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Title: Sometimes sperm whales (physeter macrocephalus) cannot find their way back to the high seas: A multidisciplinary study on a mass stranding
Authors: Mazzariol, Sandro
Guardo, Giovanni Di
Petrella, Antonio
Marsili, Letizia
Fossi, Maria Cristina
Leonzio, Claudio
Zizzo, Nicola
Vizzini, Salvatrice
Gaspari, Stefania A.
Pavan, Gianni
Podestà, Michela
Garibaldi, Fulvio
Ferrante, Margherita
Copat, Chiara
Traversa, Donato
Marcer, Federica
Airoldi, Sabina
Frantzis, Alexandros
Bernaldo De Quirós Miranda, Yara 
Cozzi, Bruno
Fernández Rodríguez, Antonio Jesús 
UNESCO Clasification: 240119 Zoología marina
240118 Mamíferos
3109 Ciencias veterinarias
Keywords: Polycyclic Aromatic-Hydrocarbons
Genetic Diversity
Marine Mammals
Methyl Mercury, et al
Issue Date: 2011
Journal: PLoS ONE 
Abstract: Background: Mass strandings of sperm whales (Physeter macrocephalus) remain peculiar and rather unexplained events, which rarely occur in the Mediterranean Sea. Solar cycles and related changes in the geomagnetic field, variations in water temperature and weather conditions, coast geographical features and human activities have been proposed as possible causes. In December 2009, a pod of seven male sperm whales stranded along the Adriatic coast of Southern Italy. This is the sixth instance from 1555 in this basin. Methodology/Principal Findings: Complete necropsies were performed on three whales whose bodies were in good condition, carrying out on sampled tissues histopathology, virology, bacteriology, parasitology, and screening of veins looking for gas emboli. Furthermore, samples for age determination, genetic studies, gastric content evaluation, stable isotopes and toxicology were taken from all the seven specimens. The animals were part of the same group and determined by genetic and photo-identification to be part of the Mediterranean population. Causes of death did not include biological agents, or the "gas and fat embolic syndrome", associated with direct sonar exposure. Environmental pollutant tissue concentrations were relatively high, in particular organochlorinated xenobiotics. Gastric content and morphologic tissue examinations showed a prolonged starvation, which likely caused, at its turn, the mobilization of lipophilic contaminants from the adipose tissue. Chemical compounds subsequently entered the blood circulation and may have impaired immune and nervous functions. Conclusions/Significance: A multi-factorial cause underlying this sperm whales' mass stranding is proposed herein based upon the results of postmortem investigations as well as of the detailed analyses of the geographical and historical background. The seven sperm whales took the same "wrong way" into the Adriatic Sea, a potentially dangerous trap for Mediterranean sperm whales. Seismic surveys should be also regarded as potential co-factors, even if no evidence of direct impact has been detected.
ISSN: 1932-6203
DOI: 10.1371/journal.pone.0019417
Source: PLoS ONE [ISSN 1932-6203], v. 6 (5), (e19417)
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