Ståhlberg, Sophie (2014) Northern and Southern European grey wolf (Canis lupus) prey choice, role as the Keystone species in a scavenger community and activity pattern. Doctoral Thesis.
|Full text disponibile come PDF Richiede visualizzatore di PDF come GSview, Xpdf o Adobe Acrobat Reader|
Grey wolf is an elusive predator, highly adaptable and capable of adjusting to different ecological conditions.
I studied prey choice of wolf in Scandinavia and Tuscany and looked at variances between territories
within the two study areas. I used analysis of scats collected during a period of nine year in Scandinavia
and four years in Tuscany.
I found greater habitat heterogeneity in Tuscany which leads to a more complex predator-prey
structure. In Scandinavia seasonal prey type choice was more dynamic; reasons may be related to the
fact that highly exploited forestry industry in Sweden disabled rich ecological diversity. The Tuscan
Apennines has been depopulated as abandoned agriculture allows re-forestation and ungulate species
abundance to increase.
I did a movement triggered camera study of the scavenger guild in wolf territories feeding on carcasses
and analysed 24 h and seasonal activity patterns. I also looked at anti-predator behavior in intra-guild
members using these feeding sites. I discovered in both the diet and the camera studies that there was no avian prey in the wolf diet, nor avian scavengers at the carcass sites in Tuscany.
There is a trade-off between time spent feeding and anti-predator behavior. I quantified the level of
vigilance in scavenger species and compared safety investment by vigilance behavior in Tuscan and
Swedish scavengers, specifically red fox and marten. I found that martens in Tuscany feed more and
invests less in anti-predator behavior.
I documenti depositati in UnissResearch sono protetti dalle leggi che regolano il diritto d'autore
Repository Staff Only: item control page