K.; Pijl, L. Van Der (1980) [1966]. Principles of Pollination Ecology (3rd ed.). Elsevier. ISBN 978-1-4832-9303-5.  Retrieved from "https://en.wikipedia.org/w/index.php?title=Pollination_syndrome&oldid=810028899" Categories: PollinationFlowersPlant morphologyInsect ecologyEvolutionary biologyHidden categories: CS1 maint: Multiple names: authors list


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