Abstract
Predator avoidance behaviour has been observed in many species and can strongly affect trophic interactions. Animals frequently adjust their response to predators in proportion to risk; however, when they are exposed to chronic predation risk, some animals reduce their antipredator responses in favour of resource acquisition. Animals that are subjected to predation pressure from multiple predator species may have to respond to different spatial and temporal distributions of risk; how they balance these risks will affect their choice of habitat or microhabitat patches. One species that is exposed to a wide range of predators is the pygmy salamander, Desmognathus wrighti. These miniaturized terrestrial plethodontids spend their entire life on the forest floor where they are exposed to a diversity of predators. We examined pygmy salamanders' ability to avoid potential predators based on the presence of substrate-borne chemical cues. The predator species included ground beetles (Carabidae: Pterostichus), Jordan's salamanders, Plethodon jordani, and ring-necked snakes, Diadophis punctatus. The ring-necked snake is a trophic specialist feeding on salamanders while the beetles and Jordan's salamanders are generalist predators. The pygmy salamanders were also exposed to chemical alarm cues from a congeneric salamander (Desmognathus fuscus) and odours from two unfamiliar species: corn snakes (Pantherophis gutattus) and herbivorous desert tortoises (Gopherus agassizii). We used a hierarchical Bayesian beta regression with a repeated measures design to model proportion of time spent in each treatment. Compared to controls, pygmy salamanders exhibited strong aversion to fed ring-necked snakes, a moderate avoidance of unfamiliar odours and a slight attraction to scents from the two common generalist predators. Our results suggest that pygmy salamanders accept modest risk from common generalist predators but avoid less common, specialist predators and unfamiliar species.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 169-181 |
| Number of pages | 13 |
| Journal | Animal Behaviour |
| Volume | 148 |
| DOIs | |
| State | Published - Feb 2019 |
Bibliographical note
Funding Information:We gratefully acknowledge the helpful comments from Dr M. Leal and three anonymous referees. Correspondence with Drs Richard Bruce, Stephen Tilley, Kiisa Nishikawa and James Petranka provided valuable insights to our understanding of the predator/prey relationship between D. wrighti and P. jordani. Thanks to Paul Super, Science Coordinator of the Appalachian Highlands Learning Center at Purchase Knob, Great Smoky Mountains National Park for providing permission to collect in the National Park and A. Pierce for her assistance with collection of the D. wrighti (Permit no. GRSM-2001-SCI-0072). Dr John Maerz kindly identified the ground beetles used in our behavioural trials. Tom Coard and Jeff Klupt built the experimental chambers and Jeff Klupt wrote the data collection program. Darlene Godman maintained our fruit fly cultures and numerous TU undergraduates assisted in collecting salamanders and snakes used in the behavioural trials. Dr Joel Snodgrass assisted during the early phase of experimental design. This project was funded, in part, through a grant from the Towson University Fisher College of Science and Mathematics and by National Science Foundation (NSF) REU grant DBI-9732442 . J.D.F. received training support from NSF DEB 1145200 .
Funding Information:
We gratefully acknowledge the helpful comments from Dr M. Leal and three anonymous referees. Correspondence with Drs Richard Bruce, Stephen Tilley, Kiisa Nishikawa and James Petranka provided valuable insights to our understanding of the predator/prey relationship between D. wrighti and P. jordani. Thanks to Paul Super, Science Coordinator of the Appalachian Highlands Learning Center at Purchase Knob, Great Smoky Mountains National Park for providing permission to collect in the National Park and A. Pierce for her assistance with collection of the D. wrighti (Permit no. GRSM-2001-SCI-0072). Dr John Maerz kindly identified the ground beetles used in our behavioural trials. Tom Coard and Jeff Klupt built the experimental chambers and Jeff Klupt wrote the data collection program. Darlene Godman maintained our fruit fly cultures and numerous TU undergraduates assisted in collecting salamanders and snakes used in the behavioural trials. Dr Joel Snodgrass assisted during the early phase of experimental design. This project was funded, in part, through a grant from the Towson University Fisher College of Science and Mathematics and by National Science Foundation (NSF) REU grant DBI-9732442. J.D.F. received training support from NSF DEB 1145200.
Publisher Copyright:
© 2018 The Association for the Study of Animal Behaviour
Keywords
- Bayesian beta regression
- Desmognathus
- predator avoidance
- risk allocation hypothesis
- threat sensitivity hypothesis
