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Letelier, Ricardo M.
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- Creator:
- Gradoville, Mary R., White, Angelicque E., and Letelier, Ricardo M.
- Abstract:
- We investigated the effects of elevated pCO₂ on cultures of the unicellular N₂-fixing cyanobacterium Crocosphaera watsonii WH8501. Using CO₂-enriched air, cultures grown in batch mode under high light intensity were exposed to initial conditions approximating current atmospheric CO₂ concentrations (~400 ppm) as well as CO₂ levels corresponding to low- and...
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- *, Angelicque E. White, Ricardo M. Letelier Oregon State University, College of Earth, Ocean, and Atmospheric
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- Creator:
- Gradoville, Mary R., White, Angelicque E., and Letelier, Ricardo M.
- Abstract:
- We investigated the effects of elevated pCO₂ on cultures of the unicellular N₂-fixing cyanobacterium Crocosphaera watsonii WH8501. Using CO₂-enriched air, cultures grown in batch mode under high light intensity were exposed to initial conditions approximating current atmospheric CO₂ concentrations (~400 ppm) as well as CO₂ levels corresponding to low- and...
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- Creator:
- Dore, John E., Church, Matthew J., Karl, David M., Sadler, Daniel W., and Letelier, Ricardo M.
- Abstract:
- Sustained time series have provided compelling evidence for progressive acidification of the surface oceans through exchange with the growing atmospheric reservoir of carbon dioxide. However, few long-term programs exist, and extrapolation of results from one site to larger oceanic expanses is hampered by the lack of spatial coverage inherent to...
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- ., Church, M. J., Karl, D. M., Sadler, D. W., & Letelier, R. M. (2014). Paired windward and leeward
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- Creator:
- Dore, John E., Church, Matthew J., Karl, David M., Sadler, Daniel W., and Letelier, Ricardo M.
- Abstract:
- Sustained time series have provided compelling evidence for progressive acidification of the surface oceans through exchange with the growing atmospheric reservoir of carbon dioxide. However, few long-term programs exist, and extrapolation of results from one site to larger oceanic expanses is hampered by the lack of spatial coverage inherent to...
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- Creator:
- Wilson, Samuel T., Barone, Benedetto, Ascani, Francois, Juranek, Laurie W., Letelier, Ricardo M., White, Angelicque E., and et al.
- Abstract:
- Time-series observations are critical to understand the structure, function, and dynamics of marine ecosystems. The Hawaii Ocean Time-series program has maintained near-monthly sampling at Station ALOHA (22°45′N, 158°00′W) in the oligotrophic North Pacific Subtropical Gyre (NPSG) since 1988 and has identified ecosystem variability over seasonal to interannual timescales. To further...
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- Ferrón1,2, Jessica N. Fitzsimmons1,6, LaurieW. Juranek7, Zbigniew S. Kolber1,8, Ricardo M. Letelier1,7
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- Creator:
- Wilson, Samuel T., Barone, Benedetto, Ascani, Francois, Juranek, Laurie W., Letelier, Ricardo M., White, Angelicque E., and et al.
- Abstract:
- Time-series observations are critical to understand the structure, function, and dynamics of marine ecosystems. The Hawaii Ocean Time-series program has maintained near-monthly sampling at Station ALOHA (22°45′N, 158°00′W) in the oligotrophic North Pacific Subtropical Gyre (NPSG) since 1988 and has identified ecosystem variability over seasonal to interannual timescales. To further...
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- . Kolber8, Ricardo M. Letelier7, Sandra Martínez-Garcia1,2, David P. Nicholson9, Kelvin J. Richards1
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- Creator:
- Strub, P. Ted, James, Corinne, Combes, Vincent, Matano, Ricardo P., and et al.
- Abstract:
- Altimeter sea surface height (SSH) fields are analyzed to define and discuss the seasonal circulation over the wide continental shelf in the SW Atlantic Ocean (27°–43°S) during 2001–2012. Seasonal variability is low south of the Rio de la Plata (RdlP), where winds and currents remain equatorward for most of the...
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- shelf: 278–438S P. Ted Strub1, Corinne James1, Vincent Combes1, Ricardo P. Matano1, Alberto R. Piola2
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- Creator:
- Strub, P. Ted, James, Corinne, Combes, Vincent, Matano, Ricardo P., and et al.
- Abstract:
- Altimeter sea surface height (SSH) fields are analyzed to define and discuss the seasonal circulation over the wide continental shelf in the SW Atlantic Ocean (27°–43°S) during 2001–2012. Seasonal variability is low south of the Rio de la Plata (RdlP), where winds and currents remain equatorward for most of the...
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- James1, Vincent Combes1, Ricardo P. Matano1, Alberto R. Piola2, Elbio D. Palma3, Martin Saraceno4, Raul
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- Creator:
- Averett, Joshua P., McCune, Bruce, Parks, Catherine G., Naylor, Bridgett J., DelCurto, Tim, and Mata-González, Ricardo
- Abstract:
- Mountain environments are currently among the ecosystems least invaded by non-native species; however, mountains are increasingly under threat of non-native plant invasion. The slow pace of exotic plant invasions in mountain ecosystems is likely due to a combination of low anthropogenic disturbances, low propagule supply, and extreme/steep environmental gradients. The...
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- , Catherine G. Parks3, Bridgett J. Naylor3, Tim DelCurto1, Ricardo Mata-González4 1 Eastern Oregon
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- Creator:
- Averett, Joshua P., McCune, Bruce, Parks, Catherine G., Naylor, Bridgett J., DelCurto, Tim, and Mata-González, Ricardo
- Abstract:
- Mountain environments are currently among the ecosystems least invaded by non-native species; however, mountains are increasingly under threat of non-native plant invasion. The slow pace of exotic plant invasions in mountain ecosystems is likely due to a combination of low anthropogenic disturbances, low propagule supply, and extreme/steep environmental gradients. The...
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- Guerrero, Raul A., Piola, Alberto R., Fenco, Harold, Matano, Ricardo P., Combes, Vincent, Chao, Yi, James, Corinne, Palma, Elbio D., Saraceno, Martin, and Strub, P. Ted
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- Satellite-derived sea surface salinity (SSS) data from Aquarius and SMOS are used to study the shelf-open ocean exchanges in the western South Atlantic near 35°S. Away from the tropics, these exchanges cause the largest SSS variability throughout the South Atlantic. The data reveal a well-defined seasonal pattern of SSS during...
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- . R., Fenco, H., Matano, R. P., Combes, V., Chao, Y., James, C., Palma, E. D., Saraceno, M., & Ted
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- Creator:
- Guerrero, Raul A., Piola, Alberto R., Fenco, Harold, Matano, Ricardo P., Combes, Vincent, Chao, Yi, James, Corinne, Palma, Elbio D., Saraceno, Martin, and Strub, P. Ted
- Abstract:
- Satellite-derived sea surface salinity (SSS) data from Aquarius and SMOS are used to study the shelf-open ocean exchanges in the western South Atlantic near 35°S. Away from the tropics, these exchanges cause the largest SSS variability throughout the South Atlantic. The data reveal a well-defined seasonal pattern of SSS during...
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- hydrographic observations collected between the 50 and 1000 m isobaths (a). Yearly number of observations (b
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- Creator:
- Walters, Helen Marie
- Abstract:
- Hypoxia is a naturally occurring phenomenon that happens seasonally off the Oregon coast. As a consequence, there has been a great deal of research focused around analyzing the strength and duration of the hypoxic event during the summer season. This paper, however, takes an innovative approach by looking at the...
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- from Dr. Ricardo Letelier (CEOAS, OSU) shows isolated Oregon coast SeaWiFS data gridded to 4 km
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- Creator:
- Nechad, B., Ruddick, K., Schroeder, T., Oubelkheir, K., Blondeau-Patissier, D., Cherukuru, N., Brando, V., Dekker, A., Clementson, L., Banks, A. C., Maritorena, S., Werdell, P. J., Sá, C., Brotas, V., Caballero de Frutos, I., Ahn, Y., Salama, S., Tilstone, G., Martinez-Vicente, V., Foley, D., McKibben, M., Nahorniak, J., Peterson, T., Siliò-Calzada, A., Röttgers, R., Lee, Z., Peters, M., and Brockmann, C.
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- The use of in situ measurements is essential in the validation and evaluation of the algorithms that provide coastal water quality data products from ocean colour satellite remote sensing. Over the past decade, various types of ocean colour algorithms have been developed to deal with the optical complexity of coastal...
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- . Martinez-Vicente12, D. Foley13,†, M. McKibben14, J. Nahorniak14, T. Peterson15, A. Siliò-Calzada16, R
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- Creator:
- Ryan, John P., Davis, Curtiss O., Tufillaro, Nicholas B., Kudela, Raphael M., and Gao, Bo-Cai
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- As a demonstrator for technologies for the next generation of ocean color sensors, the Hyperspectral Imager for the Coastal Ocean (HICO) provides enhanced spatial and spectral resolution that is required to understand optically complex aquatic environments. In this study we apply HICO, along with satellite remote sensing and in situ...
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- ., Davis, C. O., Tufillaro, N. B., Kudela, R. M., & Gao, B. C. (2014). Application of the Hyperspectral
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- Creator:
- Melnychuk, Michael C., Essington, Timothy E., Branch, Trevor A., Heppell, Selina S., Jensen, Olaf P., Link, Jason S., Martell, Steven J. D., Parma, Ana M., and Smith, Anthony D. M.
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- Individual quota (IQ) management systems in commercial marine fisheries are highly diverse, differing in the security, durability and exclusivity of the harvesting privilege and the transferability of quota units. This diversity in the degree of harvest rights may influence the effectiveness of IQ fisheries to meet management objectives. We conducted...
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- ,†, Olaf P Jensen3,†, Jason S Link4,†, Steven J D Martell5,†, Ana M Parma6,† & Anthony D M Smith7
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- Creator:
- Fister, Andrew S., O'Neil, Shawn T., Shi, Zi, Zhang, Yufan, Tyler, Brett M., Guiltinan, Mark J., and Maximova, Siela N.
- Abstract:
- Understanding the genetic basis of pathogen susceptibility in various crop plants is crucial to increasing the stability of food, feed, and fuel production. Varietal differences in defence responses provide insights into the mechanisms of resistance and are a key resource for plant breeders. To explore the role of salicylic acid...
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- treatment Andrew S. Fister1, Shawn T. O’Neil2, Zi Shi3, Yufan Zhang1, Brett M. Tyler2,4, Mark J
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- Creator:
- Wallace, Zachary P., Kennedy, Patricia L., Squires, John R., Oakleaf, Robert J., Olson, Lucretia E., and Dugger, Katie M.
- Abstract:
- Grassland and shrubland birds are declining globally due in part to anthropogenic habitat modification. Because population performance of these species is also influenced by non-anthropogenic factors, it is important to incorporate all relevant ecological drivers into demographic models. We used design-based sampling and occupancy models to test relationships of environmental...
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- . Olson3, Katie M. Dugger5 1 Department of Fisheries andWildlife, Oregon State University, Corvallis
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- Creator:
- José Pérez-Alvarez, María, Olavarría, Carlos, Moraga, Rodrigo, Baker, C. Scott, Hamner, Rebecca M., and Poulin, Elie
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- Understanding genetic differentiation and speciation processes in marine species with high dispersal capabilities is challenging. The Chilean dolphin, Cephalorhynchus eutropia, is the only endemic cetacean of Chile and is found in two different coastal habitats: a northern habitat with exposed coastlines, bays and estuaries from Valparaíso (33°02' S) to Chiloé...
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- Endemic Chilean Dolphin Pérez-Alvarez, M. J., Olavarría, C., Moraga, R., Baker, C. S., Hamner, R. M
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- Creator:
- Srain, B., Pantoja, S., Sepúlveda, J., Lange, C. B., Muñoz, P., Summons, R. E., McKay, J., and Salamanca, M.
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- We reconstructed oxygenation changes in the upwelling ecosystem off Concepción (36° S), Chile, using inorganic and organic proxies in a sediment core covering the last ca. 110 years of sedimentation in this area. Authigenic enrichments of Mo, U and Cd were observed between ca. 1935 and 1971 CE, implying a...
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- ., Sepúlveda, J., Lange, C. B., Muñoz, P., Summons, R. E., McKay, J., & Salamanca, M. (2015). Interdecadal
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- Creator:
- Srain, B., Pantoja, S., Sepúlveda, J., Lange, C. B., Muñoz, P., Summons, R. E., McKay, J., and Salamanca, M.
- Abstract:
- We reconstructed oxygenation changes in the Oxygen Minimum Zone of the upwelling ecosystem off Concepción (36° S), Chile, using inorganic and organic proxies in a sediment core covering the last ca. 110 years of sedimentation in this area. Authigenic enrichments of Mo, U and Cd were observed between ca. 1935–1971...
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- ., Pantoja, S., Sepúlveda, J., Lange, C. B., Muñoz, P., Summons, R. E., McKay, J., and Salamanca, M. (2015
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- Creator:
- Hewson, Ian, Eggleston, Erin M., Doherty, Mary, Lee, Dong Yoon, Owens, Michael, Shapleigh, James P., Cornwell, Jeffrey C., and Crump, Byron C.
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- We used metatranscriptomics to study the gene transcription patterns of microbial plankton (0.2 to 64 μm) at a mesohaline station in the Chesapeake Bay under transitions from oxic to anoxic waters in spring and from anoxic to oxic waters in autumn. Samples were collected from surface (i.e., above pycnocline) waters...
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- Bay during Oxic-Anoxic-Oxic Transitions Hewson, I., Eggleston, E. M., Doherty, M., Lee, D. Y., Owens
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- Creator:
- Walters, Helen Marie
- Abstract:
- Hypoxia is a naturally occurring phenomenon that happens seasonally off the Oregon coast. As a consequence, there has been a great deal of research focused around analyzing the strength and duration of the hypoxic event during the summer season. This paper, however, takes an innovative approach by looking at the...
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- ). Cumulative SeaWiFS, Oregon gridded, 4 km, 7-day composite, chlorophyll-a (mg m -3 ) (Ricardo Letelier
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- Creator:
- Boyd, Timothy John, 1958-2013, Levine, Murray D., Kosro, P. Michael, 1951-, Gard, Steve R., Waldorf, Walt, and Oregon State University. College of Oceanic and Atmospheric Sciences
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- , Doug Caldwell, Timothy Cowles, Jianping Gan, Burke Hales, Ricardo Letelier, James Moum, William
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- Creator:
- Boyd, Timothy John, 1958-2013 and Oregon State University. College of Oceanic and Atmospheric Sciences
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- Caldwell, Timothy Cowles, Jianping Gan, Burke Hales, Ricardo Letelier, James Mourn, William Peterson (also
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- Creator:
- Gradoville, Mary Rose
- Abstract:
- Marine bacteria play vital roles in every niche of the ocean, from small-scale symbioses to large-scale productivity and the regulation of Earth’s climate. Recent advances in molecular tools now allow us to probe the genetic potential of entire microbial communities. The next step is linking these diverse communities to the...
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- projects. My committee members, Byron Crump, Ricardo Letelier, Burke Hales, Claudia Häse, and Staci
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- Creator:
- Muglia, Juan and Schmittner, Andreas
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- Previous Paleoclimate Model Intercomparison Project (PMIP) simulations of the Last Glacial Maximum (LGM) Atlantic Meridional Overturning Circulation (AMOC) showed dissimilar results on transports and structure. Here we analyze the most recent PMIP3 models, which show a consistent increase (on average by 41 ± 26%) and deepening (663 ± 550 m)...
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- consistent increase (on average by 41±26%) and deepening (663±550 m) of the AMOC with respect to
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- Creator:
- O'Malley, Robert T., Behrenfeld, Michael J., Westberry, Toby K., Milligan, Allen J., Shang, Shaoling, and Yan, Jing
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- Since June 2010, the Geostationary Ocean Color Imager (GOCI) has been collecting the first diurnally resolved satellite ocean measurements. Here GOCI retrievals of phytoplankton chlorophyll concentration and fluorescence are used to evaluate daily to seasonal changes in photophysiological properties. We focus on nonphotochemical quenching (NPQ) processes that protect phytoplankton from...
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- * variability as a function of photoacclimation state. References Abbott, M. R., and R. M. Letelier (1999
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- Puigcorbé, Viena, Benitez-Nelson, Claudia R., Masqué, Pere, and Prahl, Fredrick G.
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- Summertime carbon, nitrogen, and biogenic silica export was examined using ²³⁴Th:²³⁸U disequilibria combined with free floating sediment traps and fine scale water column sampling with in situ pumps (ISP) within the Eastern Tropical North Pacific and the Gulf of California. Fine scale ISP sampling provides evidence that in this system,...
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- particles, converging to 1–5 μmol dpm�1 by 100 m. Comparison of elemental particle composition, coupled with
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- O'Malley, Robert T., Barth, John A., Oregon State University. College of Oceanic and Atmospheric Sciences, and Global Ocean Ecosystems Dynamics (Program)
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- Student OPC Ricardo Letelier* Scientist underway nutrients/FRR/drifters Amanda Ashe Technician
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- Menge, Bruce A., Gouhier, Tarik C., Hacker, Sally D., Chan, Francis, and Nielsen, Karina J.
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- Ecosystems are shaped by processes occurring and interacting over multiple temporal and spatial scales. Theory suggests such complexity can be simplified by focusing on processes sharing the same scale as the pattern of interest. This scale-dependent approach to studying communities has been challenged by multiscale meta-ecosystem theory, which recognizes that...
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- - (100s of km), meso- (10s of km), and local scale (100s of m). It assumes that local communities occur in
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- Krause, Jeffrey W.
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- Diatoms are a ubiquitous group of plankton responsible for 20-40% of oceanic primary production, and a higher fraction of organic matter export to the ocean interior. Diatoms actively transport dissolved inorganic silicon into their cells, and through the process of silicification (i.e. biogenic silica production) they build tough and intricate...
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- . • Ricardo Letelier, Pete Strutton, Tim Cowles, and Peter Bottomley. Ricardo and Pete, you both gave me
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- Creator:
- Dittrich, Jake E.
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- Global atmospheric carbon levels are continuing to rise from pre-industrial revolution levels. One of the main regulators of global atmospheric carbon levels, and thus climate, is the world's oceans. Unicellular marine cyanobacteria account for a large percent of total marine carbon fixation. We measured chlorophyll-specific ¹⁴C uptake rates (P[superscript b])...
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- rates. Works Cited Behrenfeld, M., Boss, E., Falkowski, P., Feldman, G., Letelier, R., McClain
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- Creator:
- White, Angelicque E., Watkins-Brandt, Katie S., McKibben, S. Morgaine, Du, Xiuning, Peterson, William T., and et al.
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- Significant seabird mortality on the Oregon (OR) and Washington (WA) coast in 2009 has been attributed to a massive bloom of the dinoflagellate Akashiwo sanguinea (K. Hirasaka) G. Hansen & Ø. Moestrup. Initial, albeit limited, observations suggested this bloom began in WA and reached OR waters through southward transport. Here,...
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- Northern California current system in 2009 White, A. E., Watkins-Brandt, K. S., McKibben, S. M., Wood, A
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- Creator:
- Schmittner, A. and Somes, C. J.
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- A three-dimensional, process-based model of the ocean’s carbon and nitrogen cycles, including 13C and 15N isotopes, is used to explore effects of idealized changes in the soft-tissue biological pump. Results are presented from one preindustrial control run (piCtrl) and six simulations of the Last Glacial Maximum (LGM) with increasing values...
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- concentrations below 5μM. It fractionates strongly (εWCD =�25‰) by preferentially removing the light 14N isotope
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- Creator:
- Siegel, D. A., Buesseler, K. O., Doney, S. C., Sailley, S. F., Behrenfeld, Michael J., and Boyd, P. W.
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- The export of organic carbon from the surface ocean by sinking particles is an important, yet highly uncertain, component of the global carbon cycle. Here we introduce a mechanistic assessment of the global ocean carbon export using satellite observations, including determinations of net primary production and the slope of the...
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- and food-web models Siegel, D. A., K. O. Buesseler, S. C. Doney, S. F. Sailley, M. J. Behrenfeld, and
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- Creator:
- Gladics, Amanda J.
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- Variable ocean conditions can greatly impact lower trophic level prey assemblages in marine ecosystems, with effects propagating up to higher trophic levels. Our goal was to better understand how varying ocean conditions influence diets and niche overlap among a suite of low- to mid trophic level predators. We studied the...
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- : _____________________________________________________________________ Robert M. Suryan Variable ocean conditions can greatly impact lower trophic level prey
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- Zhu, Yajuan, Wang, Guojie, and Li, Renqiang
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- Water is a limiting factor for plant growth and vegetation dynamics in alpine sandy land of the Tibetan Plateau, especially with the increasing frequency of extreme precipitation events and drought caused by climate change. Therefore, a relatively stable water source from either deeper soil profiles or ground water is necessary...
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- 11 (5): e0156586. doi:10.1371/journal.pone.0156586 Editor: Ricardo Aroca, Estación Experimental del
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- Menge, Bruce A., Cerny-Chipman, Elizabeth B., Johnson, Angela, Sullivan, Jenna, Gravem, Sarah, and Chan, Francis
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- Sea star wasting disease (SSWD) first appeared in Oregon in April 2014, and by June had spread to most of the coast. Although delayed compared to areas to the north and south, SSWD was initially most intense in north and central Oregon and spread southward. Up to 90% of individuals...
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- , and scaled in m depth. doi:10.1371/journal.pone.0153994.g001 Ecology of Sea Star Wasting Disease
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- Creator:
- Meyer, Eli, Aspinwall, Michael J., Lowry, David B., Palacio-Mejía, Juan Diego, Logan, Tierney L., Fay, Philip A., and Juenger, Thomas E.
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- BACKGROUND: In light of the changes in precipitation and soil water availability expected with climate change, understanding the mechanisms underlying plant responses to water deficit is essential. Toward that end we have conducted an integrative analysis of responses to drought stress in the perennial C₄ grass and biofuel crop, Panicum...
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- virgatum L.) Meyer, E., Aspinwall, M. J., Lowry, D. B., Palacio-Mejía, J. D., Logan, T. L., Fay, P. A
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- Garbarino, Angelina R.
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- This paper addresses how the implementation of North American Free Trade Agreement (NAFTA) has affected the use of Information Technology (IT) in Mexico. In order to answer this question this thesis analyzes the direct and indirect effects of NAFTA on Mexico’s economic and regulatory environment, and how this influences the...
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- Creator:
- Miles, Evan S.
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- Benton County has experienced substantial growth in the past 30 years, and is expected to continue growing (BCWP 2008). Continued development has occurred in the Willamette Valley, housing development in the nearby hills of the Coast Range is growing. New houses in the foothills of the Coast Range may not...
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- M ar Ap r M ay Ju n Ju l Au g Se p O ct No v De c Precipitation (in) Temperature (degrees
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- Smith, Robert J.
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- Climate and terrestrial vegetation have had mutual feedbacks for nearly five hundred million years, yet both are now departing from recent historical norms, with uncertain implications for forest ecosystems. This dissertation outlines the current and potential future climate responses of lichen and bryophyte communities in the United States as part...
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- present members of the McCune family: Peter Nelson, Heather Root, Ricardo Miranda Gonzalez, Kaleigh
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- Oregon State University Library. Social Sciences & Humanities Department
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- , 3:3-4 NIXON, RICHARD M. Nixon convo. Oct. 22, 1954, 2:1-2 Nixon speaks. Oct. 27, 1954, 2:1-2
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- Oregon State University. Agricultural Experiment Station and United States. Agency for International Development
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- AGRONOMY IN THE SOUTHERN CONE OF LATIN AMERICA M. A. McMahon When we speak of the growing conditions of
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- Oregon State University Library. Social Sciences & Humanities Department
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- . Economics prof lists Argentinan. lectures. May 13, 1966, 4:3-4 -MCFARLAND, HELEN M. Helen McFarland
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- Oregon State University. Agricultural Experiment Station and United States. Agency for International Development
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- que varfan entre 0 a 120 m sobre el nivel del mar y cliffaticamente entre las isohietas de 700 a 950