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| Content Provider | Springer Nature Link |
|---|---|
| Author | Krams, Indrikis Suraka, Valērija Rattiste, Kalev Āboliņš Ābols, Mikus Krama, Tatjana Rantala, Markus J. Mierauskas, Pranas Cīrule, Dina Saks, Lauri |
| Copyright Year | 2012 |
| Abstract | Blood parasites often incur a substantial fitness cost to the infected individuals, sometimes resulting in death of the host. Some bird species, however, are apparently free of blood parasites, presumably due to the lack of exposure to blood parasite vectors. Protective immunity may be also responsible for the absence of infections by haematozoa. In this study, we tested the presence of blood parasites in Common Gulls (Larus canus) and Black-headed Gulls (Chroicocephalus ridibundus) nesting in environments with varying vector exposure. We failed to find blood parasites in Common Gulls irrespective of vector exposure, whereas infection rates of Black-headed Gulls were generally very low. We propose that the absence of haematozoa and low prevalence of blood parasites in these species of gulls is probably not a function of vector exposure and suggest alternative explanations such as enhanced immunity. Vergleichende Analysen zeigen eine möglicherweise mit dem Immunsystem zusammenhängende Abwesenheit von Blutparasiten bei Sturmmöwen ( Larus canus ) und Lachmöwen ( Chroicocephalus ridibundus ) Blutparasiten bedingen oft substantielle Fitness-Aufwendungen für die betroffenen Individuen, die nicht selten zum Tod des Wirts führen. Manche Vogelarten sind jedoch offensichtlich frei von Blutparasiten, vermutlich deshalb, weil sie deren Überträgern nicht ausgesetzt sind. Diese Art von schützender Immunität ist wahrscheinlich auch dafür verantwortlich, dass es bei ihnen keine durch Hämatozoen bedingte Infektionen gibt. In unserer Studie untersuchten wir das Vorhandensein von Blutparasiten bei Sturm- und Lachmöwen, die ihre Nester in Umgebungen gebaut hatten, in denen sie in unterschiedlicher Weise einer möglichen Übertragung der Parasiten ausgesetzt waren. Unabhängig davon, wie sehr sie einer möglichen Übertragung ausgesetzt waren, konnten wir bei den Sturmmöwen gar keine Blutparasiten nachweisen, und bei den Lachmöwen war die Infektionsrate durchweg sehr niedrig. Wir vermuten deshalb, dass bei diesen Vogelarten das Fehlen von Hämatozoen und die geringe Verbreitung von Blutparasiten nicht davon abhängen, ob und wie sehr sie den Überträgern ausgesetzt sind. Stattdessen vermuten wir hier andere Erklärungen wie z. B. ein stärkeres Immunsystem. |
| Starting Page | 1245 |
| Ending Page | 1252 |
| Page Count | 8 |
| File Format | |
| ISSN | 21937192 |
| Journal | Journal für Ornithologie |
| Volume Number | 153 |
| Issue Number | 4 |
| e-ISSN | 21937206 |
| Language | English |
| Publisher | Springer-Verlag |
| Publisher Date | 2012-05-19 |
| Publisher Place | Berlin, Heidelberg |
| Access Restriction | Subscribed |
| Subject Keyword | Blood parasites Gulls Ecological immunology Haematozoa Lack of parasites Zoology Evolutionary Biology Animal Ecology |
| Content Type | Text |
| Resource Type | Article |
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