Ministry of higher and secondary specialized

Why is a species invasive?

“The term “invasive” denotes the biologically aggressive and exceptionally hardy characteristics of a plant, habitually denounced for taking over natural areas and stifling biodiversity. In non-urban conditions, these plants can at times be destructive on rural ecosystems. Monocultures of Tree of Heaven (Ailanthus altissima) or Common Reed (Phragmites australis) have been known to alter radically existing landscapes and wildlife habitats. With many invasive plants dispersing seeds multiple times throughout a season and with seed counts in the thousands per plant annually, the potential for a quick colonization of rural and suburban sites is a major concern.”

How do species become invasive?

Plants and animals are not inherently invasive but become so due to human interference and human relationships with with them. Native species in some locations become invasive species in other locations.
“Plants and animals have always traveled with us. The more we travel, the more species we unknowingly transport. Our transportation methods then become pathways for invasive species. For example, birds or the wind can carry seeds from garden plants into the wild. Exotic pets escape or are released into parks, lakes, and rivers. People can carry seeds on their clothing, in suitcases, or on cars. Packets of birdseed can contain seeds of invasive plants. Solid waste and soil that have invasive plants can be dumped as fill into wetlands. Plant seeds, insects, small animals, and organisms can hide in ship cargoes or ballast water, on the outside of boats, and on planes.”