<h2><span class="mw-headline">External links</span></h2>

<ul>

<li><a class="external text" title="http://www.barrameda.com.ar/ecology" rel="nofollow" href="http://www.barrameda.com.ar/ecology"><font color="#0066cc">What is Ecology?</font></a> </li>

<li><a class="external text" title="http://www.econguru.com/fundamentals_of_ecology/" rel="nofollow" href="http://www.econguru.com/fundamentals_of_ecology/"><font color="#0066cc">Fundamentals of Ecology</font></a> Textbook-style investigation to the economy of nature, breaks down in 4 chapters from Population to Ecosystem. </li>