Sammanfattning

Large carnivores play a key ecological role in nature, yet quantifying the effects of predation at large spatiotemporal scales remains challenging. Wolves and brown bears have recovered in Sweden, where they share the same staple prey, moose. This ecosystem is representative of the Eurasian boreal realm, and makes an interesting case study for exploring the use of hunter-collected observation data to understand the ecological effects of large carnivore recovery in human-dominated ecosystems. We used over 50 million hours of moose observation data collected by "citizen scientists" (i.e., moose hunters) between 2000 and 2017 to evaluate the role of recovering bear and wolf populations on an important ungulate vital rate, calf/cow ratio (the number of observed calves per female in fall). Calf/cow ratios were negatively correlated with both wolf and bear densities, suggesting that summer calf survival decreased via predation. Calf/cow ratios decreased by 7% and 17% in the northern and southern areas where bears and wolves were allopatric, respectively. Where wolves and bears were sympatric, the effect of predator densities was additive; calf/cow ratios decreased by 18%. However, both calf/cow ratios and moose densities declined over the last similar to 20 years across Sweden, including areas where wolves and bears were absent. While recolonizing large carnivores affected ungulate vital rates in Sweden's human-dominated landscape, they were likely not the primary driver of long-term moose population trends. Our results reinforce that citizen-collected data are a useful wildlife monitoring tool that help understand ecological processes, including the effects of recovering carnivores on prey populations. (C) 2021 The Authors. Published by Elsevier B.V.

Nyckelord

Brown bear; Calf/cow ratio; Carnivore recovery; Predator-prey interactions; Wolf

Publicerad i

Global Ecology and Conservation
2021, Volym: 27, artikelnummer: e01587
Utgivare: ELSEVIER

SLU författare

• Sand, Håkan

  • Institutionen för ekologi, Sveriges lantbruksuniversitet
    

• Wikenros, Camilla

  • Institutionen för ekologi, Sveriges lantbruksuniversitet
    

• Bergqvist, Göran

  • Institutionen för sydsvensk skogsvetenskap, Sveriges lantbruksuniversitet
    
  • Svenska Jägareförbundet

• Kindberg, Jonas

  • Institutionen för vilt, fisk och miljö, Sveriges lantbruksuniversitet
    
  • Norwegian Institute for Nature Research (NINA)

UKÄ forskningsämne

Ekologi


Publikationens identifierare

DOI: https://doi.org/10.1016/j.gecco.2021.e01587

Permanent länk till denna sida (URI)

https://res.slu.se/id/publ/112711