Prof. Dr. Francisco Chavez de la O

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Academic Career Length

36Years (1991-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

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5 January 2018 in Science

Journal Article

Declining oxygen in the global ocean and coastal waters

Francisco Chavez de la O

Jing Zhang

+16

Beneath the waves, oxygen disappears: As plastic waste pollutes the oceans and fish stocks decline, unseen below the surface another problem grows: deoxygenation. Breitburg et al. review the evidence for the downward trajectory of oxygen levels in increasing areas of the open ocean and coastal waters. Rising nutrient loads coupled with climate change—each resulting from human activities—are changing ocean biogeochemistry and increasing oxygen consumption. This results in destabilization of sediments and fundamental shifts in the availability of key nutrients. In the short term, some compensatory effects may result in improvements in local fisheries, such as in cases where stocks are squeezed between the surface and elevated oxygen minimum zones. In the longer term, these conditions are unsustainable and may result in ecosystem collapses, which ultimately will cause societal and economic harm. Science , this issue p. eaam7240

10 January 2003 in Science

Journal Article

From Anchovies to Sardines and Back: Multidecadal Change in the Pacific Ocean

Francisco Chavez de la O

John Ryan

Salvador E Lluch-Cota

Miguel Ñiquen C.

In the Pacific Ocean, air and ocean temperatures, atmospheric carbon dioxide, landings of anchovies and sardines, and the productivity of coastal and open ocean ecosystems have varied over periods of about 50 years. In the mid-1970s, the Pacific changed from a cool “anchovy regime” to a warm “sardine regime.” A shift back to an anchovy regime occurred in the middle to late 1990s. These large-scale, naturally occurring variations must be taken into account when considering human-induced climate change and the management of ocean living resources.

10 December 1999 in Science

Journal Article

Biological and Chemical Response of the Equatorial Pacific Ocean to the 1997-98 El Niño

Francisco Chavez de la O

P. G. Strutton

G. E. Friederich

R. A. Feely

G. C. Feldman

M. J. McPhaden

During the 1997–98 El Niño, the equatorial Pacific Ocean retained 0.7 × 10 ¹⁵ grams of carbon that normally would have been lost to the atmosphere as carbon dioxide. The surface ocean became impoverished in plant nutrients, and chlorophyll concentrations were the lowest on record. A dramatic recovery occurred in mid-1998, the system became highly productive, analogous to coastal environments, and carbon dioxide flux out of the ocean was again high. The spatial extent of the phytoplankton bloom that followed recovery from El Niño was the largest ever observed for the equatorial Pacific. These chemical and ecological perturbations were linked to changes in the upwelling of nutrient-enriched waters. The description and explanation of these dynamic changes would not have been possible without an observing system that combines biological, chemical, and physical sensors on moorings with remote sensing of chlorophyll.

15 January 2011 in Annual Review of Marine Science

Journal Article

Marine Primary Production in Relation to Climate Variability and Change

Francisco Chavez de la O

Monique Messié

J. Timothy Pennington

Marine photosynthetic plankton are responsible for approximately 50 petagrams (10¹⁵) of carbon per year of net primary production, an amount equivalent to that on land. This primary production supports essentially all life in the oceans and profoundly affects global biogeochemical cycles and climate. This review discusses the general distribution of primary production in the sea, the processes that regulate this distribution, and how marine primary production is sensitive to climate variability and change. Statistical modes of ocean variability and their characteristic interannual to multi-decadal timescales over the last century are described. Recent in situ and satellite time-series of primary production can be clearly linked to interannual ocean variability. Global marine primary production appears to have increased over the past several decades in association with multi-decadal variations. A paleoclimate record extends discussion to the centennial scale, providing contrasting insights into how marine primary production might vary in the future.

1 April 1999 in Deep Sea Research Part I: Oceanographic Research Papers

Journal Article

The nitrogen isotope biogeochemistry of sinking particles from the margin of the Eastern North Pacific

Carol Pride

14 January 2020 in Nature Communications

Journal Article

Environmental DNA reveals seasonal shifts and potential interactions in a marine community

Ryan P. Kelly

Reiko P. Michisaki

+10

Environmental DNA (eDNA) analysis allows the simultaneous examination of organisms across multiple trophic levels and domains of life, providing critical information about the complex biotic interactions related to ecosystem change. Here we used multilocus amplicon sequencing of eDNA to survey biodiversity from an eighteen-month (2015–2016) time-series of seawater samples from Monterey Bay, California. The resulting dataset encompasses 663 taxonomic groups (at Family or higher taxonomic rank) ranging from microorganisms to mammals. We inferred changes in the composition of communities, revealing putative interactions among taxa and identifying correlations between these communities and environmental properties over time. Community network analysis provided evidence of expected predator-prey relationships, trophic linkages, and seasonal shifts across all domains of life. We conclude that eDNA-based analyses can provide detailed information about marine ecosystem dynamics and identify sensitive biological indicators that can suggest ecosystem changes and inform conservation strategies.

About Me

Francisco Chávez de la O received his PhD in computer science from the University of Extremadura in 2012. Since 2001, he has belonged to the Department of Computer Engineering and Telematic Systems of the University of Extremadura. He is currently an associate professor, and he belongs to the Artificial Evolution Research Group. He has more than 60 national and international publications. He has worked as a researcher in several research projects granted by the Spanish government; he has been a principal researcher in two of them, EPHEMCH and DEEPBIO. Moreover, he is a principal researcher in SEECS. He has also worked as a researcher in several research projects granted by the Autonomous Community of Extremadura. Recently, he has led a project granted by the Autonomous Community of Extremadura in the field of agriculture "Study of evolution and ripening of Japanese plum tree by means of hyperspectral analysis and intelligent systems". He is the head of the "Escuelas Municipales de Jóvenes Científicos", founded in 2015, the largest STEM initiative in Spain. Finally, he has worked on several projects with companies in the sector in the field of technology transfer with companies. He has three patents, and his lines of research focus on fuzzy rule-based systems and fuzzy genetic systems, image processing using deep learning, and massive data processing, mainly applied to agriculture.

Prof. Dr. Francisco Chavez de la O

Prof. Dr. Francisco Chavez de la O

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About Me