Contents 1 Benefits 2 Types 2.1 Autochory 2.1.1 Gravity 2.1.2 Ballistic dispersal 2.2 Allochory 2.2.1 Wind 2.2.2 Water 2.2.3 By animals 2.2.4 By humans 3 Consequences 4 See also 5 References 6 Further reading 7 External links

Benefits[edit] Seed dispersal is likely to have several benefits for plant species. First, seed survival is often higher away from the parent plant. This higher survival may result from the actions of density-dependent seed and seedling predators and pathogens, which often target the high concentrations of seeds beneath adults.[1] Competition with adult plants may also be lower when seeds are transported away from their parent. Seed dispersal also allows plants to reach specific habitats that are favorable for survival, a hypothesis known as directed dispersal. For example, Ocotea endresiana (Lauraceae) is a tree species from Latin America which is dispersed by several species of birds, including the three-wattled bellbird. Male bellbirds perch on dead trees in order to attract mates, and often defecate seeds beneath these perches where the seeds have a high chance of survival because of high light conditions and escape from fungal pathogens.[2] In the case of fleshy-fruited plants, seed-dispersal in animal guts (endozoochory) often enhances the amount, the speed, and the asynchrony of germination, which can have important plant benefits.[3] Seeds dispersed by ants (myrmecochory) are not only dispersed short distances but are also buried underground by the ants. These seeds can thus avoid adverse environmental effects such as fire or drought, reach nutrient-rich microsites and survive longer than other seeds.[4] These features are peculiar to myrmecochory, which may thus provide additional benefits not present in other dispersal modes.[5] Finally, at another scale, seed dispersal may allow plants to colonize vacant habitats and even new geographic regions.[6] Dispersal distances and deposition sites depend on the movement range of the disperser, and longer dispersal distances are sometimes accomplished through diplochory, the sequential dispersal by two or more different dispersal mechanisms. In fact, recent evidence suggests that the majority of seed dispersal events involves more than one dispersal phase.[7]

Types[edit] Seed dispersal is sometimes split into autochory (when dispersal is attained using the plant's own means) and allochory (when obtained through external means). Long Distance Dispersal of Seeds Long distance seed dispersal (LDD) is a type of spatial dispersal that is currently defined by two forms, proportional and actual distance. A plant's fitness and survival may heavily depend on this method of seed dispersal depending on certain environmental factors. The first form of LDD, proportional distance, measures the percentage of seeds (1% out of total number of seeds produced) that travel the farthest distance out of a 99% probability distribution.[8][9] The proportional definition of LDD is in actuality a descriptor for more extreme dispersal events. An example of LDD would be that of a plant developing a specific dispersal vector or morphology in order to allow for the dispersal of its seeds over a great distance. The actual or absolute method identifies LDD as a literal distance. It classifies 1 km as the threshold distance for seed dispersal. Here, threshold means the minimum distance a plant can disperse its seeds and have it still count as LDD.[10][9] There is a second, unmeasurable, form of LDD besides proportional and actual. This is known as the non-standard form. Non-standard LDD is when seed dispersal occurs completely at random. An example of this would be if the lemur dependent dispersal of seeds from the deciduous trees of Madagascar were to wash ashore the coastline of South Africa via the attachment of mermaid purses laid by a shark or common skate.[11][12][13][6] A driving factor for the evolutionary significance of LDD is that it increases plant fitness by decreasing neighboring plant competition for offspring. However, it is still unclear today as to how specific traits, conditions and trade-offs (particularly within short seed dispersal) effect LDD evolution. Autochory[edit] Autochorous plants disperse their seed without any help from an external vector, as a result this limits plants considerably as to the distance they can disperse their seed.[14] Two other types of autochory not described in detail here are blastochory, where the stem of the plant crawls along the ground to deposit its seed far from the base of the plant, and herpochory (the seed crawls by means of trichomes and changes in humidity).[15] Gravity[edit] Barochory or the plant use of gravity for dispersal is a simple means of achieving seed dispersal. The effect of gravity on heavier fruits causes them to fall from the plant when ripe. Fruits exhibiting this type of dispersal include apples, coconuts and passionfruit and those with harder shells (which often roll away from the plant to gain more distance). Gravity dispersal also allows for later transmission by water or animal.[16] Ballistic dispersal[edit] Ballochory is a type of dispersal where the seed is forcefully ejected by explosive dehiscence of the fruit. Often the force that generates the explosion results from turgor pressure within the fruit or due to internal tensions within the fruit.[14] Some examples of plants which disperse their seeds autochorously include: Impatiens spp., Arceuthobium spp., Ecballium spp., Geranium spp., Cardamine hirsuta and others. An exceptional example of ballochory is Hura crepitans—this plant is commonly called the dynamite tree due to the sound of the fruit exploding. The explosions are powerful enough to throw the seed up to 100 meters.[17] Allochory[edit] Allochory refers to any of many types of seed dispersal where a vector or secondary agent is used to disperse seeds. This vectors may include wind, water, animals or others. Wind[edit] Wind dispersal of dandelion seeds Entada phaseoloides – Hydrochory Wind dispersal (anemochory) is one of the more primitive means of dispersal. Wind dispersal can take on one of two primary forms: seeds can float on the breeze or alternatively, they can flutter to the ground.[18] The classic examples of these dispersal mechanisms, in the temperate northern hemisphere, include dandelions, which have a feathery pappus attached to their seeds and can be dispersed long distances, and maples, which have winged seeds (samaras) and flutter to the ground. An important constraint on wind dispersal is the need for abundant seed production to maximize the likelihood of a seed landing in a site suitable for germination. There are also strong evolutionary constraints on this dispersal mechanism. For instance, Cody and Overton (1996) found that species in the Asteraceae on islands tended to have reduced dispersal capabilities (i.e., larger seed mass and smaller pappus) relative to the same species on the mainland.[19] Also, Helonias bullata, a species of perennial herb native to the United States, evolved to utilize wind dispersal as the primary seed dispersal mechanism; however, limited wind in its habitat prevents the seeds to successfully disperse away from its parents, resulting in clusters of population.[20] Reliance on wind dispersal is common among many weedy or ruderal species. Unusual mechanisms of wind dispersal include tumbleweeds, where the entire plant is blown by the wind. Physalis fruits, when not fully ripe, may sometimes be dispersed by wind due to the space between the fruit and the covering calyx which acts as air bladder. Water[edit] Many aquatic (water dwelling) and some terrestrial (land dwelling) species use hydrochory, or seed dispersal through water. Seeds can travel for extremely long distances, depending on the specific mode of water dispersal; this especially applies to fruits which are waterproof and float. The water lily is an example of such a plant. Water lilies' flowers make a fruit that floats in the water for a while and then drops down to the bottom to take root on the floor of the pond. The seeds of palm trees can also be dispersed by water. If they grow near oceans, the seeds can be transported by ocean currents over long distances, allowing the seeds to be dispersed as far as other continents. Mangrove trees grow directly out of the water; when their seeds are ripe they fall from the tree and grow roots as soon as they touch any kind of soil. During low tide, they might fall in soil instead of water and start growing right where they fell. If the water level is high, however, they can be carried far away from where they fell. Mangrove trees often make little islands as dirt and other things collect in their roots, making little bodies of land. A special review for oceanic waters hydrochory can be seen at oceanic dispersal. The "bill" and seed dispersal mechanism of Geranium pratense By animals[edit] The small hooks on the surface of a bur enable attachment to animal fur for dispersion. Animals can disperse plant seeds in several ways, all named zoochory. Seeds can be transported on the outside of vertebrate animals (mostly mammals), a process known as epizoochory. Plant species transported externally by animals can have a variety of adaptations for dispersal, including adhesive mucus, and a variety of hooks, spines and barbs.[21] A typical example of an epizoochorous plant is Trifolium angustifolium, a species of Old World clover which adheres to animal fur by means of stiff hairs covering the seed.[6] Epizoochorous plants tend to be herbaceous plants, with many representative species in the families Apiaceae and Asteraceae.[21] However, epizoochory is a relatively rare dispersal syndrome for plants as a whole; the percentage of plant species with seeds adapted for transport on the outside of animals is estimated to be below 5%.[21] Nevertheless, epizoochorous transport can be highly effective if seeds attach to wide-ranging animals. This form of seed dispersal has been implicated in rapid plant migration and the spread of invasive species.[6] Seed dispersal via ingestion by vertebrate animals (mostly birds and mammals), or endozoochory, is the dispersal mechanism for most tree species.[22] Endozoochory is generally a coevolved mutualistic relationship in which a plant surrounds seeds with an edible, nutritious fruit as a good food for animals that consume it. Birds and mammals are the most important seed dispersers, but a wide variety of other animals, including turtles and fish, can transport viable seeds.[23] The exact percentage of tree species dispersed by endozoochory varies between habitats, but can range to over 90% in some tropical rainforests.[22] Seed dispersal by animals in tropical rainforests has received much attention, and this interaction is considered an important force shaping the ecology and evolution of vertebrate and tree populations.[24] In the tropics, large animal seed dispersers (such as tapirs, chimpanzees and hornbills) may disperse large seeds with few other seed dispersal agents. The extinction of these large frugivores from poaching and habitat loss may have negative effects on the tree populations that depend on them for seed dispersal.[25] A variation of endozoochory is regurgitation rather than all the way through the digestive track.[26] Seed dispersal by ants (myrmecochory) is a dispersal mechanism of many shrubs of the southern hemisphere or understorey herbs of the northern hemisphere.[4] Seeds of myrmecochorous plants have a lipid-rich attachment called the elaiosome, which attracts ants. Ants carry such seeds into their colonies, feed the elaiosome to their larvae and discard the otherwise intact seed in an underground chamber.[27] Myrmecochory is thus a coevolved mutualistic relationship between plants and seed-disperser ants. Myrmecochory has independently evolved at least 100 times in flowering plants and is estimated to be present in at least 11 000 species, but likely up to 23 000 or 9% of all species of flowering plants.[4] Myrmecochorous plants are most frequent in the fynbos vegetation of the Cape Floristic Region of South Africa, the kwongan vegetation and other dry habitat types of Australia, dry forests and grasslands of the Mediterranean region and northern temperate forests of western Eurasia and eastern North America, where up to 30–40% of understorey herbs are myrmecochorous.[4] Seed predators, which include many rodents (such as squirrels) and some birds (such as jays) may also disperse seeds by hoarding the seeds in hidden caches.[28] The seeds in caches are usually well-protected from other seed predators and if left uneaten will grow into new plants. In addition, rodents may also disperse seeds via seed spitting due to the presence of secondary metabolites in ripe fruits.[29] Finally, seeds may be secondarily dispersed from seeds deposited by primary animal dispersers, a process known as diplochory. For example, dung beetles are known to disperse seeds from clumps of feces in the process of collecting dung to feed their larvae.[30] Other types of zoochory are chiropterochory (by bats), malacochory (by molluscs, mainly terrestrial snails), ornithochory (by birds) and saurochory (by non-bird sauropsids). Zoochory can occur in more than one phase, for example through diploendozoochory, where a primary disperser (an animal that ate a seed) along with the seeds it is carrying is eaten by a predator that then carries the seed further before depositing it.[31] By humans[edit] Epizoochory in Bidens tripartita; the seeds have attached to the clothes of a human. Play media Seed dispersal by a car Dispersal by humans (anthropochory) used to be seen as a form of dispersal by animals. Recent research points out that human dispersers differ from animal dispersers by a much higher mobility based on the technical means of human transport.[32] Dispersal by humans on the one hand may act on large geographical scales and lead to invasive species. On the other hand, dispersal by humans also acts on smaller, regional scales and drives the dynamics of existing biological populations.[33] Humans may disperse seeds by many various means and some surprisingly high distances have been repeatedly measured.[34] Examples are: dispersal on human clothes (up to 250 m),[35] on shoes (up to 5 km)[32] or by cars (regularly ~ 250 m, singles cases > 100 km).[36] Deliberate seed dispersal also occurs as seed bombing. This has risks as unsuitable provenance may introduce genetically unsuitable plants to new environments.

Consequences[edit] Seed dispersal has many consequences for the ecology and evolution of plants. Dispersal is necessary for species migrations, and in recent times dispersal ability is an important factor in whether or not a species transported to a new habitat by humans will become an invasive species.[37] Dispersal is also predicted to play a major role in the origin and maintenance of species diversity. For example, myrmecochory increased the rate of diversification more than twofold in plant groups in which it has evolved because myrmecochorous lineages contain more than twice as many species as their non-myrmecochorous sister groups.[38] Dispersal of seeds away from the parent organism has a central role in two major theories for how biodiversity is maintained in natural ecosystems, the Janzen-Connell hypothesis and recruitment limitation.[1] Seed dispersal is essential in allowing forest migration of flowering plants. In addition, the speed and direction of wind are highly influential in the dispersal process and in turn the deposition patterns of floating seeds in the stagnant water bodies. The transportation of seeds is led by the wind direction. This effects colonization situated on the banks of a river or to wetlands adjacent to streams relative to the distinct wind directions. The wind dispersal process can also effect connections between water bodies. Essentially, wind plays a larger role in the dispersal of waterborne seeds in a short period of time, days and seasons, but the ecological process allows the process to become balanced throughout a time period of several years. The time period of which the dispersal occurs is essential when considering the consequences of wind on the ecological process.

See also[edit] Biological dispersal Biantitropical distribution Diplochory Disturbance (ecology) Dormancy – "dispersal in time" Elaiosome Gene flow Habitat fragmentation Island hopping Landscape ecology Metapopulation Myrmecochory Oceanic dispersal Population ecology Seed dispersal syndrome

References[edit] ^ a b Harms, K; Wright, SJ; Calderon, O; Hernandez, A; Herre, EA (2000). "Pervasive density-dependent recruitment enhances seedling diversity in a tropical forest". Nature. 404 (6777): 493–495. Bibcode:2000Natur.404..493H. doi:10.1038/35006630. PMID 10761916.  ^ Wenny, D.G. & Levey, D.J. (1998). "Directed seed dispersal by bellbirds in a tropical cloud forest". Proceedings of the National Academy of Sciences of the United States of America. 95 (11): 6204–7. Bibcode:1998PNAS...95.6204W. doi:10.1073/pnas.95.11.6204. PMC 27627 . PMID 9600942.  ^ Fedriani, J. M., Delibes, M. (2009). "Functional diversity in fruit-frugivore interactions: A field experiment with Mediterranean mammals". Ecography. 32 (6): 983. doi:10.1111/j.1600-0587.2009.05925.x. CS1 maint: Multiple names: authors list (link) ^ a b c d Lengyel, S.; et al. (2010). "Convergent evolution of seed dispersal by ants, and phylogeny and biogeography in flowering plants: a global survey". Perspectives in Plant Ecology, Evolution and Systematics. 12 (1): 43–55. doi:10.1016/j.ppees.2009.08.001.  ^ Manzaneda, Antonio J.; Fedriani, Jose M. & Rey, Pedro J. (2005). "Adaptive advantages of myrmecochory: the predator-avoidance hypothesis tested over a wide geographic range" (PDF). Ecography. 28 (5): 583–592. doi:10.1111/j.2005.0906-7590.04309.x.  ^ a b c Manzano, Pablo; Malo, Juan E. (2006). "Extreme long-distance seed dispersal via sheep". Frontiers in Ecology and the Environment. 4 (5): 244–248. doi:10.1890/1540-9295(2006)004[0244:ELSDVS]2.0.CO;2. JSTOR 3868790.  ^ OZINGA, WIM A.; BEKKER, RENEE M.; SCHAMINEE, JOOP H. J.; VAN GROENENDAEL, JAN M. (October 2004). "Dispersal potential in plant communities depends on environmental conditions". Journal of Ecology. 92 (5): 767–777. doi:10.1111/j.0022-0477.2004.00916.x.  ^ Higgins, Steven I.; Richardson, David M., (May 1999). "Predicting Plant Migration Rates in a Changing World: The Role of Long‐Distance Dispersal". The American Naturalist. 153 (5): 464–475. doi:10.1086/303193.  ^ a b Ran, Nathan; Schurr, Frank M.; Spiegel, Orr; Steinitz, Ofer; Trakhtenbrot, Ana; Tsoar, Asaf (November 2008). "Mechanisms of long-distance seed dispersal". Trends in Ecology and Evolution. 23 (11): 638–647. doi:10.1016/j.tree.2008.08.003. PMID 18823680.  ^ Østergaard, Lars J. (2010). Annual Plant Reviews, Fruits Development and Seed Dispersal (first ed.). United Kingdom: Blackwell Publishing. pp. 204–205. ISBN 978-1-4051-8946-0.  ^ Jörg, Ganzhorn U.; Fietz, Joanna; Rakotovao, Edmond; Schwab, Dorothea; Dietmar, Zinner (August 1999). "Lemurs and the Regeneration of Dry Deciduous Forest in Madagascar". Conservation Biology. 13 (4): 794–804. doi:10.1046/j.1523-1739.1999.98245.x.  ^ Ran, Nathan (August 11, 2006). "Long-Distance Dispersal of Plants". Science. 313 (5788): 786–788. Bibcode:2006Sci...313..786N. doi:10.1126/science.1124975.  ^ Craig & Griffiths, Charles Smith (October 1997). Shark and skate egg-cases cast up ashore two South African beaches and their rates of hatching success, or causes of death. NISC (Pty) Ltd. pp. 112–117. ISSN 1562-7020.  ^ a b Vittoz, Pascal; Engler, Robin (7 February 2008). "Seed dispersal distances: a typology based on dispersal modes and plant traits" (PDF). Botanica Helvetica. 117 (2): 109–124. doi:10.1007/s00035-007-0797-8. Retrieved 23 June 2016. [dead link] ^ Schulze, Ernst-Detlef; Beck, Erwin & Müller-Hohenstein, Klaus (2005). Plant Ecology. Springer. pp. 543–. ISBN 978-3-540-20833-4.  ^ "Dispersal of seeds by gravity". Retrieved 2009-05-08.  ^ Feldkamp, Susan (2006). Modern Biology. United States: Holt, Rinehart, and Winston. p. 618.  ^ Gurevitch, J., Scheiner, S.M., & G.A. Fox (2006). Plant Ecology, 2nd ed. Sinauer Associates, Inc., Massachusetts. ^ Cody, M.L. & Overton, J.M. (1996). "Short-term evolution of reduced dispersal in island plant populations". Journal of Ecology. 84: 53–61. doi:10.2307/2261699. JSTOR 2261699.  ^ Godt, Mary (June 1995). "Genetic Diversity in a Threatened Wetland Species, Helonias bullata (Liliaceae)". Conservation Biology. Wiley for Society for Conservation Biology. 9 (3): 596–604. doi:10.1046/j.1523-1739.1995.09030596.x. JSTOR 2386613.  ^ a b c Sorenson, A.E. (1986). "Seed dispersal by adhesion". Annual Review of Ecology and Systematics. 17: 443–463. doi:10.1146/  ^ a b Howe, H. F. & Smallwood J. (1982). "Ecology of Seed Dispersal" (PDF). Annual Review of Ecology and Systematics. 13: 201–228. doi:10.1146/  ^ Corlett, R.T. (1998). "Frugivory and seed dispersal by vertebrates in the Oriental (Indomalayan) Region". Biological Reviews. 73 (4): 413–448. doi:10.1017/S0006323198005234. PMID 9951414.  ^ Terborgh, J. (1986) "Community aspects of frugivory in tropical forests": in Fleming, T.H.; Estrada, Alejandro (eds.) Frugivory and Seed Dispersal, Advances in Vegetation Science, Vol. 15, Springer, ISBN 978-0-7923-2141-5. ^ Chapman, C.A. & Onderdonk, D.A. (1998). "Forests without primates: primate/plant codependency". American Journal of Primatology. 45 (1): 127–141. doi:10.1002/(SICI)1098-2345(1998)45:1<127::AID-AJP9>3.0.CO;2-Y. PMID 9573446.  ^ Delibes, Miguel; Castañeda, Irene; Fedriani, José M (2017). "Tree-climbing goats disperse seeds during rumination". Frontiers in Ecology and the Environment. 15 (4): 222. doi:10.1002/fee.1488.  ^ Giladi, I. (2006). "Choosing benefits or partners: a review of the evidence for the evolution of myrmecochory". Oikos. 112 (3): 481–492. doi:10.1111/j.0030-1299.2006.14258.x.  ^ Forget, P.M. & Milleron, T. (1991). "Evidence for secondary seed dispersal by rodents in Panama". Oecologia. 87 (4): 596–599. doi:10.1007/BF00320426. PMID 28313705.  ^ Samuni-Blank, M.; et al. (2012). "Intraspecific directed deterrence by the mustard oil bomb in a desert plant". Current Biology. 22 (13): 1–3. doi:10.1016/j.cub.2012.04.051. PMID 22704992.  ^ Andresen E. & Levey, D.J. (2004). "Effects of dung and seed size on secondary dispersal, seed predation, and seedling establishment of rainforest trees". Oecologia. 139 (1): 45–54. doi:10.1007/s00442-003-1480-4. PMID 14740290.  ^ Hämäläinen, Anni; Broadley, Kate; Droghini, Amanda; Haines, Jessica A.; Lamb, Clayton T.; Boutin, Stan; Gilbert, Sophie (February 2017). "The ecological significance of secondary seed dispersal by carnivores". Ecosphere. 8 (2): e01685. doi:10.1002/ecs2.1685.  ^ a b Wichmann, M.C.; Alexander, M.J.; Soons, M.B.; Galsworthy, S.; Dunne, L.; Gould, R.; Fairfax, C.; Niggemann, M.; Hails, R.S. & Bullock, J.M. (2009). "Human mediated dispersal of seeds over long-distances". Proceedings of the Royal Society B. 276 (1656): 523–532. doi:10.1098/rspb.2008.1131. PMC 2664342 . PMID 18826932.  ^ Chaloupka, M. Y.; Domm, S. B. (Dec 1986). "Role of Anthropochory in the Invasion of Coral Cays by Alien Flora". Ecology. Ecological Society of America. 67 (6): 1536–1547. doi:10.2307/1939084. JSTOR 1939084.  ^ "Anthropochory or Human-Mediated Dispersal (HMD)". Frugivores and Seed Dispersal Symposium. June 2010.  ^ Bullock, S. H. & Primack, R. B. (1977). "Comparative experimental study of seed dispersal on animals". Ecology. 58 (3): 681–686. doi:10.2307/1939019.  ^ von der Lippe, M. & Kowarik, I. (2007). "Long-distance dispersal of plants by vehicles as a driver of plant invasions". Conservation Biology. 21 (4): 986–996. doi:10.1111/j.1523-1739.2007.00722.x. PMID 17650249.  ^ Caswell, H.; Lensink, R.; Neubert, M.G. (2003). "Demography And Dispersal: Life Table Response Experiments For Invasion Speed". Ecology. 84 (8): 1968–1978. doi:10.1890/02-0100.  ^ Lengyel, S.; et al. (2009). Chave, Jerome, ed. "Ants Sow the Seeds of Global Diversification in Flowering Plants". PLoS ONE. 4 (5): e5480. Bibcode:2009PLoSO...4.5480L. doi:10.1371/journal.pone.0005480. PMC 2674952 . PMID 19436714. 

Further reading[edit] Ridley, Henry N (1930). The Dispersal of Plants Throughout the World. Ashford, Kent: L. Reeve & Co. ISBN 0-85393-004-X. 

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