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Does DO decrease at the down reaches of the river? 


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No, the abstracts do not provide a clear answer to the question of whether dissolved oxygen (DO) decreases at the downstream reaches of the river.

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The provided paper does not mention anything about dissolved oxygen (DO) levels in the down reaches of the river. The paper focuses on quantifying river evaporation and recharge processes using stable isotopes.
The answer to the query is not provided in the paper. The paper discusses the modeling of macroinvertebrate and fish biotic indices in river networks, but it does not mention anything about dissolved oxygen (DO) levels or its variation along the river reaches.
The provided paper does not mention anything about dissolved oxygen (DO) levels or changes in DO at the down reaches of the river.
The provided paper does not mention anything about the decrease in dissolved oxygen (DO) at the downstream reaches of the river.

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