Please cite your sources!! Cand rarant)Wis square. You repeat this in 5 addition
ID: 279256 • Letter: P
Question
Please cite your sources!!
Cand rarant)Wis square. You repeat this in 5 additional areas along the stream channel. Using the terms abundant and rare describe what you would learn by examining the additional 5 samples. Given the following rank abundance chart (one will be shown for the actual assessment), which population has the highest species richness? How do you know? Which has the highest species evenness? How do you know? Which community is more diverse? How do you know? You are surveying stream invertebrates in a stream with moderately low human disturbance. You collect and count all the organisms you find in a 1m x 1m 1.0000 ? Midwest Streams Southern Streams New England Streams ? 0.1000 809 5 0.0100 ??@ges?00? 0.0010 0.0001 30 40 10 20 abundance rankExplanation / Answer
Species diversity of an ecological unit can be measured via two parameters i.e. species richness and evenness. Species richness means the total number of species (number of different species), while species evenness means the relative abundances of the different species). Evenness means abundance i.e. whether the species is present on regular basis, its distribution is smooth or homogeneous. A rank abundance curve or Whittaker plot is used to display relative species abundance. This curve is used to study species richness and species evenness. Species richness can be viewed as the number of different species on the chart i.e. number of species that are ranked. Species evenness is reflected in the slope of the line. A steep gradient indicates low evenness. The high-ranked species show high abundance than low-ranked species. A shallow gradient indicates high evenness as the abundances of different species are similar.
In the present figure, all the three areas i.e. Midwest streams, Southern streams and New England streams show almost similar species richness and evenness. This is because they show similar abundance all through the curve. There is no significant change in the diversity in all the three areas. Among the three, Midwest streams depict the highest species richness and evenness. this is because in this area species are well-represented and hence would be considered more diverse.
Refer to – Chapter 5, Analysis of Diversity www.vliz.be/imisdocs/publications/221019.pdf