Seasonal Temperature Differentially Modulates the Immunotranscriptomic Performance in Atlantic Salmon Skin in Response to Natural Infestation in Open-Ocean Cages.

Chile is the second-largest producer of Atlantic salmon (), a key industry facing challenges such as infestations by , which cause significant economic losses. However, there are no studies exploring how environmental variables in marine culture centers affect salmon's immune response, considering their poikilothermic characteristics. This study analyzed the effect of the seasonal temperature on the skin transcriptome of Atlantic salmon infested with in fjord-based farms in the Aysén Region during autumn and spring.

Iron pollution has minor impacts on the behavioral ecology of the Brazilian endemic reef damselfish Stegastes fuscus.

Coral reefs face profound threats from global and local stressors, including coastal pollution from human activities like mining. This study investigates the potential impacts of increased iron (Fe) on the behavioral ecology of juvenile Stegastes fuscus, a pivotal territorial damselfish species on Brazilian reefs affected by a major mining dam disaster. In a controlled mesocosm experiment over 28 days, 16 damselfish (16 experimental tanks, one fish per tank, four fish per treatment) were exposed to a gradient of iron concentrations, from background in coastal seawater to maximum values recorded in the ocean after the dam collapse (over 900 μg L).

Modulation of immune response and tissue repair mechanisms in the gill filaments of Atlantic salmon (Salmo salar) affected by complex gill disease (CGD) in a marine open sea-cage environment.

Complex gill disease (CGD) poses significant challenges in Atlantic salmon aquaculture, leading to reduced growth, higher production costs, and increased mortality rates. CGD is influenced by a multifactorial interaction of environmental factors and pathogens. Given the impact of CGD and the lack of molecular studies aimed at characterizing and modulating it, this study analyzed the modulation of genes and biological processes that occur in the CGD-affected gill filaments of Atlantic salmon.

UV-degradation is a key driver of the fate and impacts of marine plastics. How can laboratory experiments be designed to effectively inform risk assessment?

Marine plastic litter is subject to different abiotic and biotic forces that lead to its degradation, the main driver being UV-induced photodegradation. Since UV-exposure leads to both physical and chemical degradation of plastic, leading to a release of micro- and nanoplastics as well as leaching of chemicals and degradation products - it is expected to have radical impacts on plastics fate and effects in the marine environment. The number of laboratory studies investigating the mechanisms of plastic UV-degradation in seawater has increased significantly in the past 10 years, but are the exposures designed in a manner that allow observations to be extrapolated to environmental fate? Most studies to date focus on quantifying plastic fragmentation and surface changes, but is this relevant for impact assessments? Here, we provide a review of the current scientific literature on UV-degradation of plastic under marine conditions.

Holocene mollusks and paleogeographical evolution of the doñana national park, Europe's largest biological reserve: A review.

This paper summarizes knowledge on the Holocene malacological record of the Doñana National Park, the largest nature reserve in Europe. It includes more than 50 species of bivalves and gastropods, mostly marine, being the common cockle Cerastoderma edule the most abundant during the middle and late Holocene. The record of these groups, the dating of the numerous cores that contain them, and the ecology of the species allows us to understand the paleogeographic evolution of this park, dominated by tidal marshes and tidal channels during the early Holocene, later flooded during the Holocene transgressive maximum.

Impact of iron exposure on Brazilian coral reefs: Acute vs. chronic stress responses.

Prior research has shown that exposure to metals increases corals vulnerability to bleaching by heightened oxidative stress. Understanding the impact of metal contamination on coral health in their natural environmental is crucial. This study investigate the effects of iron (Fe) exposure on Brazilian coral reef species.

A Periodic 4-h Extension of the Dark Period Did Not Cause Long-Term Changes in the Circadian Regulation of Photosynthesis and Sugar Levels in Lettuces.

The photoperiod in controlled environment agriculture can be adjusted to minimize electricity consumption, even if it differs from the plant's circadian rhythm. Daily modifications of the photoperiod disrupt the plant's circadian resonance state, resulting in altered growth and yield. However, the effects of periodic, rather than daily, photoperiod adjustments remain less understood.

Proficiency testing and cross-laboratory method comparison to support standardisation of diatom DNA metabarcoding for freshwater biomonitoring.

DNA metabarcoding of benthic diatoms has been successfully applied for biomonitoring at the national scale and can now be considered technically ready for routine application. However, protocols and methods still vary between and within countries, limiting their transferability and the comparability of results. In order to overcome this, routine use of DNA metabarcoding for diatom biomonitoring requires knowledge of the sources of variability introduced by the different steps of the procedure.

Is parasitic infection a buffer against metal pollution?

Metal pollution is a major global issue in aquatic environments, affecting environmental quality and potentially altering host-parasite dynamics. This study evaluates the buffering role of a larval trematode sp. under experimental conditions to test the effect of copper (Cu) exposure on the survival of the marine snail Snails were collected from intertidal rocky pools over a two-month period from Coloso (23°45'S, 70°28'W), northern Chile, and identified as parasitized or unparasitized.

Increased Platelet Adhesiveness in Patients with Venous Thromboembolic Disease.

 Association between global platelet function and the risk of venous thromboembolic disease (VTE) has been proposed, though the mechanisms do not involve increased platelet aggregation. However, platelet adhesiveness has not been systematically explored in VTE patients.  To evaluate platelet adhesive functions in VTE patients.

Mortality patterns and recovery challenges in Millepora alcicornis after mass bleaching event on Northeast Brazilian reefs.

Coral reefs are suffering globally from the increased frequency and intensification of thermal anomalies, caused by anthropogenic climate change, leading to major mass bleaching events over the past three decades. Environmental factors, including temperature, geomorphology, interspecific competition, protection status and local settings, can modulate the severity of bleaching and the subsequent survival capacity of corals and hydrocorals after mass bleaching events. However, the complexity of environmental factors interacting over fine-scale spatial-temporal scales is still a major gap in understanding coral bleaching events of South Atlantic reefs.

Tolerance of free-living larval stage of a parasite from coastal mining areas in northern Humboldt Current to copper pollution at low and high temperatures.

Metal pollution is a worldwide problem and one of the greatest threats to ecosystem integrity due to its toxicity, persistence, and bioaccumulation in biological systems. Anthropogenic pollution impacts marine organisms and host-parasite dynamics, with the northern Chilean coast experiencing elevated copper levels in marine waters and sediments due to mining activities. In this study, we assessed the effects of exposure to copper concentrations at low and high-water temperatures on the survival and longevity of the marine parasite Himasthla sp.

Assessment of extracellular polymeric substances production and antioxidant defences in periphytic communities exposed to effluent contaminants.

Periphyton is frequently used in the evaluation of the ecological status of aquatic ecosystems using diatoms as a proxy. However, periphyton has a particularity, the production of extracellular polymeric substances (EPS), which might play a protective role against exposure to harmful environmental contaminants. Effluents originating in wastewater treatment plants (WWTPs) constitute some of the most complex mixtures of contaminants, to which aquatic ecosystems are frequently exposed, often containing tens to hundreds of different chemicals.

Ceratomyxa matosi n. sp. (Myxozoa: Ceratomyxidae) parasitizing the gallbladder of Boulengerella cuvieri (Characiformes: Ctenoluciidae) State of Amapá, Brazilian Amazon.

Myxozoa is a class of the Phylum Cnidaria made up of endoparasites from aquatic habitats. The genus Ceratomyxa preferentially infects marine fish, with the gallbladder being the main site parasitized. This study aimed to describe a new species of Ceratomyxa found in this organ in Boulengerella cuvieri using morphological, morphometric characterization and phylogenetic analysis of 18S rDNA gene sequences.

Widespread occurrence of dissolved oxygen anomalies, aerobic microbes, and oxygen-producing metabolic pathways in apparently anoxic environments.

Nearly all molecular oxygen (O2) on Earth is produced via oxygenic photosynthesis by plants or photosynthetically active microorganisms. Light-independent O2 production, which occurs both abiotically, e.g.

Military rations: Nutritional, sensorial and technological quality and their effects on military physical exercise in extreme environments.

In recent years, many countries have significantly increased military spending, mainly due to geopolitical instability in several regions and the potential risk of armed conflicts spreading worldwide. In this context, understanding the nutritional needs of soldiers in different climates (warm, cold and high altitude) is important and directly impacts the performance and health of soldiers, especially in extreme environments. The amount of liquids, calories, and macro- and micronutrients contained in military rations must be determined considering the type of exercise, duration and environment.

A critical review of model construction and performance for nowcast systems for faecal contamination in recreational beaches.

Faecal contamination is a widespread environmental and public health problem on recreational beaches around the world. The implementation of predictive models has been recommended by the World Health Organization as a complement to traditional monitoring to assist decision-makers and reduce health risks. Despite several advances that have been made in the modeling of faecal coliforms, tools and algorithms from machine learning are still scarcely used in the field and their implementation in nowcast systems is delayed.

Behavioural response to boat noise weakens the strength of a trophic link in coral reefs.

In oceans, the noise generated by human activities has reached phenomenal proportions, with considerable harmful effects on marine life. Measuring this impact to achieve a sustainable balance for highly vulnerable marine ecosystems, such as coral reefs, is a critical environmental policy objective. Here, we demonstrate that anthropogenic noise alters the interactions of a coral reef fish with its environment and how this behavioural response to noise impairs foraging.

Bioaccumulation of trace elements in marine mammals: New data and transplacental transfer on threatened species.

Coastal areas are affected by urban, industrial and agriculture pollutants runoff, wastewater and stormwater discharges, making this environment the final repository of chemical contaminants. These contaminants have the potential to spread out to the entire food chain, impacting marine life and the quality of their habitat. In this aspect, the concept of marine mammals as bioindicators provides an approach to the degree of contamination in the environment and to the identification and management of multiple sources of contaminants.

Innovative monitoring scheme adapted to remote, scattered nesting aggregation reveals a major loggerhead turtle rookery in New Caledonia, South Pacific.

The loggerhead turtle Caretta caretta is a large marine turtle with a cosmopolitan repartition in warm and temperate waters of the planet. The South Pacific subpopulation is classified as 'Critically Endangered' on the IUCN Red List, based on the estimated demographic decline. This precarious situation engages an urgent need to monitor nesting populations in order to highlight conservation priorities and to ensure their efficiency over time.

A metagenomic approach to unveil the association between fecal gut microbiota and short-chain fatty acids in diarrhea caused by diarrheagenic in children.

Diarrheagenic (DEC) is the main cause of diarrhea in children under five years old. The virulence of DEC is tightly regulated by environmental signals influenced by the gut microbiota and its metabolites. Short-chain fatty acids (SCFAs) are the main metabolic product of anaerobic fermentation in the gut, but their role in DEC diarrhea has not yet been established.

Potential effects of the discharge of wastewater treatment plant (WWTP) effluents in benthic communities: evidence from three distinct WWTP systems.

Wastewater treatment plant (WWTP) effluents can be sources of environmental contamination. In this study, we aimed to understand whether effluents of three different WWTPs may have ecological effects in riverine recipient ecosystems. To achieve this, we assessed benthic phytobenthos and macroinvertebrate communities at three different locations relative to the effluent discharge: immediately upstream, immediately downstream and 500-m downstream the effluent discharge.

Expression dynamics of the aplysia abyssovirus.

Two recent studies documented the genome of a novel, extremely large (35.9 kb), nidovirus in RNA sequence databases from the marine neural model Aplysia californica. The goal of the present study was to document the distribution and transcriptional dynamics of this virus, Aplysia abyssovirus 1 (AAbV), in maricultured and wild animals.

Brominated flame retardants and natural organobrominated compounds in a vulnerable delphinid species along the Brazilian coast.

Guiana dolphins, Sotalia guianensis, are vulnerable to extinction along their distribution on the Brazilian coast and assessing chemical pollution is of utmost importance for their conservation. For this study, 51 carcasses of Guiana dolphins were sampled across the Brazilian coast to investigate legacy and emerging brominated flame retardants (BFRs) as well as the naturally-produced MeO-BDEs. PBDEs and MeO-BDEs were detected in all samples analyzed, whereas emerging BFRs were detected in 16 % of the samples, all in Rio de Janeiro state.