Boundary influences on HAB phytoplankton ecology in a stratification-enhanced upwelling shadow

Ryan, John P.; McManus, Margaret A.; Kudela, Raphael M.; Artigas, Mireia L.; Bellingham, James; Chávez, Francisco P.; Doucette, Gregory J.; Foley, Dave; Godin, M. A.; Harvey, Julio B.J.; Marin, Roman; Messié, Monique; Mikulski, Christina M.; Pennington, Timothy; Py, Frédéric; Rajan, Kanna; Shulman, Igor; Wang, Z.; Zhang, Y.

doi:10.1016/j.dsr2.2013.01.017

Cited by 58 publications

(37 citation statements)

References 65 publications

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“…Phytoplankton composition changed through the deployment, shifting between communities dominated by cyanobacteria, diatoms and dinoflagellates in a manner consistent with known responses to changing hydrography in the region (Ryan et al, 2014) (Figure 3). A Synechococcus-dominated phase from September 28 to 30 was characterized by low concentrations of chlorophyll (Chl a), DMSPp (particulate DMSP within phytoplankton cells) and DMSPd (dissolved DMSP in seawater) (Figure 3).…”

Section: Phytoplankton Dynamics In Monterey Baymentioning

confidence: 74%

Single-taxon field measurements of bacterial gene regulation controlling DMSP fate

et al. 2015

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The 'bacterial switch' is a proposed regulatory point in the global sulfur cycle that routes dimethylsulfoniopropionate (DMSP) to two fundamentally different fates in seawater through genes encoding either the cleavage or demethylation pathway, and affects the flux of volatile sulfur from ocean surface waters to the atmosphere. Yet which ecological or physiological factors might control the bacterial switch remains a topic of considerable debate. Here we report the first field observations of dynamic changes in expression of DMSP pathway genes by a single marine bacterial species in its natural environment. Detection of taxon-specific gene expression in Roseobacter species HTCC2255 during a month-long deployment of an autonomous ocean sensor in Monterey Bay, CA captured in situ regulation of the first gene in each DMSP pathway (dddP and dmdA) that corresponded with shifts in the taxonomy of the phytoplankton community. Expression of the demethylation pathway was relatively greater during a high-DMSP-producing dinoflagellate bloom, and expression of the cleavage pathway was greater in the presence of a mixed diatom and dinoflagellate community. These field data fit the prevailing hypothesis for bacterial DMSP gene regulation based on bacterial sulfur demand, but also suggest a modification involving oxidative stress response, evidenced as upregulation of catalase via katG, when DMSP is demethylated.

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Section: Phytoplankton Dynamics In Monterey Baymentioning

confidence: 74%

Single-taxon field measurements of bacterial gene regulation controlling DMSP fate

et al. 2015

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“…This signal indicates dense accumulations of phytoplankton near the surface [24]. Such dense "red tide" patches are most commonly observed during the warm, stratified fall season in this region of the bay [9,32,[35][36][37], and they have been linked to HAB effects [12]. Although at coarser spatial resolution, the MERIS satellite sensor also detected this distinct bloom patch in northern Monterey Bay on 26 October (Figure 8a).…”

Section: Fall 2011 Studymentioning

confidence: 96%

“…Warming and freshening of the upper water column occurred during the wind relaxation (Figure 2). This change in the physical environment is characteristic of wind relaxations [9,32] and consistent with the development of relatively quiescent conditions and a more stably stratified water column, with implications for response of the phytoplankton community to the preceding upwelling and associated nutrient supply. We examine physical and bio-optical patterns for this time to consider patchiness in phytoplankton bio-optical signal derived from HICO.…”

Section: Spring 2011 Studymentioning

confidence: 99%

“…An enhanced color HICO image from 27 April shows a whitish sediment plume originating from the coast north of the bay (not presented). Considering the potential transport of trace metals with sediments, this process has significant implications not only for phytoplankton productivity [27,28], but also for toxicity of toxigenic diatoms-as indicated by laboratory studies [29][30][31] and suggested from field studies [11,32]. The first HICO image of the spring series, on 25 April, was acquired following a brief (~3 day) wind relaxation that followed weeks of strong and persistent upwelling (Figure 2).…”

Section: Spring 2011 Studymentioning

confidence: 99%

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Application of the Hyperspectral Imager for the Coastal Ocean to Phytoplankton Ecology Studies in Monterey Bay, CA, USA

et al. 2014

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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 observations, to studies of phytoplankton ecology in a dynamic coastal upwelling environment-Monterey Bay, CA, USA. From a spring 2011 study, we examine HICO-detected spatial patterns in phytoplankton optical properties along an environmental gradient defined by upwelling flow patterns and along a temporal gradient of upwelling intensification. From a fall 2011 study, we use HICO's enhanced spatial and spectral resolution to distinguish a small-scale "red tide" bloom, and we examine bloom expansion and its supporting processes using other remote sensing and in situ data. From a spectacular HICO image of the Monterey Bay region acquired during fall of 2012, we present a suite of algorithm results for characterization of phytoplankton, and we examine the strengths, limitations, and distinctions of each algorithm in the context of the enhanced spatial and spectral resolution.

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“…More challenging than sampling larger organisms is applying these closed-loop approaches to smaller organisms as these targets are much more difficult to identify in real time. Novel and innovative AUV autonomy work has used proxy measures of the environment to improve the likelihood of sampling larval organisms and harmful algae in vertical layers and fronts [14,19,[34][35][36]. While clearly effective, this approach may produce false positives and must be locally tuned based on target species (i.e., Pseudo-nitzschia spp.).…”

Section: Discussionmentioning

confidence: 99%

Sensor Fusion and Autonomy as a Powerful Combination for Biological Assessment in the Marine Environment

Moline

Benoit‐Bird

2016

Robotics

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Abstract:The ocean environment and the physical and biological processes that govern dynamics are complex. Sampling the ocean to better understand these processes is difficult given the temporal and spatial domains and sampling tools available. Biological systems are especially difficult as organisms possess behavior, operate at horizontal scales smaller than traditional shipboard sampling allows, and are often disturbed by the sampling platforms themselves. Sensors that measure biological processes have also generally not kept pace with the development of physical counterparts as their requirements are as complex as the target organisms. Here, we attempt to address this challenge by advocating the need for sensor-platform combinations to integrate and process data in real-time and develop data products that are useful in increasing sampling efficiencies. Too often, the data of interest is only garnered after post-processing after a sampling effort and the opportunity to use that information to guide sampling is lost. Here we demonstrate a new autonomous platform, where data are collected, analyzed, and data products are output in real-time to inform autonomous decision-making. This integrated capability allows for enhanced and informed sampling towards improving our understanding of the marine environment.

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Boundary influences on HAB phytoplankton ecology in a stratification-enhanced upwelling shadow

Cited by 58 publications

References 65 publications

Single-taxon field measurements of bacterial gene regulation controlling DMSP fate

Single-taxon field measurements of bacterial gene regulation controlling DMSP fate

Application of the Hyperspectral Imager for the Coastal Ocean to Phytoplankton Ecology Studies in Monterey Bay, CA, USA

Sensor Fusion and Autonomy as a Powerful Combination for Biological Assessment in the Marine Environment

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