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4 results for “Morus bassanus”
Evidence of links between haematological condition and foraging behaviour in Northern gannets (Morus bassanus)
<p><span><span><span><span><span><span><span><span><span><span><span>Haematological analyses can reveal the physiological condition of birds, who are known to efficiently disguise symptoms of stress and disease. However, interpretation of such analyses requires species-specific baseline data, which are lacking for most free-living seabird species. We provide baseline reference data for several haematological parameters in Northern gannets (<i>Morus bassanus</i>) and combine this with telemetry and dietary data to understand the links between haemotologic condition and foraging behaviour. Blood samples were collected from breeding Northern gannets in July 2017 (n = 15) and 2018 (n = 28), which were also equipped with GPS tags. Smears were prepared for performing blood cell counts, including immature erythrocyte and microcyte percentages, total and differential leucocyte counts, heterophil:lymphocyte (H:L) ratio, and total thrombocyte count, the remaining blood was used for stable isotope analysis, and foraging behaviours were inferred from the recovered tag data. Blood cell counts revealed that the sampled birds were highly stressed and some showed an immune response, evident from the abnormal leucocyte counts and H:L ratio. There were no sex-related differences in haematological parameters or diet, in contrast to foraging parameters where females undertook longer trips than males and spent proportionately more time in search behaviours. The percentage time spent actively foraging was negatively correlated with the percentage of eosinophils. While there was no direct link between haematologic condition and diet, one bird feeding at a relatively low trophic level undertook exceptionally short foraging trips and showed abnormal blood cell counts. This suggests a link between haematologic condition and foraging ecology that can be employed in assessing seabird health.</span></span></span></span></span></span></span></span></span></span></span></p>
Estimated mortality of the Highly Pathogenic Avian Influenza (HPAI) pandemic on Northern gannets (Morus bassanus) in southwest Ireland
<p><span>The 2022 Highly Pathogenic Avian Influenza (HPAI) outbreak that occurred in 2022 in many European countries affected several seabird species. Among them, Northern gannets (<em>Morus</em> <em>bassanus</em>), were particularly impacted. We conducted aerial surveys in waters around the two largest gannet colonies in Ireland (Little Skellig and Bull Rock, together representing 87% of the national population) in September 2022. During surveys, 184 dead gannets were recorded on survey effort, representing 3.74% of the total number of gannets recorded. We estimated the abundance of dead gannets in the surveyed area at 1,526 (95% CIs 1,299–1,793) individuals. The percentage of dead gannets observed was used to estimate a minimum local population mortality of 3,118 individuals across both colonies. Aerial surveys proved a reliable methodology providing key information on gannet mortality derived from HPAI at sea. The study provides the first estimate of gannet mortality in the two largest gannetries in Ireland.</span></p>
Evidence of links between haematological condition and foraging behaviour in Northern gannets (Morus bassanus)
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Estimated mortality of the Highly Pathogenic Avian Influenza (HPAI) pandemic on Northern gannets (Morus bassanus) in southwest Ireland
Open the record for dataset details and reuse information.
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