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5. Trophic strategies of picoeukaryotic phytoplankton vary over time and with depth in the North Pacific Subtropical Gyre.

Author

Edwards, Kyle F., Rii, Yoshimi M., Li, Qian, Peoples, Logan M., Church, Matthew J., and Steward, Grieg F.

Subjects
*EUPHOTIC zone, *MIXING height (Atmospheric chemistry), *AUTOTROPHS, *PROCHLOROCOCCUS, *PROTISTA
Abstract

In oligotrophic oceans, the smallest eukaryotic phytoplankton are both significant primary producers and predators of abundant bacteria such as Prochlorococcus. However, the drivers and consequences of community dynamics among these diverse protists are not well understood. Here, we investigated how trophic strategies along the autotrophy‐mixotrophy spectrum vary in importance over time and across depths at Station ALOHA in the North Pacific Subtropical Gyre. We combined picoeukaryote community composition from a 28‐month time‐series with traits of diverse phytoplankton isolates from the same location, to examine trophic strategies across 13 operational taxonomic units and 8 taxonomic classes. We found that autotrophs and slower‐grazing mixotrophs tended to prevail deeper in the photic zone, while the most voracious mixotrophs were relatively abundant near the surface. Within the mixed layer, there was greater phagotrophy when conditions were most stratified and when Chl a concentrations were lowest, although the greatest temporal variation in trophic strategy occurred at intermediate depths (45–100 m). Dynamics at this site are consistent with previously described spatial patterns of trophic strategies. The success of relatively phagotrophic phytoplankton at shallower depths in the most stratified waters suggests that phagotrophy is a competitive strategy for acquiring nutrients when energy from light is plentiful. [ABSTRACT FROM AUTHOR]

Published
2024
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6. Short‐term variability in euphotic zone biogeochemistry and primary productivity at Station ALOHA: A case study of summer 2012

Author

Wilson, Samuel T, Barone, Benedetto, Ascani, Francois, Bidigare, Robert R, Church, Matthew J, Valle, Daniela A, Dyhrman, Sonya T, Ferrón, Sara, Fitzsimmons, Jessica N, Juranek, Laurie W, Kolber, Zbigniew S, Letelier, Ricardo M, Martínez‐García, Sandra, Nicholson, David P, Richards, Kelvin J, Rii, Yoshimi M, Rouco, Mónica, Viviani, Donn A, White, Angelicque E, Zehr, Jonathan P, and Karl, David M

Subjects
Atmospheric Sciences, Geochemistry, Oceanography, Meteorology & Atmospheric Sciences
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 extend the temporal resolution of these near-monthly time-series observations, an extensive field campaign was conducted during July-September 2012 at Station ALOHA with near-daily sampling of upper water-column biogeochemistry, phytoplankton abundance, and activity. The resulting data set provided biogeochemical measurements at high temporal resolution and documents two important events at Station ALOHA: (1) a prolonged period of low productivity when net community production in the mixed layer shifted to a net heterotrophic state and (2) detection of a distinct sea-surface salinity minimum feature which was prominent in the upper water column (0-50 m) for a period of approximately 30 days. The shipboard observations during July-September 2012 were supplemented with in situ measurements provided by Seagliders, profiling floats, and remote satellite observations that together revealed the extent of the low productivity and the sea-surface salinity minimum feature in the NPSG.

Published
2015

9. New Webinar Series: Voices in Mental Health and Well‐Being in Aquatic Sciences

Author

Bizic, Mina, primary, Bodmer, Pascal, additional, Carvalho, Carolinne R., additional, Gladstone‐Gallagher, Rebecca V., additional, Gushulak, Cale A. C., additional, Lee, Ying Ping, additional, Lowman, Heili E., additional, Oguguah, Ngozi M., additional, Meinikmann, Karin, additional, Rii, Yoshimi M., additional, and Rodríguez‐Cardona, Bianca M., additional

Published
2023
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10. The Silent Mental Health and Well‐Being Crisis of Early Career Researchers in Aquatic Sciences

Author

Gushulak, Cale A. C., primary, Bodmer, Pascal, additional, Carvalho, Carolinne R., additional, Gladstone‐Gallagher, Rebecca V., additional, Lee, Ying Ping, additional, Lowman, Heili E., additional, Oguguah, Ngozi M., additional, Meinikmann, Karin, additional, Rii, Yoshimi M., additional, Rodríguez‐Cardona, Bianca M., additional, and Bizic, Mina, additional

Published
2023
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14. Effects of nutrient enrichments on oligotrophic phytoplankton communities: a mesocosm experiment near Hawai‘i, USA

Author

Böttjer-Wilson, Daniela, White, Angelicque E., Björkman, Karin M., Church, Matthew J., Poulos, Steve, Shimabukuro, Eric, Rii, Yoshimi M., Ludwig, Andrea, von Bröckel, Klaus, Riebesell, Ulf, Letelier, Ricardo M., Karl, David M., Böttjer-Wilson, Daniela, White, Angelicque E., Björkman, Karin M., Church, Matthew J., Poulos, Steve, Shimabukuro, Eric, Rii, Yoshimi M., Ludwig, Andrea, von Bröckel, Klaus, Riebesell, Ulf, Letelier, Ricardo M., and Karl, David M.

Abstract

A large-volume mesocosm-based nutrient perturbation experiment was conducted off the island of Hawai‘I, USA, to investigate the response of surface ocean phytoplankton communities to nutrient addition of macronutrients, trace metals, and vitamins and to assess the feasibility of using mesocosms in the open ocean. Three free-drifting mesocosms (~60 m3) were deployed: one mesocosm served as a control (no nutrient amendments), a second (termed +P) was amended with nitrate (N), silicate (Si), phosphate (P) and a trace metal + vitamin mixture, and a third (termed -P) was amended with N, Si, and a trace metal + vitamin mixture but no P. These mesocosms were unreplicated due to logistical constraints and hence differences between treatments are qualitative. After 6 d, the largest response of the phytoplankton community was observed in the +P mesocosm where chlorophyll a (chl a) and 14C-based primary production were 2–3× greater than the -P mesocosm and 4–6× greater than the control. Comparison between mesocosm and ‘microcosm’ incubations (20 l) revealed differences in the magnitude and timing of production and marked differences in community structure with a reduced response of diatoms in microcosm treatments. Notably, we also observed pronounced declines in Prochlorococcus populations in all treatments: although these were greater in microcosms (up to 99%). Overall, this study confirmed the feasibility of deploying free-drifting mesocosms in the open ocean as a potentially powerful tool to investigate ecological impacts of nutrient perturbations and constitutes a valuable first step towards scaling plankton manipulation experiments.

Published
2021
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16. Mesoscale eddies drive increased silica export in the subtropical pacific ocean

Author

Benitez-Nelson, Claudia R., Bidigare, Robert R., Dickey, Tommy D., Landry, Michael R., Leonard, Carrie L., Brown, Susan L., Nencioli, Francesco, Rii, Yoshimi M., Maiti, Kanchan, Becker, Jamie W., Bibby, Thomas S., Black, Wil, Cai, Wei-Jun, Carlson, Craig A., Chen, Feizhou, Kuwahara, Victor S., Mahaffey, Claire, McAndrew, Patricia M., Quay, Paul D., Rappe, Michael S., Selph, Karen E., Simmons, Melinda P., and Yang, Eun Jin

Subjects
Eddies -- Environmental aspects, Tropical cyclones -- Properties, Silica -- Environmental aspects, Oceanic mixing -- Observations
Published
2007

18. Seasonality and episodic variation in picoeukaryote diversity and structure reveal community resilience to disturbances in the North Pacific Subtropical Gyre.

Author

Rii, Yoshimi M., Peoples, Logan M., Karl, David M., and Church, Matthew J.

Abstract

We examined variability in the euphotic zone (0–175 m) picoeukaryotic community based on time‐series observations (2011–2013) at Station ALOHA in the North Pacific Subtropical Gyre. By sampling over scales ranging from daily to approximately monthly over 2.25 years, we evaluated the resilience of the picoeukaryotic community to seasonal‐ to episodic‐scale physical disturbances, such as convective mixing and mesoscale processes, respectively. We quantified the frequency and intensity of disturbances that altered upper ocean light and nutrients in the context of the Hawaii Ocean Time‐series program climatology, and evaluated picoeukaryotic community resilience based on shifts in dissimilarity in community structure at different depths in the euphotic zone. Our results suggest that in this stratified habitat, picoeukaryote communities are resilient on timescales of days to weeks in response to these physical disturbances, and that the juxtaposition of mesoscale and submesoscale disturbances on more predictable seasonality requires spatially and temporally resolved assessment of community response and resilience. We highlight the value of examining recent (days to weeks) physical forcing of the upper ocean for insight into the influences of physical habitat alterations that structure the contemporaneous plankton community. [ABSTRACT FROM AUTHOR]

Published
2022
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19. Ecomimicry in Indigenous resource management: optimizing ecosystem services to achieve resource abundance, with examples from Hawaiʻi

Author

Winter, Kawika B., primary, Lincoln, Noa Kekuewa, additional, Berkes, Fikret, additional, Alegado, Rosanna A., additional, Kurashima, Natalie, additional, Frank, Kiana L., additional, Pascua, Puaʻala, additional, Rii, Yoshimi M., additional, Reppun, Frederick, additional, Knapp, Ingrid S.S., additional, McClatchey, Will C., additional, Ticktin, Tamara, additional, Smith, Celia, additional, Franklin, Erik C., additional, Oleson, Kirsten, additional, Price, Melissa R., additional, McManus, Margaret A., additional, Donahue, Megan J., additional, Rodgers, Kuulei S., additional, Bowen, Brian W., additional, Nelson, Craig E., additional, Thomas, Bill, additional, Leong, Jo-Ann, additional, Madin, Elizabeth M. P., additional, Rivera, Malia Ana J., additional, Falinski, Kim A., additional, Bremer, Leah L., additional, Deenik, Jonathan L., additional, Gon III, Sam M., additional, Neilson, Brian, additional, Okano, Ryan, additional, Olegario, Anthony, additional, Nyberg, Ben, additional, Kawelo, A. Hiʻilei, additional, Kotubetey, Keliʻi, additional, Kukea-Shultz, J. Kānekoa, additional, and Toonen, Robert J., additional

Published
2020
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20. Collaborative research to inform adaptive comanagement: a framework for the Heʻeia National Estuarine Research Reserve

Author

Winter, Kawika B., primary, Rii, Yoshimi M., additional, Reppun, Frederick A. W. L., additional, Hintzen, Katy DeLaforgue, additional, Alegado, Rosanna A., additional, Bowen, Brian W., additional, Bremer, Leah L., additional, Coffman, Makena, additional, Deenik, Jonathan L., additional, Donahue, Megan J., additional, Falinski, Kim A., additional, Frank, Kiana, additional, Franklin, Erik C., additional, Kurashima, Natalie, additional, Lincoln, Noa Kekuewa, additional, Madin, Elizabeth M. P., additional, McManus, Margaret A., additional, Nelson, Craig E., additional, Okano, Ryan, additional, Olegario, Anthony, additional, Pascua, Pua'ala, additional, Oleson, Kirsten L. L., additional, Price, Melissa R., additional, Rivera, Malia Ana J., additional, Rodgers, Kuulei S., additional, Ticktin, Tamara, additional, Sabine, Christopher L., additional, Smith, Celia M., additional, Hewett, Alice, additional, Kaluhiwa, Rocky, additional, Cypher, Māhealani, additional, Thomas, Bill, additional, Leong, Jo-Ann, additional, Kekuewa, Kristina, additional, Tanimoto, Jean, additional, Kukea-Shultz, Kānekoa, additional, Kawelo, A. Hiʻilei, additional, Kotubetey, Keliʻi, additional, Neilson, Brian J., additional, Lee, Tina S., additional, and Toonen, Robert J., additional

Published
2020
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25. Short-term variability in euphotic zone biogeochemistry and primary productivity at Station ALOHA : a case study of summer 2012

Author

Wilson, Samuel T., Barone, Benedetto, Ascani, Francois, Bidigare, Robert R., Church, Matthew J., del Valle, Daniela A., Dyhrman, Sonya T., Ferroon, Sara, Fitzsimmons, Jessica N., Juranek, Laurie W., Kolber, Zbigniew S., Letelier, Ricardo M., Martinez-Garcia, Sandra, Nicholson, David P., Richards, Kelvin J., Rii, Yoshimi M., Rouco, Monica, Viviani, Donn A., White, Angelicque E., Zehr, Jonathan P., Karl, David M., Wilson, Samuel T., Barone, Benedetto, Ascani, Francois, Bidigare, Robert R., Church, Matthew J., del Valle, Daniela A., Dyhrman, Sonya T., Ferroon, Sara, Fitzsimmons, Jessica N., Juranek, Laurie W., Kolber, Zbigniew S., Letelier, Ricardo M., Martinez-Garcia, Sandra, Nicholson, David P., Richards, Kelvin J., Rii, Yoshimi M., Rouco, Monica, Viviani, Donn A., White, Angelicque E., Zehr, Jonathan P., and Karl, David M.

Abstract

Author Posting. © American Geophysical Union, 2015. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Global Biogeochemical Cycles 29 (2015): 1145–1164, doi:10.1002/2015GB005141., 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 extend the temporal resolution of these near-monthly time-series observations, an extensive field campaign was conducted during July–September 2012 at Station ALOHA with near-daily sampling of upper water-column biogeochemistry, phytoplankton abundance, and activity. The resulting data set provided biogeochemical measurements at high temporal resolution and documents two important events at Station ALOHA: (1) a prolonged period of low productivity when net community production in the mixed layer shifted to a net heterotrophic state and (2) detection of a distinct sea-surface salinity minimum feature which was prominent in the upper water column (0–50 m) for a period of approximately 30 days. The shipboard observations during July–September 2012 were supplemented with in situ measurements provided by Seagliders, profiling floats, and remote satellite observations that together revealed the extent of the low productivity and the sea-surface salinity minimum feature in the NPSG., NOAA Climate Observation Division; National Science Foundation (NSF) Center for Microbial Oceanography: Research and Education (C-MORE) Grant Numbers: EF0424599, OCE-1153656, OCE-1260164; Gordon and Betty Moore Foundation Marine Microbiology Investigator, 2016-02-13

Published
2015

26. Draft genome sequence of strain HIMB100, a cultured representative of the SAR116 clade of marine Alphaproteobacteria

Author

Saeck, Emily, Fernández-Gómez, Beatriz, Rii, Yoshimi M., Chen, Huan, Church, Matthew J., Widner, Brittany, Karl, David M., Hamisi, Mariam, Schutte, Charles, Carpintero de Moraes, Paula, D’Ambrosio, Lindsay, Rappé, Michael S., DeLong, Edward F., Grote, Jana, Logares, Ramiro, Bayindirli, Cansu, Edwards, Bethanie, Nguyen, Dan, Eppley, John M., Schuster, Stephan C., Bergauer, Kristin, Kyrpides, Nikos C., and Steward, Grieg F.

Abstract

Strain HIMB100 is a planktonic marine bacterium in the class Alphaproteobacteria. This strain is of interest because it is one of the first known isolates from a globally ubiquitous clade of marine bacteria known as SAR116 within the family Rhodospirillaceae. Here we describe preliminary features of the organism, together with the draft genome sequence and annotation. This is the second genome sequence of a member of the SAR116 clade. The 2,458,945 bp genome contains 2,334 protein-coding and 42 RNA genes.

Published
2011
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27. Draft genome sequence of strain HIMB100, a cultured representative of the SAR116 clade of marine Alphaproteobacteria

Author

Massachusetts Institute of Technology. Department of Civil and Environmental Engineering, DeLong, Edward, Eppley, John Marmaduke, Grote, Jana, Bayindirli, Cansu, Bergauer, Kristin, Carpintero de Moraes, Paula, Chen, Huan, D’Ambrosio, Lindsay, Edwards, Bethanie, Fernandez-Gomez, Beatriz, Hamisi, Mariam, Logares, Ramiro, Nguyen, Dan, Rii, Yoshimi M., Saeck, Emily, Schutte, Charles, Widner, Brittany, Church, Matthew J., Steward, Grieg F., Karl, David M., Schuster, Stephan C., Kyrpides, Nikos C., Rappe, Michael S., Massachusetts Institute of Technology. Department of Civil and Environmental Engineering, DeLong, Edward, Eppley, John Marmaduke, Grote, Jana, Bayindirli, Cansu, Bergauer, Kristin, Carpintero de Moraes, Paula, Chen, Huan, D’Ambrosio, Lindsay, Edwards, Bethanie, Fernandez-Gomez, Beatriz, Hamisi, Mariam, Logares, Ramiro, Nguyen, Dan, Rii, Yoshimi M., Saeck, Emily, Schutte, Charles, Widner, Brittany, Church, Matthew J., Steward, Grieg F., Karl, David M., Schuster, Stephan C., Kyrpides, Nikos C., and Rappe, Michael S.

Abstract

Strain HIMB100 is a planktonic marine bacterium in the class Alphaproteobacteria. This strain is of interest because it is one of the first known isolates from a globally ubiquitous clade of marine bacteria known as SAR116 within the family Rhodospirillaceae. Here we describe preliminary features of the organism, together with the draft genome sequence and annotation. This is the second genome sequence of a member of the SAR116 clade. The 2,458,945 bp genome contains 2,334 protein-coding and 42 RNA genes., Gordon and Betty Moore Foundation, National Science Foundation (U.S.) (Science and Technology Center (award No. EF0424599)), Center for Microbial Oceanography: Research and Education, University of Hawaii at Manoa. School of Ocean and Earth Science and Technology

Published
2013

29. Draft genome sequence of strain HIMB100, a cultured representative of the SAR116 clade of marine Alphaproteobacteria

Author

Grote, Jana, primary, Bayindirli, Cansu, additional, Bergauer, Kristin, additional, Carpintero de Moraes, Paula, additional, Chen, Huan, additional, D’Ambrosio, Lindsay, additional, Edwards, Bethanie, additional, Fernández-Gómez, Beatriz, additional, Hamisi, Mariam, additional, Logares, Ramiro, additional, Nguyen, Dan, additional, Rii, Yoshimi M., additional, Saeck, Emily, additional, Schutte, Charles, additional, Widner, Brittany, additional, Church, Matthew J., additional, Steward, Grieg F., additional, Karl, David M., additional, DeLong, Edward F., additional, Eppley, John M., additional, Schuster, Stephan C., additional, Kyrpides, Nikos C., additional, and Rappé, Michael S., additional

Published
2011
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37. THE YOUNG SCIENTIST AND THE SEA (OF MICROBES).

Author

BRUNO, BARBARA C., RII, YOSHIMI M., ROBIDART, JULIE C., and VIVIANI, DONN A.

Subjects
MARINE microorganisms, PHOTOSYNTHESIS, CYANOBACTERIA, ALGAE, SYMBIOSIS
Abstract

THE OCEAN IS FULL OF MICROBES: SINGLE-CELLED ORGANISMS THAT ARE SO tiny they can only be seen with a microscope. Although microbes are all around us, many remain undiscovered or poorly understood. Our planet's most abundant photosynthesizer is a marine microbe (a cyanobacterium) that was only discovered 25 years ago (Chisholm et al. 1988). Just last year, scientists learned that another cyanobacterium can team up with an algal cell: the cyanobacterium produces fertilizer for the algae and the algae provides food in return (Thompson et al. 2012). The symbiosis caused the cyanobacterium to evolve to have a smaller genome and lose its capacity for photosynthesis. These discoveries make one wonder: just how many kinds of microbes, and how many different functions and adaptations, remain undiscovered in the ocean? [ABSTRACT FROM AUTHOR]

Published
2013

38. The transient oasis : consequences of spatial and temporal variability in macronutrients and photosynthetic pigments on particle export in Hawaiian lee cyclones

Author

Rii, Yoshimi M.

Subjects
Eddies -- Hawaii, Eddies -- North Pacific Ocean, Cyclones -- Hawaii, Cyclones -- North Pacific Ocean
Abstract

Two cyclonic eddies were surveyed during the E-Flux I and III cruises in order to investigate the consequences of spatial and temporal variability in macronutrients and photosynthetic pigments on particle export. Cyclone Noah, a ~2.5-month-old eddy in the . 'decay' stage that was sampled during E-Flux I, exhibited modest increases in macronutrients and photosynthetic pigments at the center of the eddy. Cyclone Opal, sampled during E-Flux III and in the 'mature' stage at ~1 month old, exhibited sharp increases in macronutrient concentrations at the center of the eddy concurrent with a dramatic 2-fold increase in total chlorophyll a (TChl a) concentration in the deep chlorophyll maximum layer (DCML), comprised mainly of large diatoms. However, euphotic zone depth-integrated TChl a concentration for both eddies were indistinguishable between the center of the eddy and surrounding waters. During an eight-day time-series in the center of Opal, TChl a concentration in the DCML decreased by ~50% with a simultaneous decrease in diatom biomass, potentially triggered by silicic acid limitation. Despite the large diatom bloom, cyclone Opal did not produce the expected increase in particulate carbon and nitrogen export but a ~4-fold increase in silica export. This study represents a direct observation of two eddies at different stages in their biological life cycle, which is controlled by various factors on multiple time scales. Results suggest that controls on the life cycle of a Hawaiian lee cyclone are likely a combination of physical (eddy dynamics), chemical (nutrient limitation), and biological (growth and grazing imbalance) processes. Further investigation of recently studied cyclones in comparison with cyclones Noah and Opal yields speculation of a relationship with the spin-up duration of a cyclone and the resulting biological response. As Hawaiian lee cyclonic eddies may influence an area 100's of km in diameter in the subtropical North Pacific Ocean, it is clear from this study that variability in Hawaiian lee cyclones still remains an enigma.

Published
2006

39. Physical dynamics and biological implications of Cyclone Noah in the lee of Hawai’i during E-Flux I

Author

Kuwahara, Victor S., Nencioli, Francesco, Dickey, Tommy D., Rii, Yoshimi M., and Bidigare, Robert R.

Subjects
*CYCLONES, *SYNOPTIC climatology, *INTERDISCIPLINARY education, *EDDIES
Abstract

Abstract: Quasi-synoptic observations of the horizontal and vertical structure of a cold-core cyclonic mesoscale eddy feature (Cyclone Noah) were conducted in the lee of Hawai’i from November 4–22, 2004 as part of the E-Flux interdisciplinary collaborative research program. Cyclone Noah appears to have spun up to the southwest of the ‘Alenuihaha Channel (between Maui and Hawai’i) as a result of strong and persistent northeasterly trade winds through the channel. Shipboard hydrographic surveys 2.5 months later suggest that Noah weakened and was in a hypothesized spin-down phase of its life cycle. Although the initial surface expression of Noah was limited in scale to ∼40km in diameter and, as evidenced by surface temperatures, 2–3°C cooler than the surrounding waters, depth profiles revealed a fully developed semi-elliptical shallow feature (∼200m), ∼144km long and ∼90km wide (based on sigma-t=23kgm−3) with tangential speeds of 40–80cms−1, and substantial isopycnal doming. Potential vorticity distribution of Noah suggests that radial horizontal flow of the core water was inhibited from the surface to depths of ∼75m, with high vorticity confined above the sigma-t=23.5kgm−3 isopycnal surface. Upward displacements of isopycnal surfaces in the eddy''s center (∼50m) were congruent with enhanced pigment concentrations (0.50mgm−3). Comparisons of the results obtained for E-Flux I (Noah) and E-Flux III (Opal) suggest that translation characteristics of cyclonic Hawaiian lee eddies may be important in establishing the biogeochemical and biological responses of the oligotrophic ocean to cyclonic eddies. [Copyright &y& Elsevier]

Published
2008
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