Wolf Predator: The Role of Wolves in Ecosystems

Wolves (Canis lupus) function as apex predators whose ecological influence extends beyond direct predation on prey. This article examines the documented roles of wolves in ecosystems, focusing on predator-prey dynamics, trophic cascades, and the evidence from long-term studies in Yellowstone National Park and other regions. The content is intended for students, researchers, life-science professionals, and informed general readers who seek a rigorous understanding of wolf ecology based on peer-reviewed research.

At a Glance

The Apex Predator Role

Wolves occupy the upper trophic level in many northern hemisphere ecosystems. As apex predators, they exert direct effects on prey populations through predation and indirect effects through behavioral changes in prey species. The ecological significance of wolves stems from their position at the top of food webs, where their presence or absence can influence multiple trophic levels.

The concept of the trophic cascade has been central to ecology since the 1980s, with more than 2000 scientific articles addressing the topic. A trophic cascade occurs when predators indirectly affect the abundance or behavior of organisms at lower trophic levels through their effects on intermediate species. The definition and application of this concept remain subjects of active scientific discussion, with researchers emphasizing the need for consistent language to facilitate scientific progress and utility in management and conservation (What is a Trophic Cascade?, Trends in Ecology & Evolution, 2016).

Wolves primarily prey on large ungulates including elk, deer, moose, and caribou. The predator-prey relationship is not uniform across landscapes or time. Wolf predation pressure varies with prey density, alternative prey availability, wolf pack size, and environmental conditions. Understanding these dynamics requires long-term monitoring of both predator and prey populations.

Wolf Pack Structure and Hunting Behavior

Wolf packs are family groups typically consisting of a breeding pair and their offspring from multiple years. Pack size varies with prey availability and habitat productivity. Larger packs are generally associated with larger prey species and higher prey densities.

Hunting success depends on multiple factors including pack coordination, prey condition, terrain, and snow depth. Wolves typically target vulnerable individuals within prey populations, including juveniles, old animals, and those in poor physical condition. This selective predation can influence prey population structure over time.

The social structure of wolf packs affects their ecological impact. Breeding pairs coordinate hunting activities, and pack members share kills. The dispersal of young wolves from natal packs establishes new territories and expands wolf range into adjacent areas. This dispersal behavior has implications for the spatial distribution of wolf effects across landscapes.

Direct Effects on Prey Populations

The most direct ecological role of wolves is predation on ungulate prey. Long-term studies have documented substantial effects of wolf colonization on elk populations in the Greater Yellowstone Ecosystem. A before-after-control-impact analysis examined 33 years of data from 12 elk population segments across southwestern Montana and northwestern Wyoming. Elk recruitment, measured by midwinter juvenile to female ratios, declined by 35% in herds colonized by wolves, with annual population growth shifting from increasing to decreasing (Ecosystem Scale Declines in Elk Recruitment and Population Growth with Wolf Colonization, PLoS ONE, 2014).

The same study found that liberal estimates of wolf predation rates on juvenile elk could explain no more than 52% of the total decline in juvenile to female ratios in wolf-colonized herds, after accounting for other limiting factors. This finding indicates that wolf predation interacts with other ecological factors instead of acting in isolation. Population density and winter severity, long recognized as important for elk dynamics, were detected in uncolonized herds but not in wolf-colonized herds after wolf colonization.

Wolf predation on juvenile ungulates can be substantial. A study of 180 juvenile moose in western Canada found that wolf predation accounted for 55.1% of mortalities, followed by bears at 14.5%, humans at 14.5%, health-related causes at 10.1%, and cougars at 5.8%. Juvenile survivorship from capture at 7 to 8 months old to recruitment at 18 months old was 0.59. The use of forest harvest features, including new cutblocks and higher road densities, reduced juvenile survival, presumably from increased predator and hunter efficiency in these habitats (Forest harvest and natural stressors compound to reduce juvenile ungulate survival, 2026).

Wolf predation can also target specific prey species under certain conditions. In northwestern Portugal, researchers documented wolf dietary specialization on free-ranging horses. Horses comprised 85% and 93% of wolf consumed biomass in 2017 and 2018 respectively, suggesting strong positive selection. Genetic analyses identified 39 horses from wolf feeding sites and scat remains, with predation affecting foals at 12%, juveniles at 38%, and adults at 50% of confirmed predation events (Unveiling wolf dietary specialization on free ranging horses using forensic genetics and field monitoring, Scientific Reports, 2026).

Trophic Cascades

Defining Trophic Cascades

A trophic cascade occurs when predators at the top of a food web indirectly benefit organisms at lower trophic levels by suppressing their direct consumers. The concept has been influential in ecology, but basic questions remain about what constitutes a trophic cascade. Researchers have offered definitions designed to be widely applicable yet explicit enough to exclude extraneous interactions, providing a common language for scientists, policy makers, and conservationists (What is a Trophic Cascade?, Trends in Ecology & Evolution, 2016).

Trophic cascades can operate through two pathways. Density-mediated cascades occur when predators reduce prey abundance, releasing plants from herbivory. Behaviorally-mediated cascades occur when the threat of predation changes prey behavior, such as foraging patterns, without necessarily reducing prey density.

The Yellowstone Wolf-Elk-Willow Model

Yellowstone National Park provides the most studied example of wolf reintroduction and its ecological effects. Wolves were reintroduced in 1995 after a 70-year absence. The subsequent changes in elk populations and vegetation have been extensively documented, though the interpretation of these changes has evolved with improved sampling methods.

The first 15 years after wolf reintroduction saw substantial changes in elk populations and vegetation dynamics. The Yellowstone case has been described as a textbook example of a trophic cascade involving changes in elk behavior and density that promote plant regeneration (Trophic cascades in Yellowstone: The first 15 years after wolf reintroduction, Biological Conservation, 2012).

However, recent research has challenged the strength of the Yellowstone trophic cascade. A 2022 study demonstrated that a tradition of non-random sampling confounded understanding of this system. Long-term data indicated that sampling only the tallest young plants overestimated regeneration of overstory aspen by a factor of 4 to 7 compared to random sampling. This occurred because non-random sampling favored plants taller than the preferred browsing height of elk and overlooked non-regenerating aspen stands. Random sampling described a trophic cascade, but it was weaker than the one that non-random sampling described (Sampling bias exaggerates a textbook example of a trophic cascade, Ecology Letters, 2022).

The authors of the original research responded that although sampling the five tallest young aspen in a stand is useful for detecting the occurrence of any aspen recruitment, this technique overestimates the population response of aspen to wolf reintroduction. Their original conclusion that random sampling described a trophic cascade that was weaker than the one described by non-random sampling remained unchanged (Non-random sampling measures the occurrence but not the strength of a textbook trophic cascade, Ecology Letters, 2024).

Research has also examined trophic cascades from wolves to alders in Yellowstone, extending the analysis beyond aspen to other woody plant species (Trophic cascades from wolves to alders in Yellowstone, Forest Ecology and Management, 2015).

Behaviorally-Mediated Cascades

The mere threat of predation may incite behavioral changes in prey that lead to community-wide impacts. Experimental research has investigated whether simulated wolf presence can induce behaviorally-mediated trophic cascades. A study at the Cedar Creek Ecosystem Science Reserve in Minnesota, where wolves were recently removed, applied wolf urine to experimental plots and deployed camera traps to quantify how white-tailed deer adjusted their spatiotemporal habitat use, foraging, and vigilance.

Weekly applications of wolf urine significantly altered deer behavior, but deer responses did not cascade to affect plant or soil properties. Deer substantially reduced crepuscular activity at wolf-simulated sites compared to control locations. As wolves in this area predominantly hunted during mornings and evenings, this response potentially allows deer to maximize landscape use by accessing dangerous areas when temporal threat is low. The study concluded that prey may be sensitive to dynamic predation risk structured across both space and time, and prey use of risky areas during safe times may attenuate behaviorally-mediated trophic cascades (Behaviorally-mediated trophic cascade attenuated by prey use of risky places at safe times, Oecologia, 2021).

Mesopredator Effects

Wolves influence ecosystems through interactions with other carnivores. The competitive killing of coyotes by wolves and the subsequent effects on fox populations represent a documented intraguild trophic cascade.

Wolf-Coyote-Fox Dynamics

A continental-scale analysis of fur return data across eight jurisdictions in North America tested whether the presence or absence of wolves caused a continent-wide shift in coyote and red fox density. The results supported the existence of a continental scale cascade whereby coyotes outnumber red foxes in areas where wolves have been extirpated by humans, whereas red foxes outnumber coyotes in areas where wolves are present. However, for a distance of up to 200 km on the edge of wolf distribution, there is a transition zone where the effects of top-down control are weakened, possibly due to the rapid dispersal and reinvasion capabilities of coyotes into areas where wolves are sporadically distributed or at low densities (A continental scale trophic cascade from wolves through coyotes to foxes, Journal of Animal Ecology, 2015).

A more recent camera trap study in northern Michigan examined this intraguild cascade at a regional scale. Researchers established 348 remote camera sites across seven study areas of varying wolf density, including one area where wolves were absent. The study recorded more than 600,000 images with 6,370 wolf detections, 10,137 coyote detections, and 4,876 fox detections. Fox occupancy probability was more than three times as high at camera sites where wolves were present relative to sites where wolves were absent. Pairwise species interactions supported expected size-based dominance patterns among canids, with insignificant effects directionally consistent with reduced strength of top-down effects in peripheral wolf range (Marginal support for a trophic cascade among sympatric canids in peripheral wolf range, Ecology, 2021).

The same study found that increased edge density increased co-occurrence of coyotes and wolves, likely a function of increased prey availability and refugia for coyotes. Although foxes occurred in spatial proximity to wolves, competition was limited by greater temporal partitioning than observed between coyotes and foxes that were spatially segregated. The results provided marginal support for the reported trophic cascade among wolves, coyotes, and foxes, with top-down effects potentially reduced near the edge of wolf range.

Trophic Cascade Diagram

The following diagram illustrates the trophic relationships in a wolf-dominated ecosystem:

Wolves (Apex Predator)
    ↓ Direct predation and competitive killing
Elk / Deer / Moose (Primary Prey)
    ↓ Herbivory
Aspen / Willow / Shrubs (Vegetation)

Wolves
    ↓ Competitive killing
Coyotes (Mesopredator)
    ↓ Competitive killing
Red Foxes (Smaller Mesopredator)

This simplified representation shows the two main pathways of wolf ecological influence. The left pathway represents the classic trophic cascade from wolves through herbivores to vegetation. The right pathway represents the intraguild cascade from wolves through coyotes to foxes. Both pathways operate simultaneously in many ecosystems, though their relative strength varies with ecological context.

Case Study: Yellowstone Wolf Reintroduction

The reintroduction of wolves to Yellowstone National Park in 1995 created an unusual opportunity for a quasi-experimental test of wolf predation effects. The system had closely and consistently monitored top-down, bottom-up, and abiotic forces on prey population dynamics before and after reintroduction.

Elk Population Response

The before-after-control-impact analysis of elk populations revealed that recruitment declined by 35% in elk herds colonized by wolves. Annual population growth shifted from increasing to decreasing in these herds. The effects of population density and winter severity on recruitment, long recognized as important for elk dynamics, were detected in uncolonized herds and in wolf-colonized herds prior to wolf colonization, but not after wolf colonization. Growing season precipitation and harvest had no detectable effect on recruitment in either wolf treatment or colonization period, although harvest rates of juveniles to females declined by 37% in wolf-colonized herds (Ecosystem Scale Declines in Elk Recruitment and Population Growth with Wolf Colonization, PLoS ONE, 2014).

Vegetation Response

The vegetation response to wolf reintroduction has been the subject of ongoing scientific investigation. Early studies reported substantial aspen regeneration following wolf recovery. More recent research using random sampling methods has described a trophic cascade that is weaker than previously reported. The practice of sampling only the tallest young plants overestimated regeneration of overstory aspen by a factor of 4 to 7 compared to random sampling because it favored plants taller than the preferred browsing height of elk and overlooked non-regenerating aspen stands (Sampling bias exaggerates a textbook example of a trophic cascade, Ecology Letters, 2022).

Lessons from Yellowstone

The Yellowstone case demonstrates several important principles for understanding wolf ecology. First, wolf effects on prey populations can be substantial and measurable at ecosystem scales. Second, the strength of trophic cascades depends on sampling methodology, and non-random sampling can exaggerate ecological responses. Third, wolf effects interact with other ecological factors including climate, density dependence, and habitat conditions.

The Yellowstone model has been applied to other systems, including dingoes in Australia. Researchers have asked whether the Yellowstone wolf-elk-willow model applies to Australian ecosystems with dingoes as apex predators (Trophic cascades and dingoes in Australia: Does the Yellowstone wolf-elk-willow model apply?, Food Webs, 2017). The applicability of the model depends on ecological context, prey behavior, and environmental conditions.

Wolf Effects on Large Herbivore Conservation

Large wild herbivores are crucial to ecosystems and human societies. The 74 largest terrestrial herbivore species on Earth, those with body mass of at least 100 kg, face dramatic population declines and range contractions, with approximately 60% threatened with extinction. Nearly all threatened species are in developing countries, where major threats include hunting, land-use change, and resource depression by livestock. Loss of large herbivores can have cascading effects on other species including large carnivores, scavengers, mesoherbivores, small mammals, and ecological processes involving vegetation, hydrology, nutrient cycling, and fire regimes (Collapse of the world's largest herbivores, Science Advances, 2015).

Wolves as predators of large herbivores occupy a complex position in conservation. In some contexts, wolf predation contributes to declines of already threatened prey species. In other contexts, wolves are themselves the focus of conservation efforts. The ratio of ungulates to wolves in protected areas has been studied to understand carrying capacity and predator-prey balance, as documented in the Caucasian Nature Reserve (The Ratio of Ungulates to Wolves in the Caucasian Nature Reserve, Biology Bulletin, 2018).

Wolf Recolonization and Human Dimensions

The ongoing recolonization of Europe by wolves has generated substantial societal attention. An analysis of over 4000 online news articles from the Italian Alpine regions across a decade examined factors influencing media attitudes toward wolves. Negative media sentiment prevailed in recently recolonized areas, whereas positive attitudes emerged in regions with established wolf populations and at the national level. Negative sentiment correlated strongly with seasonal peaks in predation on livestock and proximity to regional, national, and European elections (Media attitudes toward wolves reflect recolonization phases, livestock predation peaks, and electoral cycles, Ambio, 2026).

This research reveals how spatial recolonization dynamics, human-wildlife conflicts, and electoral cycles collectively shape media framing of a recolonizing controversial carnivore. Conservation strategies must address human-wildlife conflict dynamics while acknowledging the politicized dimension surrounding the species.

Predator Recognition in Domestic Animals

The ecological role of wolves extends to their effects on domestic animals. Research on domestic horses has demonstrated that they can distinguish an unfamiliar predator from an unfamiliar non-predator based on visual cues alone. Eighteen horses showed significantly higher heart rate responses to wolf videos than to wombat videos. Heart rate also increased relative to baseline during wolf videos, whereas heart rate during wombat videos did not differ from baseline. There were no significant differences in heart rate responses to affiliative versus aggressive behaviors displayed by wolves. The age of the horses was negatively associated with fearfulness and social dependency, and male horses showed a more heightened heart rate response to unfamiliar predator cues (Recognition of unfamiliar predators in domestic horses through only visual predator cues, PLOS ONE, 2026).

These findings have practical implications for livestock management in wolf-occupied landscapes. Domestic animals retain predator recognition abilities even when raised under human protection, and their behavioral responses to wolf presence can affect stress levels, productivity, and welfare.

Forest Management and Wolf-Prey Dynamics

Anthropogenic disturbances compound with natural stressors to influence wildlife survival, particularly during vulnerable life stages. A study of juvenile moose in western Canada, where population declines coincided with extensive salvage logging following an insect outbreak, investigated how juvenile use of forest harvest features influenced mortality risk. Juvenile moose use of new cutblocks and higher road densities reduced their survival, presumably from increased predator and hunter efficiency in these habitats. Older cutblocks did not impact juvenile survival. Forest harvest appeared inherently risky, regardless of predation risk, forage, weather, juvenile condition, and long-term use. Juveniles with more winter ticks and yearlings with lower weights at capture had heightened mortality risk (Forest harvest and natural stressors compound to reduce juvenile ungulate survival, 2026).

These findings demonstrate that wolf predation on juvenile ungulates is mediated by habitat conditions and land management practices. Forest harvest features that increase predator efficiency can compound natural stressors and reduce prey survival.

Reforestation and Biodiversity Context

The ecological role of wolves connects to broader questions of habitat conservation and biodiversity. Reforestation is one of two established interventions for reversing forest loss, which is a leading cause of species extinction. A spatial analysis of overlap between 1,550 forest-obligate threatened species ranges and land that could be reforested found that reforestation on at least 43% of reforestable area, approximately 369 million hectares, could potentially benefit threatened vertebrates. The greatest opportunities are in the tropics, particularly Brazil and Indonesia (Global reforestation and biodiversity conservation, Conservation Biology, 2020).

While reforestation is not a substitute for forest conservation, it can contribute to habitat availability for prey species and the ecosystems that support wolf populations. Forest management decisions that affect ungulate habitat and predator efficiency have direct implications for wolf-prey dynamics.

Assessment Framework for Wolf Ecological Effects

For researchers and wildlife managers assessing wolf ecological effects, the following framework provides a structured approach based on the evidence reviewed.

Step 1: Define the Ecological Context

Identify the ecosystem type, prey species present, wolf population status, and historical context. Determine whether wolves are native, reintroduced, or recolonizing. Document baseline conditions for prey populations, vegetation, and other carnivores.

Step 2: Establish Monitoring Protocols

Implement random sampling methods for vegetation assessment. The Yellowstone case demonstrates that non-random sampling can overestimate trophic cascade strength by a factor of 4 to 7. Use standardized methods for prey population surveys, including juvenile to female ratios and population growth rates.

Step 3: Measure Direct Predation Effects

Document wolf predation rates on prey species. Use GPS tracking, scat analysis, and kill site identification. For dietary studies, combine field monitoring with genetic analysis of scat remains to identify individual prey and assess demographic impacts.

Step 4: Assess Mesopredator Interactions

Monitor coyote and fox populations in relation to wolf presence. Use camera trap arrays with sufficient spatial coverage to detect occupancy patterns. Consider edge effects and transition zones where wolf effects may be weakened.

Step 5: Evaluate Behaviorally-Mediated Effects

Assess prey behavioral responses to wolf presence, including habitat use, temporal activity patterns, and vigilance behavior. Experimental approaches using predator cues can isolate behavioral from consumptive effects.

Step 6: Integrate with Land Management

Consider how habitat management, including forest harvest, road density, and reforestation, interacts with wolf predation effects. Document how anthropogenic disturbances compound with natural stressors to influence prey survival.

Records and Measurements

Wildlife researchers and managers should maintain the following records for assessing wolf ecological effects:

Common Failure Patterns in Wolf Ecology Assessment

Several common errors can undermine accurate assessment of wolf ecological effects.

Non-Random Vegetation Sampling

The most documented failure pattern is the practice of sampling only the tallest young plants. This technique overestimates regeneration by favoring plants taller than the preferred browsing height of prey and overlooking non-regenerating stands. Random sampling is essential for accurate assessment of trophic cascade strength.

Ignoring Edge Effects

Wolf effects weaken near the edge of wolf distribution. Studies of small areas may not be indicative of the effects of top-down mesopredator control. Large carnivores may need to occupy large continuous areas to facilitate among-carnivore cascades.

Confounding Behavioral and Consumptive Effects

Behavioral responses to wolf presence do not necessarily cascade to affect plant or soil properties. Prey may use risky areas during safe times, attenuating behaviorally-mediated trophic cascades. Distinguishing behavioral from consumptive effects requires experimental approaches.

Overlooking Interactive Effects

Wolf predation interacts with other limiting factors including density dependence, winter severity, and habitat conditions. Attributing all prey population changes to wolf predation overestimates wolf effects.

Limitations of Current Evidence

The scientific evidence on wolf ecological effects has important limitations. The Yellowstone trophic cascade, while extensively studied, has been shown to be weaker than initially reported when random sampling methods are used. The strength of trophic cascades varies across ecosystems, and findings from one system may not apply to others.

Behaviorally-mediated trophic cascades remain controversial due to the paucity of experimental manipulations in wide-ranging vertebrate systems. The Cedar Creek experiment demonstrated that wolf olfactory cues can alter deer behavior, but these behavioral changes did not cascade to affect plant or soil properties.

Intraguild cascades among wolves, coyotes, and foxes have been documented at continental scales, but regional studies provide only marginal support, particularly near the edge of wolf range. The mechanisms underlying these interactions, including competitive killing versus intraguild predation, require further investigation.

Professional Escalation Criteria

Wildlife managers and researchers should escalate concerns to appropriate authorities under the following circumstances:

Frequently Asked Questions

What is a trophic cascade and how do wolves fit into this concept?

A trophic cascade occurs when predators indirectly affect organisms at lower trophic levels through their effects on intermediate species. Wolves as apex predators can initiate trophic cascades by suppressing prey populations or altering prey behavior, which in turn affects vegetation. The concept has been influential in ecology, but researchers continue to refine its definition to ensure consistent application in management and conservation (What is a Trophic Cascade?, Trends in Ecology & Evolution, 2016).

How do wolves affect elk populations in Yellowstone?

A before-after-control-impact analysis of 33 years of data from 12 elk population segments found that recruitment declined by 35% in herds colonized by wolves, with annual population growth shifting from increasing to decreasing. Liberal estimates of wolf predation rates on juvenile elk could explain no more than 52% of the total decline in juvenile to female ratios, indicating that wolf predation interacts with other limiting factors (Ecosystem Scale Declines in Elk Recruitment and Population Growth with Wolf Colonization, PLoS ONE, 2014).

Do wolves affect coyote and fox populations?

Yes. Continental-scale fur return data across eight jurisdictions in North America showed that coyotes outnumber red foxes in areas where wolves have been extirpated, whereas red foxes outnumber coyotes in areas where wolves are present. A transition zone of up to 200 km on the edge of wolf distribution shows weakened top-down control (A continental scale trophic cascade from wolves through coyotes to foxes, Journal of Animal Ecology, 2015).

Is the Yellowstone wolf-elk-willow trophic cascade as strong as originally reported?

The strength of the Yellowstone trophic cascade has been revised downward. Non-random sampling that measured only the tallest young aspen overestimated regeneration by a factor of 4 to 7 compared to random sampling. Random sampling described a trophic cascade, but it was weaker than the one that non-random sampling described (Sampling bias exaggerates a textbook example of a trophic cascade, Ecology Letters, 2022).

Can the fear of wolves alone change prey behavior and affect ecosystems?

Experimental research at Cedar Creek Ecosystem Science Reserve found that wolf urine application significantly altered deer behavior, with deer reducing crepuscular activity at wolf-simulated sites. However, these behavioral changes did not cascade to affect plant or soil properties. Prey use of risky areas during safe times may attenuate behaviorally-mediated trophic cascades (Behaviorally-mediated trophic cascade attenuated by prey use of risky places at safe times, Oecologia, 2021).

How do wolves affect juvenile ungulate survival?

Wolf predation can be a major source of juvenile ungulate mortality. In a study of juvenile moose in western Canada, wolf predation accounted for 55.1% of mortalities. Juvenile moose use of new cutblocks and higher road densities reduced survival, presumably from increased predator efficiency in these habitats (Forest harvest and natural stressors compound to reduce juvenile ungulate survival, 2026).

Can wolves specialize on particular prey species?

Yes. In northwestern Portugal, researchers documented wolf dietary specialization on free-ranging horses, with horses comprising 85% and 93% of wolf consumed biomass in 2017 and 2018 respectively. Genetic analyses identified 39 horses from wolf feeding sites and scat remains, with predation affecting foals, juveniles, and adults (Unveiling wolf dietary specialization on free ranging horses using forensic genetics and field monitoring, Scientific Reports, 2026).

How do domestic animals respond to wolf presence?

Domestic horses can distinguish an unfamiliar predator from an unfamiliar non-predator based on visual cues alone. Horses showed significantly higher heart rate responses to wolf videos than to wombat videos, with heart rate increasing relative to baseline during wolf videos. These responses have implications for livestock welfare in wolf-occupied landscapes (Recognition of unfamiliar predators in domestic horses through only visual predator cues, PLOS ONE, 2026).

Related Articles

• Genomic Health
• Genomic Health
• Genomic Health
• biology study guide
• populations biology

References and Further Reading

• NCBI Literature Resources. National Center for Biotechnology Information.
• PubMed. National Library of Medicine.
• What is a Trophic Cascade?. Trends in ecology & evolution, 2016.
• Marginal support for a trophic cascade among sympatric canids in peripheral wolf range.. Ecology, 2021.
• Sampling bias exaggerates a textbook example of a trophic cascade.. Ecology letters, 2022.
• Behaviorally-mediated trophic cascade attenuated by prey use of risky places at safe times.. Oecologia, 2021.
• Non-random sampling measures the occurrence but not the strength of a textbook trophic cascade.. Ecology letters, 2024.
• Global reforestation and biodiversity conservation.. Conservation biology : the journal of the Society for Conservation Biology, 2020.
• Collapse of the world's largest herbivores.. Science advances, 2015.
• A continental scale trophic cascade from wolves through coyotes to foxes.. The Journal of animal ecology, 2015.
• Unveiling wolf dietary specialization on free ranging horses using forensic genetics and field monitoring.. 2026.
• Media attitudes toward wolves reflect recolonization phases, livestock predation peaks, and electoral cycles.. 2026.
• Forest harvest and natural stressors compound to reduce juvenile ungulate survival. 2026.
• Recognition of unfamiliar predators in domestic horses through only visual predator cues.. 2026.
• Ecosystem Scale Declines in Elk Recruitment and Population Growth with Wolf Colonization: A Before-After-Control-Impact Approach. PLoS ONE, 2014.
• The Ratio of Ungulates to Wolves in the Caucasian Nature Reserve. Biology Bulletin, 2018.
• Trophic cascades in Yellowstone: The first 15years after wolf reintroduction. Biological Conservation, 2012.
• Trophic cascades and dingoes in Australia: Does the Yellowstone wolf-elk-willow model apply?. Food Webs, 2017.
• Trophic cascades from wolves to alders in Yellowstone. Forest Ecology and Management, 2015.

This article is educational and does not replace institutional policy, professional advice, or applicable safety and regulatory requirements.