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Thank you submitting the revised version of your manuscript. I am pleased to inform you your manuscript has been accepted for publication in PeerJ.
The reviewers comments are now in and they have made a few minor suggestions you may want to consider.
No comments. The paper adheres to the formal requirements.
No comments. The experimental design is sound.
No comments. Data are interesting and well elaborated.
Although the paper is written in quite good English, the Result section is a little little tricky, due to the long and confusing listing of results. Probably they could be usefully organized in tables.
This is a valuable contribution that substantially expands our knowledge of role of parasites in the course of an ongoing biological invasion.
My main criticism is associated with the use of some terms that, in my opinion, are not appropriate. "Mixed population" in the title of the article and throughout as well as "monospecific population" in several places of the text seem incorrect expressions. Population is by definition a group of individuals of one species, or at least individuals that interbreed (which does not seem to be the case with these brine shrimps). My suggestion is to check carefully the text and use "syntopic" or "coexisting" instead of "mixed". In the case of "monospecific", this is "a population existing without co-occurrence of other congeneric species".
In addition, some further suggestions, mostly of editorial characters, are presented in the fourth part of this report.
1. Line 28: Remove parentheses from “(Kellogg, 1906)”. This species was originally described as a member of the genus Artemia and therefore, according to the International Code of Zoological Nomenclature, the name of its author and the year of publication should not be in parentheses.
2. Line 34: Replace “Leach, 1819” with “Linnaeus, 1758” (but retain the parentheses because this species was originally described as a member of another genus.
3. Lines 34-35: Remove parentheses from “(Bowen & Sterling, 1978)”.
4. Line 74 and throughout: I would avoid using the word “endemic” because it has different meaning in epidemiology and in biogeography. Since both epidemiological and biogeographical aspects are relevant in the present paper, I would recommend to use “native” instead “endemic”.
5. Line 109: Replace the semicolon with comma.
6. Line 124 and throughout: Perhaps “unpublished” should be replaced with “in preparation” or “submitted”.
7. Line 139: Replace “mixed” with “syntopic”. Replace “populations” with “population”.
8. Line 163: Replace “a syntopic population“ with “syntopic populations”.
9. Line 275: Replace “specie” with “species”.
10. Line 284: Delete “monopecific”.
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