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https://www.readbyqxmd.com/read/28623024/functional-diversity-of-aquatic-ciliates
#1
REVIEW
Thomas Weisse
This paper first reviews the concept of functional diversity in general terms and then applies it to free-living aquatic ciliates. Ciliates are extremely versatile organisms and display an enormous functional diversity as key elements of pelagic food webs, acting as predators of bacteria, algae, other protists and even some metazoans. Planktonic ciliates are important food for zooplankton, and mixotrophic and functionally autotrophic species may significantly contribute to primary production in the ocean and in lakes...
April 13, 2017: European Journal of Protistology
https://www.readbyqxmd.com/read/28564627/assessing-the-influence-of-confounding-biological-factors-when-estimating-bioaccumulation-of-pcbs-with-passive-samplers-in-aquatic-ecosystems
#2
Kaisa Figueiredo, Kimmo Mäenpää, Merja Lyytikäinen, Jouni Taskinen, Matti T Leppänen
Passive samplers are promising surrogates for organisms, mimicking bioaccumulation. However, several biological characteristics disturb the passive partitioning process in organisms by accelerating or restraining bioaccumulation, resulting in species-specific body residues of hydrophobic organic contaminants (HOCs). In addition to site-specific characteristics and HOC concentrations, age, sex, diet, biotransformation capability and habitat-specific characteristics may affect body residues. Two passive sampler types, polyethylene (PE) and polydimethylsiloxane (PDMS) were deployed in a PCB-contaminated freshwater lake water and sediment, respectively, to assess their bioaccumulation prediction capacity...
May 28, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28542872/classification-of-planctonema-like-algae-including-a-new-genus-planctonemopsis-gen-nov-a-new-species-planctonema-gelatinosum-sp-nov-and-a-reinstated-genus-psephonema-trebouxiophyceae-chlorophyta
#3
Xudong Liu, Huan Zhu, Benwen Liu, Guoxiang Liu, Zhengyu Hu
Planctonema-like species consist of planktonic green algae and are found throughout the world. Their characteristic morphology, which includes short and slender filaments consisting of side-by-side or distant cylindrical cells enclosed in a fine and hyaline sheath, makes them easily distinguishable. To date, Planctonema lauterbornii was the only taxon accepted for this group. However, descriptions from different materials have revealed notable morphological differences, including the presence/absence of a pyrenoid, a mucilage sheath and an apical thickening of the cell wall...
May 19, 2017: Journal of Phycology
https://www.readbyqxmd.com/read/28539649/interspecies-interactions-reverse-the-hazard-of-antibiotics-exposure-a-plankton-community-study-on-responses-to-ciprofloxacin-hydrochloride
#4
Changyou Wang, Ziyang Wang, Yong Zhang, Rongguo Su
The ecotoxicological effects of Ciprofloxacin hydrochloride (CIP) were tested on population densities of plankton assemblages consisting of two algae (Isochrysis galbana and Platymonas subcordiformis) and a rotifer (Brachionus plicatilis). The I. galbana showed a significant decrease in densities when concentrations of CIP were above 2.0 mg L(-1) in single-species tests, while P. subcordiformis and B. plicatilis were stable in densities when CIP were less than10.0 mg L(-1). The equilibrium densities of I...
May 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28451768/invasive-planktivores-as-mediators-of-organic-matter-exchanges-within-and-across-ecosystems
#5
Scott F Collins, David H Wahl
Bighead carp (Hypophthalmichthys nobilis) are an invasive planktivore that can greatly deplete planktonic resources. Due to the inefficient conversion of food into fish tissue, large portions of consumed materials are egested and shunted to benthic habitats. We explored how bighead carp alter pools of organic matter between planktonic and benthic habitats, and across ecosystem boundaries. Here, we report evidence from a manipulative experiment demonstrating that bighead carp greatly reapportion pools of organic matter from planktonic to benthic habitats to such a degree that additional effects propagated across ecological boundaries into terrestrial ecosystems...
June 2017: Oecologia
https://www.readbyqxmd.com/read/28295286/predicting-coastal-algal-blooms-in-southern-california
#6
John A McGowan, Ethan R Deyle, Hao Ye, Melissa L Carter, Charles T Perretti, Kerri D Seger, Alain de Verneil, George Sugihara
The irregular appearance of planktonic algae blooms off the coast of southern California has been a source of wonder for over a century. Although large algal blooms can have significant negative impacts on ecosystems and human health, a predictive understanding of these events has eluded science, and many have come to regard them as ultimately random phenomena. However, the highly nonlinear nature of ecological dynamics can give the appearance of randomness and stress traditional methods-such as model fitting or analysis of variance-to the point of breaking...
March 10, 2017: Ecology
https://www.readbyqxmd.com/read/28279937/can-nutrient-pathways-and-biotic-interactions-control-eutrophication-in-riverine-ecosystems-evidence-from-a-model-driven-mesocosm-experiment
#7
Christoph G Jäger, Jeske Hagemann, Dietrich Borchardt
Ecological theory predicts that the relative importance of benthic to planktonic primary production usually changes along the rivers' continuum from a predomination of benthic algae in lower stream orders to a predomination of planktonic algae at higher orders. Underlying mechanisms driving the interaction between algae in these habitats, its controlling factors and consequences for riverine ecosystems are, however, only partly understood. We present a mechanistic analysis of the governing ecological processes using a simplified, numerical model and examine how abiotic factors and biotic interactions influence benthic and planktonic algae by changing resource competition...
May 15, 2017: Water Research
https://www.readbyqxmd.com/read/28160696/a-systematic-study-on-photocatalysis-of-antipyrine-catalyst-characterization-parameter-optimization-reaction-mechanism-a-toxicity-evolution-to-plankton
#8
Han Gong, Wei Chu, Meijuan Chen, Qinxing Wang
The toxicity of antipyrine (AP) in the photodegradation using UV/CoFe2O4/TiO2 was investigated by analyzing the characteristic of the catalyst, the effect of parameters (light source wavelength, catalyst dose, pH and initial AP concentration), the reaction mechanism (the organic intermediates, TOC reduction and inorganic ions release) and the newly proposed low-dosage-high-effective radical reaction approach. The catalyst shows the optimal removal efficiency under the conditions of wavelength at 350 nm, the catalyst dose at 0...
April 1, 2017: Water Research
https://www.readbyqxmd.com/read/28154770/physicochemical-process-crustacean-and-microcystis-biomass-changes-in-situ-enclosure-after-introduction-of-silver-carp-at-meiliang-bay-lake-taihu
#9
Chengjie Yin, Longgen Guo, Chunlong Yi, Congqiang Luo, Leyi Ni
In order to control cyanobacteria blooms with silver carp in Lake Taihu, an in situ experiment was carried out by stocking silver carp at a biomass of 35, 70, and 150 g m(-3) and no carp control in waterproof enclosures. Physicochemical water parameters and biomass of plankton were measured in enclosures to evaluate the suitable stocking density of silver carp for relieving internal nutrients and constraining cyanobacteria growth in Lake Taihu. It is found that the 35 g m(-3) silver carp group and 70 g m(-3) silver carp group presented lower total phosphorus, lower chlorophyll-a, and higher water transparency...
2017: Scientifica
https://www.readbyqxmd.com/read/28130735/impact-of-micro-and-macroelement-content-on-potential-use-of-freshwater-sediments-gyttja-derived-from-lakes-of-eastern-latvia
#10
Zane Vincevica-Gaile, Karina Stankevica
Organic-rich freshwater sediments formed from the remains of water plants, plankton and benthic organisms, which are transformed by microorganisms, and mixed with mineral components supplied from the lake basin, are known as gyttja (sapropel or dy). Gyttja is a valuable natural resource that can be used in various fields such as agriculture, forestry, construction, chemical industry, balneology and the latter ones are especially interested in chemical composition and safety of natural materials. The aim of the study was to investigate micro- and macro-element content of gyttja derived from lakes of eastern Latvia (north-east of Europe)...
January 27, 2017: Environmental Geochemistry and Health
https://www.readbyqxmd.com/read/28114412/to-swim-or-not-to-swim-potential-transmission-of-balaenophilus-manatorum-copepoda-harpacticoida-in-marine-turtles
#11
Francesc Domènech, Jesús Tomás, José Luis Crespo-Picazo, Daniel García-Párraga, Juan Antonio Raga, Francisco Javier Aznar
Species of Balaenophilus are the only harpacticoid copepods that exhibit a widespread, obligate association with vertebrates, i.e., B. unisetus with whales and B. manatorum with marine turtles and manatees. In the western Mediterranean, juveniles of the loggerhead sea turtle, Caretta caretta are the only available hosts for B. manatorum, which has been found occurring at high prevalence (>80%) on them. A key question is how these epibionts are transmitted from host to host. We investigated this issue based on experiments with live specimens of B...
2017: PloS One
https://www.readbyqxmd.com/read/28089533/bias-and-association-of-sediment-organic-matter-source-apportionment-indicators-a-case-study-in-a-eutrophic-lake-chaohu-china
#12
Fu-Liu Xu, Chen Yang, Wei He, Qi-Shuang He, Yi-Long Li, Lei Kang, Wen-Xiu Liu, Yong-Qiang Xiong, Baoshan Xing
The sources of sediment organic matter (SOM) could be explained by various indicators. To test their biases and associations, the present study determined multiple indicators for SOM source apportionment, including elemental analysis (carbon and nitrogen, and their stable isotope δ(13)C and δ(15)N), n-alkanes compositions as well as derivative indicators (e.g., terrigenous to aquatic ratio), and carbon isotopes of n-alkane in Lake Chaohu, a eutrophic lake. The spatial variation of anthropogenic effects could be revealed by SOM elemental variations...
January 12, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28088106/uv-a-induced-delayed-development-in-the-larvae-of-coral-seriatopora-caliendrum
#13
Jie Zhou, Tung-Yung Fan, John Beardall, Kunshan Gao
Coral reefs are vulnerable to ultraviolet radiation (UVR, 280-400nm). Not only do the fluxes of UVR fluctuate daily, they are also increasing due to global ocean and atmospheric changes. The deleterious effects of UVR on scleractinian corals have been intensively studied, but much less is known about the response of corals in the early pre-settlement phase. In this study, we tested how UVR exposure affects survival and development of Seriatopora caliendrum larvae and examined the photophysiological changes induced in the symbiotic dinoflagellate Symbiodinium...
February 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/28079143/lethal-sublethal-responses-of-daphnia-magna-to-acute-norfloxacin-contamination-and-changes-in-phytoplankton-zooplankton-interactions-induced-by-this-antibiotic
#14
Ying Pan, Shi-Wei Yan, Ruo-Zhu Li, Yi-Wen Hu, Xue-Xiu Chang
Although the well-known antibiotic norfloxacin (NOR) is recognized as an important environmental pollutant, little is known about its impacts on ecological processes, particularly on species interactions. In this paper, we quantified Daphnia magna (Crustacea, Cladocera) responses in mortality rate at lethal NOR concentrations (0, 25, 50, 100, 200, 300 and 400 mg L(-1)), and in heartbeat rate, swimming behavior and feeding rate (on the green alga Chlorella pyrenoidosa) at sublethal NOR concentrations (0, 25, 50 and 100 mg L(-1)) to determine the effects of this antibiotic in plankton systems...
January 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28073532/toxigenic-algae-and-associated-phycotoxins-in-two-coastal-embayments-in-the-ebro-delta-nw-mediterranean
#15
Julia A Busch, Karl B Andree, Jorge Diogène, Margarita Fernández-Tejedor, Kerstin Toebe, Uwe John, Bernd Krock, Urban Tillmann, Allan D Cembella
Harmful Algal Bloom (HAB) surveillance is complicated by high diversity of species and associated phycotoxins. Such species-level information on taxonomic affiliations and on cell abundance and toxin content is, however, crucial for effective monitoring, especially of aquaculture and fisheries areas. The aim addressed in this study was to determine putative HAB taxa and related phycotoxins in plankton from aquaculture sites in the Ebro Delta, NW Mediterranean. The comparative geographical distribution of potentially harmful plankton taxa was established by weekly field sampling throughout the water column during late spring-early summer over two years at key stations in Alfacs and Fangar embayments within the Ebro Delta...
May 2016: Harmful Algae
https://www.readbyqxmd.com/read/27996008/unusual-marine-unicellular-symbiosis-with-the-nitrogen-fixing-cyanobacterium-ucyn-a
#16
REVIEW
Jonathan P Zehr, Irina N Shilova, Hanna M Farnelid, Maria Del Carmen Muñoz-MarínCarmen, Kendra A Turk-Kubo
Nitrogen fixation - the reduction of dinitrogen (N2) gas to biologically available nitrogen (N) - is an important source of N for terrestrial and aquatic ecosystems. In terrestrial environments, N2-fixing symbioses involve multicellular plants, but in the marine environment these symbioses occur with unicellular planktonic algae. An unusual symbiosis between an uncultivated unicellular cyanobacterium (UCYN-A) and a haptophyte picoplankton alga was recently discovered in oligotrophic oceans. UCYN-A has a highly reduced genome, and exchanges fixed N for fixed carbon with its host...
December 20, 2016: Nature Microbiology
https://www.readbyqxmd.com/read/27934263/power-of-plankton-effects-of-algal-biodiversity-on-biocrude-production-and-stability
#17
Anita Narwani, Aubrey R Lashaway, David C Hietala, Phillip E Savage, Bradley J Cardinale
Algae-derived biocrude oil is a possible renewable energy alternative to fossil fuel based crude oil. Outdoor cultivation in raceway ponds is estimated to provide a better return on energy invested than closed photobioreactor systems. However, in these open systems, algal crops are subjected to environmental variation in temperature and irradiance, as well as biotic invasions which can cause costly crop instabilities. In this paper, we used an experimental approach to investigate the ability of species richness to maximize and stabilize biocrude production in the face of weekly temperature fluctuations between 17 and 27 °C, relative to a constant-temperature control...
December 6, 2016: Environmental Science & Technology
https://www.readbyqxmd.com/read/27902440/synechococcus-diversity-along-a-trophic-gradient-in-the-osterseen-lake-district-bavaria
#18
Joachim Ruber, Franziska R Bauer, Andrew D Millard, Uta Raeder, Juergen Geist, Katrin Zwirglmaier
Picocyanobacteria are important primary producers in freshwater; however, there is still a knowledge gap regarding their diversity at the strain level. For this reason, the microbial diversity of four lakes with different trophic states was investigated by sequencing of the 16S rRNA gene using universal primers. The study was performed in selected lakes of the Osterseen Lake District, Germany, from 2012 to 2014 (Lake Schiffhuettensee: eutrophic; Lake Ostersee: meso-oligotrophic; Lake Groebensee: oligotrophic; Lake Lustsee: oligotrophic)...
December 2016: Microbiology
https://www.readbyqxmd.com/read/27881349/-diagnosis-of-drowning-by-detecting-gyrb-and-16s-rrna-genes-of-aeromonas-hydrophila-using-pcr-capillary-electrophoresis
#19
Bai-Sheng Mai, Qu-Yi Xu, Chao Liu, Jian Zhao, Ya-Li Han
OBJECTIVE: To establish a method for diagnosis of freshwater drowning by amplifying gyrB and 16S rRNA genes of Aeromonas hydrophila using PCR coupled with capillary electrophoresis (CE). METHODS: DNA samples were extracted from human, 18 planktons (including Candida albicans, Aeromonas hydrophila, and 16 species of algae), and 30 cases of tissue samples (including the lung, liver, and kidney, all examined with microwave digestion-vacuum filtration-automated scanning electron microscopy) from human cadavers, including 28 freshwater drowning victims and 2 with natural death...
November 20, 2016: Nan Fang Yi Ke da Xue Xue Bao, Journal of Southern Medical University
https://www.readbyqxmd.com/read/27871041/toxicity-of-aqueous-vanadium-to-zooplankton-and-phytoplankton-species-of-relevance-to-the-athabasca-oil-sands-region
#20
Stephanie Schiffer, Karsten Liber
Vanadium (V) is an abundant trace metal present in bitumen from the Athabasca Oil Sands (AOS) region in Alberta, Canada. The upgrading of bitumen can result in the production of large volumes of a carbonaceous material referred to as petroleum coke that contains V at elevated levels compared to the native bitumen. Previous studies have shown that coke has the capacity to leach ecotoxicologically relevant levels of V into water it contacts, yet limited data are available on the toxicity of aqueous V to planktonic organisms...
March 2017: Ecotoxicology and Environmental Safety
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