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field_methods:species_richness_-_modified_whitaker_approach [2008/12/24 16:12]
kcolson
field_methods:species_richness_-_modified_whitaker_approach [2013/02/05 12:49]
gtucker
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-====== Plant Species Richness ​- Modified Whittaker Approach ​====== +<​sup>​[[:​bug_reporting|Report a bug, broken link, or incorrect content]]</​sup>​[[http://​methods.landscapetoolbox.org|{{ field_methods:​methodsguide3.png?​220x120|}}]] 
- ​[[http://​www.rangelandmethods.org/​about/​get_involved|{{:​abstract_in_dev.gif|}}]]+====== Plant Species Richness ====== 
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 + ​[[http://​www.landscapetoolbox.org/​about/​get_involved|{{:​abstract_in_dev.gif|}}]]\\ 
 +contributed by Jason Karl and Karen Colson
  
 ===== Description and Uses ===== ===== Description and Uses =====
  
-Plant species richness is defined as the total number of species in an area and is one indicator of biodiversity. ​The Modified Whittaker approach discussed here is based on Stohlgren et al. (1995) and Bull et al.(1998), which can be found in Herrick et al. 2005. This method is very time intensive.+Plant species richness is defined as the total number of species in an area and is one indicator of biodiversity. ​There are several different methods for determining or estimating plant species richness
  
 +The Modified Whittaker approach is based on Stohlgren et al. (1995) and Bull et al.(1998), which can be found in Herrick et al. 2005. This method is very time intensive. The Modified Whittaker approach calls for three 10m by 30m plots set up in a spoke design (figure 1). Within each of these plots, a 2m b 5m subplot and four 0.5m by 2m subplots are established. Starting with the smallest subplots, the subplots and plots are searched and the species found recorded. Richness is calculated based on the assumption that there is a linear relationship between the number of species and the log of the area searched. See Herrick et al. (2005) for detailed instructions on how to implement the Modified Whittaker approach and make richness estimates from the collected data.
 +
 +{{:​field_methods:​whittaker_richness_design.jpg|}}
 +
 +**Figure 1. Design of the Modified Whittaker richness method((Reproduced from Herrick et al. (2005) with permission))**
 +
 +
 +An alternative,​ rapid approach to estimating species richness is to use the observations made along line-point intercept transects. Species richness is estimated as the number of species encountered over all of the point intercepts made in a given area (i.e., across all transects). This method is much quicker than the Modified Whittaker approach, but will tend only to capture the most common species in the area. 
  
 ===== Advantages and Limitations ===== ===== Advantages and Limitations =====
  
-This method is time consuming and has high sampling costs associated with it.  To save time and cost it is sample fewer transects (one can be sufficient) at more locations. ​+The Modified Whittaker ​method is time consuming and has high sampling costs associated with it.  To save time and cost it is possible to sample fewer transects (one can be sufficient) at more locations. ​
  
 ===== Manuals ===== ===== Manuals =====
  
-    *Monitoring Manual for Grasslands, Shrublands, and Savanna Ecosystems (Herrick et al. 2005)  +    * Monitoring Manual for Grasslands, Shrublands, and Savanna Ecosystems (Herrick et al. 2009[[http://​jornada.nmsu.edu/​sites/​jornada.nmsu.edu/​files/​Volume_II.pdf]] 
-http://usda-ars.nmsu.edu/Monit_Assess/monitoring_main.php+    * Data forms for the Modified Whittaker method are available at: [[http://jornada.nmsu.edu/sites/jornada.nmsu.edu/​files/​species_richness_dataform.pdf]]
  
 ===== Technical and Application References ===== ===== Technical and Application References =====
  
-  *Bull, K., K. W. Stolte, and T. J. Stohlgren. 1998. Forest Health Monitoring: Vegetation Pilot Field Methods +  * Bull, K., K. W. Stolte, and T. J. Stohlgren. 1998. Forest Health Monitoring: Vegetation Pilot Field Methods Guide. U.S. Department of Agriculture,​ Forest Service. Washington, D.C. 
-Guide. U.S. Department of Agriculture,​ Forest Service. Washington, D.C. +  * Stohlgren, T.J., M. B. Falkner, and L. D. Schell. 1995. A Modified-Whittaker nested vegetation sampling method. Plant Ecology. ​ Volume 117, Number 2 / April, 1995. Pages 113-121. 
- +  * Shmida A. 1984. Whittaker'​s plant diversity sampling method. Israel Journal of Botany 33: 41–46.
-  *Stohlgren, T.J., M. B. Falkner, and L. D. Schell. 1995. A Modified-Whittaker nested vegetation sampling method. Plant Ecology. ​ Volume 117, Number 2 / April, 1995. Pages 113-121. ​ +
-  ​ +
-  *Shmida A. 1984. Whittaker'​s plant diversity sampling method. Israel Journal of Botany 33: 41–46.+
  
 ===== Similar Approaches ===== ===== Similar Approaches =====
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 ===== Additional Information ===== ===== Additional Information =====
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 +{{tag> richness diversity field monitoring assessment count}}
 +
 +===== Discussion/​Comments =====
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 +~~DISCUSSION| ~~
  
field_methods/species_richness_-_modified_whitaker_approach.txt · Last modified: 2013/02/05 12:49 by gtucker