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2018 SOUTHEASTERN NATURALIST 17(1):166–175
Chemical Detection of Intraguild Predators (Gyrinophilus,
Pseudotriton) by Streamside Plethodontid Salamanders
(Eurycea)
Glenn A. Marvin1,* and Paul V. Cupp Jr.2
Abstract - To examine whether chemical cues from intraguild predators may affect
microhabitat selection by plethodontid salamanders of the genus Eurycea, we tested
metamorphosed individuals for the ability to discriminate among odors from 3 larger
salamander species. Metamorphosed individuals of Eurycea and 2 of the larger species
(Gyrinophilus porphyriticus [Spring Salamander] and Pseudotriton ruber [Red Salamander])
are semiaquatic and often inhabit streamside environments, whereas individuals of the
third of the larger species, Plethodon glutinosus (Northern Slimy Salamander), are strictly
terrestrial and primarily inhabit woodlands. In the lab, we placed each Eurycea individual
in a petri dish with 2 substrate choices. One substrate had chemical cues (i.e., skin secretions
and wastes deposited for 6 d) from an adult individual of 1 of the 3 large salamander
species, whereas the other substrate had chemical cues from an adult individual of a small
Plethodon species (P. dorsalis [Northern Zigzag Salamander] or P. ventralis [Southern Zigzag
Salamander]). We recorded the location of each individual on either substrate at 3-min
intervals for 2 h. For individuals of both Eurycea cirrigera (Southern Two-lined Salamander)
and E. longicauda (Long-tailed Salamander), we tested different experimental groups
with the odor of 1 large salamander species. Our results indicate that Southern Two-lined
Salamander individuals in Kentucky avoid chemical cues from Spring Salamander and Red
Salamander, but not Northern Slimy Salamander. Individuals of both Southern Two-lined
Salamander and Long-tailed Salamander in Alabama avoid chemical cues from Red Salamander,
but not Northern Slimy Salamander. Spring Salamander and Red Salamander often
prey on salamanders, whereas Plethodon rarely do; thus, we conclude that individuals of
different Eurycea species and populations distinguish the odors of salamander species that
are potential predators.
Introduction
Animals use a variety of strategies to avoid predation. Prey may use predatoravoidance
mechanisms to avoid the foraging microhabitats of predators and/or
antipredator mechanisms that reduce the probability of predation when they are
within the perceptual field of predators (Brodie et al. 1991). For many prey, the recognition
of chemical cues such as predator odors (i.e., kairomones) and alarm chemicals
released from injured prey may allow them to avoid predation (Ferrari et al. 2010).
Detection of such chemicals may be especially important for prey species that live in
habitats with low visibility (e.g., Hickman et al. 2004). For instance, many amphibian
1Department of Biology, University of North Alabama, Box 5048, 1 Harrison Plaza, Florence,
AL 35632. 2Department of Biology, Eastern Kentucky University, Richmond, KY
40475. *Corresponding author - gamarvin@una.edu.
Manuscript Editor: John Placyk
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species avoid chemicals that indicate the presence of a predator. In aquatic habitats,
larval and adult salamanders of several species detect and avoid chemical cues from
predatory fish (e.g., Epp and Gabor 2008, Petranka et al. 1987). In terrestrial habitats,
some salamander species avoid areas with chemical cues from predatory snakes (e.g.,
Cupp 1994) and places where they detect alarm chemicals (e.g., Marvin and Hutchison
1995). However, avoidance responses to chemicals are not ubiquitous and may
differ among prey populations and species (Marvin et al. 2004), perhaps due to variation
in environmental factors such as the severity of predation pressure or the types
of predators that are encountered. The detection and avoidance of chemicals from
intraguild predators can affect the selection of microhabitats by both invertebrate and
vertebrate animal species (e.g., Choh et al. 2010, Huang and Pike 2012). However,
few studies have examined the effect of odors from intraguild predators on microhabitat
preference in amphibians (e.g., Roudebush and Taylor 1987).
Intraguild predation is common among animals and may often play an important
role in population dynamics and community structure (e.g., Hairston 1987, Polis
et al. 1989). For plethodontid salamanders, the avoidance of odors from intraguild
predators may help to explain the structure of some streamside communities
(Hairston 1986, Roudebush and Taylor 1987). Although some effects of intraguild
predation on larvae of the streamside plethodontid salamander genera Eurycea,
Gyrinophilus, and Pseudotriton have been examined (Beachy 1994, Gustafson
1993), the importance of intraguild predation among metamorphosed individuals
is unexplored. In this study, we examined avoidance behavior of metamorphosed
individuals of Eurycea to odors from larger salamander species that are either potential
predators or unlikely predators. We tested the responses of individuals from
2 species and different populations to substrates with chemical cues from adults of
the plethodontid species Gyrinophilus porphyriticus Green (Spring Salamander)
and Pseudotriton ruber (Latrelle) (Red Salamander), which often eat smaller salamanders,
and Plethodon glutinosus (Green) (Northern Slimy Salamander), which
primarily eat invertebrate prey.
Both larval and metamorphosed individuals of Spring Salamander and Red Salamander
are known predators of smaller salamanders including Eurycea species;
salamanders can be a major component of their diets (Beachy 1994, Bishop 1941,
Bruce 1972, Dunn 1926, Gustafson 1993). Although adults of large Plethodon species
may occasionally eat very small salamanders (Oliver 1967, Powders 1973,
Powders and Tietjen 1974), their diets primarily consist of invertebrate animals
(Davidson 1956, Hamilton 1932, Oliver 1967, Pope 1950). Whereas metamorphosed
individuals of the Eurycea species, as well as Spring Salamanders and
Red Salamanders, are semiaquatic and often occupy streamside habitats, Northern
Slimy Salamanders are strictly terrestrial and primarily occur in woodlands (Petranka
1998). However, individuals of each streamside species may also be found
in wooded areas away from streams on moist or rainy evenings, thus providing
opportunities for predation by terrestrial salamanders. We tested the hypothesis
that metamorphosed individuals of Eurycea cirrigera (Green) (Southern Two-lined
Salamander) and E. longicauda (Green) (Long-tailed Salamander) avoid substrates
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with chemical cues from probable intraguild predators (i.e., adults of Spring Salamander
or Red Salamander), but do not avoid substrates with chemical cues from
likely non-predatory salamanders of the genus Plethodon.
Methods
Animal collection and care
We collected salamanders in Kentucky during March and April, 1988 and 1989.
We collected adult individuals of Southern Two-lined Salamander and Spring
Salamander in Rockcastle and Adair counties, Red Salamander in Rockcastle and
McCreary counties, Northern Slimy Salamander in Rockcastle and Jackson counties,
and P. dorsalis Cope (Northern Zigzag Salamander) in Madison County. Due
to resource constraints, we did not collect and test individuals of other Eurycea
species in Kentucky. In Alabama during 2009 and 2010, we collected individuals of
Southern Two-lined Salamander, Long-tailed Salamander, Red Salamander, Northern
Slimy Salamander, and Southern Zigzag Salamander in Lauderdale County.
Based on the body sizes of Long-tailed Salamander individuals (30–48 mm standard
body length), most individuals (n = 28) were likely juveniles, but some (n = 8)
were probably small adults (Anderson and Martino 1966). We used the same ratio
of juveniles to small adults (i.e., 14 to 4) in different experimental groups. We did
not include larger individuals of Long-tailed Salamanders because we presumed
that smaller individuals might be eaten more readily by, and thus, might experience
greater predation risk from, predatory salamanders. Individuals of other species
from Alabama were adults. We did not collect individuals of Spring Salamander
in Alabama because they were rare at the collection locality. Richard Highton
(University of Maryland, College Park, MD, pers. comm.) verified the presence in
Lauderdale County of Northern Slimy Salamander and Southern Zigzag Salamander
(i.e., confirmed that they were not P. mississippi (Highton) [Mississippi Slimy
Salamander] or Northern Zigzag Salamander, species which are very difficult to
distinguish visually from Northern Slimy and Southern Zigzag, respectively). We
did not determine the sex of salamanders. We kept individual salamanders in separate
housing containers (~14 cm × 14 cm × 3.5 cm) within environmental chambers
at 10–15 °C with a 12-h light:12-h dark photoperiod. We provided all salamanders
with clean paper towel substrates once a week. For at least 3 weeks prior to experiments,
we fed individuals of Northern Zigzag Salamander and Southern Zigzag
Salamander vestigial-wing Drosophila to satiation once each week, and we fed
individuals of large salamander species small Eisenia fetida Savigny (English
Redworms) to satiation once each week. We minimized the potential effect of variation
in predator diet (i.e., with salamanders as prey) on kairomone avoidance by
providing a predator diet of invertebrate animals (e.g., Madison et al. 1999). For 6
d before experiments, we kept all salamanders individually in plastic petri dishes
(14.5 cm diameter × 2.5 cm) with moist filter paper lining the bottoms. We added
~2.5 ml of distilled water to each dish to moisten the filter paper. We subsequently
used halves of these filter papers soiled with skin secretions and wastes from an
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individual of Spring Salamander, Red Salamander, Northern Slimy Salamander,
Northern Zigzag Salamander, or Southern Zigzag Salamander as substrate choices
in experiments.
Substrate choice experiments
The methods we employed for our substrate-choice experiments were very similar
to those of Cupp (1994). We conducted our experiments from April to June at
room temperature (~19–21 °C) under overhead red light (40 W) between the 2nd and
5th h of the scotophase. For an experimental trial, we transferred each Eurycea individual
to a clean glass petri dish (14.5 cm diameter × 2.5 cm) with a bottom that was
lined with 2 soiled filter paper halves. One substrate had the odor of an individual
of a large salamander species (Spring Salamander, Red Salamander, or Northern
Slimy Salamander), whereas the other substrate had the odor of an individual of a
small Plethodon species (Northern Zigzag Salamander or Southern Zigzag Salamander).
We provided substrate permeated with the odor of a small Plethodon as
the alternative choice in each trial to ensure that individuals of Eurycea would
not simply select a clean, “odorless” substrate over a soiled substrate infused with
salamander odor. We tested each individual of Eurycea with only 1 of the 3 large
species’ substrate odor (as summarized below). We tested individuals only with
odors of salamanders from the same state. Opaque partitions separated neighboring
test chambers. We released each individual at the center of a petri dish, placed lids
on dishes, and then waited 10–15 min before recording data. From behind a blind,
we observed and recorded each individual’s position on a substrate (hereafter, referred
to as the individual’s substrate choice or response) at 3-min intervals during
a 2-h trial. Thus, we recorded 40 responses for each individual in an experimental
trial. If a salamander’s body straddled the 2 substrates, we recorded the response
for the substrate on which the animal's snout rested.
We tested individuals of Southern Two-lined Salamander in Kentucky in different
experimental groups (A, B, and C) with substrate odor of Northern Zigzag
Salamander versus substrate odor of Spring Salamander (group A, n = 19), Red
Salamander (group B, n = 20), or Northern Slimy Salamander (group C, n = 20).
We tested individuals of Southern Two-lined Salamander in Alabama with substrate
odor of Southern Zigzag Salamander versus substrate odor of Red Salamander
(group D, n = 20) or Northern Slimy Salamander (group E, n = 20). We tested individuals
of Long-tailed Salamander in Alabama with substrate odor of Southern
Zigzag Salamander versus substrate odor of Red Salamander (group F, n = 18) or
Northern Slimy Salamander (group G, n = 18). To compare a pair of substrate-odor
choices (a small Plethodon species versus a large salamander species), we conducted
2 trials for each individual of Eurycea in the experimental group with 1 week
between trials. We hereafter refer to the 2 trials for an individual as the 1st and 2nd
trials. In the 1st trial, we placed the substrate with the odor of the large salamander
species on the right side of the petri dish and the small species’ odor on left. In the
2nd trial, we placed the substrate with odor of the large salamander species on the
left side and with the small species’ odor on right. For each individual of Eurycea in
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an experimental group, we calculated an avoidance index as the difference between
the number of responses to the substrate with odor of the small species in the 1st trial
and the number of responses to the substrate with odor of the large species in the 2nd
trial. For the avoidance index (which could range from -40 to 40), a value close to
zero indicated no odor avoidance while a high positive value indicated avoidance
of the large salamander species’ odor.
Statistical analyses
We square-root transformed data when necessary to meet assumptions of parametric
tests. When assumptions were not met following data transformation, we
conducted non-parametric tests. For individuals of Southern Two-lined Salamander
in Kentucky, we performed analysis of variance (ANOVA) to compare avoidance
indices to the odors of Spring Salamander, Red Salamander, and Northern Slimy
Salamander. For individuals of either Southern Two-lined Salamander or Longtailed
Salamander in Alabama, we used a t-test to compare avoidance indices
(square-root–transformed) to the odors of Red Salamander and Northern Slimy
Salamander. We employed a Wilcoxon matched-pairs signed-ranks test to assess
position bias in each experimental group. For each individual in an experimental
group, we compared the number of responses to the substrate with odor from the
small salamander species in the 1st trial to the number of responses to the substrate
with odor from the small salamander species in the 2nd trial.
Results
For individuals of Southern Two-lined Salamander in Kentucky, avoidance indices
were significantly different in response to the odors of Spring Salamander, Red
Salamander, and Northern Slimy Salamander (F2,56 = 6.38, P < 0.01; Fig. 1). Avoidance
indices were significantly greater to the odor of either Spring Salamander or
Red Salamander than to the odor of Northern Slimy Salamander (t = 3.45 and 2.52,
P < 0.01 and P = 0.029, respectively), but there was no significant difference between
avoidance indices to the odors of Spring Salamander and Red Salamander (t = 0.95,
P = 0.34; Fig. 1). For individuals of Southern Two-lined Salamander in Alabama,
avoidance indices to the odor of Red Salamander were significantly greater than to
the odor of Northern Slimy Salamander (t38 = 3.18, P < 0.01; Fig. 1). For individuals
of Long-tailed Salamander in Alabama, avoidance indices to the odor of Red Salamander
were significantly greater than to the odor of Northern Slimy Salamander
(t34 = 5.10, P < 0.001; Fig. 1). Individuals of Eurycea showed no statistically significant
position bias in any of the experiments (Table 1).
Discussion
Given the great diversity of plethodontid salamander species that inhabit
the woodlands and streams of the southeastern US, an increased knowledge of
the variety of interactions among these species can improve our understanding
of these ecosystems. For example, intraguild predation has been implicated as
an important factor determining microhabitat use and population size in some
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Figure 1. Avoidance indices for
individuals of Eurycea cirrigera
(Southern Two-lined Salamander)
and E. longicauda (Long-tailed
Salamander) during 2-choice lab
experiments when presented with
substrates with the odor of a small
salamander species (Plethodon
dorsalis Cope [Northern Zigzag
Salamander] in Kentucky or
P. ventralis [Southern Zigzag Salamander]
in Alabama) or a large,
potentially predatory salamander
species (Gyrinophilus porphyriticus
[Spring Salamander], Pseudotriton
ruber [Red Salamander],
or P. glutinosus [Northern Slimy
Salamander]). Box plots show
min, max, median, mean (dotted
line), and percentiles (10th, 25th,
75th, and 90th). Spring = G. porphyriticus,
Red = P. ruber, Slimy
= P. glutinosus. An asterisk (*) =
P < 0.03 (t-test for each Eurycea
species in Alabama, or ANOVA with Holm-Sidak multiple comparison method for Southern
Two-lined Salamander in Kentucky).
Table 1. Results of statistical tests for position bias by individuals of Eurycea cirrigera (Southern
Two-lined Salamander) and E. longicauda (Long-tailed Salamander) during 2-choice lab experiments
when presented with substrates with the odor of a small salamander species (Plethodon dorsalis
Cope [Northern Zigzag Salamander] in Kentucky or P. ventralis [Southern Zigzag Salamander] in
Alabama) or a large, potentially predatory salamander species (Gyrinophilus porphyriticus [Spring
Salamander], Pseudotriton ruber [Red Salamander], or P. glutinosus [Northern Slimy Salamander]).
To test for position bias in each experimental group, we compared left-side versus right-side choices
for substrate with odor of the small species between 2 experimental trials. Statistical values are from
Wilcoxon matched-pairs signed-ranks tests.
Position bias test
Eurycea species (state) Potential predator n W T+ Z P
Southern Two-lined Salamander (KY)
Spring Salamander 19 12.0 91.5 0.3 0.799
Red Salamander 20 64.0 117.5 1.4 0.167
Northern Slimy Salamander 20 -6.0 102.0 -0.1 0.927
Southern Two-lined Salamander (AL)
Red Salamander 20 -60.0 38.0 -1.6 0.130
Northern Slimy Salamander 20 -21.0 66.0 -0.5 0.644
Long-tailed Salamander (AL)
Red Salamander 18 37.0 78.5 1.1 0.303
Northern Slimy Salamander 18 -2.0 51.5 -0.1 0.952
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streamside salamander communities (Hairston 1987). Although the impacts of
intraguild predation by larval individuals of Gyrinophilus and Pseudotriton on
growth and survivorship of larval salamanders of the genus Eurycea have been
examined (Beachy 1994, Gustafson 1993), the potential ef fect of intraguild predation
on microhabitat selection by metamorphosed individuals is unknown for these
plethodontid salamanders. Our results indicate that metamorphosed individuals of
Southern Two-lined Salamander in Kentucky avoid substrates with chemical cues
from the predatory salamander species Spring Salamander and Red Salamander.
Likewise, metamorphosed individuals of Southern Two-lined Salamander and
Long-tailed Salamander in Alabama apparently avoid substrates with chemical
cues from Red Salamander. These results indicate that metamorphosed individuals
of different Eurycea species and populations detect and avoid odors from predatory
salamanders. We infer that this ability has selective value by reducing predation
risk via enhanced predator avoidance in the field. However, because species interactions
in a guild involve both competition and predation, additional research is
needed to determine to what degree the behavioral response to the odor of another
species is a reflection of predation and/or competition.
Similarly, the recognition and avoidance of chemical cues from different
predators has been implicated as a beneficial behavior that reduces predation risk
for individuals of many other salamander species. Individuals of D. monticola
Dunn (Seal Salamander) avoid chemical cues from predatory D. quadramaculatus
(Black-bellied Salamander) (Roudebush and Taylor 1987). Individuals of
Northern Zigzag Salamander, P. richmondi Netting and Mittleman (Southern
Ravine Salamander), and D. ochrophaeus Cope (Allegheny Mountain Dusky
Salamander) avoid substrates with chemical cues from predatory snakes (Cupp
1994). Individuals of E. nana Bishop (San Marcos Salamander) and E. multiplicata
(Many-ribbed Salamander) avoid chemical cues from predatory fish (Epp
and Gabor 2008, Hickman et al. 2004). Larval individuals of Ambystoma annulatum
Cope (Ringed Salamander) may reduce predation risk by decreasing activity
in response to the detection of chemical cues from predatory newts (Mathis et al.
2003). Salamanders may also respond to chemical cues by altering foraging and
mating behavior to reduce exposure to predators (Fonner and Woodley 2015, Sullivan
et al. 2002).
For prey in some environments, it may also be beneficial to distinguish among
chemical cues from various species and only avoid odors from probable predators
(e.g., Crane et al. 2012, Epp and Gabor 2008). Our results indicate that metamorphosed
individuals of Southern Two-lined Salamander and Long-tailed Salamander
do not avoid substrates with chemical cues from adult individuals of Northern
Slimy Salamander, which are large enough to be a potential predator of small
salamanders but do not typically prey on individuals of Eurycea species (e.g.,
Hamilton 1932). Individuals of Eurycea did not avoid substrate with the odor of
large, adult Northern Slimy Salamander; thus, their avoidance of substrate with the
odor of either Spring Salamander or Red Salamander was probably not simply due
to an avoidance of a larger amount of chemicals produced by a larger salamander.
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2018 Vol. 17, No. 1
Our results indicate that metamorphosed individuals of Eurycea species have the
ability to discriminate among chemical cues from larger salamander species that
are predatory versus those that are non-predatory. This behavior would likely be
advantageous for individuals in the field because they would not expend time and
energy avoiding sites with odors from large salamanders that are not a likely predatory
threat. Similarly, individuals of the terrestrial salamander P. angusticlavius
Grobman (Ozark Zigzag Salamander) distinguish between chemical cues from
predatory versus non-predatory mammals (Crane et al. 2012).
The avoidance of kairomones from intraguild predators can be an important
factor that affects microhabitat preference in some prey species (e.g., Choh et al.
2010, Huang and Pike 2012). Likewise, microhabitat selection by metamorphosed
individuals of Eurycea may be influenced by kairomones from Spring Salamander
and Red Salamander. In many salamander species, individuals deposit odors or
pheromones that aid in the location and identification of potential mates and/or the
marking of territories (Jaeger and Forrester 1993). For predator–prey interactions
among salamander species, perhaps such chemicals can also be recognized by prey
to detect the foraging microhabitats of predators. Although the ability to detect
predator odors does not necessarily protect an individual from foraging predators,
some reduction in predation risk may be gained by selecting microhabitats not frequented
by predators. This behavior could be an important factor that influences the
selection of a home-range area, territory, refuge, or oviposition site by an individual.
For example, females of A. barbouri Kraus and Petranka (Streamside Salamander)
apparently benefit from selective oviposition in pools that lack predatory fish (Kats
and Sih 1992). Additional research that examines the responses of Eurycea species
to predatory salamander odors is needed to investigate whether (1) responses are
innate or learned (e.g., whether responses may vary between juveniles and adults),
(2) differences in predator diet (e.g., with salamanders as prey versus invertebrate
animals as prey) affect responses, (3) ecological factors (e.g., differences in densities
of predator or prey species) affect responses, (4) season and time of day affect
responses, and (5) detection of odors affects antipredator behaviors, stress levels,
activity levels and patterns, and behaviors such as foraging and mating.
Acknowledgments
Scientific collecting permits were issued by the Kentucky Department of Fish and Wildlife
Resources to P.V. Cupp and G.A. Marvin and the Alabama Department of Conservation
and Natural Resources to G.A. Marvin. This study was approved by the Institutional Animal
Care and Use Committee at Eastern Kentucky University for P.V. Cupp and G.A. Marvin
and the University of North Alabama for G.A. Marvin. The research was funded by the Biology
Departments at Eastern Kentucky University and University o f Northern Alabama.
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