Dear Dr. Koch,

many thanks for your detailed response to the reviewers' comments. As you can see, both reviewers were very critical and suggested important changes that, hopefully, will make your manuscript more robust. May I encourage you therefore to submit your revision now, which I may have to send out for a further round of review.

Best regards,

Tom Battin

Dear Dr. Coch,

we have now received one review from a second round. Please, note that this reviewer saw your manuscript also in the first round. That expert concludes that your revised manuscript has greatly improved, while at the same time, she/he suggests further points to better highlight the novelties of your work.

May I therefore suggest you to revise your manuscript accordingly and re-submit it as soon as possible so that I can make a recommendation.

My very best regards,

Tom Battin

Dear Dr. Coch,

apologize for my late response due to a ridiculous spam filter. Having now read your responses to the last review round, I am delighted to recommend your manuscript fro publication in Biogeosciences. You work is a great contribution to the the field of DOM biogeochemistry in streams and shed light on a system that has received little attention.

My very best regards,

Tom Battin