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Temporal variation in translocated Isle Royale wolf diet.

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Wolf foraging patterns shift seasonally, with moose consumed more in spring and summer, while beavers remain a consistent food source. This dietary flexibility influences wolf ecological impact and community stability.

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Area of Science:

  • Ecology
  • Wildlife Biology
  • Predator-Prey Dynamics

Background:

  • Wolves (Canis lupus) are keystone predators influencing ecosystem structure through predation.
  • Understanding wolf foraging strategies is crucial for assessing their ecosystem-level impacts.
  • Predator foraging decisions are influenced by trade-offs between prey acquisition costs and benefits, which can vary temporally.

Purpose of the Study:

  • To describe the wolf diet on Isle Royale National Park by analyzing prey remains in scats.
  • To investigate how temporal variations in prey vulnerability and availability affect wolf diet composition.
  • To understand the implications of wolf dietary flexibility for ecological community stability.

Main Methods:

  • Analysis of 206 wolf scats collected from May-October 2019 and 2020.
  • Quantification of diet by frequency of occurrence and percent biomass of prey remains.
  • Logistic regression used to model temporal trends in prey consumption.

Main Results:

  • Beaver (Castor spp.) constituted 62% of the diet, moose (Alces alces) 26%, and other species 12%.
  • Adult moose were more frequent in scats in May; moose calves peaked in June-July.
  • Beaver occurrence in wolf scats remained consistent throughout the study period.

Conclusions:

  • Wolf diet composition is responsive to seasonal changes in prey availability and vulnerability.
  • The consistent consumption of beavers highlights their importance as a low-handling cost prey for wolves.
  • Temporal fluctuations in wolf diet can influence their ecological role and impact prey behavior, potentially affecting community stability.