How to define the rare and abundant taxa from the ASV feature table?

General Discussion
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Hi, guys. I am a newcomer to Qiime2.
Recently, I am processing some 16s rRNA and ITS gene data. Exploring the difference in the biogeographic distrucution and community assembly of rare and abundant taxa is one of my main goals. But I always find the definition of rare and abundant taxa about OTU table, rare is known about the ASV. Considering the processing feature of DADA2, I would like to know whether it is feasible to divide the ASV into the rare and abundant sections and how to define these two sections.
Thank you in advance for any help.

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DADA2 only discards singletons by default, so doubletons etc can still be observed. So yes, I think it is still feasible, depending on how you define "rare".

That is really subjective and depends on the structure of the data. You could define an arbitrary threshold, or you could see what others have done in the literature for programmatic definitions of rarity — e.g., this paper comes to mind:
https://mbio.asm.org/content/5/4/e01371-14

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Thanks for your reply!
I will read this paper to find relevant information.
Many thanks