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Marine Environmental Research

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https://www.readbyqxmd.com/read/30448239/condition-of-pteropod-shells-near-a-volcanic-co-2-vent-region
#1
Clara Manno, Paola Rumolo, Marco Barra, Sergio d'Albero, Gualtiero Basilone, Simona Genovese, Salvatore Mazzola, Angelo Bonanno
Natural gradients of pH in the ocean are useful analogues for studying the projected impacts of Ocean Acidification (OA) on marine ecosystems. Here we document the in situ impact of submarine CO2 volcanic emissions (CO2 vents) on live shelled-pteropods (planktonic gastropods) species Creseis conica in the Gulf of Naples (Tyrrhenian Sea, Mediterranean). Since the currents inside the Gulf will likely drive those pelagic calcifying organisms into and out of the CO2 vent zones, we assume that pteropods will be occasionally exposed to the vents during their life cycle...
November 9, 2018: Marine Environmental Research
https://www.readbyqxmd.com/read/30448016/anthropogenic-nutrient-inputs-in-the-nw-iberian-peninsula-estuaries-determined-by-nitrogen-and-carbon-isotopic-signatures-of-zostera-noltei-seagrass-meadows
#2
M Román, E Fernández, G Méndez
Coastal watersheds of the NW Iberian Peninsula have undergone increases in population densities and urbanization over the past decades. However, the effect of altered nutrient inputs to estuarine Zostera noltei ecosystems associated to these anthropogenic pressures remains largely unknown. Eleven Zostera noltei meadows located in the NW Iberian Peninsula were studied to assess the relationship between the anthropogenic pressure over coastal watersheds and the nitrogen and carbon isotopic signatures of Z. noltei meadows...
November 9, 2018: Marine Environmental Research
https://www.readbyqxmd.com/read/30442331/effects-of-the-fungicide-ortho-phenylphenol-opp-on-the-early-development-of-sea-urchin-eggs
#3
Natsumi Hosoya, Kyoko Motomura, Emiko Tagawa, Misuzu Nagano, Chiharu Ogihara, Hiroshi Hosoya
In this study, we assessed the impact of imidazole fungicide ortho-phenylphenol (OPP) on the early development of a marine invertebrate, the sea urchin, a marine bioindicator. Fungicides are widely used and have been reported to accumulate not only in farm soil but also in freshwater and seawater sediments. Therefore, it is essential to clarify the effects of OPP on marine environments. Toxicity was estimated as the inhibition ratio of the 120 min-embryo and/or the 24 h-embryo development. The addition of OPP to embryos of the two sea urchin species, Scaphechinus mirabilis (S...
November 2, 2018: Marine Environmental Research
https://www.readbyqxmd.com/read/30420134/toxicity-evaluation-of-carboxylated-carbon-nanotubes-to-the-reef-forming-tubeworm-ficopomatus-enigmaticus-fauvel-1923
#4
Lucia De Marchi, Matteo Oliva, Rosa Freitas, Victor Neto, Etelvina Figueira, Federica Chiellini, Andrea Morelli, Amadeu M V M Soares, Carlo Pretti
In recent years, oxidative stress has been recognized as one of the most common effects of nanoparticles in different organisms. Ficopomatus enigmaticus (Fauvel, 1923), a member of a large family of serpulidae polychates, is an important encrusting organism in a diverse set of marine habitats, from harbours to coral reefs. This species has been previously studied for ecotoxicological purposes, despite the lack of reported studies on this species biochemical response after exposure to different pollutants. For these reasons, and for the first time, a set of biomarkers related to oxidative status were assessed in polychaetes after 28 days of exposure...
November 2, 2018: Marine Environmental Research
https://www.readbyqxmd.com/read/30415781/the-transcriptome-of-the-marine-calanoid-copepod-temora-longicornis-under-heat-stress-and-recovery
#5
Ilias Semmouri, Jana Asselman, Filip Van Nieuwerburgh, Dieter Deforce, Colin R Janssen, Karel A C De Schamphelaere
Understanding the impacts of global change in zooplankton communities is crucial, as alterations in the zooplankton communities can affect entire marine ecosystems. Despite the economic and ecological importance of the calanoid copepod Temora longicornis in the Belgian part of the North Sea, molecular data is still very limited for this species. Using HiSeq Illumina sequencing, we sequenced the whole transcriptome of T. longicornis, after being exposed to realistic temperatures of 14 and 17 °C. After both an acute (1 day) and a more sustained (5 days) thermal exposure to 17 °C, we investigated gene expression differences with animals exposed to 14 °C, which may be critical for the thermal acclimation and resilience of this copepod species...
November 1, 2018: Marine Environmental Research
https://www.readbyqxmd.com/read/30409383/towards-the-development-of-a-high-throughput-screening-approach-for-mytilus-edulis-hemocytes-a-case-study-on-silicon-based-nanomaterials
#6
Andrew Barrick, Catherine Mouneyrac, Nicolas Manier, Loïc De Lantivy, Nisrine Jrad, Amélie Châtel
To have an understanding of potential mechanistic effects, sublethal endpoints able to discriminate between nanomaterials with similar physical and chemical features need to be used. In this sense, quantitative PCR was used to measure a battery of genes linked to a wide array of different cellular processes. Gene expression was measured in Mytilus edulis hemocytes following an in vitro and in vivo exposure to pure silicon (40 nm) and carbon-coated silicon (40 and 75 nm) after 24 h. Partial least squares discriminant analysis and correlation analysis were used to develop an integrative model, describing the relationship between genes, to identify which genes were important in describing responses to engineered nanomaterial exposure...
November 1, 2018: Marine Environmental Research
https://www.readbyqxmd.com/read/30409384/sessile-macrobenthos-ochrophyta-drives-seasonal-change-of-meiofaunal-community-structure-on-temperate-rocky-reefs
#7
V Losi, C Sbrocca, G Gatti, F Semprucci, M Rocchi, C N Bianchi, M Balsamo
Unlike the soft bottom meiofauna, meiofauna associated to hard substrata is poorly studied, despite its ecological relevance. Since communities of hard substrata are usually characterized by species with different life cycles and strategies from those of soft bottom assemblages, information on hard substrata meiofauna is still needed. In this study, sessile macrobenthos and the associated meiofaunal assemblages of two sites of Portofino (NW Mediterranean) were investigated in two seasons at three different depths on both sub-vertical and inclined reefs...
October 31, 2018: Marine Environmental Research
https://www.readbyqxmd.com/read/30389235/diet-change-of-hadal-amphipods-revealed-by-fatty-acid-profile-a-close-relationship-with-surface-ocean
#8
Linlin Shi, Wenjie Xiao, Zhiguo Liu, Binbin Pan, Yunping Xu
The diet of hadal organisms remains elusive because of the difficulty in sampling and monitoring at the great water depths (6-11 km). Here we analyzed fatty acids of the amphipods collected from three Pacific trenches, namely New Britain Trench (NBT; 8.2-8.9 km), Mariana Trench (MT; 11 km) and Massau Trench (MS; 6.9 km). A total of 35 fatty acids including saturated, monounsaturated and polyunsaturated compounds were identified. The principal component analysis (PCA) divides major fatty acids into three groups indicative of carrion (C20:4ω6 , C22:5ω6 , C22:6ω3, C16:1ω7, and C18:1ω9 ), algae (C18:2ω6 and C20:5ω3 ) and bacteria (C15:0 , isoC15:0 , isoC17:0 , anteisoC17:0 and C17:0 ), respectively...
October 25, 2018: Marine Environmental Research
https://www.readbyqxmd.com/read/30389236/toxicity-effects-of-zinc-on-two-marine-diatoms-under-varying-macronutrient-environment
#9
P R Anu, S Bijoy Nandan, P R Jayachandran, N D Don Xavier, A M Midhun, D Mohan
Diatoms constitute one of the fundaments in the trophic food chains and are responsible for much of the bioaccumulation of heavy metals, in particular zinc, throughout the web of food chains. Chaetoceros calcitrans and Thalassiosira weissflogii are widely present as a dominant marine diatom in estuarine and coastal waters. The zinc uptake, its fractionation in subcellular structures and macromolecular compartments in two marine diatoms, C. calcitrans and T. weissflogii and trophic transfer under different macronutrient concentrations were investigated...
October 24, 2018: Marine Environmental Research
https://www.readbyqxmd.com/read/30376996/bivalve-trophic-ecology-in-the-mediterranean-spatio-temporal-variations-and-feeding-behavior
#10
Ariadna Purroy, Mirjana Najdek, Enrique Isla, Ivan Župan, Julien Thébault, Melita Peharda
The trophic ecology of two bivalves, the clam Callista chione and the cockle Glycymeris bimaculata was studied using environmental and biochemical variables of the suspended particulate matter and the sediment. Samples were collected from two shallow sites, Pag and Cetina, in the coastal oligotrophic Mediterranean Sea, during a 17 month period. The temporal variation of the particulate matter reflected a mixture between marine and terrestrial sources throughout the year, with a clear marine influence during summer and fall, and predominance of terrestrial inputs during spring and winter...
October 23, 2018: Marine Environmental Research
https://www.readbyqxmd.com/read/30389237/gene-expression-and-genotoxicity-in-manila-clam-ruditapes-philippinarum-modulated-by-sediment-contamination-and-lagoon-dynamics-in-the-po-river-delta
#11
Fabrizio Stefani, Nadia Casatta, Christian Ferrarin, Alberto Izzotti, Francesco Maicu, Luigi Viganò
The lagoons of the Po River delta are potentially exposed to complex mixtures of contaminants, nevertheless, there is a substantial lack of information about the biological effects of these contaminants in the Po delta lagoons. These environments are highly dynamic and the interactions between chemical and environmental stressors could prevent the proper identification of biological effects and their causes. In this study, we aimed to disentangle such interactions focusing on Manila clams, previously exposed to six lagoons of the Po delta, adopting three complementary tools: a) the detailed description via modelling techniques of lagoon dynamics for salinity and water temperature; b) the response sensitivity of a number of target genes (ahr, cyp4, ρ-gst, σ-gst, hsp22, hsp70, hsp90, ikb, dbh, ach, cat, Mn-sod, Cu/Zn-sod, cyp-a, flp, grx, TrxP) investigated in clam digestive glands by Real Time PCR; and c) the relevance of DNA adducts determined in clams as markers of exposure to genotoxic chemicals...
October 21, 2018: Marine Environmental Research
https://www.readbyqxmd.com/read/30448238/seasonal-transcriptomes-of-the-antarctic-pteropod-limacina-helicina-antarctica
#12
Kevin M Johnson, Juliet M Wong, Umihiko Hoshijima, Cailan S Sugano, Gretchen E Hofmann
High latitude seas will be among the first marine systems to be impacted by ocean acidification (OA). Previous research studying the effects of OA on the pteropod, Limacina helicina antarctica, has led this species to be identified as a sentinel organism for OA in polar oceans. Here, we present gene expression data on L. h. antarctica, collected in situ during the seasonal transition from early spring to early summer. Our findings suggest that after over-wintering under seasonal sea ice, pteropods progress toward full maturity in the early summer when food becomes increasingly available...
October 18, 2018: Marine Environmental Research
https://www.readbyqxmd.com/read/30366612/sources-partitioning-in-the-diet-of-the-shipworm-bankia-carinata-j-e-gray-1827-an-experimental-study-based-on-stable-isotopes
#13
François Charles, Pierre-Guy Sauriau, Fabien Aubert, Benoît Lebreton, François Lantoine, Pascal Riera
Adaptations that allow teredinids to maintain and thrive on wood, a nutritionally unbalanced food, make these marine bivalves remarkable. Capable of filter-feeding, shipworms house endosymbiotic bacteria synthesizing cellulolytic enzymes for digestion of wood carbohydrates and providing nitrogen to their host through nitrogen fixation. To what extent each of these nutrition modes contributes to the shipworm's metabolism remains an open question. In this experimental study, we estimated source partitioning through the determination of δ13 C and δ15 N values in original biological samples...
October 17, 2018: Marine Environmental Research
https://www.readbyqxmd.com/read/30361105/a-spatial-risk-approach-towards-integrated-marine-spatial-planning-a-case-study-on-european-hake-nursery-areas-in-the-north-alboran-sea
#14
M Muñoz, A Reul, L Gil de Sola, R A M Lauerburg, O Tello, A Gimpel, V Stelzenmüller
Europe's Blue Growth strategy promotes the intensification of human activities at sea and increases the environmental risk such as the decline of the provision of key ecosystem services and potential conflicts among human activities. The fishing sector, in the Alboran Sea, is economically and culturally one of the most important and relies on overexploited target species such as European hake (Merlucius merlucius). Here we identified and quantified the impact of human pressures on the capacity of marine habitats to support the provision of food as an important ecosystem service...
October 16, 2018: Marine Environmental Research
https://www.readbyqxmd.com/read/30352700/indications-of-future-performance-of-native-and-non-native-adult-oysters-under-acidification-and-warming
#15
Anaëlle J Lemasson, Jason M Hall-Spencer, Stephen Fletcher, Samuel Provstgaard-Morys, Antony M Knights
Globally, non-native species (NNS) have been introduced and now often entirely replace native species in captive aquaculture; in part, a result of a perceived greater resilience of NSS to climate change and disease. Here, the effects of ocean acidification and warming on metabolic rate, feeding rate, and somatic growth was assessed using two co-occurring species of oysters - the introduced Pacific oyster Magallana gigas (formerly Crassostrea gigas), and native flat oyster Ostrea edulis. Biological responses to increased temperature and pCO2 combinations were tested, the effects differing between species...
October 15, 2018: Marine Environmental Research
https://www.readbyqxmd.com/read/30348474/global-warming-induced-temperature-effects-to-intertidal-tropical-and-temperate-meiobenthic-communities
#16
Anna-Maria Vafeiadou, Bryan Lloyd P Bretaña, Carl Van Colen, Giovanni A P Dos Santos, Tom Moens
Global climate change and the related temperature rise strongly impact marine life and have long been in the center of scientific attention. This experimental work investigates thermal-stress effects on intertidal meiofauna from tropical and temperate coasts, focusing on community responses. Natural communities were exposed for a month to ambient, elevated constant temperatures and diurnal fluctuating temperature regimes with elevated peak maxima, to mimic realistic future climate conditions. Abundance, biodiversity, community composition and functional diversity were assessed...
October 15, 2018: Marine Environmental Research
https://www.readbyqxmd.com/read/30337051/deciphering-carbon-sources-of-mussel-shell-carbonate-under-experimental-ocean-acidification-and-warming
#17
Yanan Lu, Li Wang, Lianshun Wang, Yuting Cong, Guojun Yang, Liqiang Zhao
Ocean acidification and warming is widely reported to affect the ability of marine bivalves to calcify, but little is known about the underlying mechanisms. In particular, the response of their calcifying fluid carbonate chemistry to changing seawater carbonate chemistry remains poorly understood. The present study deciphers sources of the dissolved inorganic carbon (DIC) in the calcifying fluid of the blue mussel (Mytilus edulis) reared at two pH (8.1 and 7.7) and temperature (16 and 22 °C) levels for five weeks...
October 13, 2018: Marine Environmental Research
https://www.readbyqxmd.com/read/30342772/genetic-diversity-and-gene-flow-of-the-threatened-brazilian-endemic-parrotfish-scarus-trispinosus-valenciennes-1840
#18
Inajara Marques Bezerra, Karina Peres Gramacho, Mariana Araújo Barreto, Carlos Werner Hackradt, João Lucas Leão Feitosa, Rodrigo Augusto Torres, Beatrice Padovani Ferreira, Mercedes González-Wanguemert, Fabiana Cézar Félix-Hackradt
The greenback parrotfish, Scarus trispinosus, is the largest herbivorous fish inhabiting Southwestern Atlantic reefs, and was recently included in the IUCN red list of threatened species as endangered due to the overexploitation of their populations. The aim of this work was to evaluate the existence of structured populations (i.e. genetic unities) along a coast of approximately 2000 km of the NE Brazilian coast. The transferability of 17 primers synthesized for Scarus rubroviolaceus was tested for S. trispinosus and five transferable loci were validated and used...
October 9, 2018: Marine Environmental Research
https://www.readbyqxmd.com/read/30316461/vulnerability-of-juvenile-hermit-crabs-to-reduced-seawater-ph-and-shading
#19
Marilia Nagata Ragagnin, Ian Donald McCarthy, Wellington Silva Fernandez, André Paulo Tschiptschin, Alexander Turra
Multiple simultaneous stressors induced by anthropogenic activities may amplify their impacts on marine organisms. The effects of ocean acidification, in combination with other anthropogenic impacts (apart from temperature) are poorly understood, especially in coastal regions. In these areas, shading caused by infrastructure development, such as harbor construction, may potentially interact with CO2 -induced pH reduction and affect invertebrate populations. Here, we evaluated the effects of reduced pH (7.6) and shading (24h in darkness) on mortality, growth, calcification and displacement behavior to live predator (danger signal) and dead gastropod (resource availability signal) odors using juveniles of the hermit crab Pagurus criniticornis collected in Araçá Bay (São Paulo state, Southeastern Brazil)...
October 6, 2018: Marine Environmental Research
https://www.readbyqxmd.com/read/30337052/mature-biofilm-communities-on-synthetic-polymers-in-seawater-specific-or-general
#20
Inga V Kirstein, Antje Wichels, Georg Krohne, Gunnar Gerdts
To understand the ecological impacts of the "Plastisphere", those microbes need to be identified that preferentially colonize and interact with synthetic polymer surfaces, as opposed to general surface colonizers. It was hypothesized that the microbial biofilm composition varies distinctly between different substrates. A long-term incubation experiment was conducted (15month) with nine different synthetic polymer films as substrate as well as glass using a natural seawater flow-through system. To identify colonizing microorganisms, 16S and 18SrRNA gene tag sequencing was performed...
October 2, 2018: Marine Environmental Research
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