QUICK CONTACT

 

CATEGORIES

UGC Approved Journal

   .

IMPACT FACTOR CERTIFICATE

Dominance is more justified than abundance to calculate importance value index (IVI) of plant species

  • strict warning: Non-static method view::load() should not be called statically in /home4/vibu/public_html/journalajst.com/sites/all/modules/views/views.module on line 906.
  • strict warning: Declaration of views_handler_filter::options_validate() should be compatible with views_handler::options_validate($form, &$form_state) in /home4/vibu/public_html/journalajst.com/sites/all/modules/views/handlers/views_handler_filter.inc on line 607.
  • strict warning: Declaration of views_handler_filter::options_submit() should be compatible with views_handler::options_submit($form, &$form_state) in /home4/vibu/public_html/journalajst.com/sites/all/modules/views/handlers/views_handler_filter.inc on line 607.
  • strict warning: Declaration of views_handler_filter_boolean_operator::value_validate() should be compatible with views_handler_filter::value_validate($form, &$form_state) in /home4/vibu/public_html/journalajst.com/sites/all/modules/views/handlers/views_handler_filter_boolean_operator.inc on line 159.
  • strict warning: Declaration of views_plugin_row::options_validate() should be compatible with views_plugin::options_validate(&$form, &$form_state) in /home4/vibu/public_html/journalajst.com/sites/all/modules/views/plugins/views_plugin_row.inc on line 134.
  • strict warning: Declaration of views_plugin_row::options_submit() should be compatible with views_plugin::options_submit(&$form, &$form_state) in /home4/vibu/public_html/journalajst.com/sites/all/modules/views/plugins/views_plugin_row.inc on line 134.
  • strict warning: Non-static method view::load() should not be called statically in /home4/vibu/public_html/journalajst.com/sites/all/modules/views/views.module on line 906.
  • strict warning: Declaration of views_plugin_style_default::options() should be compatible with views_object::options() in /home4/vibu/public_html/journalajst.com/sites/all/modules/views/plugins/views_plugin_style_default.inc on line 24.
  • strict warning: Non-static method view::load() should not be called statically in /home4/vibu/public_html/journalajst.com/sites/all/modules/views/views.module on line 906.
  • strict warning: Non-static method view::load() should not be called statically in /home4/vibu/public_html/journalajst.com/sites/all/modules/views/views.module on line 906.
  • strict warning: Declaration of views_handler_argument::init() should be compatible with views_handler::init(&$view, $options) in /home4/vibu/public_html/journalajst.com/sites/all/modules/views/handlers/views_handler_argument.inc on line 744.
Author: 
Bhadra, A.K. and Pattanayak, S.K.
Abstract: 

Abundance and dominance are two aspects of the plant species diversity dynamics, often considered interchangeably together with frequency and density to estimate Importance Value Index (IVI). The weightage of the use of abundance or dominance for IVI has been explored through a study of abundance-dominance directed species dynamics on the Gandhamardan hill of western Odisha in the altitudinal range 340-960m. In total 232 plant species were documented. Large number of species have higher abundance guided IVI (A-IVI) compared to dominance guided IVI (D-IVI). Whole vegetation, Tree-1(>15cm GBH), Tree-2(<15cm GBH), Shrub, LTC (Lianas, Twinner, Climber), Herb/Grass and Seedling community, with 94%, 81%, 90%, 100%, 100%, 100% and 99% species, respectively, showing contiguous distribution justify this finding. There are a number of species common to the Abundance and Dominance based groups of top twenty five species in each community and this commonness follows the order ‘LTC>Shrub>Seedling>Tree-2>Tree-1>Herb/Grass>Whole vegetation. For A-IVI and D-IVI based groups of top twenty species, the order is ‘Shrub>LTC=Tree-2>Tree-1=Seedling>Herb/Grass>Whole vegetation’. In the two orders, ‘whole vegetation’ is placed at the end for which 8% and 45% species are common to abundance and dominance based groups, and A-IVI and D-IVI based groups, respectively. In this community, nine species are observed to be common amongst top twenty species for A-IVI and D-IVI groups, out of which five are tree species; top twenty species in A-IVI and D-IVI based groups consists of six and sixteen tree species, respectively. Out of top twenty five plant species in whole plant community based on abundance, 19 are herbs/grasses (76%), while on dominance, 24 are trees (96%). These observations suggest that abundance and dominance have high discriminating ability when the whole vegetation is considered as a unit. Abundance is a factor in vegetation survey, which reveals, promotes and prioritizes communities other than trees. Dominance is justified for tree community as the individuals of tree species are available in higher girths. The values of Shannon-Wiener, Simpson’s diversity indices and Evenness indices are higher in case of A-IVI compared to D-IVI. However, the Spearman’s rank correlation (ρ) values of D-IVI to dominance are higher than those of A-IVI to abundance in case of all communities studied. Therefore, the estimation of importance value index (IVI) of plant species should be carried out preferably based on dominance than abundance.

EDITOR-IN-CHIEF

        

            Prof. Dr. ISMAIL YILDIRIM

CURRENT ISSUE

 

COPYRIGHT AGREEMENT