Journal
JOURNAL OF VETERINARY MEDICAL SCIENCE
Volume 82, Issue 11, Pages 1619-1626Publisher
JAPAN SOC VET SCI
DOI: 10.1292/jvms.20-0339
Keywords
CD4; CD8a; Chroicocephalus ridibundus; immunological measurements; migration period
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Funding
- Sasakawa Scientific Research Grant from The Japan Science Society
- Environment Research and Technology Development Fund of the Environmental Restoration and Conservation Agency of Japan [SII-1]
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In order to elucidate the relationship between migration period and immunity related to susceptibility, we conducted research on Black-headed gulls (Chroicocephalus ridibundus). We captured 260 gulls and collected their peripheral blood. Their leukocyte (WBC) count, percentages of heterophils (Het) and lymphocytes (Lym), heterophil and lymphocyte ratio (H/L ratio), and CD4 and CD8 alpha expression levels (CD4 and CD8 alpha, respectively) were quantitatively analyzed over three migration periods (Autumn migration, Wintering, Spring migration). In Adult gulls, WBC counts and CD4 levels significantly increased. Moreover, the Het and H/L ratio decreased from the Autumn migration to Wintering. Conversely, only WBC counts and CD4 levels measurements significantly decreased from Wintering to Spring migration (P<0.05). The tested parameters of the Tokyo-bay population show a greater significant difference than the measurements of immunity of the Mikawa-bay population. This study suggests that the migratory period has a negative effect on an aspect of the immune system. Including the period-difference in the immune systems in the local population, it is necessary to investigate the relationship between the ecology of migratory birds and their immunity.
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