Abstract:
Marine ecosystems are under the increasing stress of natural and anthropogenic climate variability and change. Knowledge of the patterns of distribution of chlorophyll concentrations as an indicator of phytoplankton abundance, its spatial and temporal variability, and the processes that control this variability is required to better understand the dynamics of marine populations and their fluctuations, including species of ecological and commercial importance. The Patagonia (PLME), South Brazil (SBLME), Humboldt (HLME), and Pacific Coastal Central America (PCACLME) Large Marine Ecosystems (LMEs) around South and Western Central America support high primary productivity and fisheries catch. During the past few decades, climate change and warming in most ecosystems has become evident, which in combination with variations in production rates could impact the dynamics of marine ecosystems. The goal of this study is to assess the variability and longer-term trends in chlorophyll concentrations in the PLME, SBLME, HLME, and PCACLME, and to discuss implications for higher trophic levels. We use a combination of high-resolution satellite-derived chlorophyll concentration data from SeaWiFS (1997-2006) and MODIS Aqua (2002-2017) to examine spatial and temporal variability and analyze the record-length linear trends in these LMEs (25°N-60°S, 30-120°W). We use monthly composites with 2 × 2 km spatial resolution for the period of overlap between sensors (2002-2006) to compare retrievals and adjust the MODIS Aqua data series at all pixels using linear regressions. We then apply the corrections to the MODIS data and combine the SeaWiFS and adjusted MODIS datasets to generate the longest time series in chlorophyll concentrations to date in the region. Our results revealed significant increases in chlorophyll concentrations in large areas of the PLME (78.23%) and HLME (43.03%) during the last ~20 years, with large potential implications for trophic relationships and the reproductive success of fish. For the mostly subtropical SBLME (26.35%) and tropical PCACLME (13.35%), increasing trends were detected only in relatively small regions, while changes in the PLME and HLME are widespread. Results from this study contribute to a better understanding of the potential effects of environmental change on ecosystem dynamics and provide new tools to assess longer-term trends in satellite chlorophyll concentrations. © 2017 Marrari, Piola and Valla.
Registro:
Documento: |
Artículo
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Título: | Variability and 20-year trends in satellite-derived surface chlorophyll concentrations in large marine ecosystems around South and Western central America |
Autor: | Marrari, M.; Piola, A.R.; Valla, D. |
Filiación: | Departamento de Oceanografía, Servicio de Hidrografía Naval, Buenos Aires, Argentina Consejo Nacional de Investigaciones Científicas y Técnicas, Buenos Aires, Argentina Instituto Franco-Argentino sobre Estudios de Clima y sus Impactos, Universidad de Buenos Aires, Buenos Aires, Argentina Departamento de Ciencias de Atmósfera y los Océanos, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina
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Palabras clave: | Central America; Chlorophyll concentrations; Climate change; Large Marine Ecosystems; MODIS; SeaWiFS; South America; Trends |
Año: | 2017
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Volumen: | 4
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Número: | NOV
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DOI: |
http://dx.doi.org/10.3389/fmars.2017.00372 |
Título revista: | Frontiers in Marine Science
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Título revista abreviado: | Front. Mar. Sci.
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ISSN: | 22967745
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Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_22967745_v4_nNOV_p_Marrari |
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Citas:
---------- APA ----------
Marrari, M., Piola, A.R. & Valla, D.
(2017)
. Variability and 20-year trends in satellite-derived surface chlorophyll concentrations in large marine ecosystems around South and Western central America. Frontiers in Marine Science, 4(NOV).
http://dx.doi.org/10.3389/fmars.2017.00372---------- CHICAGO ----------
Marrari, M., Piola, A.R., Valla, D.
"Variability and 20-year trends in satellite-derived surface chlorophyll concentrations in large marine ecosystems around South and Western central America"
. Frontiers in Marine Science 4, no. NOV
(2017).
http://dx.doi.org/10.3389/fmars.2017.00372---------- MLA ----------
Marrari, M., Piola, A.R., Valla, D.
"Variability and 20-year trends in satellite-derived surface chlorophyll concentrations in large marine ecosystems around South and Western central America"
. Frontiers in Marine Science, vol. 4, no. NOV, 2017.
http://dx.doi.org/10.3389/fmars.2017.00372---------- VANCOUVER ----------
Marrari, M., Piola, A.R., Valla, D. Variability and 20-year trends in satellite-derived surface chlorophyll concentrations in large marine ecosystems around South and Western central America. Front. Mar. Sci. 2017;4(NOV).
http://dx.doi.org/10.3389/fmars.2017.00372