Pingie: HTTP:: 039 Organic 039 Lakes Cannot Sustain Large Fish Populations

HTTP:: 039 Organic 039 Lakes Cannot Sustain Large Fish Populations
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A new comparative research has revealed the fact that the main factor creating differences between fish production levels in clear mountain lakes and brown forest lakes is light, and not access to nutrients, such as previously held. The counter-intuitive discovery was made by experts at the Climate Impacts Research Center (CIRC), led by Associate Professor Jan Karlsson, AlphaGalileo reports. “In the brownest lakes sunlight can’t penetrate more than about two meters. In clear mountain lakes, the light can reach down to depths of 15-20 meters and lead to high production of algae on lake bottoms,” Karlsson explains the difference. One of the main reasons why low-lying lakes turn brown is the fact that organic materials constantly keep being washed into them. As they accumulate, they start preventing light from penetrating at a significant depth, adversely affecting the entire local ecosystem. Among the most severely affected classes of organisms are the algae, which ar!
e heavily dependent on sunlight for triggering photosynthesis. Without this fundamental process, they cannot survive, and fuel the food chain that eventually reaches a complexity that allows it to sustain large fish populations. The bottom-dwelling animals that feed on algae are a favored meal for fish, but, if ...
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http://news.softpedia.com/news/039-Organic-039-Lakes-Cannot-Sustain-Large-Fish-Populations-117471.shtml

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