Christian Willisch

Christian Willisch
Bern University of Applied Sciences | BFH · Department of Agriculture Forestry, Food Science & Management

PhD
Group Leader Wildlife Ecology

About

28
Publications
6,142
Reads
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351
Citations
Citations since 2016
9 Research Items
191 Citations
2016201720182019202020212022010203040
2016201720182019202020212022010203040
2016201720182019202020212022010203040
2016201720182019202020212022010203040
Introduction
Research on Alpine ungulates and large carnivores in the fields of behavioral ecology, population dynamics and demography, habitat ecology, human impact, monitoring and telemetry techniques.

Publications

Publications (28)
Article
Full-text available
According to life-history theory age-dependent investments into reproduction are thought to co-vary with survival and growth of animals. In polygynous species, in which size is an important determinant of reproductive success, male reproduction via alternative mating tactics at young age are consequently expected to be the less frequent in species...
Article
Secondary sexual traits in males of polygynous species are important determinants of reproductive success. It is, however, unknown if and how the development of continuously growing traits at different life-stages is related to reproduction in long-lived male mammals. In this study, we evaluated the relationship of early and late horn growth on soc...
Technical Report
Full-text available
Rupicapra rupicapra - IUCN reassessment 2020
Article
Footrot is a worldwide economically important, debilitating disease caused by Dichelobacter nodosus. In sheep (Ovis aries), it is characterized by lesions of varying severity, depending on the strain, whereas Alpine ibex (Capra ibex) seem to develop severe lesions, whatever the strain. Healthy carriers occur in livestock but are rare in wild rumina...
Article
Full-text available
Trade-offs between reproductive effort and subsequent growth in males are not well explored, despite their relevance in questions of individual energy allocation. Regarding the growth of sexual secondary characters in polygynous breeding male mammals, indeed, no conclusive studies exist. We investigated in male Alpine ibex ( Capra ibex ) the relati...
Technical Report
Leitfaden zum Monitoring von Wildhuftieren. Herausgeber: AG Wildhuftiere, Schweizerische Gesellschaft für Wildtierbiologie SGW Layout: Claude Andrist, Wildtier Schweiz publiziert auf: https://mitglied.scnat.ch/sgw-ssbf/uuid/i/efa11827-3432-5984-b945-0a4da1865b57-SGW-Leitfaden_Monitoring_Wildhuftiere
Chapter
Artkapitel zu Rothirsch (Cervus elaphus) In Graf, R.F. & Fischer C. (eds). 2021 Atlas der Säugetiere. Schweiz und Liechtenstein. Erhältlich in d/f/i
Chapter
Artkapitel zum Alpensteinbkc (Capra ibex) In Graf, R.F. & Fischer C. (eds). 2021 Atlas der Säugetiere. Schweiz und Liechtenstein. Erhältlich in d/f/i
Chapter
Artkapitel zu Gämse (Rupicapra rupicapra). In Graf R.F. & Fischer C. (eds) 2021. Atlas der Säugetiere. Schweiz und Liechtenstein. Erhältlich in d/f/i
Article
Full-text available
The return of the wolf to the Swiss Alps often leads to conflicts with the resident human population. Especially owners of small livestock are affected, as they summer their animals in the habitat of wolves. Experience shows that wolves can cause considerable losses among unprotected herds. To make the coexistence of wolves and small livestock poss...
Article
Full-text available
Die Rückkehr des Wolfes in die Alpen führt häufig zu Konflikten mit der örtlichen Bevölkerung. Speziell betroffen sind Halter von kleinen Wiederkäuern, welche ihre Tiere im Lebensraum der Wölfe sömmern. Erfahrungen zeigen, dass Wölfe bei ungeschützten Kleinwiederkäuerherden grosse Verluste verursachen können. Um ein Nebeneinander von Wolf und Klein...
Article
The acquisition of accurate information on the size of traits in animals is fundamental for the study of animal ecology and evolution and their management. We demonstrate how morphological traits of free-ranging animals can reliably be estimated on very large observation distances of several hundred meters by the use of ordinary digital photographi...
Article
Full-text available
Because of a rapidly changing climate, the need to understand how populations respond to varying climatic conditions has become increasingly important. Using long-term data from an unhunted population of Alpine chamois (Rupicapra rupicapra) and autoregressive time series models we investigated the extent to which the population demography was affec...
Article
To provide baseline parasitological data for health surveillance in free-ranging Alpine ibex (Capra ibex ibex), we assessed the endoparasite population and level of parasitism in apparently healthy ibex. Faecal samples from 148 ibex were collected between 2006 and 2008 in two different Swiss ibex colonies. They were analysed by coprology, including...
Article
Full-text available
In the early 2000s, several colonies of Alpine ibex (Capra ibex ibex) in Switzerland ceased growing or began to decrease. Reproductive problems due to infections with abortive agents might have negatively affected recruitment. We assessed the presence of selected agents of abortion in Alpine ibex by serologic, molecular, and culture techniques and...
Article
Full-text available
In polygynous ungulates, male mortality is thought to be linked to high-energy expenditures during the rut. However, Alpine ibex (Capra ibex) adult males show an unusually high survival during this time. Male Alpine ibex live in social groups and thus, we assumed that they might reduce energy-intensive interactions during the rut by establishing, e...
Article
Full-text available
Adult male Alpine ibex (Capra ibex ibex) have been shown to exhibit unusually high survival to relatively advanced ages (.10 years), leading to speculation that males may engage in an energetically conservative reproductive strategy that increases survival. We investigated the extent to which the adoption of alternative mating tactics contributes t...
Thesis
Full-text available
Since basic information on reproductive behaviour in male Alpine ibex was lacking, I provided in chapter 1, first a detailed description of the mating system and the two alternative mating tactics in this species. I investigated to which extent the adoption of these observed mating tactics in male Alpine ibex can contribute to the exceptional survi...
Article
Full-text available
Mycoplasma conjunctivae is considered the major cause of infectious keratoconjunctivitis (IKC) in Alpine ibex (Capra i. ibex) and chamois (Rupicapra r. rupicapra). While it is known that domestic sheep can act as healthy carriers for M. conjunctivae, this question has not been addressed in wild ungulates so far. In this study, bacteriological inves...
Article
Optimal foraging theory suggests that animals normally maximize energy intake to optimize their energy balance. However, when efficiency to assimilate energy falls below the level necessary to ascertain basal energetic requirements, they should shift to an energy saving strategy. Males of many ruminant species considerably reduce their food intake...

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Cited By

Projects

Projects (3)
Project
To better understand how red deer (Cervus elaphus) can sustain in human-dominated landscapes.
Project
To improve our understanding of Alpine chamois (Rupicapra rupicapra) ecology.
Project
To imporve our understanding of the ecology of Alpine ibex (Capra ibex).