Effect of Invasive species on
Flora and Fauna.
Presented By-Anjali Rajput
Seminar / (G.D.) Presentation on
Zom801- Wildlife Techniques
What is the issue?
● Alien or non-native or invasive species
are animals, plants or other organisms
introduced by humans and other means,
either intentionally or accidentally, into
areas outside their natural range.
● Some of these species become
established and negatively impact native
Effect on Species and Communities
● Lonicera japonica (Japanese honeysuckle) inhibited the reproduction of dominant forest trees such as
Liriodendron tulipifera (tulip poplar), Prunus serotina (wild black cherry)
Effect on Ecosystem Properties
● In the Wildman Reserve in northern Australia, invasion of Andropogon gayanus (gamba
grass) increased fuels loads by up to seven times, and increased fire intensity by up to eight
times compared to areas with native grasses
Effect on Biogeochemistry and Ecosystem
● In Hawaii Volcanoes NP, nitrogen-fixing species (Morella faya and M. cereifera)
significantly increase soil nitrogen availability, by up to 400 %. These changes
resulted in altered succession trajectories
Effect on Ecosystem Services
● Under Millennium Ecosystem Assessment :-
● Provisioning - genetic resources
● Regulating- governing functions
● Cultural services.--cultural heritage, recreation/tourism, aesthetic values,
Effect on Economic Impact
● The costs of controlling Rhododendron ponticum (rhododendron) invasion in the Snowdonia NP,
Wales, was estimated to be £45 million .
● Impatiens glandulifera (Himalayan balsam) is an annual plant native to Asia currently invasive in
many protected areas in Europe Introduced as a garden ornamental and still frequently planted, it
spreads into semi-natural plant communities along water courses.
Other impacts :-
● Resource competition– with introduced water
hyacinth from S. America
● Predation– introduced Nile perch drove hundreds of
cichlid fishes extinct
● Parasitism– South Pacific snail Partula turigida
driven extinct following infection with microsporidian
parasite called Steinhausia.
● Disease transmission– Dutch elm disease (beetle
transmitted fungus Ophiostoma ulmi, that kills
● HIV in humans. Etc