Salamanders rank among the most abundant vertebrates in temperate forests, yet they rarely get credit for what they do there. In the forests of eastern North America, the combined mass of a single widespread species can rival or exceed that of white-tailed deer, making salamanders an outsized but mostly invisible force in how forests cycle nutrients, retain carbon, and move energy between water and land. Their ecological influence stretches from the leaf litter underfoot to headwater streams, and when their populations decline, the consequences ripple across trophic levels in ways researchers are still working to fully quantify.
More Biomass Than You Would Expect
When people think of forest wildlife, deer, songbirds, and rodents come to mind long before anything that fits under a rotting log. But biomass studies consistently show that salamanders punch far above their weight. A 2024 range-wide analysis of the eastern red-backed salamander found that this single species, a secondary consumer, carries biomass on par with or greater than familiar primary consumers like white-tailed deer and mice, and two to three orders of magnitude greater than other common secondary consumers in the same forests.1PubMed Central. Range-wide salamander densities reveal a key component of terrestrial vertebrate biomass in eastern North American forests That is not a quirk of one location. The red-backed salamander spans a vast range from the southern Appalachians into southeastern Canada, and its density at surveyed sites routinely reaches hundreds or thousands of individuals per hectare.
Why does all that biomass matter? Because it represents stored energy sitting in the middle of the food web. Salamanders eat enormous quantities of invertebrates, and they are in turn eaten by snakes, birds, shrews, and other salamanders. A database of predator-prey interactions documented 156 salamander predation events involving 69 salamander species consumed by 89 predator species, with snakes being the most frequent predators, followed by other salamanders and then birds.2Elsevier / Food Webs. Emergent patterns between salamander prey and their predators Salamanders function as a slow-release energy supply for predators across ecological succession, a role few other vertebrate groups fill at the same scale in temperate forests.3Annual Review of Ecology, Evolution, and Systematics. On the Ecological Roles of Salamanders
Carbon Storage Through the Leaf Litter
Forests store carbon in their soils as much as in their trees, and the leaf litter layer on the forest floor is a critical early stage of that process. Salamanders shape what happens in that layer through an indirect mechanism: by eating the invertebrates that would otherwise chew through dead leaves faster.
A field experiment with Ensatina salamanders in the Pacific Northwest showed that a single salamander in a small enclosure increased leaf litter retention by roughly 13% compared to controls, capturing an estimated 200 kilograms of carbon per hectare. Scaled across the species’ range, that effect would translate to over 70 metric tons of carbon per year potentially held in forest soil rather than released into the atmosphere in a single season.4Ecosphere. The trophic role of a forest salamander: impacts on invertebrates, leaf litter retention, and the humification process The number is an extrapolation, not a direct measurement of continental-scale sequestration, but the mechanism is clear and repeatable.
Research in European forests echoed these results, finding that the presence of salamanders reduced decomposition rates of oak litter by up to 20%. Salamanders achieved this by increasing predation on detritivores, which altered the composition of the invertebrate community and even shifted the microbial community on the leaf litter itself. With fewer bacteria associated with litter degradation present, the litter broke down more slowly.5PubMed. Salamander loss alters litter decomposition dynamics The takeaway is that removing salamanders does not just remove a predator; it changes the pace at which forests process their own dead material and how long carbon stays locked in the soil.
Connecting Water and Land
Many salamander species live a split life, breeding and developing as larvae in ponds or streams before emerging onto land as adults. That life cycle creates an ecological bridge between aquatic and terrestrial systems. Breeding adults carry terrestrial energy into ponds; metamorphosing juveniles carry aquatic energy back into the forest. This lateral flow of nutrients and calories between habitats is something researchers call a subsidy, and salamanders are among the most important vertebrate vehicles for it in temperate forests.
A study of pond-breeding ambystomatid salamanders in southern Illinois quantified these subsidies directly. Emerging metamorphs exported an average of about 70 grams of ash-free dry mass per pond per year to the surrounding forest, with some ponds contributing over 130 grams.6PubMed. Energy flow and subsidies associated with the complex life cycle of ambystomatid salamanders in ponds and adjacent forest in southern Illinois Separately, analysis of metamorphosing salamanders found they exported 3 to 8% of total prey production from the pond to adjacent forest, with aquatic insects, zooplankton, and amphibian prey all contributing to the energy flow.7Freshwater Biology. Variation in the trophic basis of production and energy flow associated with emergence of larval salamander assemblages from forest ponds These numbers become meaningful when you multiply them across the thousands of small ponds and headwater pools scattered through a forest landscape. Salamanders are, in effect, a living conveyor belt moving nutrients from water to land and back again.8Diversity. Reciprocal Role of Salamanders in Aquatic Energy Flow Pathways
Top Predators in Headwater Streams
In the small, fishless headwater streams that form the capillary network of most forested watersheds, salamander larvae often sit at the top of the aquatic food chain. These streams are too shallow or too intermittent for fish, which means salamanders fill the predator role that fish would otherwise occupy.
Experimental work has shown that stream-dwelling salamander larvae significantly reduce macroinvertebrate abundance. When two salamander species were present together in experimental stream enclosures, macroinvertebrate taxon richness dropped by about 57%, with midges being hit especially hard.9Freshwater Biology. Salamander diversity alters stream macroinvertebrate community structure The effect was stronger with greater salamander diversity, suggesting that different species complement each other rather than simply competing for the same prey. That finding matters because it means losing even one salamander species from a stream could shift invertebrate community structure in ways that cascade through the food web.
The picture gets more nuanced, though, when interactions among salamander species themselves come into play. In another experiment testing the spring salamander alongside a smaller brook salamander in fishless streams, the larger species reduced invertebrate densities when alone but not when both species were present together, because the spring salamander was eating the smaller species. That intraguild predation dampened the overall top-down effect on invertebrates.10Herpetologica. Top-Down Effects of Salamanders on Macroinvertebrates in Fishless Headwater Streams The upshot is that salamanders’ influence on stream ecosystems depends not just on whether they are present but on which species are present and how they interact with each other.
What Timber Harvesting Does to Salamander Populations
Salamanders need moisture, shade, cool temperatures, and a thick leaf litter layer. Logging operations that open the canopy and dry out the forest floor can wipe out local populations quickly. A long-term study tracking red-backed and northern slimy salamanders before and after different harvest treatments found clear declines in both species following group selection cuts and clearcuts. However, shelterwood harvests, which retain more canopy cover, did not produce the same declines, and neither did forested sites adjacent to the cuts.11PubMed Central. Effects of Timber Harvests and Silvicultural Edges on Terrestrial Salamanders Edge effects from recent clearcuts extended roughly 20 meters into the intact forest, with the severity varying by slope orientation. South-facing edges, which receive more sun, were harsher.
Prescribed fire adds another layer of complexity. A study examining the combined and individual effects of fire and timber harvest found that salamander abundance and surface activity dropped after treatment in shelterwood, midstory removal, and burn units alike. Populations in midstory and burn units bounced back in the second year after treatment, but salamanders in shelterwood harvest units continued to decline.12The Journal of Wildlife Management. Prescribed fire and timber harvest effects on terrestrial salamander abundance, detectability, and microhabitat use This suggests that not all forest management is equal from a salamander’s perspective, and recovery timelines can vary widely depending on the type and intensity of disturbance.
Coarse woody debris, the fallen logs and branch piles left after a harvest, can serve as refugia. A survey of slash piles created by forestry operations in New Mexico found Sacramento Mountain salamanders occupying half of the piles surveyed. Salamander density was highest inside the piles themselves, particularly those containing moisture-retaining debris and accumulated leaf litter.13Fire Ecology. Evaluating slash piles as habitat for a threatened salamander Retaining woody debris after timber operations is one of the simplest things land managers can do to maintain salamander habitat.
The Invasive Earthworm Problem
One of the less obvious threats to forest salamanders comes from below the soil surface. Invasive Asian earthworms in the genus Amynthas, sometimes called “jumping worms” or “crazy worms,” have spread through much of the eastern United States and are dramatically altering the leaf litter layer that salamanders depend on. These worms consume surface litter voraciously, converting thick organic layers into granular castings that look like coffee grounds. For a salamander that forages, mates, and disperses through the litter matrix, this transformation can be devastating.14Canadian Journal of Zoology. Invasive Asian earthworms of the genus Amynthas alter microhabitat use by terrestrial salamanders
Experimental evidence confirms the harm. When paired with invasive pheretimoid earthworms, red-backed salamanders shifted to lower-quality microhabitats roughly 34% more often, and they ate about 19% fewer prey items compared to salamanders without earthworm competition. In the field, salamanders and these invasive earthworms co-occurred under cover objects about 60% less often than expected by chance, and juvenile and male salamander abundances were negatively correlated with earthworm abundance.15PLoS ONE. Invasive Asian Earthworms Negatively Impact Keystone Terrestrial Salamanders Higher earthworm densities were also associated with thinner, lower-quality leaf litter, creating a feedback loop: more worms means worse habitat, which means fewer salamanders, which may mean less top-down control on other invertebrate communities.
Not all earthworm-salamander relationships are straightforward, though. The European nightcrawler, another non-native earthworm now widespread in North America, interacts with red-backed salamanders in multiple ways: it degrades habitat by mixing litter into deeper soil, but it also provides burrows that salamanders can use as shelter and serves as a direct prey item.16PubMed. Comparison of direct, indirect, and ecosystem engineering effects of an earthworm on the red-backed salamander The net outcome depends on earthworm density and species, but at the invasion levels currently spreading through northeastern and midwestern forests, the negative effects on salamanders appear to dominate.
Climate Change and the Energy Budget of Dormancy
Warming temperatures might seem like they would benefit cold-blooded animals, but for many forest salamanders the opposite may be true, and the reason has to do with what happens during winter. A 2025 preprint studying woodland salamanders found something surprising: even while showing physical signs of dormancy, salamanders had higher metabolic rates during winter than during the active season when measured at low temperatures. Essentially, their bodies compensate for cold by burning more energy, not less. High-elevation populations showed this effect even more strongly than low-elevation ones.
When those winter metabolic rates were fed into a species distribution model, the depletion of energy stores during dormancy accurately predicted the current geographic range limits of the focal species. Under future warming scenarios, the model predicted that 77% of the species’ range would become unviable because warmer winters would extend or intensify the metabolic costs of dormancy, draining energy reserves faster than they can be replenished.17bioRxiv. Winter metabolic compensation endangers woodland salamanders under climate change This flips the usual assumption that warmer conditions help ectotherms. For salamanders adapted to cold forests, milder winters may actually starve them from the inside out.
A Fungal Pathogen That Could Reshape Salamander Communities
The chytrid fungus Batrachochytrium dendrobatidis has devastated frog populations worldwide. A related fungus, Batrachochytrium salamandrivorans (commonly called Bsal), does the same thing to salamanders. Identified in 2013, Bsal has already caused severe die-offs in fire salamander populations in Europe. The United States, which harbors the highest salamander diversity on the planet, has so far avoided a Bsal outbreak, but the threat is considered imminent enough that the U.S. Geological Survey has called for development of a national response strategy to protect global salamander biodiversity from the fungus’s likely invasion.18U.S. Geological Survey. Salamander chytrid fungus (Batrachochytrium salamandrivorans) in the United States—Developing research, monitoring, and management strategies
Research in Vietnam has provided evidence that Bsal may be endemic to Asia, where salamander species appear to carry the fungus without suffering mass mortality, acting as a disease reservoir. The fungus was found to be more widespread in northern Vietnam than previously appreciated and tolerated temperatures higher than those the type strain was thought to survive in, suggesting a broader thermal niche than originally assumed.19Scientific Reports. Batrachochytrium salamandrivorans is the predominant chytrid fungus in Vietnamese salamanders That wider thermal range makes the fungus a greater risk for temperate forests, and it underscores the urgency of biosecurity measures on amphibian trade. The pet trade is considered the most likely pathway for Bsal to reach North America.
Why Riparian Buffers Need to Be Wide Enough
Riparian buffer strips, the bands of uncut forest left alongside streams during timber harvests, are one of the most common management tools for protecting aquatic salamanders. But the evidence suggests that many current regulations set buffers too narrow to actually work. A study of larval salamander abundances in Appalachian headwater streams found that retaining a 9-meter buffer was no better than removing all riparian forest entirely. Larval salamanders were negatively affected by increased sedimentation and decreasing buffer width. Only when the buffer reached 30 meters or more did researchers find no significant difference between buffered and uncut control sites.20Forest Ecology and Management. Efficacy of riparian buffers in mitigating local populations declines and the effects of even-aged timber harvest on larval salamanders
Research from the Oregon Coast Range reached a parallel conclusion: riparian buffer strips were useful as a habitat management strategy for several salamander species, but the buffer widths required by state forest practices regulations at the time were likely insufficient to prevent local declines in amphibian community diversity.21Forest Science. Salamander Abundance and Amphibian Species Richness in Riparian Buffer Strips in the Oregon Coast Range Across both eastern and western forests, the pattern is the same: the buffers mandated by law tend to be narrower than the buffers salamanders actually need.
Salamanders as Pollution Sentinels
Because salamanders breathe partly through their skin, are tied to moist microhabitats, and sit in the middle of forest food webs, they accumulate contaminants in ways that make them useful indicators of environmental health. Mercury is one of the most studied examples. A study of headwater stream food webs found significant bioaccumulation of total mercury across all measured components, including insects, spiders, salamanders, and birds, with trophic position being the strongest predictor of mercury concentration.22PubMed. Mercury bioaccumulation in temperate forest food webs associated with headwater streams Salamanders sit high enough in the food chain to concentrate mercury but are abundant and easy enough to sample that they can serve as a practical monitoring tool for contamination across a landscape.
This bioaccumulation also means that when salamanders are eaten by birds, snakes, or mammals, they pass concentrated pollutants up to their predators. The same trait that makes salamanders valuable as ecosystem sentinels makes them a potential conduit for contaminant magnification through the food web. Monitoring salamander mercury levels in headwater areas can flag pollution problems before they show up in larger, more charismatic wildlife.
The Appalachian Diversity Hotspot
Nowhere on Earth contains more salamander diversity per unit area than the southern Appalachian Mountains. This region is the global center of diversity for lungless salamanders, the family Plethodontidae, which comprises the majority of salamander species worldwide. The reasons are partly geological: these mountains were never glaciated, giving populations millions of years to diverge in isolated valleys and on separate peaks. Phylogeographic analysis of the pygmy salamander, an endemic restricted to the highest Appalachian peaks, revealed four genetically distinct population clusters that probably remained fragmented even during the cooler climates of the Pleistocene, when other species expanded their ranges. Barriers to dispersal, including competition with other plethodontid salamanders, kept populations isolated and allowed significant genetic divergence.23PubMed. Testing Pleistocene refugia theory: phylogeographical analysis of Desmognathus wrighti, a high-elevation salamander in the southern Appalachians
This concentration of unique lineages on isolated mountaintops makes Appalachian salamander communities especially vulnerable to the threats described throughout this article. Climate change pushing metabolically costly conditions upslope, invasive earthworms degrading litter, Bsal potentially arriving through the pet trade, and inadequate riparian protections during timber operations all converge in a region where local extinctions cannot be buffered by immigration from nearby populations. Losing a genetically distinct population from a single mountain peak may mean losing millions of years of evolutionary history that cannot be replaced.
When People Do Not Like Salamanders
Conservation success depends partly on whether people care about the animal in question, and salamanders face a perception problem. They are small, nocturnal, secretive, and often confused with lizards. A study of human attitudes toward amphibians and reptiles in Portugal found that the presence of folklore and negative cultural values significantly predicted persecution and anti-conservation attitudes toward these animals.24PubMed Central. Human attitudes towards herpetofauna: the influence of folklore and negative values on the conservation of amphibians and reptiles in Portugal While that study focused on a European context, the pattern is broadly relevant. Salamanders rarely inspire the public enthusiasm that mammals and birds do, which makes it harder to fund research, justify habitat protections, or build political will for management changes like wider riparian buffers.
Reframing salamanders as ecosystem engineers rather than obscure woodland curiosities may help. The evidence that they regulate carbon cycling, structure invertebrate communities, transfer energy between habitats, and serve as pollution indicators builds a practical case for their protection that does not depend on charisma. Forest managers who already protect streams for fish habitat or maintain coarse woody debris for small mammals are, often without knowing it, also maintaining conditions that salamanders need. Making that connection explicit in management guidelines and public outreach may be one of the most cost-effective conservation strategies available for this group.