Response of three paleo-primary production proxy measures to development of an urban estuary

G. L. Chmura, A. Santos, Vera Pospelova, Z. Spasojevic, R. Lam, J. S. Latimer

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

In this study we present a novel comparison of three proxy indicators of paleoproductivity, pigments, biogenic silica (BSi), and cysts of autotrophic dinoflagellates measured in cored sediments from New Bedford Harbor, Massachusetts. In addition to detailed historical reports we use palynological signals of land clearance, changes in the ratio of centric and pennate diatoms, sedimentary organic carbon and stable carbon isotopes to constrain our interpretations. Our study spans the period from prior to European settlement to ∼1977, during which watersheds were cleared, port development occurred and much of the coastal property became industrialized. The combined effects of nutrient loading from watershed clearance and urban sewage on the estuarine ecosystem shifted not only levels of primary production, but also the nature of the production. Our proxies show that when European colonists first arrived the estuarine production was benthic-dominated, but eventually became pelagic-dominated. Importance of water column production (by diatoms and dinoflagellates) rapidly increased as soil nitrogen was released following forest clearance. Stabilization in rates of forest clearance is reflected as a decline in production. However, population increases in the urbanizing watershed brought new sources of nutrients through direct sewage discharge, apparently again stimulating primary production. We assume that early 20th century changes in sewage discharge and introduction of heavy metals into Harbor waters caused a temporary reduction in primary production. The introduction of a new sewer outfall near the core site and changes in estuarine hydrography due to construction of a hurricane barrier across the mouth of the harbor are reflected by renewed water column production, but decreases in the population of diatoms and dinoflagellates. Fossil pigments suggest renewed water column production in the latest years recorded by our sediment core.

Original languageEnglish (US)
Pages (from-to)225-243
Number of pages19
JournalScience of the Total Environment
Volume320
Issue number2-3
DOIs
StatePublished - Mar 29 2004

Fingerprint

Estuaries
dinoflagellate
forest clearance
primary production
harbor
diatom
sewage
water column
estuary
watershed
pigment
port development
paleoproductivity
estuarine ecosystem
nutrient
hydrography
Sewage
soil nitrogen
cyst
Ports and harbors

Keywords

  • Algal blooms
  • Benthic algae
  • Buzzards Bay
  • Forest clearance
  • Industrialization
  • Phytoplankton
  • Pollution
  • Urbanization

Cite this

Response of three paleo-primary production proxy measures to development of an urban estuary. / Chmura, G. L.; Santos, A.; Pospelova, Vera; Spasojevic, Z.; Lam, R.; Latimer, J. S.

In: Science of the Total Environment, Vol. 320, No. 2-3, 29.03.2004, p. 225-243.

Research output: Contribution to journalArticle

Chmura, G. L. ; Santos, A. ; Pospelova, Vera ; Spasojevic, Z. ; Lam, R. ; Latimer, J. S. / Response of three paleo-primary production proxy measures to development of an urban estuary. In: Science of the Total Environment. 2004 ; Vol. 320, No. 2-3. pp. 225-243.
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