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High prevalence and low intensity of Echinophthirius horridus infection in seals revealed by high effort sampling
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High prevalence and low intensity of Echinophthirius horridus infection in seals revealed by high effort sampling
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Journal Article
High prevalence and low intensity of Echinophthirius horridus infection in seals revealed by high effort sampling
2024
Overview
Seal lice (
Echinophthirius horridus
) are bloodsucking ectoparasites of phocid seals and vectors of pathogens like the heartworm,
Acanthocheilonema spirocauda
. Grey and harbour seal populations are recovering in German waters and wildlife health surveillance is crucial for wildlife conservation. A new, high effort sampling protocol for seal lice was applied for grey and harbour seals along the German North- and Baltic Sea coast. Freshly dead seals were systematically sampled within a health monitoring of stranded seals over 12 months. Prevalence, intensity and distribution patterns of seal lice were analysed. 58% of harbour seals (
n
= 71) and 70% of grey seals (
n
= 10) were infected with seal lice. A majority of harbour seals displayed mild levels of infection, while three were moderately and two were severely infected. The head was the preferred predilection site, indicating that
E. horridus
prefers body areas with frequent access to atmospheric oxygen. Nits and different developmental stages were recorded in all age classes in grey and harbour seals in all seasons. For the first time, copulating specimens of
E. horridus
were recorded on a dead harbour seal, highlighting that
E. horridus
reproduces throughout the year on seals of all age classes in German waters.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
