Human Impact without Humans

http://homepage.mac.com/patholleran/ParkVision/CraterLake/cl-091.jpg

Actually, humans were involved but from a distance – not directly. Humans were responsible as a result of industrialization.

The clear signs of industrialisation can be found even in very remote lakes, thousands of kilometres from the nearest city. The research is based on studies of sediment from 36 lakes in the USA, Canada, Greenland and Svalbard, Norway. The researchers have analysed how the chemical composition of the sediment has changed over the centuries.

The cause is nitrogen.

Nitrogen is an important nutrient for plants, but overuse in more intensive farming can lead to pollution.

It appears that remote areas of our planet are not entirely remote.

Remote Wilderness Polluted by Humans

 

Posted in Water | Tagged , , | Leave a comment

Lake Victoria: Sick and Sinking

http://cultureodyssey.com/uploads/inspirations/image/389/cache_insp389_1.png

“Lake Victoria, shared by Kenya, Tanzania and Uganda, was named after the Queen of England and is the world’s largest tropical lake and the second largest freshwater lake. Covering a total of 69,000 square kilometres, the lake is as large as Ireland, and lies in the Rift Valley of East Africa.”

The water level of Africa’s giant has begun to noticeably sink from the early 1990′s when hanging climate began to change/reduce rainfall patterns. The Lake is also getting very sick. Why?

“The ecological health of Lake Victoria has been affected profoundly as a result of a rapidly growing population, clearance of natural vegetation along the shores, a booming fish-export industry, the disappearance of several fish species native to the lake, prolific growth of algae, and dumping of untreated effluent by several industries. Much of the damage is vast and irreversible. Traditional lifestyles of lakeshore communities have been disrupted and are crumbling.”

Even something as simple as the ferry system is being dramatically impacted.

“one ship which berths at Mwanza on a regular basis, the MV Victoria, has had its passenger doors repositioned because the old ones had become inaccessible.”

Both articles will provide all of the impact details from the introduction of new fish species, the displacement of traditional jobs, and the prolific damage from the dumping of untreated industrial waste.

With projections of rising atmospheric temperatures and interrupted rainfall patterns around the globe, increasing populations needing more water for farming and personal use, the proliferation of invasive species etc., etc., etc., Lake Victoria may become another Lake Chad, though, possibly and in spite of the negative factors, this could take a few generations to accomplish.

Lake Victoria’s Ports Grapple with Sinking Water Levels

Lake Victoria: a Sick Giant

 

Posted in Water | Tagged , , , , , , | Leave a comment

Managing Fish Reserves in US Waters

http://see-the-sea.org/topics/commerce/OVERFISHINGfromPEW.gif

 

Yes, there can be bipartisan support in Washington!

This is an issue which has successfully received “bipartisan” legislative approval. That statement is almost an oxymoron to those who follow anything in Congress. This law is an effort to regulate/manage fishing activities in US coastal waters.

You can bet there are some avid protesters to this one – as with most regulatory action. Perhaps some of the protestor concern is valid. It could be that the monitoring process is flawed, for example, the data used to determine quota limits and duration of permissible fishing periods. What is also important about this law is that the

“ban on overfishing forced fishery managers to impose limits that some commercial and recreational fishers had resisted for years.”

Yet, when you look around the world at the impact on ever increasing levels of seafood consumption combined with the use of improved, sophisticated fishing techniques, then the potential to restore fish stocks for the future doesn’t seem so bad. Someone always suffers and, in the short-term, it could be “commercial and recreational fishing for the next several decades.”

When considering how easy it is for a species to collapse from over catch, the reality must begin to set in that ” a precautionary approach [is not unreasonable] because the catch limits aim to achieve the “maximum sustainable yield” without pushing a species to collapse. “You’re fishing right on the edge.”

Show me a species that has returned from extinction?

U.S. Tightens Fishing Policy for 2012 Catch Limits
of All Managed Species

 

Posted in Water | Tagged , , , , , | Leave a comment