Data sheets & metadata for "When Introduced Prey Violates Trophic Hierarchy: Conservation of an Endangered Predator"

Research objectives:
• Management of long-established invasive species is complicated when endangered species use the invasive species as resource.
• Understanding predator-prey interactions between natives and invasives can help improve conservation of endangered predators.
• Understanding demographic response of endangered predators following invasive species control can help improve management regimes.
• Some populations of the endangered San Francisco gartersnake co-occur with introduced bullfrogs, and the two predators potentially engage in reciprocal intraguild predation. This study explores the degree to which bullfrogs affect San Francisco gartersnakes through predation and competition. This study also explores how removal of bullfrogs can affect the demography of a San Francisco gartersnake population (site-specific analyses).

Notable findings & interpretation:
• San Francisco gartersnakes display reciprocal intraguild predation with invasive bullfrogs; competition, rather than predation, dominated the predator-invader interaction (see "diet patterns" and "diet overlap" data files).
• Despite a potentially low frequency of predation by adult bullfrogs on juvenile San Francisco gartersnakes, juvenile snakes could remain vulnerable to bullfrog predation for a few years (see "abdominal scale measurement" data files).
• Invasive prey removal was followed by an increase in native predator recruitment (see "capture-mark-recapture" data files).
• Integrating diet studies and demographic studies of target species, following field-removal of invaders, can inform how to improve management decisions for conservation of endangered species and removal of invasive species.