Gray wolf mortality patterns in Wisconsin from 1979 to 2012

Area of Science:

• Wildlife ecology and conservation biology
• Mammalian carnivore population dynamics
• Human-wildlife conflict and management

Background:

• Large carnivore populations are recovering from historical declines.
• Human-caused mortality, particularly poaching, hinders recovery.
• Accurate assessment of mortality is crucial for effective conservation.

Purpose of the Study:

• To quantify mortality causes in Wisconsin's recovering gray wolf (Canis lupus) population.
• To identify and address biases in reported mortality data.
• To inform anti-poaching strategies and conservation policies.

Main Methods:

• Analysis of necropsy reports for 937 Wisconsin gray wolves (1979-2012).
• Reconstruction of unreported and underreported wolf deaths.
• Estimation of mortality rates for monitored versus unmonitored wolves.

Main Results:

• Human causes accounted for approximately two-thirds of gray wolf deaths.
• Poaching was the primary cause of human-induced mortality (39-45%).
• Unreported deaths constituted over two-thirds of annual mortality, with significant underreporting of poaching.

Conclusions:

• Gray wolf population recovery is threatened by high levels of human-caused mortality, especially poaching.
• Current anti-poaching enforcement is hampered by underestimation of poaching rates.
• Independent scientific review and accurate data are essential for effective gray wolf conservation and management.