yes
every eco system is different
also seasons make a difference

year to year changes occur

people who follow these can tell us more
who have  carefully plotted laboriously compiled data sets

australians keep tabs on weeds
look them up

usha di




On Thu, May 7, 2015 at 12:35 AM, Anurag Sharma <[email protected]>
wrote:

> But must not be too bad for water bodies ma'am.
> I saw it in three different lakes in two districts and in both places, it
> occupied a specific part of the lake, near the edges and only in small
> numbers.
>



-- 
Usha di
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