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Marine Environmental Research

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https://www.readbyqxmd.com/read/30017202/ecological-feedback-mechanisms-and-variable-disturbance-regimes-the-uncertain-future-of-mediterranean-macroalgal-forests
#1
E Maggi, E Puccinelli, L Benedetti-Cecchi
Loss of algal canopies can result in a shift towards a turf-dominated state, where variability in species life-history traits can determine new mechanisms of feedback, and influence the degraded system under variable regimes of disturbance. By focusing on rockpools dominated by Cystoseira brachycarpa, we tested the hypothesis that the alga Dictyopteris polypodioides could take advantage of extreme regimes of disturbance related to storms, and outcompete other turfs through a distinctive combination of life traits...
July 9, 2018: Marine Environmental Research
https://www.readbyqxmd.com/read/29983191/removal-treatments-alter-the-recruitment-dynamics-of-a-global-marine-invader-implications-for-management-feasibility
#2
Graham Epstein, Stephen J Hawkins, Dan A Smale
Frameworks designed to prioritise the management of invasive non-native species (INNS) must consider many factors, including their impacts on native biodiversity, ecosystem services, and human health. Management feasibility should also be foremost in any prioritisation process, but is often overlooked, particularly in the marine environment. The Asian kelp, Undaria pinnatifida, is one of the most cosmopolitan marine INNS worldwide and recognised as a priority species for monitoring in the UK and elsewhere. Here, experimental monthly removals of Undaria (from 0...
July 6, 2018: Marine Environmental Research
https://www.readbyqxmd.com/read/29983192/transcriptomic-lipid-and-histological-profiles-suggest-changes-in-health-in-fish-from-a-pesticide-hot-spot
#3
Sharon E Hook, Julie Mondon, Andrew T Revill, Paul A Greenfield, Rachael A Smith, Ryan D R Turner, Patricia A Corbett, Michael St J Warne
Barramundi (Lates calcarifer) were collected at the beginning (1st sampling) and end (2nd sampling) of the wet season from Sandy Creek, an agriculturally impacted catchment in the Mackay Whitsundays region of the Great Barrier Reef catchment area, and from Repulse Creek, located approximately 100 km north in Conway National Park, to assess the impacts of pesticide exposure. Gill and liver histology, lipid class composition in muscle, and the hepatic transcriptome were examined. The first sample of Repulse Creek fish showed little tissue damage and low transcript levels of xenobiotic metabolism enzymes...
June 30, 2018: Marine Environmental Research
https://www.readbyqxmd.com/read/29970251/research-gaps-of-coral-ecology-in-a-changing-world
#4
REVIEW
Juliano Morais, Aline P M Medeiros, Bráulio A Santos
Coral reefs have long inspired marine ecologists and conservationists around the world due to their ecological and socioeconomic importance. Much knowledge on the anthropogenic impacts on coral species has been accumulated, but relevant research gaps on coral ecology remain underappreciated in human-modified seascapes. In this review we assessed 110 studies on coral responses to five major human disturbances- acidification, climate change, overfishing, pollution and non-regulated tourism -to identify geographic and theoretical gaps in coral ecology and help to guide further researches on the topic...
June 30, 2018: Marine Environmental Research
https://www.readbyqxmd.com/read/29970250/potentially-harmful-microalgae-and-algal-blooms-in-the-red-sea-current-knowledge-and-research-needs
#5
REVIEW
Zakaria A Mohamed
Harmful algal blooms (HABs) have increased throughout the world's coastal oceans during the last century mostly due to water eutrophication and climate change. These blooms are often accompanied by extreme extensive negative impacts to fisheries, coastal resources, public health and local economies. However, limited studies have reported HAB events in Red Sea coastal waters. This article reviews potentially harmful microalgae in the Red Sea, based on available published information during the last 3 decades...
June 28, 2018: Marine Environmental Research
https://www.readbyqxmd.com/read/29980294/quantifying-avian-avoidance-of-offshore-wind-turbines-current-evidence-and-key-knowledge-gaps
#6
REVIEW
Aonghais S C P Cook, Elizabeth M Humphreys, Finlay Bennet, Elizabeth A Masden, Niall H K Burton
The risk of collision between birds and turbines is seen as one of the key issues in the planning process for offshore wind farms. In some cases, predictions of collision risk have led to projects either being withdrawn from the planning process, or refused planning consent. Despite this, the evidence base on which collision risk is assessed is extremely limited and assessments rely on models which can be highly sensitive to assumptions, notably about bird collision avoidance behaviour. We present a synthesis of the current state of knowledge about collision risk and avoidance behaviour in seabirds...
June 26, 2018: Marine Environmental Research
https://www.readbyqxmd.com/read/29945731/effect-of-marine-protected-areas-on-distinct-fish-life-history-stages
#7
Fabiana C Félix-Hackradt, Carlos W Hackradt, Jorge Treviño-Otón, Ángel Pérez-Ruzafa, José A García-Charton
The role of Marine Protected Areas on distinct life stages of Mediterranean reef fish species (classified on the basis of their economic value and mobility categories) was assessed in a network of marine reserves in SE Spain. Only abundance and biomass of adult of both commercial and demersal species were positively affected by protection. Gradients across reserve boundaries (as a clue to the occurrence of spillover) were observed for fish abundance but not for biomass, indicating a protected fish assemblage with a predominance of small-sized individuals...
June 23, 2018: Marine Environmental Research
https://www.readbyqxmd.com/read/29941154/building-up-marine-biodiversity-loss-artificial-substrates-hold-lower-number-and-abundance-of-low-occupancy-benthic-and-sessile-species
#8
Jose A Sanabria-Fernandez, Natali Lazzari, Rodrigo Riera, Mikel A Becerro
Ocean sprawl is replacing natural substrates with artificial alternatives. We hypothesized that, after submersion, high occupancy, high mobility species colonize artificial substrates faster than low occupancy, low mobility species, a biodiversity divergence that will slowly fade out with time. Using quantitative visual census of species in 10 artificial and their adjacent natural substrates, we tested for the existence and temporal evolution of this divergence. Assigning species to one of three occupancy and one of three mobility categories, we found that artificial substrates increased the performance of high mobility, high occupancy species while decreased the performance of low mobility species with medium and low occupancy...
June 22, 2018: Marine Environmental Research
https://www.readbyqxmd.com/read/29937199/distinct-habitat-use-strategies-of-sympatric-rorqual-whales-within-a-fjord-system
#9
E M Keen, J Wray, J F Pilkington, K L Thompson, C R Picard
We used ecosystem sampling during systematic surveys and opportunistic focal follows, comparison tests, and random forest models to evaluate fin whale (Balaenoptera physalus) and humpback whale (Megaptera novaeangliae) habitat associations within an inland feeding ground (Kitimat Fjord System, British Columbia, Canada). Though these species are sympatric and share a common prey source, they were attuned to different aspects of the local habitat. The fin whales were associated with habitat properties reminiscent of the open ocean...
June 18, 2018: Marine Environmental Research
https://www.readbyqxmd.com/read/29933903/the-use-of-metabarcoding-for-meiofauna-ecological-patterns-assessment
#10
Laiza Cabral de Faria, Maikon Di Domenico, Sónia C S Andrade, Monique Cristina Dos Santos, Gustavo Fonseca, Joana Zanol, A Cecilia Z Amaral
Marine meiofauna comprises up to 22 phyla. Its morphological identification requires time and taxonomists' expertise, and molecular tools can make this task faster. We aim to disentangle meiofaunal diversity patterns at Araçá Bay by applying a model selection approach and estimating the effectiveness of metabarcoding (18S rDNA) and morphological methods for estimating the response of meiofauna diversity in small-scale interactions with environmental variables. A rarefaction curve indicated that ten samples were sufficient for estimating the total number of meiofauna OTUs in a tidal flat...
June 14, 2018: Marine Environmental Research
https://www.readbyqxmd.com/read/29921450/benthic-mucilage-blooms-threaten-coralligenous-reefs
#11
L Piazzi, F Atzori, N Cadoni, M F Cinti, F Frau, G Ceccherelli
Mucilaginous aggregates produced by planktonic or benthic algae are considered ecological threats to marine systems. The study evaluated the effects of the spread of benthic mucilaginous aggregates on the structure of coralligenous assemblages. The assemblage and the quality of a site subjected to a benthic mucilage bloom were compared to those of two reference sites using a Before/After-Control/Impact (BACI) design. Results showed the α and β-diversity, ESCA and COARSE quality ecological indices and the cover of encrusting algae and bryozoans were lower at the impact site after the mucilage event than at the control sites and at the impact site before the mucilage event...
June 14, 2018: Marine Environmental Research
https://www.readbyqxmd.com/read/29910028/spatio-temporal-variability-of-ichthyophagous-bird-assemblage-around-western-mediterranean-open-sea-cage-fish-farms
#12
Felipe Aguado-Giménez, Sergio Eguía-Martínez, Jesús Cerezo-Valverde, Benjamín García-García
Ichthyophagous birds aggregate at cage fish farms attracted by caged and associated wild fish. Spatio-temporal variability of such birds was studied for a year through seasonal visual counts at eight farms in the western Mediterranean. Correlation with farm and location descriptors was assessed. Considerable spatio-temporal variability in fish-eating bird density and assemblage structure was observed among farms and seasons. Bird density increased from autumn to winter, with the great cormorant being the most abundant species, also accounting largely for differences among farms...
June 14, 2018: Marine Environmental Research
https://www.readbyqxmd.com/read/29910029/comparative-sensitivity-of-crassostrea-angulata-and-crassostrea-gigas-embryo-larval-development-to-as-under-varying-salinity-and-temperature
#13
Anthony Moreira, Etelvina Figueira, Giovanni Libralato, Amadeu M V M Soares, Marco Guida, Rosa Freitas
Oysters are a diverse group of marine bivalves that inhabit coastal systems of the world's oceans, providing a variety of ecosystem services, and represent a major socioeconomic resource. However, oyster reefs have become inevitably impacted from habitat destruction, overfishing, pollution and disease outbreaks that have pushed these structures to the break of extinction. In addition, the increased frequency of climate change related events promise to further challenge oyster species survival worldwide. Oysters' early embryonic development is likely the most vulnerable stage to climate change related stressors (e...
June 7, 2018: Marine Environmental Research
https://www.readbyqxmd.com/read/29895506/exposure-to-sublethal-concentrations-of-tributyltin-reduced-survival-growth-and-20-hydroxyecdysone-levels-in-a-marine-mysid
#14
Bo-Mi Kim, Manoharan Saravanan, Do-Hee Lee, Jung-Hoon Kang, Moonkoo Kim, Jee-Hyun Jung, Jae-Sung Rhee
Tributyltin (TBT) is as an antifouling organotin compound used in boat paints. Although organotin-based antifouling agents have been banned on a global scale, the mode of action of TBT has been studied in numerous aquatic species because of its toxicity, persistence, bioaccumulation potential, and endocrine-disrupting characteristics. In this study, we conducted 96-h acute toxicity tests wherein we exposed juvenile and adult marine mysids to waterborne TBT. Over 4 weeks of exposure, mortality was dose-dependently increased in juveniles and adult mysids...
June 7, 2018: Marine Environmental Research
https://www.readbyqxmd.com/read/29929735/disturbance-in-na-regulation-in-cells-rich-in-mitochondria-isolated-from-gills-of-the-yellow-clam-mesodesma-mactroides-exposed-to-copper-under-different-osmotic-conditions
#15
Lygia S Nogueira, Adalto Bianchini
Cells rich in mitochondria were isolated from gills of the seawater clam Mesodesma mactroides, incubated in isosmotic saline solution (840 mOsmol/kg H2 O), and exposed (3 h) to environmentally realistic Cu concentrations (nominally: 0, 5, 9 and 20 μg/L). In cells exposed to 20 μg Cu/L, Cu accumulation, Na+ content reduction and carbonic anhydrase (CA) activity inhibition were observed, without significant changes in cell viability and Na+ ,K+ -ATPase (NKA) activity. In the absence of Cu, cell viability and Cu content were reduced in hyposmotic media respect with the control, without changes in Na+ content and enzyme (CA and NKA) activities...
June 5, 2018: Marine Environmental Research
https://www.readbyqxmd.com/read/29891387/nematodes-stimulate-biomass-accumulation-in-a-multispecies-diatom-biofilm
#16
An-Sofie D'Hondt, Willem Stock, Lander Blommaert, Tom Moens, Koen Sabbe
While the effects of abiotic parameters on microbial tidal biofilms are relatively well-documented, the effects of grazing and/or bioturbation by meiofauna are poorly understood. We investigated the impact of a natural nematode assemblage on the biomass and microbial community structure of a multispecies diatom biofilm. Nematodes stimulated diatom biomass accumulation of the biofilm and caused a shift in diatom community structure. Higher diatom biomass accumulation in the presence of nematodes could be the result of increased diatom biomass production through nutrient regeneration resulting from grazing or bioturbation, and/or through shifts in interspecific interactions between diatoms (e...
June 5, 2018: Marine Environmental Research
https://www.readbyqxmd.com/read/29891388/primer-selection-influences-abundance-estimates-of-ammonia-oxidizing-archaea-in-coastal-marine-sediments
#17
Alexis Marshall, Lori Phillips, Andrew Longmore, Caixian Tang, Karla Heidelberg, Pauline Mele
Quantification of the α-subunit of ammonia monooxygenase (amoA) through PCR is an established technique for estimating the abundance of ammonia oxidizing archaea (AOA) in environmental samples. This study quantified AOA with two established primer sets in 1 cm increments from the sediment surface (0-1 cm) to a depth of 10 cm at two locations within Port Phillip Bay (PPB), Australia. Primer choice had a significant effect on within sample estimates of AOA with copy numbers ranging from 102 to 104 copies per ng DNA...
June 4, 2018: Marine Environmental Research
https://www.readbyqxmd.com/read/29880295/a-review-of-the-knowledge-of-shallow-subtidal-benthic-communities-in-brazil
#18
REVIEW
Marcelo Checoli Mantelatto, Igor Cristino Silva Cruz, Joel Christopher Creed
No abstract text is available yet for this article.
May 30, 2018: Marine Environmental Research
https://www.readbyqxmd.com/read/29895505/ddrad-seq-based-phylogeographic-study-of-sargassum-thunbergii-phaeophyceae-heterokonta-around-japanese-coast
#19
Honoka Kobayashi, Yuka Haino, Takaya Iwasaki, Ayumi Tezuka, Atsushi J Nagano, Satoshi Shimada
Using genome-wide SNP data obtained from high-throughput techniques based on double digest restriction site-associated DNA sequencing (ddRAD-seq), we elucidated the migration history and genetic diversity of the Japanese population of the ecologically important brown seaweed Sargassum thunbergii (Mertens ex Roth) Kuntze. STRUCTURE and NeighborNet analyses showed a clear genetic differentiation among populations of four geographic regions: Kyushu (POP1); Sea of Japan (POP2); Hokkaido and Tohoku (POP3); and Pacific coast from Kyushu to Kanto (POP4)...
May 26, 2018: Marine Environmental Research
https://www.readbyqxmd.com/read/29843909/molluscan-indicator-species-and-their-potential-use-in-ecological-status-assessment-using-species-distribution-modeling
#20
Manos L Moraitis, Irini Tsikopoulou, Antonios Geropoulos, Panagiotis D Dimitriou, Nafsika Papageorgiou, Marianna Giannoulaki, Vasilis D Valavanis, Ioannis Karakassis
Marine habitat assessment using indicator species through Species Distribution Modeling (SDM) was investigated. The bivalves: Corbula gibba and Flexopecten hyalinus were the indicator species characterizing disturbed and undisturbed areas respectively in terms of chlorophyll a concentration in Greece. The habitat suitability maps of these species reflected the overall ecological status of the area. The C. gibba model successfully predicted the occurrence of this species in areas with increased physical disturbance driven by chlorophyll a concentration, whereas the habitat map for F...
May 24, 2018: Marine Environmental Research
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