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Article: The Anthropogenic Nitrogen Footprint of a Tropical Lagoon: Spatial Variability in Padina sp. δ15N Values

TitleThe Anthropogenic Nitrogen Footprint of a Tropical Lagoon: Spatial Variability in Padina sp. δ15N Values
Authors
KeywordsN stable isotopes
Algal bioassays
Tropical lagoon
Padina sp
Issue Date2020
PublisherUniversity of Hawaii Press. The Journal's web site is located at http://www.uhpress.hawaii.edu/t-pacific-science.aspx
Citation
Pacific Science, 2020, v. 74 n. 1, p. 19-29 How to Cite?
AbstractLarge quantities of anthropogenic nitrogen (N) in the marine environment are detrimental for coastal ecosystems and understanding the magnitude and distribution of this N opens paths to remediation. One area of concern is Cocos Lagoon, in the south of Guam, Northern Mariana Islands, which hosts a diversity of corals including Acropora species listed in the Endangered Species Act. Degradation of Guam's coral reefs may be influenced by untreated sewage effluent. To gain insight into the spatial extent of human N pollution, we deployed 50 macroalgal thalli (Padina sp.) as bio-indicators in a grid pattern over the entire lagoon for one week and then measured the stable N isotopes of bio-available N (δ15N). We observed relatively low δ15N values (∼1–2‰) in the shallow areas in the east suggesting coastal currents bringing in fixed N from the open ocean or local N2 fixation. The comparatively high δ15N values (∼6‰) in the deeper channel of the lagoon suggest sewage as a major source of N. The distribution of δ15N values was not determined by the distance to N sources, such as river outlets or the tourist resort on Cocos Island but by the bathymetry, which affects the residence time and influx of oceanic water.
Persistent Identifierhttp://hdl.handle.net/10722/287985
ISSN
2020 Impact Factor: 1.101
2020 SCImago Journal Rankings: 0.429
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorGeeraert, N-
dc.contributor.authorDuprey, NN-
dc.contributor.authorMcIlroy, SE-
dc.contributor.authorThompson, PD-
dc.contributor.authorGoldstein, BR-
dc.contributor.authorLaRoche, C-
dc.contributor.authorKim, K-
dc.contributor.authorRaymundo, LJ-
dc.contributor.authorBaker, DM-
dc.date.accessioned2020-10-05T12:06:09Z-
dc.date.available2020-10-05T12:06:09Z-
dc.date.issued2020-
dc.identifier.citationPacific Science, 2020, v. 74 n. 1, p. 19-29-
dc.identifier.issn0030-8870-
dc.identifier.urihttp://hdl.handle.net/10722/287985-
dc.description.abstractLarge quantities of anthropogenic nitrogen (N) in the marine environment are detrimental for coastal ecosystems and understanding the magnitude and distribution of this N opens paths to remediation. One area of concern is Cocos Lagoon, in the south of Guam, Northern Mariana Islands, which hosts a diversity of corals including Acropora species listed in the Endangered Species Act. Degradation of Guam's coral reefs may be influenced by untreated sewage effluent. To gain insight into the spatial extent of human N pollution, we deployed 50 macroalgal thalli (Padina sp.) as bio-indicators in a grid pattern over the entire lagoon for one week and then measured the stable N isotopes of bio-available N (δ15N). We observed relatively low δ15N values (∼1–2‰) in the shallow areas in the east suggesting coastal currents bringing in fixed N from the open ocean or local N2 fixation. The comparatively high δ15N values (∼6‰) in the deeper channel of the lagoon suggest sewage as a major source of N. The distribution of δ15N values was not determined by the distance to N sources, such as river outlets or the tourist resort on Cocos Island but by the bathymetry, which affects the residence time and influx of oceanic water.-
dc.languageeng-
dc.publisherUniversity of Hawaii Press. The Journal's web site is located at http://www.uhpress.hawaii.edu/t-pacific-science.aspx-
dc.relation.ispartofPacific Science-
dc.subjectN stable isotopes-
dc.subjectAlgal bioassays-
dc.subjectTropical lagoon-
dc.subjectPadina sp-
dc.titleThe Anthropogenic Nitrogen Footprint of a Tropical Lagoon: Spatial Variability in Padina sp. δ15N Values-
dc.typeArticle-
dc.identifier.emailMcIlroy, SE: smcilroy@hku.hk-
dc.identifier.emailBaker, DM: dmbaker@hku.hk-
dc.identifier.authorityMcIlroy, SE=rp02729-
dc.identifier.authorityBaker, DM=rp01712-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.2984/74.1.2-
dc.identifier.scopuseid_2-s2.0-85083044073-
dc.identifier.hkuros315209-
dc.identifier.volume74-
dc.identifier.issue1-
dc.identifier.spage19-
dc.identifier.epage29-
dc.identifier.isiWOS:000522154900002-
dc.publisher.placeUnited States-
dc.identifier.issnl0030-8870-

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