Carbon and nutrient burial within Peruvian coastal marsh driven by anthropogenic activities

Alexander Pérez, Rosario Escobedo, Rodrigo Castro, Rosa Jesus, Jorge Cardich, Pedro E. Romero, Rodolfo Salas-Gismondi, Diana Ochoa, Héctor Aponte, Christian J. Sanders, Matthieu Carré

Research output: Contribution to journalArticlepeer-review

Abstract

This research assessed carbon and nutrient burial during the past ~60 years within a Peruvian coastal marsh ecosystem affected by anthropogenic activities, by examining total organic carbon (TOC), total nitrogen (TN) and isotopes (δ13C and δ15N) tracers in two dated sediment cores. Significantly higher TOC and TN burial, up to 416.4 ± 65.0 and 0.7 ± 0.1 g m−2 year−1 respectively, were observed after an uncontrolled urban expansion starting in the early 1970's to the 1990's. The TOC and TN burial rates were up to twofold higher than those observed for preserved coastal marshes. Furthermore, the decreased δ13C values (−16.1 ± 0.6 ‰) and increasing δ15N values (+10.6 ± 2.6 ‰) indicate higher deposition of algal material and urban sewage during the same period. The higher burial rates during 1970's–1990's and reduced rates thereafter evidenced the role of coastal marsh ecosystems plays in sequestering carbon and nutrients.

Original languageEnglish
Article number113948
JournalMarine Pollution Bulletin
Volume181
DOIs
StatePublished - Aug 2022

Keywords

  • Carbon burial
  • Eutrophication
  • Organic matter source
  • Peruvian coastal marsh
  • Urban expansion

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