Abstract
The vegetational landscape of north-easternTerairegion at the foot hills of Central Himalayas is a mosaic of grassland, old-field, wasteland, and forest ecosystems. Like many other parts of the country, this region is also infested with alien intruders which not only interfere with the growth and production of food crops but also exercise adverse effects on the biodiversity of native species. The present study attempts to catalogue the invasive alien species of the terrestrial vegetation of north-eastern Uttar Pradesh especially with reference to their habit, taxonomic position, and nativity. A total of 1135 plant species within 580 genera under 119 families are so far known to occur in the region. Of these, only 149 species within 100 genera under 41 families have been found to be invasive aliens as evident from their center of origin, past history, nature of aggregation, and invasion observed under field conditions. About 80% of these invaders have been introduced from neotropics. Out of 173 invasive plants across India, this region shares 149 species, out of which 66% of species have come from Tropical America, 14% from African continent, and the rest from other countries. A better planning in the form of early identification and reporting of infestation and spread of noxious weeds is needed for their control.
Highlights
Invasion of alien plant species in recent times has been recognized as the second worst threat after habitat destruction [1]
A total of 149 species of invasive aliens of the terrestrial vegetation of north-eastern Uttar Pradesh have been documented. These 149 alien species belonged to 100 genera under 41 families
The alien species amounted to 13.1% of 1135 wild terrestrial plant species of the region
Summary
Invasion of alien plant species in recent times has been recognized as the second worst threat after habitat destruction [1]. The ecological approach to plant invasion has been mostly based on (a) biological and ecological features promoting the invasion success of particular species [3, 4] and (b) the character and invasibility of invaded communities [5]. After successful establishment few naturalized species disperse and produce viable offsprings in areas far from the sites of their introduction The study area (∼10,000 km2; 27∘5 to 27∘40N latitude and 83∘30 to 84∘E longitude) falls in Gorakhpur district of Uttar Pradesh state It is bounded by Nepal in the north and Bihar state of India in the east. In the northern area there are a few elevated mounds, locally called dhus, which range in size from a few hundred meters to 4-5 km and have brown sandy soil
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