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| Content Provider | Springer Nature Link |
|---|---|
| Author | Lèche, A. Vera Cortez, M. Della Costa, N. S. Navarro, J. L. Marin, R. H. Martella, M. B. |
| Copyright Year | 2015 |
| Abstract | Translocation is an extensively used conservation tool that involves exposing animals to stressful situations that may influence the post-release survival. In this study, 20 Greater Rhea (Rhea americana) adults hatched and reared in captivity were translocated to a wildlife refuge. After transport and before release, animals were kept in pens at the liberation site to make a “soft-release” strategy. Fecal glucocorticoid metabolites (FGM) were monitored during pre-transportation, post-transportation and pre-release, and post-release phases as an indicator of the stress of translocation and acclimation to the new environment. During pre-transportation phase, FGM levels found were consistent with the baseline concentrations described for this species for males and females, respectively. On day 1 after transportation, FGM levels were increased in both sexes, returning to baseline values during the maintenance in the pens. Although the handling and transportation triggered an acute stress response, the procedures used and the soft release in pens allowed Rheas to reestablish quickly baseline FGM levels. After release into the novel wildlife refuge, FGM levels were increased again and remained similarly increased during the following 2 months of the study. Findings suggest a strong chronic stress response, probably triggered by a combination of many factors (i.e. novelty, attacks from predators, social interactions, human related disturbances such as poaching, vehicular noise, hunting dogs) that may reduce the bird’s ability to solve new challenging situations, especially the illegal hunting pressure that seems to be a significant threat in this species. Bewertung der Stress-Reaktion auf die Umsiedlung von in Gefangenschaft aufgezogenen Nandus ( Rhea americana ) ins Freiland.Im Naturschutz werden Umsiedlungen häufig vorgenommen und stellen für die betroffenen Tiere stets einen besonderen Stress dar, der möglicherweise einen Einfluss auf ihr Überleben nach der Umsiedlung hat. In unserer Untersuchung wurden 20 adulte, in Gefangenschaft geschlüpfte und aufgezogene Nandus in ein Naturschutzgebiet umgesiedelt. Nach dem Transport, aber vor ihrer Freilassung, wurden die Tiere im Sinne einer „sanften Freilassung“zunächst noch in Gehegen innerhalb des Naturschutzgebiets gehalten. In den Phasen „vor Transport“, „nach Transport“, „vor Freilassung“und „nach Freilassung“wurden fäkale Glukococorticoid-Metaboliten (FGM) als Indikatoren für den Stress durch den Transport und durch das Einleben in die neue Umgebung gemessen Die FGM-Konzentrationen in der Phase vor dem Transport entsprachen den für beide Geschlechter bereits bekannten Basiswerten. Am Tag 1 nach dem Transport waren die Werte für beide Geschlechter erhöht, gingen aber während des Aufenthalts in den Gehegen wieder auf die Basiswerte hinunter. Obwohl das Einfangen und der Transport bei den Tieren eine akute Stress-Antwort auslösten, bewirkten die eingesetzten Methoden und die „sanfte Freilassung“in die Gehege, dass die Tiere ihre Basis-FGM-Konzentrationen rasch wieder einstellten. Nach der endgültigen Freilassung in das für sie neue Naturschutzgebiet stiegen die FGM-Werte wieder an und blieben danach noch zwei Monate lang auf dem erhöhten Niveau. Diese Ergebnisse weisen auf eine intensive Stress-Antwort hin, die von der Kombination vieler Faktoren (neue Umgebung, Angriffe durch Räuber, soziale Interaktionen, Störungen durch Menschen wie z.B. Wilderei, Fahrzeuglärm, streunende Hunde) getriggert wird und eventuell die Fähigkeit der Vögel vermindert, neuen Herausforderungen erfolgreich zu begegnen, vor allem der illegalen Jagd, die gerade für diese Art eine ganz besondere Bedrohung darstellt. |
| Starting Page | 599 |
| Ending Page | 607 |
| Page Count | 9 |
| File Format | |
| ISSN | 21937192 |
| Journal | Journal für Ornithologie |
| Volume Number | 157 |
| Issue Number | 2 |
| e-ISSN | 21937206 |
| Language | English |
| Publisher | Springer Berlin Heidelberg |
| Publisher Date | 2015-12-21 |
| Publisher Place | Berlin, Heidelberg |
| Access Restriction | Subscribed |
| Subject Keyword | Translocation Stressors Fecal glucocorticoid metabolites Non-invasive monitoring Near threatened species Ratite Zoology Ecology Fish & Wildlife Biology & Management |
| Content Type | Text |
| Resource Type | Article |
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