In situ observations reveal continental-scale warming, oxygen decline, and eutrophication in U.S. estuaries

Q: What does this research mean for the field?

U.S. estuaries are experiencing widespread warming, eutrophication, and oxygen declines, with increasing temperatures and chlorophyll-a jointly driving the reduction in oxygen levels. Novelty: ClaimNovelty.INCREMENTAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

Kaitlin L. Reinl; Robert P. Dunn; Kimberly Cressman; Theophilos Collins; Jennifer L. DeBose; Carl T. Friedrichs; Jason S. Goldstein; Alicia Helms; Christopher Kinkade; Julie L. Krask; David B. Parrish; Hannah N. Nicklay; Justin T. Ridge; Denise M. Sanger; Jacob A. Cianci‐Gaskill; Nicole Dix; Thomas M. Grothues; Steven E. McMurray; Christopher Peter

doi:10.1038/s43247-026-03934-w

Key Points

To evaluate continental-scale decadal patterns in water temperature, algal biomass, and dissolved oxygen across coastal estuaries.
Analyzed two decades of high-resolution, in situ monitoring data collected across 29 estuaries in the United States.
Evaluated concurrent temporal trends in water temperature, chlorophyll-a concentrations, and dissolved oxygen levels.
Widespread warming, eutrophication, and dissolved oxygen declines occurred across the evaluated estuaries over the 20-year period.
Rising water temperatures and increased chlorophyll-a levels jointly contributed to widespread reductions in oxygen availability.

Implication

Long-term observational analysis reveals widespread warming and oxygen decline across 29 estuaries, highlighting compounding climate and nutrient stressors on coastal waters.

Abstract

U.S. estuaries show widespread warming, eutrophication, and oxygen declines, with increasing temperature and chlorophyll-a together contributing to declining oxygen levels, based on two decades of high resolution, in situ data from 29 estuaries.

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Cite This Study

Reinl et al. (2026) studied this question.

synapsesocial.com/papers/6aa27be758559d80afc7572c https://doi.org/10.1038/s43247-026-03934-w

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In situ observations reveal continental-scale warming, oxygen decline, and eutrophication in U.S. estuaries

Key Points

Implication

Abstract

Discussion

Cite This Study

In situ observations reveal continental-scale warming, oxygen decline, and eutrophication in U.S. estuaries

Key Points

Implication

Abstract

Discussion

Cite This Study

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