keyword
MENU ▼
Read by QxMD icon Read
search

dinoflagellate

keyword
https://www.readbyqxmd.com/read/28526199/impacts-of-metal-contamination-and-eutrophication-on-dinoflagellate-cyst-assemblages-along-the-guangdong-coast-of-southern-china
#1
Xinxin Lu, Zhaohui Wang, Xin Guo, Yangguang Gu, Weibiao Liang, Lei Liu
Fifty-one surface sediment samples were collected from eleven sea areas along the Guangdong coast in southern China. Biogenic elements, metals and dinoflagellate cysts were analyzed. Twenty-one cyst taxa in 12 genera were identified. The cyst concentrations ranged between 14 and 250 cysts/g, with an average of 69 cysts/g. The low cyst production was caused by coarse sediments, high sedimentation rates, and high anthropogenic disturbances. Biogenic elements were comparable with those reported. However, the metal concentrations were far lower than the sediment quality guidelines...
May 16, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28526122/uptake-of-dissolved-inorganic-and-organic-nitrogen-by-the-benthic-toxic-dinoflagellate-ostreopsis-cf-ovata
#2
Cécile Jauzein, Douglas Couet, Thierry Blasco, Rodolphe Lemée
Environmental factors that shape dynamics of benthic toxic blooms are largely unknown. In particular, for the toxic dinoflagellate Ostreopsis cf. ovata, the importance of the availability of nutrients and the contribution of the inorganic and organic pools to growth need to be quantified in marine coastal environments. The present study aimed at characterizing N-uptake of dissolved inorganic and organic sources by O. cf. ovata cells, using the (15)N-labelling technique. Experiments were conducted taking into account potential interactions between nutrient uptake systems as well as variations with the diel cycle...
May 2017: Harmful Algae
https://www.readbyqxmd.com/read/28526120/a-new-species-of-gambierdiscus-dinophyceae-from-the-south-west-pacific-gambierdiscus-honu-sp-nov
#3
Lesley Rhodes, Kirsty F Smith, Arjun Verma, Belinda G Curley, D Tim Harwood, Sam Murray, Gurjeet S Kohli, Dorothy Solomona, Teina Rongo, Rex Munday, Shauna A Murray
Two isolates of a new tropical, epiphytic dinoflagellate species, Gambierdiscus honu sp. nov., were obtained from macroalgae sampled in Rarotonga, Cook Islands, and from North Meyer Island, Kermadec Islands. Gambierdiscus honu sp. nov. had the common Gambierdiscus Kofoidian plate formula: Po, 3', 6″, 6C?, 6 or 7S, 5‴, 1p and 2⁗. The characteristic morphological features of this species were its relatively small short dorsoventral length and width and the shape of individual plates, in particular the combination of the hatchet-shaped 2' and pentagonal 3' plates and the length to width ratio of the antapical 1p plate...
May 2017: Harmful Algae
https://www.readbyqxmd.com/read/28526119/effects-of-temperature-salinity-and-composition-of-the-dinoflagellate-assemblage-on-the-growth-of-gambierdiscus-carpenteri-isolated-from-the-great-barrier-reef
#4
Leanne Sparrow, Paolo Momigliano, Garry R Russ, Kirsten Heimann
Increases in reported incidence of ciguatera fish poisoning (hereafter ciguatera) have been linked to warmer sea temperatures that are known to trigger coral bleaching events. The drivers that trigger blooms of ciguatera-causing dinoflagellates on the Great Barrier Reef (GBR) are poorly understood. This study investigated the effects of increased temperatures and lowered salinities, often associated with environmental disturbance events, on the population growth of two strains of the potentially ciguatera-causing dinoflagellate, Gambierdiscus carpenteri (NQAIF116 and NQAIF380)...
May 2017: Harmful Algae
https://www.readbyqxmd.com/read/28526116/allelopathic-interactions-between-the-macroalga-hizikia-fusiformis-harvey-and-the-harmful-blooms-forming-dinoflagellate-karenia-mikimotoi
#5
Zengling Ma, Mingjiang Wu, Lidong Lin, Ronald W Thring, Hengguo Yu, Xu Zhang, Min Zhao
The effects of algal blooms on seaweeds have been rarely studied, although harmful algal blooms (HABs) are now normally regarded as worldwide incidents. In the present study, the effects of dense Karenia mikimotoi cells on the growth and photosynthesis of Hizikia fusiformis, a common and commercially cultivated macroalga in coastal waters of the East China Sea (ECS), were studied to understand the possible consequences when the mariculture encountered a dense harmful algal bloom. Furthermore, the counteraction of the latter on the growth and photosynthetic activities of K...
May 2017: Harmful Algae
https://www.readbyqxmd.com/read/28526115/different-life-cycle-strategies-of-the-dinoflagellates-fragilidium-duplocampanaeforme-and-its-prey-dinophysis-acuminata-may-explain-their-different-susceptibilities-to-the-infection-by-the-parasite-parvilucifera-infectans
#6
Bora Lee, Myung Gil Park
Some marine dinoflagellates form ecdysal cyst (=temporary cysts) as part of their life cycle or under unfavorable growth conditions. Whether the dinoflagellates form ecdysal cysts or not may influence susceptibility to parasitism. In this study, parasite prevalence relative to inoculum size of the parasitoid Parvilucifera infectans zoospores for two dinoflagellate hosts (i.e., Fragilidium duplocampanaeforme and Dinophysis acuminata), which have different life cycle strategies, was examined. Further, susceptibility of cysts to parasitism, encystment signal, duration of encystments, and effects of induced encystment on diel periodicity, using ecdysal cyst-forming F...
May 2017: Harmful Algae
https://www.readbyqxmd.com/read/28510705/crystal-structure-of-octocoral-lectin-sll-2-complexed-with-forssman-antigen-tetrasaccharide
#7
Akiko Kita, Mitsuru Jimbo, Ryuichi Sakai, Yukio Morimoto, Ryota Takeuchi, Hiroshi Tanaka, Takashi Takahashi, Kunio Miki
A symbiosis-related lectin, SLL-2, from the octocoral Sinularia lochmodes, distributes densely on the cell surface of microalgae, Symbiodinium sp., an endosymbiotic dinoflagellate of the coral, and is also shown to be a chemical cue that transforms dinoflagellates into a non-motile (coccoid) symbiotic state. SLL-2 binds to the sugar chain of the molecule similar to Forssman antigen pentasaccharide (GalNAcα1-3GalNAcβ1-3 Galα1-4 Galβ1-4Glc) on the surface of microalgae with high affinity. Here we report the crystal structure of the complex between SLL-2 and Forssman antigen tetrasaccharide (GalNAcα1-3GalNAcβ1-3 Galα1-4 Galβ) at 3...
May 16, 2017: Glycobiology
https://www.readbyqxmd.com/read/28509342/morphological-and-molecular-characterization-of-bysmatrum-subsalsum-dinophyceae-from-the-western-mediterranean-sea-reveals-the-existence-of-cryptic-species
#8
Sílvia Anglès, Albert Reñé, Esther Garcés, Antonella Lugliè, Nicola Sechi, Jordi Camp, Cecilia Teodora Satta
Bysmatrum subsalsum is a cosmopolitan dinoflagellate species that inhabits marine and transitional habitats. Despite its wide distribution, information on the morphological variability, phylogeny and ecology of B. subsalsum is scarce. In this study, we provide morphological and molecular data on B. subsalsum strains and wild cells from different locations in the Mediterranean Basin. The dynamics of cell abundances and the associated environmental conditions during a field bloom are also described. Genetic sequences of B...
May 16, 2017: Journal of Phycology
https://www.readbyqxmd.com/read/28505508/phosphatase-activities-of-a-microepiphytic-community-during-a-bloom-of-ostreopsis-cf-ovata-in-the-northern-adriatic-sea
#9
Stefano Accoroni, Cecilia Totti, Emanuela Razza, Roberta Congestri, Alessandra Campanelli, Mauro Marini, Neil Thomas William Ellwood
It is becoming more apparent that increased organic nutrient loads deriving from anthropogenic activities and natural processes frequently cause the eutrophication of coastal waters. Concurrently, an increasing number of phototrophs have been shown to make use of organic nutrients, mainly through indirect studies of surface enzyme activities or through direct studies of growth in media containing organic-only nutrients. The potential utilization of dissolved organic phosphorus (DOP) by microepiphytic-mats associated with frequently problematic, toxic dinoflagellate Ostreopsis cf...
May 8, 2017: Water Research
https://www.readbyqxmd.com/read/28493958/evolutionary-transition-towards-permanent-chloroplasts-division-of-kleptochloroplasts-in-starved-cells-of-two-species-of-dinophysis-dinophyceae
#10
Pernille Møller Rusterholz, Per Juel Hansen, Niels Daugbjerg
Species within the marine toxic dinoflagellate genus Dinophysis are phagotrophic organisms that exploit chloroplasts (kleptochloroplasts) from other protists to perform photosynthesis. Dinophysis spp. acquire the kleptochloroplasts from the ciliate Mesodinium rubrum, which in turn acquires the chloroplasts from a unique clade of cryptophytes. Dinophysis spp. digest the prey nuclei and all other cell organelles upon ingestion (except the kleptochloroplasts) and they are therefore believed to constantly acquire new chloroplasts as the populations grow...
2017: PloS One
https://www.readbyqxmd.com/read/28492174/hematodinium-spp-infections-in-wild-and-cultured-populations-of-marine-crustaceans-along-the-coast-of-china
#11
Jin-Feng Wang, Meng Li, Jie Xiao, Wen-Jun Xu, Cai-Wen Li
The parasitic dinoflagellate Hematodinium spp. infects a broad range of marine crustaceans. Its epidemics have impacted wild populations of various commercial fishery species around the world and the sustainability of mariculture in China. To study the epidemiology of Hematodinium spp. in marine crustaceans along the coast of China, we conducted a broad survey of wild and cultured stocks of major crustacean species in 2013 to 2015. Hematodinium sp. infections were identified in wild stocks of Portunus trituberculatus from Huludao, Laizhou, Qingdao, Yangtze River Estuary and Zhoushan, and Scylla paramamosain from Shantou; and cultured stocks of Portunus trituberculatus and Penaeus monodon from a polyculture pond in Qingdao...
May 11, 2017: Diseases of Aquatic Organisms
https://www.readbyqxmd.com/read/28492173/disease-ecology-of-hematodinium-perezi-in-a-high-salinity-estuary-investigating-seasonal-trends-in-environmental-detection
#12
K A Lycett, J S Pitula
The blue crab Callinectes sapidus has seen a general decline in population levels. One factor influencing mortality is infections by Hematodinium perezi, a dinoflagellate parasite. A 2 yr study was conducted in 2014 and 2015 to monitor H. perezi DNA within the Maryland (USA) coastal bays, comparing seasonal cycles in the abundance of parasite DNA in environmental samples to parasite presence in host blue crabs. A late summer to early fall peak in H. perezi infections in blue crabs was observed, consistent with previous work...
May 11, 2017: Diseases of Aquatic Organisms
https://www.readbyqxmd.com/read/28481198/a-diverse-host-thrombospondin-type-1-repeat-protein-repertoire-promotes-symbiont-colonization-during-establishment-of-cnidarian-dinoflagellate-symbiosis
#13
Emilie-Fleur Neubauer, Angela Z Poole, Philipp Neubauer, Olivier Detournay, Kenneth Tan, Simon K Davy, Virginia M Weis
The mutualistic endosymbiosis between cnidarians and dinoflagellates is mediated by complex inter-partner signaling events, where the host cnidarian innate immune system plays a crucial role in recognition and regulation of symbionts. To date, little is known about the diversity of thrombospondin-type-1 repeat (TSR) domain proteins in basal metazoans and or their potential role in regulation of cnidarian-dinoflagellate mutualisms. We reveal a large and diverse repertoire of TSR proteins in seven anthozoan species, and show that in the model sea anemone Aiptasia pallida the TSR domain promotes colonization of the host by the symbiotic dinoflagellate Symbiodinium minutum...
May 8, 2017: ELife
https://www.readbyqxmd.com/read/28480012/exploring-the-impact-of-multidecadal-environmental-changes-on-the-population-genetic-structure-of-a-marine-primary-producer
#14
Nina Lundholm, Sofia Ribeiro, Anna Godhe, Lene Rostgaard Nielsen, Marianne Ellegaard
Many marine protists form resting stages that can remain viable in coastal sediments for several decades. Their long-term survival offers the possibility to explore the impact of changes in environmental conditions on population dynamics over multidecadal time scales. Resting stages of the phototrophic dinoflagellate Pentapharsodinium dalei were isolated and germinated from five layers in dated sediment cores from Koljö fjord, Sweden, spanning ca. 1910-2006. This fjord has, during the last century, experienced environmental fluctuations linked to hydrographic variability mainly driven by the North Atlantic Oscillation...
May 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28474820/the-long-term-persistence-of-phytoplankton-resting-stages-in-aquatic-seed-banks
#15
Marianne Ellegaard, Sofia Ribeiro
In the past decade, research on long-term persistence of phytoplankton resting stages has intensified. Simultaneously, insight into life-cycle variability in the diverse groups of phytoplankton has also increased. Aquatic 'seed banks' have tremendous significance and show many interesting parallels to terrestrial seed beds of vascular plants, but are much less studied. It is therefore timely to review the phenomenon of long-term persistence of aquatic resting stages in sediment seed banks. Herein we compare function, morphology and physiology of phytoplankton resting stages to factors central for persistence of terrestrial seeds...
May 5, 2017: Biological Reviews of the Cambridge Philosophical Society
https://www.readbyqxmd.com/read/28473821/boosted-membrane-potential-as-bioenergetic-response-to-anoxia-in-dinoroseobacter-shibae
#16
Christian Kirchhoff, Heribert Cypionka
Dinoroseobacter shibae DFL 12(T) is a metabolically versatile member of the world-wide abundant Roseobacter clade. As an epibiont of dinoflagellates D. shibae is subjected to rigorous changes in oxygen availability. It has been shown that it loses up to 90% of its intracellular ATP when exposed to anoxic conditions. Yet, D. shibae regenerates its ATP level quickly when oxygen becomes available again. In the present study we focused on the bioenergetic aspects of the quick recovery and hypothesized that the proton-motive force decreases during anoxia and gets restored upon re-aeration...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28472730/modifications-of-the-soluble-proteome-of-a-mediterranean-strain-of-the-invasive-neurotoxic-dinoflagellate-alexandrium-catenella-under-metal-stress-conditions
#17
Natacha Jean, Estelle Dumont, Faouzi Herzi, Thierry Balliau, Mohamed Laabir, Estelle Masseret, Stéphane Mounier
The soluble proteome of the mediterranean strain ACT03 of the invasive neurotoxic dinoflagellate Alexandrium catenella exposed to lead or zinc at 6, 12 or 18μM (total concentrations), or under control conditions, was characterized by two-dimensional gel electrophoresis (2-DE). Zinc reduced (P<0.05) the total number of protein spots (-41%, -52% and -60%, at 6, 12 or 18μM, respectively). Besides, most of the proteins constituting the soluble proteome were down-regulated in response to lead or zinc stresses...
April 19, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28472048/multispecies-mass-mortality-of-marine-fauna-linked-to-a-toxic-dinoflagellate-bloom
#18
Michel Starr, Stéphane Lair, Sonia Michaud, Michael Scarratt, Michael Quilliam, Denis Lefaivre, Michel Robert, Andrew Wotherspoon, Robert Michaud, Nadia Ménard, Gilbert Sauvé, Sylvie Lessard, Pierre Béland, Lena Measures
Following heavy precipitation, we observed an intense algal bloom in the St. Lawrence Estuary (SLE) that coincided with an unusually high mortality of several species of marine fish, birds and mammals, including species designated at risk. The algal species was identified as Alexandrium tamarense and was determined to contain a potent mixture of paralytic shellfish toxins (PST). Significant levels of PST were found in the liver and/or gastrointestinal contents of several carcasses tested as well as in live planktivorous fish, molluscs and plankton samples collected during the bloom...
2017: PloS One
https://www.readbyqxmd.com/read/28469613/bacterial-associates-modify-growth-dynamics-of-the-dinoflagellate-gymnodinium-catenatum
#19
Christopher J S Bolch, Thaila A Bejoy, David H Green
Marine phytoplankton cells grow in close association with a complex microbial associate community known to affect the growth, behavior, and physiology of the algal host. The relative scale and importance these effects compared to other major factors governing algal cell growth remain unclear. Using algal-bacteria co-culture models based on the toxic dinoflagellate Gymnodinium catenatum, we tested the hypothesis that associate bacteria exert an independent effect on host algal cell growth. Batch co-cultures of G...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28469605/evolution-of-dimethylsulfoniopropionate-metabolism-in-marine-phytoplankton-and-bacteria
#20
REVIEW
Hannah A Bullock, Haiwei Luo, William B Whitman
The elucidation of the pathways for dimethylsulfoniopropionate (DMSP) synthesis and metabolism and the ecological impact of DMSP have been studied for nearly 70 years. Much of this interest stems from the fact that DMSP metabolism produces the climatically active gas dimethyl sulfide (DMS), the primary natural source of sulfur to the atmosphere. DMSP plays many important roles for marine life, including use as an osmolyte, antioxidant, predator deterrent, and cryoprotectant for phytoplankton and as a reduced carbon and sulfur source for marine bacteria...
2017: Frontiers in Microbiology
keyword
keyword
46253
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"