Abstract
Context
Carnivores influence the spatial heterogeneity of biogeochemical processes in ecological communities through predation and the deposition of animal carcasses, and these processes may lead to positive feedback loops that influence large-scale patterns of nutrient cycling.
Objectives
We assessed whether ambush predator foraging impacted soil chemistry and plant forage quality, and then scaled these effects to the landscape to assess whether carnivores contribute to heterogeneity in resource distributions.
Methods
We measured total nitrogen (N) and N stable isotope composition (δ15N) of soils and plants at 172 ungulate carcasses killed by mountain lions in the Yellowstone Ecosystem, USA. We measured kill rates and estimated the probability of a mountain lion foraging in any location to scale their carrion contributions to the landscape.
Results
Carcasses altered total nitrogen N and δ15N of soils and plants, and changes in δ15N suggested that plants absorbed significant N from carcasses. On average, plant δ15N at kill sites increased by 2.3 milles (‰), which is large compared to the 6.3 ‰ range of variation in local plants across xeric and mesic systems. We conservatively estimated that resident mountain lions in our study area annually contributed the carrion mass of a blue whale, or 44.1 kg of carrion and 1.4 kg of N per km2. We also determined that mountain lion foraging was concentrated in just 4% of our study system.
Conclusions
Ambush carnivore foraging may contribute to landscape-scale heterogeneity in nutrient distributions, and set the stage for positive feedback loops between carnivores and prey that drive biogeochemical processes.
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Data availability
The data are archived in the following archive: https://figshare.com/s/eb800917542576038c1d.
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Acknowledgements
We would like to thank the numerous field technicians and private individuals who contributed to this work. Research was supported by the Summerlee Foundation, Kaplan Graduate Award, Gerry and Meriam Scully, the National Geographic Society (grant no. C236–13), the Community Foundation of Jackson Hole and the Harold Nyberg Endowed Scholarship and in part by the USDA National Institute of Food and Agriculture, McIntire-Stennis Project 1018967.
Funding
Summerlee Foundation, National Geographic Society, C236–13.
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MP and LME conceptualized the project and conducted the fieldwork. LME funded and managed the field project. LAS and RDE provided lab resources, mentoring in lab methods and interpreting results. DHT was primary responsible for graduate student support and guidance, including internal funding. MP, LME and DHT drafted the manuscript and all authors provied feedback and approved the final version.
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Peziol, M., Elbroch, L.M., Shipley, L.A. et al. Large carnivore foraging contributes to heterogeneity in nutrient cycling. Landsc Ecol 38, 1497–1509 (2023). https://doi.org/10.1007/s10980-023-01630-0
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DOI: https://doi.org/10.1007/s10980-023-01630-0