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 Post subject: Green dams / rivers
Unread postPosted: Wed May 14, 2008 11:18 am 
I noticed when I was in Kruger last week, that many of the dams and some rivers have turned green with algae. This was particularly evident in the Central areas. It is disturbing to see green crocodiles and hippos.

What is causing this and what is being done about it. I have reda about the draining of the dam nead Tshokwane but it does not stop there.

How is this efecting the animal, fish and bird life because it must surely be causing fish to die and birds to move to other areas.


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Unread postPosted: Wed May 14, 2008 5:25 pm 
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Read this article on the main page, it explains the situation.


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Unread postPosted: Wed May 14, 2008 5:31 pm 
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gerharddb wrote:
maby <...> KNP spokesman can help here <...>


In fact, he already has... :wink: For more info see the following news releases:

KNP Breaches Dam to Prevent Poison Spreading, August 2007
Science Tackles Algal Bloom Problem, April 2008

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 Post subject:
Unread postPosted: Thu May 15, 2008 9:40 am 
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Muhammad wrote:
and this is the reason

Image

(From the Silolweni Dam topic)

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Unread postPosted: Thu May 15, 2008 7:47 pm 
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This is becomming a problem worldwide. Even in the UK, there is a ford near where I live that we are regular advised not to enter during the summer due to poisonous algae.

I also remember almost walking into a lake near Welkom because the algae was so dense, it looked solid.

Warmer temperatures, water polution etc etc.

Richard


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 Post subject:
Unread postPosted: Thu May 15, 2008 9:44 pm 
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An interesting point of debate: breaching the dam and influencing animal grazing patterns is really a type of farming. How do the Park's manamement determine what is natural , and must be left to remedy itself, versus what is man-induced and needs to be re-balanced by human inter-action.


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 Post subject: Sunset Dam Green
Unread postPosted: Wed Jun 11, 2008 10:03 am 
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Thought you would like to see these pictures we have taken of Sunset Dam, my favourite place in Kruger. This green algae is bad as you can see by the pictures. Can anyone official tell us what are the plans? Will Sunset Dam need to be drained?

Image

Image

Image

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 Post subject:
Unread postPosted: Wed Jun 11, 2008 11:22 am 
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Worryingly this is not water lettuce but very poisonous algae. Other dams that have got like this have killed animals coming to drink there.

We watched a spoonbill wading through and just leaving a slimy trail through it. It is very worrying.

I'm with Jock, it would be interesting to know what the ranger intends to do to prevent the animal deaths that have been seen at other dams.

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 Post subject:
Unread postPosted: Wed Jun 11, 2008 12:54 pm 
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Those pitures are of great concern Jock! I think everyone loves Sunset dam and to have to drain it would be very very sad :cry:

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 Post subject:
Unread postPosted: Wed Jun 11, 2008 1:14 pm 
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I read recently (?latest Kruger Times) that they plan to pump water in to dilute the algae and then will monitor the situation. They do not want to drain it because of the tourist value/interest - but obviously will do so if it becomes necessary.

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 Post subject:
Unread postPosted: Wed Jun 11, 2008 9:31 pm 
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This is not good news at all, sunset dam is definately one of my favourite places with almost always something to see. But i would rather it be drained than kill animals. Thanks for the up date Ecojunkie. I dont think that diluting it will help though as far as i know , as the algae can grow very , very rapidly if conditions are suitable so would it not just 'pollute' the added water as well?

Is there not some form of biological control that could be used ?

:( :(

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 Post subject:
Unread postPosted: Thu Jun 12, 2008 7:03 am 
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I read on the forum about Silolweni dam and it was said that its caused by the number of hippo's in the dam (I think), so if that is the case cant they just relocate some of the hippos to ease the problem or help sort it out.

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 Post subject:
Unread postPosted: Thu Jun 12, 2008 9:18 am 
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This one you mean?

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 Post subject:
Unread postPosted: Sat Jun 14, 2008 5:17 pm 
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Hippo feces in the water is the root cause of the blue green algae taking a hold in a dam, and if there are to many hippos, then you have a bigger problem and build up.
Sunset dam luckily has a constant flow of water being pumped into the dam, so it does have a certain amount of water getting flushed through it, unlike some of the other big earthen dams that are a 1 way stop for the water.
Luckily in dams that have a flow of water moving through themb the algae tends to not build up to levels that are dangerous enough to kill animals.
One must also remember that this algae is naturally present in most of the water in the park, it is just the levels of concentration that cause a problem.
It is also not all algae that are poisonous, so if you see a bit of algae it may be a harmless type.

Sunset dam being near the Sabie river helps a lot as there is a ready supply of fresh water available to pump into the dam to dilute and flush the algae.

The problem in dams will be worse in winter because of two reasons, there is less rain water flushing the dam, and more hippo tend to hang about in the dam as seasonal pools they may inhabit in summer will dry up so they seek out new "homes" for the winter.

To move the hippos away will not help as they will just return to the dam, or other hippos will soon take up residence in there if the territorial group is missing for a while.

I am sure sunset dam will be fine though
:D


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 Post subject:
Unread postPosted: Thu Jun 26, 2008 10:03 am 
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wildtuinman wrote:
I think Kruger will soon have to include hippo on their culling list.


Oh dear....the Hippos are Naughty....but no cullings :naughty:


Last edited by Oumie on Thu Jun 26, 2008 10:06 am, edited 1 time in total.

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