Bio-optical characteristics and primary productivity during upwelling and non-upwelling conditions in a highly productive coastal ecosystem off central Chile (∼36°S)
Abstract
Variability of several bio-optical and photosynthetic properties of phytoplankton in the highly productive coast off Concepción, central Chile (∼36°S) was quantified during contrasting seasons at offshore, shelf, and nearshore sites. During October 1998 (upwelling) and July 1999 (non-upwelling), 21 stations were sampled for chlorophyll-a, pigment spectral light absorption, primary production, and attenuation coefficients (kλ) of downwelling irradiance (Ed(λ)); kλ was used to estimate the depth of the euphotic zone (Zeu). Primary production was measured through 14C-fixation experiments using simulated in situ and in situ incubations with water from six depths within the Zeu. The photosynthetic parameters (αB, PBmax) were obtained through photosynthesis-irradiance experiments with samples from two Zeu depths. Bio-optical properties showed large spatial variability during both seasons, including spectral in vivo phytoplankton absorption (aph(λ)), pigment specific phytoplankton absorption (a*(λ)) within the upper 25 m, and water-column transmittance (T(λ)), calculated for the upper 10 m using Ed(λ) at four wavelengths. Under non-upwelling conditions, a*(λ), T(λ), and αB presented higher values whereas a ph(λ) values decreased accordingly. Under upwelling conditions, primary productivity ranged from 0.7 to 7.5 g C m-2 d-1 at the coastal stations and was <0.6 g C m-2 d -1 at the oceanic stations; in the non-upwelling season, values over the entire area ranged from 0.2 to 1.9 g C m-2 d-1. The significant correlations found among bio-optical properties and physiological parameters highlight both the short- and long-term changes in the area's environmental conditions. The combination of three independent biological parameters - αB, PBmax, and a ph(442) - accounted for most of the horizontal and vertical variability among and within stations for each cruise. These results support a distinction of different functional zones for the two contrasting upwelling conditions. © 2004 Elsevier Ltd. All rights reserved.
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- Authors
- Montecino, V., Astoreca, R., Alarcón, G., Retamal, L., & Pizarro, G.
- Affiliations
- University of Chile (CL)
- Université Libre de Bruxelles (BE)
- University of Concepción (CL)
- Université Laval (CA)
- Instituto de Fomento Pesquero (CL)
- Corresponding author
- Montecino, Vivian
- Venue
- Deep-Sea Research Part II: Topical Studies in Oceanography
- Publisher
- Elsevier BV
- Published
- 2004-10
- Volume
- 51
- Issue
- 20-21
- Pages
- 2413-2426
- ISSN
- 0967-0645 (ISSN-L)
- OpenAlex
- W2071351290
- Cited by
- 43
- References
- 42
- Citations by year
- 2026: 1 · 2025: 2 · 2024: 2 · 2023: 2 · 2021: 2 · 2020: 1 · 2019: 1 · 2018: 2 · 2016: 2 · 2015: 1 · 2014: 2 · 2013: 1 · 2012: 1
- FWCI
- 3.68
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Deep Sea Research Part II Topical Studies in Oceanography (publishedVersion)
- Dépôt institutionnel de l'Université libre de Bruxelles (Université Libre de Bruxelles) (submittedVersion)
- Flanders Marine Institute (Flanders Marine Institute) (submittedVersion)
- Funders
- Oregon State University
- Comisión Nacional de Investigación Científica y Tecnológica
- Topics
- Physical Sciences › Earth and Planetary Sciences › Oceanography › Marine and coastal ecosystems
- Physical Sciences › Earth and Planetary Sciences › Oceanography › Oceanographic and Atmospheric Processes
- Physical Sciences › Environmental Science › Environmental Chemistry › Aquatic Ecosystems and Phytoplankton Dynamics
- Keywords
- coastal upwelling, phytoplankton photosynthesis, primary productivity, bio-optical properties, chlorophyll a, pigment absorption, euphotic depth, light attenuation, photosynthesis-irradiance, maximum photosynthetic rate, seasonal variation, functional zones
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