Hemerochory (Ancient Greek ἥμερος, hemeros: 'tame, ennobled, cultivated, cultivated' and Greek χωρίς choris: separate, isolated), oranthropochory,[1][2] is thedistribution of cultivated plants or their seeds andcuttings, consciously or unconsciously, by humans into an area that they could not colonize through their natural mechanisms of spread, but are able to maintain themselves without specific human help in their new habitat.[3]
Hemerochory is one of the mainpropagation mechanisms of a plant.Hemerochoric plants can both increase and decrease thebiodiversity of a habitat.[4]
Hemerochoric plants are classified according to the manner of introduction into, for example:
_Sweet_(AM_AK347534-4).jpg)
Chronologically the hemerochoric plants are divided in:
Anthropochory is often used synonymously but does not mean exactly the same. Anthropochory is the spread by humans. The spread throughdomestic animals does not belong to the anthropochoric, but to the hemerochoric, because domestic animals belong to the human culture. Strictly speaking, anthropochoric means the spread through humans as a transport medium. These can also be native species that were either adapted from the outset to locations created by human cultural activity or have adapted to them afterwards; As a result, their area of distribution has often, but not always, increased.
Hemerochorous spread of plants through human cultural activity very likely already happened in theStone Age, but demonstrably at the latest inantiquity, namely along oldtrade routes. Fruits such as apples and pears gradually made their way along theSilk Road from the area around theAltai Mountains toGreece and from there to the gardens of theRomans, who in turn brought these cultivated plants to Central Europe, and some of these plants were eventually able to survive outside the culture. Many useful plants, such as tomato, potato, pumpkin andFrench bean did not reach Central Europe until the 16th century, after the American continent was discovered, and are now grown worldwide.
In the last 400 to 500 years the spread has expanded through trade and military campaigns, through explorers andmissionaries. The latter brought countless plants with them from their travels both out of an interest inexotic plants, which were often included in the plant collections of princely courts, and for purely scientific purposes. In the context of botanical studies, the interest was often in the possiblehealing effects of these plants, but also in the expansion of botanical knowledge, or the plants were only used for collecting (herbaria).
Some ornamental plants also came to Europe because they promised a lucrative business. This applies, for example, to thecamellias, one of which is also grown as a tea plant in Japan and China. While this species turned out to be not cultivable in Central Europe, people very quickly discovered the aesthetic appeal of the other camellia species as an ornamental plant. Botanical gardens played a major role in the acclimatization of such plants from distant habitats.[6]
Agochoric plants are those that are spread through accidental transport. Unlike speirochoric plants, they are usually not sown on human-prepared soil. On land, agochoric plants used to be common in harbors, attrain stations or alongrailway lines.[7]
However, mainlyaquatic plants are spread through agochory.Ballast water plays a major role in the agochoric spread of aquatic plants. Around the world, around ten billion tons of seawater and the organisms it contains are shipped in this way.Exporting countries in particular are affected by the spread of organisms through ballast water. The ships arrive at the ports with emptycargo hold, but fully pumped ballast tanks. In the draining of this ballast water, these ports receive thousands of cubic meters of seawater brimming with alien creatures now in a new environment. The seaweedUndaria pinnatifida, which is native to the Japanese coast, reached theTasmanian coast via ballast water and has formed densekelp forests along the coast since 1988, displacing the native flora and fauna.Caulerpa taxifolia is one of those plants that are often spread by ballast water. It is also spread by the fact that ships tear off parts of the algae with their anchors.
Australia was the first country to introduce a ballast water policy back in 1990 and is now the most determined to address this problem. Ships were asked not to take in ballast water in shallow and polluted bays and not to refuel with ballast water during the night, since then manymarine organisms that are otherwise on theseabed rise to the surface of the water. Ships should also exchange their ballast water 200 kilometers away from the coastal waters, so that on the one hand the offshore species are not introduced into the more sensitive coastal waters and, on the other hand, no inhabitants of the coastal zone are transported to other continents.[8]
Ethelochory is intentional transportation of plants or seeds to different regions for agricultural and gardening purposes.[9] Numerous crops that are important for human nutrition have been willingly spread by humans.Wheat,barley,lentil,beans,flax and poppy seeds, for example, are not typical plants forCentral Europe, although they are all archaeotypes. People brought them after the beginning of theNeolithic (about 6,500 years ago) gradually from theeastern Mediterranean to central Europe and the rest of the world through the upcoming centuries. In central Europe, it is especiallyCyperus esculentus which has been classified since the 1980s among theinvasive species, because theirtubers have been spread en masse, by sticking to vehicles or machines.[10]
Many of the old cultivated plants have spread around the world, primarily through emigrants from Europe. Grown for at least 4,000 years, wheat was introduced to America in the 16th century and Australia in the 19th century. Orange, lemons, apricots and peaches were originally native to China. They probably came via the Silk Road as early as the3rd century BC. InAsia Minor and from there through theRomans to the Mediterranean. European settlers, in turn, used these species to grow fruit in suitable regions of America.
From the 16th century, ornamental plants were grown more and more. Species native to Europe were first introduced asgarden plants. These include, for example, thegladioli, theornamental onion,European bluebell, thesnowdrop native to southeast Europe and the commonclematis. Ornamental plants from more distant regions were added later. FromEast Asia in particular, a number of plants were introduced to Europe as exotic or for economic reasons.
Some plants were unintentionally introduced in this process; this unwanted hemerochory as a seed companion is calledspeirochory. Since every seed also contains seeds of the herbs of the field from which it comes, their competitors, the "weeds", were also sold through the trade in the seeds of the useful plant. The realchamomile is one of the plants that were unintentionally spread as a companion to seeds.[11]
Speirochoric plants are sown on human-prepared soil and are competitors of thecrops. Plants that are considered to be archaeophytes, such as the poppy, native to the Mediterranean area, the real chamomile, thecornflower and fieldbuttercup, spread through the seeds with the grain in Central Europe. In the meantime, the seeds are cleaned more thoroughly using modern methods and the cultivation is hardly contaminated bypesticides or other control techniques.
In spite of this,Cuscuta campestris, which is classified as a problematic weed inAustralia, was accidentally imported into the country together withbasil seeds in 1981, 1988 and 1990.