NDLI: Excretion patterns of coccidian oocysts and nematode eggs during the reproductive season in Northern Bald Ibis (Geronticus eremita)

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Excretion patterns of coccidian oocysts and nematode eggs during the reproductive season in Northern Bald Ibis (Geronticus eremita)

Content Provider	Springer Nature Link
Author	Frigerio, Didone Cibulski, Lara Ludwig, Sonja C. Campderrich, Irene Kotrschal, Kurt Wascher, Claudia A. F.
Copyright Year	2016
Abstract	Individual reproductive success largely depends on the ability to optimize behaviour, immune function and the physiological stress response. We have investigated correlations between behaviour, faecal steroid metabolites, immune parameters, parasite excretion patterns and reproductive output in a critically endangered avian species, the Northern Bald Ibis (Geronticus eremita). In particular, we related haematocrit, heterophil/lymphocyte ratio, excreted immune-reactive corticosterone metabolites and social behaviour with parasite excretion and two individual fitness parameters, namely, number of eggs laid and number of fledglings. We found that the frequency of excretion of parasites’ oocysts and eggs tended to increase with ambient temperature. Paired individuals excreted significantly more samples containing nematode eggs than unpaired ones. The excretion of nematode eggs was also significantly more frequent in females than in males. Individuals with a high proportion of droppings containing coccidian oocysts were more often preened by their partners than individuals with lower excretion rates. We observed that the more eggs an individual incubated and the fewer offspring fledged, the higher the rates of excreted samples containing coccidian oocysts. Our results confirm that social behaviour, physiology and parasite burden are linked in a complex and context-dependent manner. They also contribute background information supporting future conservation programmes dealing with this critically endangered species. Ausscheidungsmuster von Kokzidienoozysten und Nematodeneiern während der Fortpflanzungsperiode bei Waldrappen ( Geronticus eremita ) Individueller Fortpflanzungserfolg hängt weitgehend von der Fähigkeit ab, Verhalten, Immunfunktion und die physiologische Reaktion auf Stress zu optimieren. In der vorliegenden Studie untersuchten wir Zusammenhänge zwischen Verhalten, fäkalen Steroidmetaboliten, hämatologischen Parametern, Parasitenausscheidungsmustern und Fortpflanzungserfolg in einer vom Aussterben bedrohten Vogelart, dem Waldrapp (Geronticus eremita). Insbesondere untersuchten wir Zusammenhänge zwischen ausgeschiedenen immunoreaktiven Corticosteronmetaboliten, dem Verhältnis von Heterophilen zu Lymphozyten, Hämatokrit und dem Sozialverhalten mit der Menge ausgeschiedener Parasiten und mit Fitness-Parametern, wie der Anzahl der gelegten Eier und der flügge gewordenen Jungvögel. Die Anzahl der Kotausscheidungen, die Parasiteneier enthalten, steigt tendenziell mit der Umgebungstemperatur. Verpaarte Vögel schieden deutlich öfter Kot mit Nematodeneiern aus, als Unverpaarte. Zudem enthielt der Kot der Weibchen signifikant öfter Nematodeneier, als der der Männchen. Individuen mit einem hohen Anteil an Kokzidienoozysten im Kot wurden häufiger von ihren Partnern gekrault, als Individuen mit geringeren Ausscheidungsraten. Je mehr Eier ein Individuum während der Brutzeit ausbrütete, und je weniger Nachwuchs flügge wurde, desto höher war die Rate von mit Kokzidienoozysten befallenen Proben. Unsere Ergebnisse bestätigen, dass Sozialverhalten, Physiologie und Parasitenbelastung in einer komplexen Weise miteinander verbunden sind. Darüber hinaus unterstützt die vorliegende Studie das Management dieser vom Aussterben bedrohten Vogelart.
Starting Page	839
Ending Page	851
Page Count	13
File Format	PDF
ISSN	21937192
Journal	Journal für Ornithologie
Volume Number	157
Issue Number	3
e-ISSN	21937206
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2016-02-04
Publisher Place	Berlin, Heidelberg
Access Restriction	Subscribed
Subject Keyword	Parasite burden Northern Bald Ibis Geronticus eremita Reproduction Zoology Ecology Fish & Wildlife Biology & Management
Content Type	Text
Resource Type	Article

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Excretion patterns of coccidian oocysts and nematode eggs during the reproductive season in Northern Bald Ibis (Geronticus eremita)

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Excretion patterns of coccidian oocysts and nematode eggs during the reproductive season in Northern Bald Ibis (Geronticus eremita)

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