{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,15]],"date-time":"2026-07-15T19:57:31Z","timestamp":1784145451174,"version":"3.55.0"},"reference-count":70,"publisher":"Frontiers Media SA","license":[{"start":{"date-parts":[[2021,11,12]],"date-time":"2021-11-12T00:00:00Z","timestamp":1636675200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/100000139","name":"U.S. Environmental Protection Agency","doi-asserted-by":"publisher","id":[{"id":"10.13039\/100000139","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100000203","name":"U.S. Geological Survey","doi-asserted-by":"publisher","id":[{"id":"10.13039\/100000203","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["frontiersin.org"],"crossmark-restriction":true},"short-container-title":["Front. For. Glob. Change"],"abstract":"<jats:p>Tropical mangrove forests have been described as \u201ccoastal kidneys,\u201d promoting sediment deposition and filtering contaminants, including excess nutrients. Coastal areas throughout the world are experiencing increased human activities, resulting in altered geomorphology, hydrology, and nutrient inputs. To effectively manage and sustain coastal mangroves, it is important to understand nitrogen (N) storage and accumulation in systems where human activities are causing rapid changes in N inputs and cycling. We examined N storage and accumulation rates in recent (1970 \u2013 2016) and historic (1930 \u2013 1970) decades in the context of urbanization in the San Juan Bay Estuary (SJBE, Puerto Rico), using mangrove soil cores that were radiometrically dated. Local anthropogenic stressors can alter N storage rates in peri-urban mangrove systems either directly by increasing N soil fertility or indirectly by altering hydrology (e.g., dredging, filling, and canalization). Nitrogen accumulation rates were greater in recent decades than historic decades at Pi\u00f1ones Forest and Martin Pe\u00f1a East. Martin Pe\u00f1a East was characterized by high urbanization, and Pi\u00f1ones, by the least urbanization in the SJBE. The mangrove forest at Martin Pe\u00f1a East fringed a poorly drained canal and often received raw sewage inputs, with N accumulation rates ranging from 17.7 to 37.9 g m<jats:sup>\u20132<\/jats:sup> y<jats:sup>\u20131<\/jats:sup> in recent decades. The Pi\u00f1ones Forest was isolated and had low flushing, possibly exacerbated by river damming, with N accumulation rates ranging from 18.6 to 24.2 g m<jats:sup>\u20132<\/jats:sup> y<jats:sup>\u20131<\/jats:sup> in recent decades. Nearly all (96.3%) of the estuary-wide mangrove N (9.4 Mg ha<jats:sup>\u20131<\/jats:sup>) was stored in the soils with 7.1 Mg ha<jats:sup>\u20131<\/jats:sup> sequestered during 1970\u20132017 (0\u201318 cm) and 2.3 Mg ha<jats:sup>\u20131<\/jats:sup> during 1930\u20131970 (19\u201328 cm). Estuary-wide mangrove soil N accumulation rates were over twice as great in recent decades (0.18 \u00b1 0.002 Mg ha<jats:sup>\u20131<\/jats:sup>y<jats:sup>\u20131<\/jats:sup>) than historically (0.08 \u00b1 0.001 Mg ha<jats:sup>\u20131<\/jats:sup>y<jats:sup>\u20131<\/jats:sup>). Nitrogen accumulation rates in SJBE mangrove soils in recent times were twofold larger than the rate of human-consumed food N that is exported as wastewater (0.08 Mg ha<jats:sup>\u20131<\/jats:sup> y<jats:sup>\u20131<\/jats:sup>), suggesting the potential for mangroves to sequester human-derived N. Conservation and effective management of mangrove forests and their surrounding watersheds in the Anthropocene are important for maintaining water quality in coastal communities throughout tropical regions.<\/jats:p>","DOI":"10.3389\/ffgc.2021.765896","type":"journal-article","created":{"date-parts":[[2021,11,12]],"date-time":"2021-11-12T06:18:25Z","timestamp":1636697905000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":3,"title":["Recent Nitrogen Storage and Accumulation Rates in Mangrove Soils Exceed Historic Rates in the Urbanized San Juan Bay Estuary (Puerto Rico, United States)"],"prefix":"10.3389","volume":"4","author":[{"given":"Cathleen","family":"Wigand","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Autumn J.","family":"Oczkowski","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Benjamin L.","family":"Branoff","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Meagan","family":"Eagle","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Alana","family":"Hanson","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rose M.","family":"Martin","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Stephen","family":"Balogh","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kenneth M.","family":"Miller","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Evelyn","family":"Huertas","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Joseph","family":"Loffredo","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Elizabeth B.","family":"Watson","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1965","published-online":{"date-parts":[[2021,11,12]]},"reference":[{"key":"B1","doi-asserted-by":"publisher","first-page":"123","DOI":"10.1357\/0022240963213475","article-title":"The dynamics of benthic nutrient pools and fluxes in tropical mangrove forests.","volume":"54","author":"Alongi","year":"1996","journal-title":"J. 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