المؤلفون: Valeria A. Guinder, Urban Tillmann, Bernd Krock, Ana L. Delgado, Torben Krohn, John E. Garzón Cardona, Katja Metfies, Celeste López Abbate, Ricardo Silva, Rubén Lara

المصدر: Frontiers in Marine Science, Vol 5 (2018)

مصطلحات موضوعية: protists’ plankton, functional groups, shelf front, phycotoxins, Alexandrium ostenfeldii, novel spirolides, Science, General. Including nature conservation, geographical distribution, QH1-199.5

الوصف: The extensive Argentine continental shelf supports high plankton productivity and fish catches. In particular, El Rincón coastal area and the adjacent shelf fronts (38.5–42°S, 58.5–62°W) comprise diverse habitats and hold species of economic and ecological value. So far, studies of the microbial community present at the base of the food web remain scarce. Here, we describe the late winter plankton (5–200 μm) structure in terms of abundance, biomass, species composition, functional groups, and phycotoxin profiles in surface waters of El Rincón in September 2015. Diatoms are the most abundant and the largest contributors to carbon biomass at most stations. They dominated the coastal and inner-shelf (depths 20 μm) heterotrophic protists such as various ciliates and dinoflagellates species were more abundant offshore. Scanning of phycotoxins disclosed that paralytic shellfish poisoning (PSP) toxins were dominated by gonyautoxins-1/4 (GTX1/4), whereas lipophilic toxins were detected in low abundance, for example, domoic acid (DA). However, a bloom of Pseudo-nitzschia spp. (up to 3.6 × 105 cells L-1) was detected at inner-shelf stations. Pectenotoxin-2 (PTX-2) and 13-desmethyl spirolide C (SPX-1) were the most abundant in the field. The PTX-2 co-occurred with Dinophysis spp., mainly D. tripos, while SPX-1 dominated at middle-shelf stations, where cells of Alexandrium catenella (1 strain) and A. ostenfeldii (3 strains) were isolated. The quantitative PSP profiles of the Alexandrium strains differed significantly from the in situ profiles. Moreover, the three A. ostenfeldii strains produced PSP and additionally, five novel spirolides. Phylogenetic analyses of these newly isolated strains from the South Atlantic revealed a new ribotype group, suggesting a biogeographical distinction in the population. The plankton survey presented here contributes baseline knowledge to evaluate potential ecosystem changes and track the global distribution of toxigenic species.

وصف الملف: electronic resource

العلاقة: https://www.frontiersin.org/article/10.3389/fmars.2018.00394/fullTest; https://doaj.org/toc/2296-7745Test

الوصول الحر: https://doaj.org/article/bf0f17efab804b30a4aa703f61032df3Test

المؤلفون: Valeria A. Guinder, M. Celeste López-Abbate, Anabela A. Berasategui, Vanesa L. Negrin, Georgina Zapperi, Paula D. Pratolongo, Melisa D. Fernández Severini, Cecilia A. Popovich

المصدر: Oceanologia, Vol 57, Iss 1, Pp 50-60 (2015)

مصطلحات موضوعية: Phytoplankton bloom, Sediment trap, Resuspension, Benthic-pelagic interactions, Shallow estuary, Oceanography, GC1-1581

الوصف: The development of the phytoplankton winter bloom and the accumulation of particulate suspended matter (PSM) inside sediment collectors were assessed in the inner zone of the Bahía Blanca Estuary. The phytoplankton bloom (chlorophyll up to 25 μg l−1 and abundance up to 8 × 106 cells l−1) was related with high levels of dissolved inorganic nutrients and underwater light availability (Im up to 355 μE m−2 s−1) and was dominated by relatively small diatoms, e.g. Chaetoceros sp.1 (3–8 μm). Conversely, large planktonic diatoms, mostly Thalassiosira spp. 20–60 μm, were found in the accumulated material inside the collectors, together with benthic microalgae and high concentrations of chlorophyll, phaeopigments, particulate organic matter (POM between 18 and 32% of total PSM) and C:N ratios >12. The composition of the settled material indicated vertical exportation of phytoplankton to the benthos, external loads of detritus and bottom resuspension. The present study highlights the close benthic‐pelagic interactions in shallow coastal environments characterized by high productivity.

وصف الملف: electronic resource

العلاقة: http://www.sciencedirect.com/science/article/pii/S0078323414000128Test; https://doaj.org/toc/0078-3234Test

الوصول الحر: https://doaj.org/article/ee6bdeffc2ab4c229793ac05fa17bf4bTest

المؤلفون: Valeria A. Guinder, Cecilia A. Popovich, Gerardo M. E. Perillo

المصدر: Brazilian Journal of Oceanography, Vol 57, Iss 3, Pp 249-258 (2009)

مصطلحات موضوعية: Oceanography, GC1-1581

وصف الملف: electronic resource

العلاقة: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-87592009000300008Test; https://doaj.org/toc/1679-8759Test; https://doaj.org/toc/1982-436XTest

الوصول الحر: https://doaj.org/article/950ea36b25ca4d1d901f77b3949fe662Test

المؤلفون: Valeria A Guinder, Andrea Malits, Carola Ferronato, Bernd Krock, John Garzón-Cardona, Ana Martínez

المصدر: PLoS ONE, Vol 15, Iss 5, p e0233156 (2020)

مصطلحات موضوعية: Medicine, Science

الوصف: Marine microbial plankton hold high structural and functional diversity, however, high-resolution data are lacking in a large part of the Global Ocean, such as in subpolar areas of the SW Atlantic. The Burdwood Bank (BB) is a submerged plateau (average depth 100 m) that constitutes the westernmost segment of the North Scotia Ridge (54°-55°S; 56°-62°W). The BB hosts rich benthic biodiversity in low chlorophyll waters of the southern Patagonian Shelf, Argentina, declared Namuncurá Marine Protected Area (NMPA) in 2013. So far, the pelagic microorganisms above the bank have not been described. During austral summer 2016, we assessed the microbial plankton (0.2-200 μm cell size) biomass and their taxonomical and functional diversity along a longitudinal transect (54.2-55.3°S, 58-68°W) from the Beagle Channel (BC) to the BB, characterized by contrasting hydrography. Results displayed a marked zonation in the composition and structure of the microbial communities. The biomass of phytoplankton >5 μm was 28 times higher in the BC, attributed mainly to large diatom blooms, than in oceanic waters above the BB, where the small coccolithophore Emiliania huxleyi and flagellates 5 μm, emphasizing the importance of small-sized phytoplankton in low chlorophyll waters. The homogeneous water column and high retention above the bank seem to favor the development of abundant picophytoplankton and microzooplankton communities. Overall, our findings unfold the plankton configuration in the Southern Patagonian Shelf, ascribed as a sink for anthropogenic CO2, and highlight the diverse ecological traits that microorganisms develop to adjust their yield to changing conditions.

وصف الملف: electronic resource

العلاقة: https://doaj.org/toc/1932-6203Test

الوصول الحر: https://doaj.org/article/02d8bc29ffc94474a05bccb17bf2eb57Test

المؤلفون: Virginie Duvat, Matthias Garschagen, Alexandre K. Magnan, Valeria A. Guinder, Hans-Otto Pörtner, Zinta Zommers, Jean-Pierre Gattuso, Ove Hoegh-Guldberg

المساهمون: Institut du Développement Durable et des Relations Internationales (IDDRI), Institut d'Études Politiques [IEP] - Paris, Alfred Wegener Institute, Bremerhaven, LIttoral ENvironnement et Sociétés - UMRi 7266 (LIENSs), Université de La Rochelle (ULR)-Centre National de la Recherche Scientifique (CNRS)

المصدر: Nature Climate Change
Nature Climate Change, Nature Publishing Group, 2021, ⟨10.1038/s41558-021-01156-w⟩
Nature Climate Change, Nature Publishing Group, 2021

مصطلحات موضوعية: 0303 health sciences, Framingham Risk Score, 010504 meteorology & atmospheric sciences, Natural resource economics, Climate risk, [SDE.MCG]Environmental Sciences/Global Changes, Global warming, Climate change, [SHS.GEO]Humanities and Social Sciences/Geography, Environmental Science (miscellaneous), 01 natural sciences, [SDE.ES]Environmental Sciences/Environmental and Society, Residual risk, 03 medical and health sciences, 13. Climate action, Greenhouse gas, 11. Sustainability, Environmental science, Risk assessment, Social Sciences (miscellaneous), Global risk, ComputingMilieux_MISCELLANEOUS, 030304 developmental biology, 0105 earth and related environmental sciences

الوصف: The three recent Special Reports of the IPCC provide an opportunity to understand overarching climate risk, as they cover a wide diversity of risks to natural and human systems. Here we develop a scoring system to translate qualitative IPCC risk assessments into risk scores that, when aggregated, describe global risk from climate change. By the end of this century, global climate risk will increase substantially with greenhouse gas emissions compared to today (composite risk score increase of two- and fourfold under RCP2.6 and RCP8.5, respectively). Comparison of risk levels under +1.5 degrees C and +2 degrees C suggests that every additional 0.5 degrees C of global warming will contribute to higher risk globally (by about a third). Societal adaptation has the potential to decrease global climate risk substantially (by about half) under all RCPs, but cannot fully prevent residual risks from increasing (by one-third under RCP2.6 and doubling under RCP8.5, compared to today).Different frameworks, most notably expert assessments from the IPCC, have been developed to determine risk from climate change over this century. Estimated risk scores quantified from the IPCC assessments show a substantial increase in global composite risk by 2100 for low and high emissions.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e1fedc70e54a78561444b94deade2fb3Test
https://hal.archives-ouvertes.fr/hal-03432572Test

المؤلفون: Marc Gottschling, Kirsty F. Smith, Bernd Krock, Urban Tillmann, Valeria A. Guinder

المصدر: Harmful Algae. 84:244-260

مصطلحات موضوعية: 0106 biological sciences, ved/biology.organism_classification_rank.species, Zoology, Plant Science, 010501 environmental sciences, Aquatic Science, Azadinium spinosum, Ribotyping, 01 natural sciences, Abundance (ecology), medicine, Humans, 14. Life underwater, Stratum spinosum, 0105 earth and related environmental sciences, biology, Norway, ved/biology, 010604 marine biology & hydrobiology, Plankton, Spring bloom, Ribosomal RNA, biology.organism_classification, medicine.disease, Shellfish poisoning, Dinoflagellida, Dinophyceae

الوصف: Azaspiracids (AZA) are the most recently discovered group of lipophilic marine biotoxins of microalgal origin, and associated with human incidents of shellfish poisoning. They are produced by a few species of Amphidomataceae, but diversity and occurrence of the small-sized dinophytes remain poorly explored for many regions of the world. In order to analyze the presence and importance of Amphidomataceae in a highly productive area of Argentinean coastal waters (El Rincon area, SW Atlantic), a scientific cruise was performed in 2015 to sample the early spring bloom. In a multi-method approach, light microscopy was combined with real-time PCR molecular detection of Amphidomataceae, with chemical analysis of AZA, and with the establishment and characterization of amphidomatacean strains. Both light microscopy and PCR revealed that Amphidomataceae were widely present in spring plankton communities along the El Rincon area. They were particularly abundant offshore at the shelf front, reaching peak densities of 2.8 × 105 cells L−1, but no AZA were detected in field samples. In total, 31 new strains were determined as Az. dalianense and Az. spinosum, respectively. All Az. dalianense were non-toxigenic and shared the same rRNA sequences. The large majority of the new Az. spinosum strains revealed for the first time the presence of a non-toxigenic ribotype of this species, which is otherwise the most important AZA producer in European waters. One of the new Az. spinosum strains, with a particular slender shape and some other morphological peculiarities, clustered with toxigenic strains of Az. spinosum from Norway and, exceptionally for the species, produced only AZA-2 but not AZA-1. Results indicate a wide diversity within Az. spinosum, both in terms of sequence data and toxin profiles, which also will affect the qualitative and quantitative performance of the specific qPCR assay for this species. Overall, the new data provide a more differentiated perspective of diversity, toxin productivity and occurrence of Amphidomataceae in a poorly explored region of the global ocean.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::eaea05a8f0aef02f6e260a5a2accebc9Test
https://doi.org/10.1016/j.hal.2019.01.008Test

المؤلفون: Valeria A. Guinder, Phillip Williamson

مصطلحات موضوعية: geography, Oceanography, geography.geographical_feature_category, Benthos, Global warming, Climate change, Environmental science, Marine ecosystem, Ecosystem, Pelagic zone, Coral reef, Plankton

الوصف: The impacts of anthropogenic climate change are already discernible throughout the ocean, from the equator to the poles, and from the surface to abyssal depths. Further climate change impacts are inevitable; however, their damage to marine organisms and ecosystems, and the services they provide, can be greatly reduced if greenhouse gas emissions are rapidly reduced. This review covers six main climate-related drivers (warming, acidification, deoxygenation, sea level rise and storm events, sea ice loss, stratification, and nutrient supply) and their impacts on 13 marine ecosystems, broadly defined. Seven of these are near-shore (coral reefs, kelp ecosystems, seagrass meadows, rocky and sandy intertidal, saltmarshes, estuaries, and mangroves) and six are in shelf seas and the open ocean (shelf sea benthos, upper ocean plankton, fish and fisheries, cold water corals, ice-influenced ecosystems, and the deep seafloor). Three cross-cutting issues are emphasized: that climate change impacts are not single factors, but interact together and with other human pressures in a multistressor context; that there are fast and slow climate processes in the ocean, with overall temporal uncertainties relating to future societal behavior; and that there can be high spatial heterogeneity in marine ecosystem impacts and vulnerabilities.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::4767239386a6a994bcba52830d461627Test
https://doi.org/10.1016/b978-0-12-822373-4.00024-0Test

المؤلفون: N.K. Binu, Daniel G. Boyce, Andrea Bryndum-Buchholz, Raktima Dey, Julie L. Drolet, Tobias Emilsson, Florence Etienne, Valeria A. Guinder, Rhosanna Jenkins, Thandi F. Khumalo, Yuka Kobayashi, Adam D. Krauss, Rajesh S. Kumar, Bishwajit Kundu, Shilpi Kundu, Trevor M. Letcher, Sophie C. Lewis, Heike K. Lotze, Daniel P. Loucks, Stanley Maloy, John F. McEldowney, Kian Mintz-Woo, David Mond, Jane O’Sullivan, Jeff Price, Juliana Reu Junqueira, Elisabeth Lio Rosvold, S. Santamaria-Aguilar, Heike Schroeder, Silvia Serrao-Neumann, Maria Shahgedanova, M. Shaji, A.T. Vafeidis, Steve Vanderheiden, Rachel Warren, Iain White, Phillip Williamson, C. Wolff, Haorui Wu

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::e163ef34101657eb4435f9085e0af078Test
https://doi.org/10.1016/b978-0-12-822373-4.09991-2Test

المؤلفون: Valeria A. Guinder, M. Sofía Dutto, Celeste López-Abbate, Anabela A. Berasategui

المصدر: The Bahía Blanca Estuary ISBN: 9783030664855

مصطلحات موضوعية: geography, geography.geographical_feature_category, Environmental change, Habitat, Ecology, fungi, Phytoplankton, Biodiversity, Species diversity, Environmental science, Estuary, Plankton, Spatial heterogeneity

الوصف: The Bahia Blanca Estuary encompasses an extensive flat area covered by islands, saltmarshes, mudflats, and tidal channels. This spatial heterogeneity confers to the ecosystem the capacity to hold large biodiversity; in particular, the estuary is an important habitat for numerous permanent and migratory species of commercial and ecological importance, including fishes, birds, invertebrates, and mammals. Due to its interconnection with land, large gradients of salinity, nutrients, organic carbon, and turbidity characterize the inner part of the estuary where plankton has developed eco-physiological adaptations to sustain natural populations. In addition, urban and industrial settlements within this area pose additional threats to plankton communities. In recent years, however, specific plankton groups have revealed profound changes, denoting that the present rate of environmental change is exceeding the adaptive capacity of organisms. This chapter provides a comprehensive long-term examination of the main planktonic groups (phytoplankton, microzooplankton, mesozooplankton, and jellyfish), their species diversity, and temporal and spatial dynamics. This section further examines the ecological adaptations of plankton to survive under wide environmental gradients and identifies main biological shifts, including the introduction of invasive species, species replacement, low reproductive capacity, phenological changes, and the biomass decline of specific plankton groups in the last 40 years. Experimental and long-term field observations allowed the attribution of such changes to multiple interactive effects of environmental drivers, highlighting rising water turbidity and temperature, eutrophication, pollution, and expansion of exotic species as the main sustain drivers. The assessment of environmental variability and trend feedback provides the baseline to identify key plankton vulnerabilities and to delineate effective mitigation plans within the Bahia Blanca Estuary.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::163e3dc6c8624e12097cf07a3fb0ad31Test
https://doi.org/10.1007/978-3-030-66486-2_5Test

المؤلفون: Valeria A. Guinder, Maria Paz Chidichimo, Celeste López-Abbate, Carola Ferronato, Martín Raúl Amodeo

المصدر: Food Webs. 29:e00211

مصطلحات موضوعية: education.field_of_study, Biomass (ecology), Ecology, biology, Population, Plankton, biology.organism_classification, Oceanography, Engraulis, Productivity (ecology), Anchovy, Phytoplankton, Environmental science, Marine ecosystem, education, Ecology, Evolution, Behavior and Systematics

الوصف: In the southwestern Atlantic Shelf, in northern Patagonia, the coastal-inner shelf area of El Rincon (38°-41°S) is relevant due to retention processes and the occurrence of a mid-shelf front (MSF), which provide favorable habitat for the anchovy Engraulis anchoita, from which other commercial species feed on. Here, we assess the protistan plankton (>5 μm) composition and biomass during spring and summer of different years to explore the community structure at the base of the food web and its potential relation with the heterogenic spatial distribution of the anchovy's life stages previously reported in the literature. Our in situ data together with analyses of surface circulation patterns and satellite chlorophyll a denote a marked zonation of phytoplankton. We find that diatoms are the largest carbon contributors in the coastal sector and dinoflagellates near the MSF, where large copepods and mainly juveniles and adults of E. anchoita are found. In turn, transient small-scale eddies develop in the low chlorophyll central area dominated by nanoflagellates and ciliates, where small copepods and eggs and larvae of the anchovy dominate. Our results provide insights of the potential link between plankton assemblages, hydrological settings and developing stages of a highly exploited fish. Moreover, we contribute to biodiversity records used in global assessments of possible shifts at the population and community levels that might have cascading effects on marine ecosystems' productivity.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::448dbb6ae9ea993fbc280310c25bc5d2Test
https://doi.org/10.1016/j.fooweb.2021.e00211Test