Though research studies are needed at large on the impacts of invasive species on local/ native flora but here you could find few examples to carry out work on this aspect.
First, Keoladeo National Park, Bharatpur, Rajasthan, India
We all know about the world heritage site wher Prosopis juliflora was dominant invasive species along with Water Hyacinth. In 2007, KNP Forest Department started uprooting of this invasive species. The earlier species are well documented in the work of Bombay Natural History Society (BNHS), Mumbai. Today one could see the revival of native flora specially Salvadora & Acacia spp.
You can compare the flora before invasion of Prosopis juliflora, at the time of P. juliflora and after its removal. Research work could be referenced in your work which is readily available with KNP Forest Department &/or BNHS.
Second, Mount Abu Wildlife Sanctuary, Sirohi, Rajasthan, India
Here you could find the well documented literature on plantation of exotic species specially Eucalyptus and Lantana. Though studies on impact of plantation of these species are lacking but on the basis of the availability of the herbs (which are mainly collected by local people from very past) could be assessed.
Will give you one example of the impact - Species of Carrissa, Rosa and many aquatic species of medicinal value were now no more to see on the table land of the Abu Hills which were once common on this part of hills. Human settlements are mainly on this table land. Further, expansion of the Lantana is taking place through out the hills. Seeds of Lantana are dispersed by the droppings of Bulbul (very common bird) and Sloth Bear (common mammal) in core areas of hills.
The aquatic bodies (pictures from archives) which were once full of local vegetation are now either dried or even lost their existence. One could easily see monoculture Eucalyptus in those aquatic bodies.
Satya Prakash Mehra
Advisor - RSNH & Manger - Project Boond
--- On Sun, 1/8/10, Marianne de Nazareth <mde.na...@gmail.com> wrote:
I agree with Rashida ji. It requires a long observations and scientific research for concluding the effect Climate Change on Lantana spreading.
Now, as far as my knowledge concerned (let me tell you I am not botanist or plant specialist) Lantana invasions are associated with habitat disturbance and readily grows well on nutrient barren soils but requires open canopy for sunlight. For germination its seed requires warm and humid conditions. Once established, the plants are heat- and drought- tolerant. Further, shoots are frost sensitive & growth is reduced below 5˚C and roots do not accept waterlogged conditions.
There are ample of references supporting these characteristics.
With reference to Abu Hills I could only state that it was introduced in 1890s as ornamental plant by Princely family of Alwar in their garden. Mt Abu is Eco-fragile zone notified as Eco-Sensitive Zone recently. The conditions (habitat & climatic) were worsened from late 1980s (as per my knowledge/ work on Abu Hills). Meteorological data are there to show the changes in rainfall pattern and temperature on Abu Hills. The waterlogging conditions were no more to see and forget about the extreme cold conditions on Abu which were common for residents in the past (before 1990s).
Approx. 90 species of
Bryophytes were reported from Abu Hills. One has to find out what’s the number
in the present conditions? As far as my knowledge concerned, one could only
find around 40-50 species at present.
This could be the basis of your work to start up
to work in direction of climate change and invasions of Lantana on Abu Hills.
Still, I strongly favor the scientific studies are demand of time on Abu Hills to conclude the reasons related to climate change.
Satya Prakash Mehra
--- On Mon, 2/8/10, Rashida Atthar <atthar....@gmail.com> wrote:
|Dear Sidhu ji,|
Eradication of Lantana is must and lot of work is going on in this direction throughout the Globe as it is among the world's ten most worst invasive species harming native flora.
But we have to keep several points in mind before eradicating it. On the basis of my studies on birds on Abu Hills, I found that many birds had adapted Lanatan bushes as there nesting/ roosting/ resting place. Before eradicating the bushes, we have to provide alternative or past habitat conditions to such fauna.
I will quote one example in this direction:
Every year Forest Department starts campaign to clean the area from Lantana on Abu Hills. When I was there, I found one endemic subtaxa of bird (Tawny-bellied Babbler Dumetia hyperythra abuensis) was habituated to live in the bushes at that site and could be easily seen. In the program of cleaning the sites, the bushes were burnt and area was made clear. Now, think what happened to the bird which is important for the birders to come and sight....... This was the sight which was accessible to every persons. We use to take youngsters to sight this species but now we have to go somewhat deep inside the forest treks to sight the species.
Similalry, Grey Jungle Fowl has made this plant species a very good hiding place. It is not possible for poachers to access inside these bushes easily. If the areas are cleared rampantly what will happen to the species hide.....
One of the Globally Threatened bird species is well adapted to Lanatana bushes.
Our suggestion is to plant or provide space for the native bushes to come up before cleaning or opening the surface from Lanatana bushes so that many faunal species which adapted to find their place in these bushes could not be harmed.
Satya Prakash Mehra
Rajputana Society of Natural History (RSNH)
--- On Mon, 2/8/10, Sid <sid...@gmail.com> wrote:
|Dear Dr Pankaj ji,|
You are right, I had just given information to state the changes in conditions of Abu Hills. So please don't relate it with either climate change or lantana.
Satya Prakash Mehra
--- On Mon, 2/8/10, Pankaj Kumar <sahani...@gmail.com> wrote: