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Marine Environmental Research

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https://www.readbyqxmd.com/read/28431764/seasonal-monitoring-of-blue-mussel-mytilus-spp-populations-in-a-harbor-area-a-focus-on-responses-to-environmental-factors-and-chronic-contamination
#1
C Lacroix, E Duvieilbourg, N Guillou, J Guyomarch, C Bassoulet, D Moraga, G Chapalain, M Auffret
Coastal waters corresponding to macrotidal systems are among the most variable marine biotopes. Sessile animals as bivalve mollusks may however be found forming intertidal beds at high densities, as allowed by full adaptation to local conditions. A better knowledge of adaptive responses to environmental factors is required to foresee possible adverse effects of global change. At the sub-cellular level, transcriptional responses are among the earliest signals of environmental disturbances and they can reveal subtle and meaningful changes in organism exposed to stress...
April 12, 2017: Marine Environmental Research
https://www.readbyqxmd.com/read/28431763/immune-response-of-the-short-neck-clam-paphia-malabarica-to-salinity-stress-using-flow-cytometry
#2
Deodatta S Gajbhiye, Lidita Khandeparker
Paphia malabarica is a predominant and commercially important bivalve in India, persistently challenged by wavering salinity in a monsoon-influenced estuary. To examine the organism's immunological response under such a condition we challenged P. malabarica with different salinities (0, 5, 15, 25 and 35) for varied periods using a two-way experimental approach (in vitro and in vivo). This is the first study to report the response of P. malabarica hemocytes to salinity stress from a monsoon-influenced estuary on the southwest coast of India...
April 11, 2017: Marine Environmental Research
https://www.readbyqxmd.com/read/28410750/assessing-the-impact-of-diclofenac-ibuprofen-and-sildenafil-citrate-viagra-%C3%A2-on-the-fertilisation-biology-of-broadcast-spawning-marine-invertebrates
#3
Norlaila Binti Mohd Zanuri, Matthew G Bentley, Gary S Caldwell
Exposure to synthetic chemicals is a key environmental challenge faced by aquatic organisms. The time and dose effects of the pharmaceuticals diclofenac, ibuprofen, and sildenafil citrate on sperm motility and successful fertilisation are studied using the echinoderms, Asterias rubens and Psammechinus miliaris, and the polychaete worm Arenicola marina, all important components of the marine benthos. Motility was reduced for all species when exposed to diclofenac concentrations ≥0.1 μg/L. Exposure to ≥1...
April 8, 2017: Marine Environmental Research
https://www.readbyqxmd.com/read/28416257/nrf2-and-regulation-of-the-antioxidant-system-in-the-antarctic-silverfish-pleuragramma-antarctica-adaptation-to-environmental-changes-of-pro-oxidant-pressure
#4
Maria Elisa Giuliani, Maura Benedetti, Marco Nigro, Francesco Regoli
Despite the key importance of Nrf2-Keap1 in regulating antioxidant system in vertebrates, this system is still poorly investigated in marine species. The present study focused on the Antarctic silverfish Pleuragramma antarctica which, during the final phases of embryo development in platelet ice, is challenged by a sudden enhancement of environmental oxidative conditions associated to ice melting. Partial coding sequences were identified for Nrf2, its repressor Keap1 and for typical Nrf2-target antioxidant genes, like catalase, glutathione peroxidase isoform 1 and Cu/Zn-dependent superoxide dismutase...
April 7, 2017: Marine Environmental Research
https://www.readbyqxmd.com/read/28413104/altered-epiphyte-community-and-sea-urchin-diet-in-posidonia-oceanica-meadows-in-the-vicinity-of-volcanic-co2-vents
#5
Patricia Nogueira, Maria Cristina Gambi, Salvatrice Vizzini, Gianmaria Califano, Ana Mafalda Tavares, Rui Santos, Begoña Martínez-Crego
Ocean acidification (OA) predicted for 2100 is expected to shift seagrass epiphyte communities towards the dominance of more tolerant non-calcifying taxa. However, little is known about the indirect effects of such changes on food provision to key seagrass consumers. We found that epiphyte communities of the seagrass Posidonia oceanica in two naturally acidified sites (i.e. north and south sides of a volcanic CO2 vent) and in a control site away from the vent at the Ischia Island (NW Mediterranean Sea) significantly differed in composition and abundance...
April 5, 2017: Marine Environmental Research
https://www.readbyqxmd.com/read/28411869/detection-of-endocrine-disrupting-chemicals-and-evidence-of-their-effects-on-the-hpg-axis-of-the-european-anchovy-engraulis-encrasicolus
#6
Andrea Miccoli, Francesca Maradonna, Andrea De Felice, Vincenzo Caputo Barucchi, Andone Estonba, Michele Genangeli, Sauro Vittori, Iole Leonori, Oliana Carnevali
Natural/synthetic Endocrine Disrupting Chemicals (EDCs) may display estrogenic activity and a lower potency than 17β-estradiol. Nonetheless, their concentrations and additive effects can affect the endocrine system and reproductive processes related to the Hypothalamic-Pituitary-Gonadal (HPG) axis. Because of their persistence in both the environment and biological systems, they ultimately target multi-level predators, including humans. We detected presence and effects of xenobiotics on wild anchovy Engraulis encrasicolus in the Western Adriatic Sea...
April 5, 2017: Marine Environmental Research
https://www.readbyqxmd.com/read/28413103/do-larval-types-affect-genetic-connectivity-at-sea-testing-hypothesis-in-two-sibling-marine-gastropods-with-contrasting-larval-development
#7
Maria Vittoria Modica, Valeria Russini, Giulia Fassio, Marco Oliverio
In marine environments, connectivity among populations of benthic invertebrates is provided primarily by dispersion of larvae, with the duration of pelagic larval phase (PLD) supposed to represent one of the major factor affecting connectivity. In marine gastropods, PLD is linked to specific larval development types, which may be entirely intracapsular (thus lacking a pelagic dispersal), or include a short pelagic lecithotrophic or a long planktotrophic phase. In the present study, we investigated two sibling species of the cosmopolitan neogastropod genus Columbella (commonly known as dove shells): Columbella adansoni Menke, 1853, from the Macaronesian Atlantic archipelagos, with planktotrophic development, and Columbella rustica Linnaeus, 1758, from the Mediterranean Sea, with intracapsular development...
April 4, 2017: Marine Environmental Research
https://www.readbyqxmd.com/read/28395870/dongsha-atoll-a-potential-thermal-refuge-for-reef-building-corals-in-the-south-china-sea
#8
Konstantin S Tkachenko, Keryea Soong
Dongsha Atoll (also known as the Pratas Islands), the northernmost atoll in the South China Sea, experiences two contrasting physical phenomena: repetitive anomalies of the sea surface temperature exceeding the coral bleaching threshold and regular effects of the world's strongest internal waves resulting in the rhythmic upwelling of cold deep waters at the outer reef slopes of the atoll. This unique combination may result in significant differences in coral species composition and structure between the lagoon and forereef...
April 4, 2017: Marine Environmental Research
https://www.readbyqxmd.com/read/28385268/macroinvertebrate-communities-from-the-shallow-soft-bottoms-of-deception-island-southern-ocean-a-paradise-for-opportunists
#9
Carlos Angulo-Preckler, Carlos Leiva, Conxita Avila, Sergi Taboada
Deception Island (South Shetland Islands) is an atypical spot in its Antarctic context, being a still active volcano with a submerged caldera. Although the sea-floor of its enclosed bay, Port Foster, has been extensively studied from 40 m down, little is known about the macrozoobenthic composition of its shallower areas. The aim of this study was to characterize the so far unexplored soft-bottom marine macroinvertebrate communities living within the first few meters depth in Port Foster. Eight sampling stations were selected, and three replicates per station and depth (5 and 15 m) were collected by SCUBA diving using 0...
March 29, 2017: Marine Environmental Research
https://www.readbyqxmd.com/read/28400049/species-co-occurrence-affects-the-trophic-interactions-of-two-juvenile-reef-shark-species-in-tropical-lagoon-nurseries-in-moorea-french%C3%A2-polynesia
#10
Philip Matich, Jeremy J Kiszka, Johann Mourier, Serge Planes, Michael R Heithaus
Food web structure is shaped by interactions within and across trophic levels. As such, understanding how the presence and absence of predators, prey, and competitors affect species foraging patterns is important for predicting the consequences of changes in species abundances, distributions, and behaviors. Here, we used plasma δ(13)C and δ(15)N values from juvenile blacktip reef sharks (Carcharhinus melanopterus) and juvenile sicklefin lemon sharks (Negaprion acutidens) to investigate how species co-occurrence affects their trophic interactions in littoral waters of Moorea, French Polynesia...
March 28, 2017: Marine Environmental Research
https://www.readbyqxmd.com/read/28390660/isotopic-niches-of-fin-whales-from-the-mediterranean-sea-and-the-celtic-sea-north-atlantic
#11
Krishna Das, Ophélie Holleville, Conor Ryan, Simon Berrow, Anita Gilles, Denis Ody, Loïc N Michel
The fin whale (Balaenoptera physalus) is the most abundant and widespread mysticete species in the Mediterranean Sea, found mostly in deep, offshore waters of the western and central portion of the region. In the Mediterranean, this species is known to feed mainly on krill, in contrast to its Atlantic counterpart, which displays a more diversified diet. The International Whaling Commission recognizes several managements units in the Atlantic and the Mediterranean Sea and the connectivity between these populations is still being debated...
March 27, 2017: Marine Environmental Research
https://www.readbyqxmd.com/read/28366280/coral-reefs-as-the-first-line-of-defense-shoreline-protection-in-face-of-climate-change
#12
REVIEW
Carla I Elliff, Iracema R Silva
Coral reefs are responsible for a wide array of ecosystem services including shoreline protection. However, the processes involved in delivering this particular service have not been fully understood. The objective of the present review was to compile the main results in the literature regarding the study of shoreline protection delivered by coral reefs, identifying the main threats climate change imposes to the service, and discuss mitigation and recovery strategies that can and have been applied to these ecosystems...
March 25, 2017: Marine Environmental Research
https://www.readbyqxmd.com/read/28372811/acclimatory-processes-are-likely-responsible-for-metal-tolerance-in-oyster-embryos
#13
Thanvapon Yingprasertchai, Richard Man Kit Yu, Wayne A O'Connor, Tegan Hopwood, Geoff R MacFarlane
We aimed to determine if offspring of oysters from contaminated locations were more tolerant to metals, and whether this tolerance could be attributed to acclimation. Oysters from 10 estuaries were sampled, representing a gradient in metal contamination. Tolerance to metals of the F1 offspring from adults residing in these estuaries was assessed. Then, adults from these estuaries were translocated to a single estuary and their offspring tolerance reassessed. No linear relationship was found between the Cu concentrations of adults and their offspring's tolerance to Cu...
March 23, 2017: Marine Environmental Research
https://www.readbyqxmd.com/read/28365158/ontogenetic-dietary-shifts-and-bioaccumulation-of-diphenhydramine-in-mugil-cephalus-from-an-urban-estuary
#14
Samuel P Haddad, Bowen Du, W Casan Scott, Gavin N Saari, Christopher Breed, Martin Kelly, Linda Broach, C Kevin Chambliss, Bryan W Brooks
Though bioaccumulation of pharmaceuticals has received attention in inland waters, studies of pharmaceutical bioaccumulation in estuarine and marine systems are limited. Further, an understanding of pharmaceutical bioaccumulation across size classes of organisms displaying ontogenetic feeding shifts is lacking. We selected the striped mullet, Mugil cephalus, a euryhaline and eurythermal species that experiences dietary shifts with age, to identify whether a model base, diphenhydramine, accumulated in a tidally influenced urban bayou...
March 23, 2017: Marine Environmental Research
https://www.readbyqxmd.com/read/28342651/from-classical-to-nonparametric-growth-models-towards-comprehensive-modelling-of-mussel-growth-patterns
#15
Isabel Fuentes-Santos, Uxío Labarta, Kristina Arranz, Mª José Fernández-Reiriz
Understanding biological processes, such as growth, is crucial to development management and sustainability plans for bivalve populations. Von Bertalanffy and Gompertz models have been commonly used to fit bivalve growth. These models assume that individual growth is only determined by size, overlooking the effects of environmental and intrinsic conditions on growth patterns. The comparison between classical models and nonparametric GAM (generalized additive models) fits conducted in this work shows that the latter provide a more realistic approach of mussel growth measured in terms of shell length, and dry weight of hard and soft tissues...
March 18, 2017: Marine Environmental Research
https://www.readbyqxmd.com/read/28336053/non-indigenous-predators-threaten-ecosystem-engineers-interactive-effects-of-green-crab-and-oyster-size-on-american-oyster-mortality
#16
Tyler R Pickering, Luke A Poirier, Timothy J Barrett, Shawn McKenna, Jeff Davidson, Pedro A Quijón
Non-indigenous green crabs (Carcinus maenas) are emerging as important predators of autogenic engineers like American oysters (Crassostrea virginica) throughout the eastern seaboard of Canada and the United States. To document the spreading distribution of green crabs, we carried out surveys in seven sites of Prince Edward Island during three fall seasons. To assess the potential impact of green crabs on oyster mortality in relation to predator and prey size, we conducted multiple predator-prey manipulations in the field and laboratory...
March 12, 2017: Marine Environmental Research
https://www.readbyqxmd.com/read/28336052/does-reef-structure-affect-oyster-food-resources-a-stable-isotope-assessment
#17
Brittany N Blomberg, Benoit Lebreton, Terence A Palmer, Gaël Guillou, Jennifer Beseres Pollack, Paul A Montagna
As ecosystem engineers, oysters create and maintain structured habitat and can influence trophodynamics and benthic-pelagic coupling in the surrounding landscape. The physical reef structure and associated biotic parameters can affect the availability of food resources for oysters. Oysters and potential composite food sources - suspended particulate organic matter (SPOM) and surface sediment organic matter (SSOM) - were assessed using a dual stable isotope (δ(13)C, δ(15)N) approach at three reef types (natural, restored, and unconsolidated) seasonally for two years to determine if changes in physical and/or biotic parameters affected the relative availability and/or use of food resources by oysters...
March 11, 2017: Marine Environmental Research
https://www.readbyqxmd.com/read/28292585/effects-of-symbiotic-bacteria-on-chemical-sensitivity-of-daphnia-magna
#18
Patcharaporn Manakul, Saranya Peerakietkhajorn, Tomoaki Matsuura, Yasuhiko Kato, Hajime Watanabe
The crustacean zooplankton Daphnia magna has been widely used for chemical toxicity tests. Although abiotic factors have been well documented in ecotoxicological test protocols, biotic factors that may affect the sensitivity to chemical compounds remain limited. Recently, we identified symbiotic bacteria that are critical for the growth and reproduction of D. magna. The presence of symbiotic bacteria on Daphnia raised the question as to whether these bacteria have a positive or negative effect on toxicity tests...
March 6, 2017: Marine Environmental Research
https://www.readbyqxmd.com/read/28237403/marine-gametes-in-a-changing-ocean-impacts-of-climate-change-stressors-on-fecundity-and-the-egg
#19
Shawna A Foo, Maria Byrne
In marine invertebrates, the environmental history of the mother can influence fecundity and egg size. Acclimation of females in climate change stressors, increased temperature and low pH, results in a decrease in egg number and size in many taxa, with the exception of cephalopods, where eggs increase in size. With respect to spawned eggs, near future levels of ocean acidification can interfere with the egg's block to polyspermy and intracellular pH. Reduction of the extracellular egg jelly coat seen in low pH conditions has implications for impaired egg function and fertilization...
February 17, 2017: Marine Environmental Research
https://www.readbyqxmd.com/read/28260615/hypoxia-effects-on-oxidative-stress-and-immunocompetence-biomarkers-in-the-mussel-perna-perna-mytilidae-bivalvia
#20
Lílian Nogueira, Danielle Ferraz Mello, Rafael Trevisan, Danielly Garcia, Daiane da Silva Acosta, Alcir Luiz Dafre, Eduardo Alves de Almeida
This study investigated the effects of hypoxia on oxidative stress response and immune function in mussels Perna perna exposed to air for 6, 12, 24 and 48 h. In air-exposed mussels, the antioxidant enzymes superoxide dismutase (SOD), catalase, and glutathione reductase (GR) activities were lower in gill tissues (24-48 h) and digestive gland (12 h), while the glutathione peroxidase and GR activities were increased in the digestive gland (48 h). In both tissues, aerial exposure promoted a rapid (6 h) and persistent (up to 48 h) increase of glutathione levels...
May 2017: Marine Environmental Research
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