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field_methods:estimate_population_size [2009/09/21 16:16]
jasonkarl
field_methods:estimate_population_size [2012/03/08 15:34] (current)
jgillan
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 +<​sup>​[[:​bug_reporting|Report a bug, broken link, or incorrect content]]</​sup>​[[http://​methods.landscapetoolbox.org|{{ field_methods:​methodsguide3.png?​220x120|}}]]
 ====== Estimate of Population Size ====== ====== Estimate of Population Size ======
- ​[[http://​www.rangelandmethods.org/​about/​get_involved|{{:​abstract_in_dev.gif|}}]]+ ​[[http://​www.landscapetoolbox.org/​about/​get_involved|{{:​abstract_in_dev.gif|}}]]\\ 
 +written by Jason Karl
  
 ===== Method Type ===== ===== Method Type =====
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 ===== Advantages and Limitations ===== ===== Advantages and Limitations =====
  
 +The main advantage of this method is that it is a quick way to collect information on population abundance. The disadvantages to this method are:
 +  - it is highly subjective and repeatability is low
 +  - there can be a large amount of variation between observers
 +  - cryptic species or those difficult to see due to surrounding vegetation can cause significant underestimation.
  
 ===== Manuals/​Instructions ===== ===== Manuals/​Instructions =====
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 ===== Technical and Application References ===== ===== Technical and Application References =====
 +  * Muir, P. S. and R. K. Moseley. 1994. Responses of //Primula alcalina//, a threatened species of alkaline seeps, to site and grazing. Natural Areas Journal 14: 269-279.
  
 ===== Similar Approaches ===== ===== Similar Approaches =====
 +Quantitative estimates of population size can be obtained using frequency or density methods like [quadrat frequency], [nested frequency], or [density quadrats].
  
 ===== Additional Information ===== ===== Additional Information =====
  
 +===== Web Search Results =====
 +<​html>​
 +<script src="​http://​www.google.com/​jsapi"></​script>​
 +
 +    <script language="​Javascript"​ type="​text/​javascript">//<​![CDATA[
 +      google.load('​search',​ '​1.0'​);​
 +      ​
 +      function OnLoad() {
 +
 +        var searchString = '"​estimate population size monitoring"';​
 +        // create a tabbed mode search control
 +        var searchControl = new google.search.SearchControl();​
 +        options = new google.search.SearcherOptions();​
 +        options.setExpandMode(google.search.SearchControl.EXPAND_MODE_OPEN);​
 +        options.setRoot(document.getElementById("​web_results"​));​
 +        searchControl.addSearcher(new google.search.WebSearch(),​ options);
 +
 +        var drawOptions = new google.search.DrawOptions();​
 +
 +        options2 = new google.search.SearcherOptions();​
 +        options2.setExpandMode(google.search.SearchControl.EXPAND_MODE_OPEN);​
 +        searchControl.addSearcher(new google.search.BookSearch(),​ options2);
 +        searchControl.draw(document.getElementById("​book_results"​),​ drawOptions);​
 +
 +        // execute searches
 +        searchControl.execute(searchString);​
 +
 +      }
 +      google.setOnLoadCallback(OnLoad,​ true);
 +    //]]>
 +    </​script>​
 +
 +    <table border="​0">​
 +       <​tr><​td width="​50%">​ <div class="​search-control"​ id="​book_results">​Loading...</​div>​
 +           </​td>​
 +           <​td width="​50%">​ <div class="​search-control"​ id="​web_results">​Loading...</​div>​
 +           </​td>​
 +       </​tr>​
 +    </​table>​
 +</​html>​
 +
 +===== Discussion/​Comments =====
 +<​sub>​**You must have an account and be logged in to post or reply to the discussion topics below. [[http://​abstracts.rangelandmethods.org/​doku.php/​Home?​do=login&​sectok=db3676cff5bcd873b609b4e582432d73|Click here]] to login or register for the site.**</​sub>​
 +~~DISCUSSION| ~~
  
field_methods/estimate_population_size.1253571406.txt.gz · Last modified: 2012/02/22 13:28 (external edit)