Harmful algal blooms (HABs), dissolved organic matter (DOM), and planktonic microbial community dynamics at a near-shore and a harbour station influenced by upwelling (SW Iberian Peninsula)

Loureiro, Sofia; Reñé, Albert; Garcés, Esther; Camp, Jordi; Vaqué, Dolors

doi:10.1016/j.seares.2011.03.004

Cited by 32 publications

(50 citation statements)

References 44 publications

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“…Our observations on the functional gene content and protein expression are consistent with such a scavenging tactic. Bursts of nutrients also occur in the marine environment during algal blooms, (Loureiro et al, 2011) and some of newly colonizing sponge taxa, such as Pseudoalteromonas and Vibrio, are often associated with decaying matter and blooms (Kelly and Chistoserdov, 2001;Alderkamp et al, 2007).…”

Section: Metaproteomic Analysis Reveals Expression Changes Related Tomentioning

confidence: 99%

Marine microbial symbiosis heats up: the phylogenetic and functional response of a sponge holobiont to thermal stress

et al. 2013

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Large-scale mortality of marine invertebrates is a major global concern for ocean ecosystems and many sessile, reef-building animals, such as sponges and corals, are experiencing significant declines through temperature-induced disease and bleaching. The health and survival of marine invertebrates is often dependent on intimate symbiotic associations with complex microbial communities, yet we have a very limited understanding of the detailed biology and ecology of both the host and the symbiont community in response to environmental stressors, such as elevated seawater temperatures. Here, we use the ecologically important sponge Rhopaloeides odorabile as a model to explore the changes in symbiosis during the development of temperature-induced necrosis. Expression profiling of the sponge host was examined in conjunction with the phylogenetic and functional structure and the expression profile of the symbiont community. Elevated temperature causes an immediate stress response in both the host and symbiont community, including reduced expression of functions that mediate their partnership. Disruption to nutritional interdependence and molecular interactions during early heat stress further destabilizes the holobiont, ultimately leading to the loss of archetypal sponge symbionts and the introduction of new microorganisms that have functional and expression profiles consistent with a scavenging lifestyle, a lack virulence functions and a high growth rate. Previous models have postulated various mechanisms of mortality and disease in marine invertebrates. Our study suggests that interruption of symbiotic interactions is a major determinant for mortality in marine sessile invertebrates. High symbiont specialization and low functional redundancy, thus make these holobionts extremely vulnerable to environmental perturbations, including climate change.

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Section: Metaproteomic Analysis Reveals Expression Changes Related Tomentioning

confidence: 99%

Marine microbial symbiosis heats up: the phylogenetic and functional response of a sponge holobiont to thermal stress

et al. 2013

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“…The Sagres coast has a narrow continental shelf that descends rapidly to depths of over 1000 m at the continental slope. There are no permanent rivers [29], but the area is affected by coastal upwelling events because of its proximity to Cape Saint Vincent (CSV), at the intersection of the west and south coast of the Iberian Peninsula [30]. Generally, the upwelling filaments reach the area when the northerly winds promote upwelling along the west coast, with cold and nutrient upwelled waters flowing counter clockwise around the CSV, and eastwards along the southern coastal shelf [30][31][32].…”

Section: Study Areamentioning

confidence: 99%

“…Generally, the upwelling filaments reach the area when the northerly winds promote upwelling along the west coast, with cold and nutrient upwelled waters flowing counter clockwise around the CSV, and eastwards along the southern coastal shelf [30][31][32]. These events occur mostly during early spring to late summer, and are known to enhance and stimulate biological productivity of these waters [25,26,29,31].…”

Section: Study Areamentioning

confidence: 99%

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MERIS Phytoplankton Time Series Products from the SW Iberian Peninsula (Sagres) Using Seasonal-Trend Decomposition Based on Loess

et al. 2016

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Abstract:The European Space Agency has acquired 10 years of data on the temporal and spatial distribution of phytoplankton biomass from the MEdium Resolution Imaging Spectrometer (MERIS) sensor for ocean color. The phytoplankton biomass was estimated with the MERIS product Algal Pigment Index 1 (API 1). Seasonal-Trend decomposition of time series based on Loess (STL) identified the temporal variability of the dynamical features in the MERIS products for water leaving reflectance (ρ w (λ)) and API 1. The advantages of STL is that it can identify seasonal components changing over time, it is responsive to nonlinear trends, and it is robust in the presence of outliers. One of the novelties in this study is the development and the implementation of an automatic procedure, stl.fit(), that searches the best data modeling by varying the values of the smoothing parameters, and by selecting the model with the lowest error measure. This procedure was applied to 10 years of monthly time series from Sagres in the Southwestern Iberian Peninsula at three Stations, 2, 10 and 18 km from the shore. Decomposing the MERIS products into seasonal, trend and irregular components with stl.fit(), the ρ w (λ) indicated dominance of the seasonal and irregular components while API 1 was mainly dominated by the seasonal component, with an increasing effect from inshore to offshore. A comparison of the seasonal components between the ρ w (λ) and the API 1 product, showed that the variations decrease along this time period due to the changes in phytoplankton functional types. Furthermore, inter-annual seasonal variation for API 1 showed the influence of upwelling events and in which month of the year these occur at each of the three Sagres stations. The stl.fit() is a good tool for any remote sensing study of time series, particularly those addressing inter-annual variations. This procedure will be made available in R software.

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“…There are no discharges from permanent rivers, so freshwater inputs flow mainly from torrential streams produced by episodic incidents of heavy rain (Peliz and Fiúza, 1999). There have been studies on the dynamics of the local phytoplankton assemblages from Sagres, relative to upwelling and non-upwelling conditions (Loureiro et al, 2005a(Loureiro et al, , 2011 using microscopy and spectrophotometric techniques and, also, by the spectrophotometric determination of the absorption coefficients of phytoplankton and non-algal particles (Goela et al, 2013). This current study addresses three questions: a) How useful is CHEMTAX for the evaluation of phytoplankton communities compared to other techniques such as microscopy counts, spectrophotometric analysis of pigments, and determination of the spectral features of the community?…”

Section: Introductionmentioning

confidence: 99%

Using CHEMTAX to evaluate seasonal and interannual dynamics of the phytoplankton community off the South-west coast of Portugal

Goela

Danchenko

Icely

et al. 2014

Estuarine, Coastal and Shelf Science

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a b s t r a c t CHEMTAX was used to assess the relative contribution of the main phytoplankton classes to the total concentration of Chlorophyll a (Chl a) from the waters off SW coast of Portugal. Sampling campaigns were carried out during all seasons from 2008 to 2012, at three stations located 2, 10 and 18 km from the coast. Samples were taken from the surface, mid-Secchi and Secchi depth, for the determination of Chl a and other phytoplanktonic pigments by HPLC. Supporting data were also obtained including dissolved inorganic nutrients, salinity, transparency, temperature and upwelling indices. The CHEMTAX results were also related to microscopy counts and also spectral analysis of absorption of other samples from the same sampling campaigns. The pigment results showed that diatoms dominated from early spring to summer, coinciding with upwelling conditions, while cryptophytes, prymnesiophytes and prasinophytes dominated in autumn and winter, coinciding with seasonal stratification. Although the contribution of cyanobacteria to total Chl a was generally low, there were occasional sampling campaigns where it was exceptionally high, but these appeared not to be related to upwelling. Dinoflagellates and chrysophytes were minority groups although the pigment marker peridinin that was used to distinguish dinoflagellates was not adequate for distinguishing all the members of this group. CHEMTAX was particularly useful for discriminating between the smaller (0e20 mm) classes of the microplankton that could not be easily identified by microscopy.

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Harmful algal blooms (HABs), dissolved organic matter (DOM), and planktonic microbial community dynamics at a near-shore and a harbour station influenced by upwelling (SW Iberian Peninsula)

Cited by 32 publications

References 44 publications

Marine microbial symbiosis heats up: the phylogenetic and functional response of a sponge holobiont to thermal stress

Marine microbial symbiosis heats up: the phylogenetic and functional response of a sponge holobiont to thermal stress

MERIS Phytoplankton Time Series Products from the SW Iberian Peninsula (Sagres) Using Seasonal-Trend Decomposition Based on Loess

Using CHEMTAX to evaluate seasonal and interannual dynamics of the phytoplankton community off the South-west coast of Portugal

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