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 Post subject: Alien Biota
Unread postPosted: Sun Jul 10, 2005 5:16 pm 
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Location: Boksburg, RSA.
:cry: Hi to all, are you guys aware that there are currently
367 alien invader plant species in the park? Two of the worst one's are Lantana camara which covers some 30,000 ha, and
Opuntia stricta (sour prickly pear) covers about 35,000 ha
in the Skukuza region. Alien invaders rate as the single biggest
threat to the biodiversity of the park, quite scary! I believe that all nature lovers need to become aware of the invaders, not only in the park, but at home as well, and to educate family and friends to control them.


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Unread postPosted: Sun Jul 10, 2005 5:20 pm 
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That is scary :!:
I've read the posters in the park but never realized they covered such a huge area.


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 Post subject: Alien plant invasions
Unread postPosted: Fri Jan 13, 2006 2:15 pm 
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From KPT Vol 2 Issue 19

Quote:
The Kruger National Park's programme manager for invasion ecology, Llewellyn Foxcroft, recently journeyed to Poland to take part in an international conference on the ecology and management of alien plant invasions.

Currently writing up his presentation on Kruger's experiences for the conference proceedings book, Foxcroft says that the international delegates from 31 countries were positive about South Africa's Working for Water programme.

"It is regarded widely as a model approach." At the conference Foxcroft presented Kruger's challenges and lessons learnt in dealing with the problem of invasive plants, and how the park's adaptive management strategy copes with the ongoing problem.
One challenge facing the park is the integration of the Working for Water (WfW) programme with the park's own alien plant task force, headed up by Vusi ngomezulu.

Foxcroft says that as WfW is so large, its planning is done up to a year in advance.
This poses a problem when an alien springs up suddenly in the park, as was the case with the water weed Azolla. This appeared in Kruger's rivers in a matter of months, and is now being controlled by a biological pest.

Foxcroft explains, “It is difficult to work a new weed into the programme," but adds that once WfW has educated all the teams and their leaders about new aliens, the programme puts a plan into action to combat it.

The park now has a two-pronged approach, in that its small task force will deal with any new pests that crop up in a localised area, calling in WfW if the infestation gets out of hand.
Kruger's team does not only deal with aliens inside the park's boundaries, but searches out and deals with aliens that grow outside the park in places like Hazyview. These can readily spread into Kruger.

New research is also underway in Kruger to look into the exact impacts that alien plants can have on other organisms, such as beetles and spiders. A masters student will be looking at the differences between invaded and non-invaded areas.

This will lead in to Kruger's environmental monitoring, by finding out precisely which indicators are most sensitive to alien invasions. Although Foxcroft would like to see more awareness of the alien plant issue and a growing recognition of problem species, he believes that the continued awareness programme is finally bringing the problem to public prominence.

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 Post subject:
Unread postPosted: Fri Jan 13, 2006 2:31 pm 
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Interesting article, but it raises a question for me. One with which I have been walking around for ages and keep forgetting to post.

Why is it called the Working for Water programme?

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 Post subject:
Unread postPosted: Fri Jan 13, 2006 3:18 pm 
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DuQues wrote:
Why is it called the Working for Water programme?


As the name implies, the Working for Water Programme helps to reverse what will otherwise be a devastating trend in terms of water security - not only the obvious aspect of water supply, but water quality issues and associated problems such as turbidity, thermal problems, erosion, siltation of dams and flooding.
Alien species wreak havoc on our world, chomping our natural resources and destroying our biodiversity. To chop down and clear invading alien species, including Wattle, Gums, Pines, Hakea, Triffid Weed - the list goes on.
Many of these invasive species consume vast quantities of water, thus depleting our precious supplies.
They also fuel devastating fires, which can destroy our indigenous species, and cause millions of rands in damage.

Invasive alien plants also have a severe impact in terms of other concerns, including biological diversity and the ecological integrity of natural systems, fire management, the productive use of land, and ultimately the conservation of our life-support systems.

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 Post subject:
Unread postPosted: Fri Jan 13, 2006 3:38 pm 
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Ah! Never thought in that direction. Thanks for clearing that up!

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 Post subject:
Unread postPosted: Fri Jan 13, 2006 3:52 pm 
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Excellent site on the subject.


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 Post subject:
Unread postPosted: Fri Jan 13, 2006 4:23 pm 
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Jakkalsbessie wrote:
Invasive alien plants also have a severe impact in terms of other concerns, including biological diversity and the ecological integrity of natural systems, fire management, the productive use of land, and ultimately the conservation of our life-support systems.


Got me thinking.
Are you saffies allowed to plant just anything in your garden :?:

In our country we have some fine examples of gardenplants which spread through the county and some are even dangerous for your health. And they are here to stay :twisted:

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 Post subject:
Unread postPosted: Fri Jan 13, 2006 4:26 pm 
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Location: Red sand, why do I keep thinking of red sand?
Look at the check-in at JBH Airport Bert. There are huge bins there where you are supposed to dump your seedlings, bulbs, cuttings etc.

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Unread postPosted: Fri Jan 13, 2006 4:29 pm 
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DuQues wrote:
Look at the check-in at JBH Airport Bert. There are huge bins there where you are supposed to dump your seedlings, bulbs, cuttings etc.


I know. But i read in the article that scientists even go to Hazyview for eg. Imo if you have alien gardenplants and they
seed easily it will be a difficult and long battle to keep the countyside and wildlifeparks pristine

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 Post subject:
Unread postPosted: Sat Jan 14, 2006 10:33 pm 
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We were allowed to plant any plants in our gardens. This became problematic because of the rapid spread of alien plants. Recently a new system has been implemented by government restricting the planting and keeping of certain plants. It works in a three tiered approach:

Category 1 plants: Plants which is totally banned. They may not be planted and must be destroyd where they occur. E.g. Lantana camara, Cats Claw Creeper.

Category 2 plants: Plants that may be planted for commercial reasons in demarcated and controlled areas only. May not be planted in other areas and must be destroyd where they so occur. E.g. Green wattle, some pine tree species

Category 3 plants: Plants that may not be planted and propagated further. They may be kept where they already occur, except if they occur in sensitive area such as near streams etc. E.g. Jacaranda, Morning glory
:wink:

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 Post subject:
Unread postPosted: Mon Jan 16, 2006 11:33 am 
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Yup , we are not allowed to plant just anything , also the nurserys are not supposed to sell the plants in these cattegories , although I have still seen certain classed invaders for sale :evil:

I have heard that you are not supposed to be able to get a transfer in the case of selling your property if you have class 1 invaders on it , and they have to be removed .
Who on earth would ever check this I dont know , but still the idea is good if it could get implemented.

After all large amounts of the alien species came from home gardens or where originally brought for the nursery trade.


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 Post subject:
Unread postPosted: Tue Feb 21, 2006 2:02 am 
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Hi,

I find it interesting to hear about the trouble Australian natives such as wattles and eucayltps are causing over in South Africa, as many of our major weed problems such as african boxthorn and bridal creeper came to Australia on ships that stopped over there on the way.

Its not original but truely a weed is a plant out of place.


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