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DNA methylation profile of the Mediterranean fin whale (Balaenoptera physalus) exposed to organochlorine contaminants.

ABSTRACT: DNA methylation profile of the Mediterranean fin whale (Balaenoptera physalus) exposed to organochlorine contaminants.

PROVIDER: PRJNA642896 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR12112791_1.fastq.gz	Fastqsanger.gz
	SRR12112791_2.fastq.gz	Fastqsanger.gz
	SRR12112792_1.fastq.gz	Fastqsanger.gz
	SRR12112792_2.fastq.gz	Fastqsanger.gz
	SRR12112793_1.fastq.gz	Fastqsanger.gz

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DNA methylation profile of the Mediterranean fin whale (Balaenoptera physalus) exposed to organochlorine contaminants.

Project description:We sampled skin and blubber from 6 fin whale (Balenoptera physalus) individuals living in the northern Mediterranean Sea. Blubber was analyzed for Organochlorines levels while genomic DNA extracted from the skin of the animals with the lowest (mean value = 19 µg/g lipid basis, l.b.) (group 1, n=3) and the highest (mean value = 53 µg/g l.b.) (group 2, n=3) levels of contaminants were used for DNAm profiling through reduced representation bisulfite sequencing (RRBS).

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Dolphin Morbillivirus and Toxoplasma gondii coinfection in a Mediterranean fin whale (Balaenoptera physalus).

Project description:BackgroundAlthough Morbillivirus and Toxoplasma gondii have emerged as important pathogens for several cetaceans populations over the last 20 years, they have never been identified together in a Mysticete. In particular, morbilliviral infection has been never described in the Mediterranean fin whale population.Case presentationOn January 2011 an adult male of fin whale (Balaenoptera physalus) stranded along the Tyrrhenian coastline of Italy. During necropsy, tissue samples from heart, skeletal muscle, mesenteric lymph nodes, liver, spleen, lung, and kidney were collected and subsequently analyzed for Morbillivirus and Toxoplasma gondii by microscopic and molecular methods. Following the detailed necropsy carried out on this whale, molecular analysis revealed, for the first time, the simultaneous presence of a Dolphin Morbillivirus (DMV) and T. gondii infection coexisting with each other, along with high organochlorine pollutant concentrations, with special reference to DDT.ConclusionThis report, besides confirming the possibility for Mysticetes to be infected with DMV, highlights the risk of toxoplasmosis in sea water for mammals, already immunodepressed by concurrent factors as infections and environmental contaminants.

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Mediterranean Fin Whales (Balaenoptera physalus) Threatened by Dolphin MorbilliVirus.

Project description:During 2011-2013, dolphin morbillivirus was molecularly identified in 4 stranded fin whales from the Mediterranean Sea. Nucleoprotein, phosphoprotein, and hemagglutinin gene sequences of the identified strain were highly homologous with those of a morbillivirus that caused a 2006-2007 epidemic in the Mediterranean. Dolphin morbillivirus represents a serious threat for fin whales.

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mBalPhy

Project description:Balaenoptera physalus (fin whale), genomic and transcriptomic data

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Temporal evolution of the Mediterranean fin whale song.

Project description:We present an analysis of fin whale (Balaenoptera physalus) songs on passive acoustic recordings from the Pelagos Sanctuary (Western Mediterranean Basin). The recordings were gathered between 2008 and 2018 using 2 different hydrophone stations. We show how 20 Hz fin whale pulses can be automatically detected using a low complexity convolutional neural network (CNN) despite data variability (different recording devices exposed to diverse noises). The pulses were further classified into the two categories described in past studies and inter pulse intervals (IPI) were measured. The results confirm previous observations on the local relationship between pulse type and IPI with substantially more data. Furthermore we show inter-annual shifts in IPI and an intra-annual trend in pulse center frequency. This study provides new elements of comparison for the understanding of long term fin whale song trends worldwide.

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Fin Whale (<i>Balaenoptera physalus</i>) Mortality along the Italian Coast between 1624 and 2021.

Project description:The Mediterranean Sea hosts a population of fin whale (Balaenoptera physalus), the only species of Mysticete regularly occurring in the basin. Observed and inferred mortality suggests that the population is likely declining. Accordingly, understanding the causes of mortality and assessing the health status is pivotal to the survival of this endangered population. While such studies are inherently difficult for a highly roaming species with a pelagic distribution, mortality events provide the opportunity to investigate biological and epidemiological traits linked to these events, and evaluate the footprint of human activity, especially when long-term data series exist. We present a comprehensive spatial-temporal overview of fin whale mortality events along the Italian coast encompassing four centuries (1624-2021). Time series analysis was used to highlight structural changes in the evolution of mortality through time, while spatial-temporal patterns in the distribution of mortality events were assessed through emerging hot spot analysis methods. Recent mortality events (1964-2021) were further explored to evaluate, where possible, the primary causes of mortality and to identify anthropogenic threats of conservation concerns. This long-term survey offers the basis for an understanding of the health status of this B. physalus population and provides much-needed information for developing an effective management and conservation plan for the species in the region.

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