Adventive plant
Adventive plants or adventitious plants are plants that have established themselves in a place that does not correspond to their area of origin due to anthropogenic influence and, therefore, are all wild species that have only been established with the help of humans, in contrast to the native species.
Term
The term "adventive" is used to describe species that are not self-sufficient, but need an episodic
The term hemerochory is sometimes used synonymously with this one, but is often restricted to species that were unintentionally brought into the area and then naturalized, sometimes also for species that have firmly established themselves in their new habitat.
Categorization
Depending on the question and perspective, adventitious plants are divided into different subcategories:
Classification according to establishment history
- Archaeophytes were introduced before 1492
- Neophytes were introduced or immigrated after 1492.
The year 1492 is a conventionally chosen reference point. With the "discovery" of America and the
Classification according to the degree of establishment
- Agriophytes: species that have invaded natural or near-natural vegetation and could survive there without human intervention.[2][3]
- Epecophytes: Species that are only naturalized in vegetation units shaped by humans, such as meadows, weed flora or ruderal vegetation, but are firmly naturalized here.[4]
- Ephemerophytes: Species that are only introduced inconsistently, that will die out of culture for a short period of time, or that would disappear again without a constant replenishment of seeds.[5]
Classification according to immigration route
Spontaneous immigrants (sometimes referred to as "acolutophytes") immigrated on their own without direct human assistance, for example when new locations were created through culture or soil changes. Companions (sometimes also "xenophytes") were brought in through human transport. Examples would be seed companions, which were unintentionally sown due to their similarity to cultivated plant seeds, or “wool adventures”, which were dragged into the wool fleece during the transport of sheep's wool.
Feral species or cultural refugees in the narrower sense are those that were originally cultivated, but later escaped from the culture and were able to spread on their own. Such descendants of original cultural clans are subject to natural evolution as they become wild and can more or less quickly differ both from the culture form itself and from the original wild clan that preceded the culture.
Habitat
Adventitious plants are often found at
The proportion of adventitious species in open ruderal corridors at such locations can exceed 30% of the flora of these locations. In natural and near-natural vegetation, adventitious plants are much rarer. Their share here is between zero and about 5%.[6]
References
- ^ Invasive? Naturalized? Adventive? by Ben Faber from Agriculture and Natural Resources, University of California. November 6, 2019.
- ^ Handbook of Plant Palaeoecology, Flora and Vegetation, p.95 By R. T. J. Cappers, R. Neef
- ^ Plant Ecology, p.496 By Ernst-Detlef Schulze, Erwin Beck, Klaus Müller-Hohenstein
- ^ Potentials and Limitations of Ecosystem Analysis, Extinction and Naturalization of Plant Species p.261, edited by Ernst-Detlef Schulze, Helmut Zwölfer
- ^ Ingolf Kühn, Stefan Klotz: Floristic status and alien species. In: Series of publications for vegetation science. 38 (2002), pp. 47-56.
- ^ Wilhelm Lohmeyer, Herbert Sukopp: Agriophytes in the vegetation of Central Europe. First addendum. 2001 (Braunschweiger Geobotanische Arbeit 8), pp. 179–220
Further reading
- FG Schroeder: On the classification of the anthropochores. In: Vegetatio. 16, pp. 225-238 (1969).