Details

Autor(en) / Beteiligte

• Golding, Jessie D.
• Davis, Cory R.
• Lamar, Luke
• Tomson, Scott
• Lewis, Carly
• Pilgrim, Kristy
• Ruby, Mark
• Mayernik, Mike
• Mckelvey, Kevin

Titel

Targeted efforts are more effective than combined approaches for sampling two rare carnivores

Ist Teil von

• Wildlife Society bulletin (2011), 2022-09, Vol.46 (4), p.n/a

Erscheinungsjahr

2022

Quelle

Wiley-Blackwell Journals

Beschreibungen/Notizen

• Verifying the abundance and distribution of species of conservation concern is necessary for land management agencies to determine potential impacts of management actions and for monitoring long‐term population trends. In the Rocky Mountains of the United States, Canada lynx (Lynx canadensis) and wolverine (Gulo gulo) are currently species of management importance for federal land management agencies. Optimal winter methods for detecting the 2 species differ in that wolverines are generally detected using bait stations and lynx are most efficiently detected through snow‐track encounters. There has been interest in value‐added approaches such as observing track encounters while traveling to and from bait stations, to improve multispecies detection probabilities. To estimate the value of adding a track survey to bait station travel (referred to as en route surveys) compared to a stand‐alone snow track survey, we conducted both types of surveys in an area where bait stations were located in western Montana, known as the Southwestern Crown of the Continent, from 2013–2016. We collected genetic data (backtracking to genetic material once a track was encountered) and recorded the distance surveyed from both types of track surveys. Our results showed that stand‐alone track surveys were more efficient for detecting lynx than en route surveys in 2015 and 2016 and that there was no difference in track survey efficacy for wolverines across all survey years. In addition, for wolverine, both types of track surveys detected only 3 additional individuals not identified from bait stations (33 individuals total), suggesting that bait stations were the more effective method to detect wolverines. The opposite was true for lynx, with only 5 of 39 individuals identified during the study detected only from bait stations and not by track surveys (4 males and 1 female). In addition, distance surveyed during track surveys was a significant predictor of detection for both species. Our results suggest that ecology and behavior should be considered when designing noninvasive surveys for multiple target species and that complimentary and concurrent, but separate, efforts are likely more efficient for detecting species with differences in ecology and behavior. Conducting snow track surveys for Canada lynx and wolverine while traveling to multispecies bait stations does not provide more effective detections than separate, targeted survey efforts. Instead, detections for each species are more quickly obtained per unit effort relative to the method best at detecting each species (i.e., stand‐alone track surveys for Canada lynx and multispecies bait stations for wolverines).