Archives of Environmental Contamination and Toxicology

, Volume 53, Issue 2, pp 159–167

Recent Sedimentary History of Organic Matter and Nutrient Accumulation in the Ohuira Lagoon, Northwestern Mexico

  • Ana Carolina Ruiz-Fernández
  • Mauro Frignani
  • Tommaso Tesi
  • Humberto Bojórquez-Leyva
  • Luca Giorgio Bellucci
  • Federico Páez-Osuna
Article

DOI: 10.1007/s00244-006-0122-3

Cite this article as:
Ruiz-Fernández, A.C., Frignani, M., Tesi, T. et al. Arch Environ Contam Toxicol (2007) 53: 159. doi:10.1007/s00244-006-0122-3

Abstract

210Pb-derived sediment accumulation rates, as well as a suite of geochemical proxies (Al, Fe, δ13C, δ15N), were used to assess the time-dependent variations of C, N, and P fluxes recorded in two sediment cores collected at Ohuira Lagoon, in the Gulf of California, Mexico, during the last 100 years. Sedimentary C, N, and P concentrations increased with time and were related to land clearing, water impoundment, and agriculture practices, such as fertilization. C:N:P ratios and δ13C suggested an estuarine system that is responsive to increased C loading from a N-limited phytoplankton community, whereas δ15N values showed the transition between an estuarine-terrestrial to an estuarine-more marine environment, as a consequence of the declining freshwater supply into the estuary due to the channeling and impoundment of El Fuerte River between 1900 and 1956. The recent increases in nutrient fluxes (2- to 9-fold the pre-anthropogenic fluxes of C and N, and 2 to 13 times for P) taking place in the mainland from the 1940s, were related to the expansion of the intensive agriculture fields and to the more recent development of shrimp farming activities.

Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  • Ana Carolina Ruiz-Fernández
    • 1
  • Mauro Frignani
    • 2
  • Tommaso Tesi
    • 2
  • Humberto Bojórquez-Leyva
    • 1
  • Luca Giorgio Bellucci
    • 2
  • Federico Páez-Osuna
    • 1
    • 3
  1. 1.Universidad Nacional Autónoma de MéxicoInstituto de Ciencias del Mar y LimnologíaMazatlanMéxico
  2. 2.Istituto di Scienze Marine, CNRBolognaItaly
  3. 3.El Colegio de SinaloaPte. CuliacánMéxico