Frederico Brandini | Universidade de São Paulo (original) (raw)

Papers by Frederico Brandini

$Research paper thumbnail of Stable isotope fractionation of strontium in coccolithophore calcite: Influence of temperature and carbonate chemistry$

Geobiology, Feb 12, 2018

Coccolithophores are a unicellular marine phytoplankton group covered by minute calcite plates (c... more Coccolithophores are a unicellular marine phytoplankton group covered by minute calcite plates (coccoliths) and have been part of calcareous sediments since the Late Triassic (Bown, Lees, & Young, 2004). In the modern ocean, coccolithophores are the dominant producers of calcium carbonate in the pelagic realm and consequently occupy a key role in the biological carbon pump. The biogenic precipitation of calcium carbonate in coccolithophores takes place inside a special cellular compartment, the coccolith vesicle, which is derived from the Golgi-apparatus and separated by several biomembranes from seawater (Mackinder, Wheeler, Schroeder, Riebesell, & Brownlee, 2010). During the precipitation of calcite, the Ca ion can be substituted for other divalent cations, such as Sr and Mg. The partition coefficient

Deep-sea Research Part I-oceanographic Research Papers, Dec 1, 2021

À minha família. Esse trabalho só foi possível graças ao constante apoio e convicção da parte de ... more À minha família. Esse trabalho só foi possível graças ao constante apoio e convicção da parte de vocês. Tenho muita sorte de ter pessoas incríveis ao meu lado. Esse trabalho é dedicado a todos seus sacrifícios feitos e inabalável confiança depositada. Ao amigo e orientador Frederico P. Brandini. Obrigado pelas conversas, broncas, oportunidades e acima de tudo, pelos ensinamentos que tive ao longo dessa parceria. Esse documento é a realização de um sonho, que só foi possível graças à sua confiança no meu trabalho. Obrigado por sempre me incentivar a buscar novos desafios e a ser um profissional melhor. Aos amigos do IOUSP por transbordarem sua paixão por oceanografia. Agradeço todas as dicas, ajudas, preocupações e críticas que influenciaram no meu trabalho e formação. Em especial, agradeço aos técnicos e professores Camila Signori, Flávia

DOAJ (DOAJ: Directory of Open Access Journals), 1999

The biomass distribution and the cOníposition of the microplankton (I0-200llm) were investigated ... more The biomass distribution and the cOníposition of the microplankton (I0-200llm) were investigated along a transect between Southern Brazil (25°30'S) and Antarctic Peninsula (62°05'S) in November/1992. Biomass peaks were observed at Polar Front (PF) and Brazil-Malvinas Confluence Zone (BMCZ) (0.84-1.23 Ilg Chl.a/l). Adjacent waters showed low biomass indicating low productivity, with similar average values for Antarctic Water (0.18 Ilg/l) and Subtropical Water (0.27 Ilg/l), where a bloom of Trichodesmium erythraeum was detected. Subantarctic waters over the oceanic province around the Patagonian shelf represented a notable exception, with peaks in phytoplankton biomass (up to 2.46 Ilg Chl.a/l). Those areas of enhanced biomass were diatom-dominated; the Prymnesiophyceae Phaeocystis was abundant in some stations. Both fronts presented similar values of chlorophyll-a, indicating that environrnents with distinctive characteristics could support blooms of the same magnitude. Weakly silicified diatoms (Hemiaulus, Leptocylindrus, Thalassiosira) dominated to the north of the BMCZ, while heavily silicified species (Asteromphalus, Chaetoceros afL neglectus, Fragillariopsis kerguelensis, Proboscia, Pseudonitzschia sp., Rhizosolenia) formed the bulk of phytoplankton at the PF, reflecting the different chemical characteristics of the water masses. The diatoms occurring in the PF appear to be recurrent and widely distributed along different longitudes over the Antarctic Circumpolar Current. Ciliates and heterotrophic dinoflagellates were dominant at Subtropical Water and to the north ofBMCZ, and seemed to respond quickly to the increasing phytoplankton biomass.

Regional Studies in Marine Science, May 1, 2020

The pool of particulate organic matter driven by primary production in western boundary continent... more The pool of particulate organic matter driven by primary production in western boundary continental margins is known to be smaller than the highly eutrophic upwelling systems of eastern margins. Its production and export, however, can be high compared to productive ocean environments due to inherent specific physical dynamics such as mesoscale instabilities driven by the boundary current. To investigate how such physical process influence nutrients, chlorophyll-a and particulate matter on the outer shelf of the South Brazil Bight, two oceanographic cruises were conducted three months apart (November 2012 and January 2013), both under wind conditions that favor intrusions of South Atlantic Central Water (SACW). Our results showed two distinct hydrographic scenarios derived by the relative positions of oceanographic fronts in the outer shelf and shelf break region, associated with the Brazil Current (BC). In November 2012, the oligotrophic Tropical Water occupied a larger area of the continental shelf. Low nutrients and chlorophyll-a concentrations were found, typical of a regenerated production system. In contrast, maximum concentration of particulate matter and particulate inorganic carbon occurred at deeper layers in this period, together with low POC:PON ratio-probably from sediment resuspension. In January 2013, a strong shelf break upwelling was detected that enhanced SACW intrusion, notably increasing nutrient availability in the euphotic zone and the chlorophyll-a concentration at deeper layers. These deep chlorophyll maximum layers contribute to the production and accumulation of particulate organic carbon and nitrogen under these conditions. BC mesoscale instabilities appear to act as a particulate matter transport and export agent to the deep waters throughout the South Brazil Bight outer shelf.

Journal of Marine Systems, 2024

Marine Biodiversity, 2018

We surveyed the gelatinous zooplankton (Cnidaria, Ctenophora, Chaetognatha, Tunicata) fauna from ... more We surveyed the gelatinous zooplankton (Cnidaria, Ctenophora, Chaetognatha, Tunicata) fauna from the Cananeia-Iguape Coastal System (CICS; São Paulo, Brazil;~25°S). This area includes a natural reserve formed by the Atlantic Rain Forest and mangroves, having a high biological productivity and being recognized as a wildlife sanctuary. We analyzed 164 plankton samples collected between January 2012 and January 2013, along with visual records of living and stranded large (>2 cm) gelatinous zooplankton. More than 29,000 organisms were studied, which combined with literature totaled 16 orders, 40 families and 56 species: two cubomedusae, five scyphomedusae, two siphonophores, 34 hydromedusae, two ctenophores, five chaetognaths, three appendicularians and three thaliaceans. Twenty-seven species are new records for the CICS, six species for the state of São Paulo, and Tiaricodon sp. is newly recorded for the Brazilian coast and is described in details. Most of the species from CICS (37 spp.; 66%) are meroplanktonic, whereas the most abundant taxa are holoplanktonic (>95% of all gelatinous). Meroplanktonic taxa tended to be more species rich in brackish-waters (salinity 20-30) with most species occurring in one or two seasons, particularly during summer and/or autumn, while holoplanktonic species tended to occur throughout the year, and to be more species-rich in more saline waters (>30). These observations indicate different strategies of estuarine occupation driven by life cycle. Our results underscore the high diversity of meroplanktonic gelatinous organisms from subtropical estuaries and emphasize the need for comprehensive sampling surveys in such ecosystems, which are mostly understudied worldwide.

... Bonefish Fisheries Jerald S. Ault Methods in Reproductive Aquaculture: Marine and Freshwater ... more ... Bonefish Fisheries Jerald S. Ault Methods in Reproductive Aquaculture: Marine and Freshwater Species Elsa Cabrita, Vanesa Robles, and ... 187 Pablo Sanchez-Jerez, Damian Fernandez-Jover, Ingebrigt Uglem, Pablo Arechavala-Lopez, Tim Dempster, Just T. Bayle-Sempere ...

Journal of Plankton Research, 1999

Absolute abundances of foraminifers, polycystine and phaeodarian radiolarians, tintinnids, pterop... more Absolute abundances of foraminifers, polycystine and phaeodarian radiolarians, tintinnids, pteropods and early crustacean larvae and moults were assessed in a collection of 57 vertically stratified (0-100 m) net microplankton samples from 22 stations located between 34 and 58°S (along 51-56°W), covered on 8-16 November 1994. Tintinnids were identified to species and measured in order to estimate their biomass from biovolume to carbon conversions. The distribution of the microzooplanktonic groups assessed was irregular and patchy, both geographically and vertically, and their abundances were characteristic of oceanic low to medium productivity environments. Tintinnid biomass was also generally low (0.05-0.40 µg C l-1). With the exception of the tintinnids, associations between microzooplanktonic numbers and chlorophyll a were generally loose. Eighty-eight tintinnid taxa were recorded, yet only five accounted for 53% of the specimens identified. Multivariate (cluster) analysis of tintinnid specific distribution patterns clearly showed several distinct zones. From north to south, these are: Transition Zone (TZ), with three subzones, TZ north (34°S-38°S), TZ central (39°44ЈS-44°S) and TZ south (46°S); Subantarctic Zone (SZ; 48-55°S); Polar Front Zone (55°30ЈS); Antarctic Zone (AZ; 58-59°36ЈS). Each of these was characterized by distinct tintinnid assemblages, abundance and biomass. With few exceptions, tintinnid cells were fairly evenly distributed throughout the upper 50 m. Taxonomic composition usually changed little with depth. Mean population depths were calculated for a subset of 35 tintinnids; 29 of these dwell preferably above 40 m. The spatial distribution of tintinnid species richness showed a more or less gradual decrease from north to south. Specific diversity and equitability generally increased with depth, and were higher in antarctic waters than the southern transitional and subantarctic ones; this trend is tentatively attributed to higher water column vertical stability south of the Polar Front.

PeerJ, Nov 10, 2016

Pico and nanoplankton communities from the Southwest Atlantic Ocean along the Brazilian Bight are... more Pico and nanoplankton communities from the Southwest Atlantic Ocean along the Brazilian Bight are poorly described. The hydrography in this region is dominated by a complex system of layered water masses, which includes the warm and oligotrophic Tropical Water (TW), the cold and nutrient rich South Atlantic Central Water (SACW) and the Coastal Water (CW), which have highly variable properties. In order to assess how pico-and nanoplankton communities are distributed in these different water masses, we determined by flow cytometry the abundance of heterotrophic bacteria, Prochlorococcus, Synechococcus and autotrophic pico and nanoeukaryotes along three transects, extending from 23 • S to 31 • S and 39 • W to 49 • W. Heterotrophic bacteria (including archaea, maximum of 1.5 × 10 6 cells mL −1) were most abundant in Coastal and Tropical Water whereas Prochlorococcus was most abundant in open-ocean oligotrophic waters (maximum of 300 × 10 3 cells mL −1). Synechococcus (up to 81 × 10 3 cells mL −1), as well as autotrophic pico and nanoeukaryotes seemed to benefit from the influx of nutrient-rich waters near the continental slope. Autotrophic pico and nanoeukaryotes were also abundant in deep chlorophyll maximum (DCM) layers from offshore waters, and their highest abundances were 20 × 10 3 cells mL −1 and 5 × 10 3 cells mL −1 , respectively. These data are consistent with previous observations in other marine areas where Synechococcus and autotrophic eukaryotes dominate mesotrophic waters, whereas Prochlorococcus dominate in more oligotrophic areas. Regardless of the microbial community structure near the surface, the carbon stock dominance by autotrophic picoeukaryotes near the DCM is possibly linked to vertical mixing of oligotrophic surface waters with the nutrient-rich SACW and their tolerance to lower light levels.

The ISME Journal, Feb 9, 2018

Symbioses between eukaryotic algae and nitrogen-fixing cyanobacteria have been recognized in rece... more Symbioses between eukaryotic algae and nitrogen-fixing cyanobacteria have been recognized in recent years as a key source of new nitrogen in the oceans. We investigated the composition of the small photosynthetic eukaryote communities associated with nitrogen-fixing cyanobacteria in the Brazilian South Atlantic Bight using a combination of flow cytometry sorting and high throughput sequencing of two genes: the V4 region of 18S rRNA and nifH. Two distinct eukaryotic communities were often encountered, one dominated by the Mamiellophyceae Bathycoccus and Ostreococcus, and one dominated by a prymnesiophyte known to live in symbiosis with the UCYN-A1 nitrogen-fixing cyanobacterium. Among nifH sequences, those from UCYN-A1 were most abundant but three other UCYN-A clades (A2, A3, A4) were also found. Network analysis confirmed the relation between A1 and A2 clades and their hypothesized hosts and pointed out to the potential association between novel clade A4 with Braarudosphaera bigelowii, previously hypothesized to host A2.

Limnology and Oceanography-methods, Aug 8, 2016

For almost 3 decades, flow cytometry has allowed researchers to investigate ocean planktonic comm... more For almost 3 decades, flow cytometry has allowed researchers to investigate ocean planktonic communities using size and cell fluorescence properties. However, oceanographic applications must face two constraints. First, when dealing with marine microbes, instruments must be sensitive because these organisms are very small and with low fluorescence. Second, instruments must be portable to be used on board ships. We compared the performance of two instruments, the BD FACSCanto™ and BD Accuri™ C6. The former is an expensive laboratory-based instrument which has a very good sensitivity, whilst the latter is less sensitive but presents critical advantages for field studies (easy handling and transportation, relatively low cost). We have analyzed 102 samples from the South Atlantic Ocean from 3 transects off Brazil, within the euphotic zone. We compared cell abundance of heterotrophic bacteria, Prochlorococcus and Synechococcus, as well as photosynthetic pico-and nanoeukaryotes. Heterotrophic bacteria, pico-and nano-eukaryotes could be easily detected with both cytometers. Prochlorococcus and Synechococcus populations were severely underestimated with the BD Accuri™ C6, particularly for samples from the well-lit layers of the water column. Correction of abundance data using previously suggested approaches was not sufficient to fully compensate for the low sensibility. Our data suggest that the BD Accuri™ C6 is suitable for counting marine bacteria and photosynthetic eukaryotes, but not Prochlorococcus and Synechococcus. 488 135 210 478 100 80 77 71 212 56 56 475 41 36 i_max<-which.max(channel) # determine the maximum channel i_cell_max<-which.max(cell_smooth) # determine in which channel is the histogram mode # "no correction" : cell abundance in the first channel is 5 times lower than abundance at the maximum of the histogram if (cell_smooth[i_cell_max]>5*cell_smooth[i_min]) {cell_correct<-"no correction"}

In 1974, artificial reef researchers organized the first International Conference on the subject ... more In 1974, artificial reef researchers organized the first International Conference on the subject of 'Reefs'. The conference was held 20-22 March 1974 in Houston, Texas, USA '.. . to provide an international forum for the exchange of information, experiences and thoughts among persons involved with or interested in any aspect of artificial reef research, construction or use' (

Progress in Oceanography, Feb 1, 2022

Ocean and Coastal Research

Artificial reefs (ARs) have been deployed on the inner shelf of Paraná, Southeast Brazil, as prot... more Artificial reefs (ARs) have been deployed on the inner shelf of Paraná, Southeast Brazil, as protection against destructive trawling activities, and to offer habitat for local fauna for recovery of biodiversity. The purpose of this study was to develop a preliminary characterization of the ichthyoplankton community associated with both artificial and natural reefs in the Currais Archipelago, and perform a comparison of fish larvae composition between ARs and nearby unconsolidated substrate. Two sampling methods were used, light traps and a plankton net. A total of 12 families and 14 species were identified, expanding the total species list in the area by eight species and three families. Differences among assemblages on ARs and unconsolidated substrate indicate that ARs seem to be effective attractors to fish larvae. Particular attention is drawn in regard to the "attractor effect" for exotic species that do not naturally reside in the area, such as Omobranchus punctatus. The large abundance of fish eggs on ARs suggests that these artificial structures can improve local production. These results are the first step needed to better define guidelines for sustainable use and management of ARs and Currais Archipelago, a Marine National Park.