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Diseases of Aquatic Organisms

    DAO prepress abstract   -  DOI: https://doi.org/10.3354/dao03527

    Ingestion of foreign materials by odontocetes along the Catalan Coast: causes and consequences

    A. Lacombe, E. Pintado, A. O’Byrne, A. Allepuz, L. Pérez-Rodriguez, M. Domingo*

    *Corresponding author:

    ABSTRACT: Ingestion of abnormal materials by cetaceans has been reported worldwide, but few studies have investigated the causes of foreign material ingestion. We retrospectively analysed necropsies performed from 2012 to 2019 on stranded cetaceans on the coast of Catalonia (n=88) and evaluated the association of abnormal ingested materials with two risk factors, disease of the central nervous system (CNS) and maternal separation. Abnormal materials were found in the digestive tract in 19 of 88 (21.6%) cetaceans, with 13 of them (60%) having lesions in the CNS, such as morbilliviral encephalitis, neurobrucellosis, or encephalomalacia, and 3 of them diagnosed as maternal separation. In a logistic regression model, CNS lesions and maternal separation were identified as risk factors for ingestion of foreign material, but with wide confidence intervals, probably due to the small sample size. In contrast, abnormal ingestion was not identified in any of the 25 (28%) cetaceans with human interaction as the cause of death. Abnormal ingestion should be interpreted with caution, and efforts should be made at necropsy to exclude CNS diseases through pathologic and microbiologic investigations. If disease of the CNS is a significant risk factor for ingestion of marine debris by small odontocetes, results of monitoring programs may be biased by the prevalence of CNS disease in a specific area or population.