Liba Pejchar

Liba Pejchar
Colorado State University | CSU · Department of Fish, Wildlife and Conservation Biology

PhD

About

98
Publications
41,849
Reads
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6,070
Citations
Citations since 2017
60 Research Items
3499 Citations
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Introduction
My research explores opportunities to conserve and restore biodiversity on working lands while also sustaining the livelihoods of landowners. With my amazing students, I address topics ranging from the effects of refaunation and introduced species on biodiversity and ecosystem function, to how to sustain plant and animal communities in landscapes dominated by agricultural production, residential development, and energy extraction.
Additional affiliations
July 2021 - present
Colorado State University
Position
  • Professor
July 2015 - June 2021
Colorado State University
Position
  • Professor (Associate)
August 2008 - June 2015
Colorado State University
Position
  • Professor (Assistant)

Publications

Publications (98)
Article
Keynote and plenary speakers at professional conferences serve as highly visible role models for early-career scientists and provide recognition of scientific excellence. This recognition may be particularly important for women, who are underrepresented in senior positions in the biological sciences. To evaluate whether conferences fulfill this pot...
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Residential development is a leading driver of land-use change, with important implications for biodiversity, ecosystem processes, and human well-being. We reviewed over 500 published scientific articles on the biophysical, economic, and social effects of residential development and open space in the US. We concluded that current knowledge of the e...
Article
Ecological restoration is critical for recovering biodiversity and ecosystem services, yet designing interventions to achieve particular outcomes remains fraught with challenges. In the extensive regions where non-native species are firmly established, it is unlikely that historical conditions can be fully reinstated. To what degree, and how rapidl...
Article
Private lands provide important habitat for biodiversity and are critical to many conservation efforts. With increasing awareness of the importance of private lands, a broad suite of strategies to engage landowners in conservation is emerging. The success of these strategies is contingent on a skilled workforce of conservation practitioners that ca...
Article
Habitat alteration to benefit hunted species has been implemented for centuries. These practices are most prevalent on public and private lands where management is funded through hunting licenses and hunting tourism. Habitat management for game species is globally widespread and can take diverse forms — e.g. tree reduction to enhance forage for dee...
Article
Conservation across jurisdictional boundaries can help achieve recovery goals for species at risk, provide funding for conservation actions by private landowners, and reduce regulatory burdens. Habitat crediting programs, a type of offsite mitigation, are a relatively new form of cross-boundary conservation. To better understand the current status...
Article
Urban development drives habitat loss and degradation, which often leads to species extirpation. Urban habitat enhancement programs encourage the public to protect or improve the quality of habitat for native or human-sensitive species within the urban matrix. These programs are increasingly common, yet their effectiveness is rarely evaluated. Here...
Article
With growing evidence of widespread health and environmental impacts from oil and gas activity, localities and states are beginning to develop protective measures. Interdisciplinary approaches that integrate across human, wildlife, domesticated animal, and land health are likely to provide more just and comprehensive solutions than would be possibl...
Article
Hiring diverse candidates and creating an inclusive and equitable climate has emerged as a top priority for the scientific community. Diversity statements are a common but unexamined tool for recruiting a more diverse workforce. We surveyed more than 200 experts in diversity, equity, and inclusion (DEI) from US academic institutions to synthesize s...
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Phenological shifts are a widely studied consequence of climate change. Little is known, however, about certain critical phenological events, nor about mechanistic links between shifts in different life-history stages of the same organism. Among angiosperms, flowering times have been observed to advance with climate change, but, whether fruiting ti...
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Habitat exchange programs, a form of biodiversity offsetting, aim to compensate for negative impacts in one area by conservation in another. A newer subset of habitat exchange programs includes programs that have three distinct characteristics: they allow for temporary (as opposed to only permanent) credits; they are centralized and overseen by non...
Article
For centuries, communities around the globe have worked together to manage resources—a process often referred to as community-based conservation. More recently in the US, diverse stakeholders have partnered to address complex environmental issues that span land ownership or administrative boundaries, calling these efforts collaborative conservation...
Article
Biological invasions are a leading driver of biodiversity loss and population declines worldwide. While much research has focused on understanding the effects of long-distance (e.g., cross-continental) invasion, the potential impacts of species that invade close to or within their native ranges are relatively understudied. We investigated the effec...
Article
Bison serve as keystone species in prairie ecosystems of North America, yet few studies have evaluated the effects of bison carcasses on other animals. To determine which species forage on bison carcasses and whether such carcasses catalyze intraspecific and interspecific interactions, we used wildlife cameras to observe scavenger visits and activi...
Article
Restoring free-roaming mammals that fill critical ecological roles requires large connected landscapes that cross jurisdictional boundaries. Plains bison, once nearly extirpated from North America, are now confined to several larger free-roaming herds and a number of small fenced herds in regions where they are often managed as livestock rather tha...
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The understanding that motherhood impacts career paths is so pervasive among early-career scientists that some feel they must choose parenthood or a career. The penalties associated with motherhood can contribute to the “leaky pipeline,” which equates to the high attrition rate of women due to social, economical, or temporal factors as they proceed...
Article
Islands are epicenters of animal extinctions and population declines. These losses exacerbate biodiversity loss and disrupt ecological services in areas of high endemism. Island defaunation is primarily driven by invasive mammalian predators, and mammal eradications are reversing population declines for some island species. Invasive mammal eradicat...
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Community science, the enlisting of volunteers to collect biodiversity data, is now common and widespread. In theory, the benefits of this model are complementary: community science programs produce useful datasets while engaging the public in conservation. However, in practice there may be tradeoffs regarding data quality, economic cost, and publi...
Article
Invasive species are a leading driver of global change, with consequences for biodiversity and society. Because of extraordinary rates of endemism, introduction, and extinction, Hawaii offers a rich platform for exploring the cross-disciplinary challenges of managing invasive species in a dynamic world. We highlight key successes and shortcomings t...
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Aim Human development and agriculture can have transformative and homogenizing effects on natural systems, shifting the composition of ecological communities towards non‐native and native species that tolerate or thrive under human‐dominated conditions. These impacts cannot be fully captured by summarizing species presence, as they include dramatic...
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The distribution and abundance of plants across the world depends in part on their ability to move, which is commonly characterized by a dispersal kernel. For seeds, the total dispersal kernel (TDK) describes the combined influence of all primary, secondary, and higher-order dispersal vectors on the overall dispersal kernel for a plant individual,...
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Although dispersal is generally viewed as a crucial determinant for the fitness of any organism, our understanding of its role in the persistence and spread of plant populations remains incomplete. Generalizing and predicting dispersal processes are challenging due to context dependence of seed dispersal, environmental heterogeneity, and interdepen...
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A diverse and inclusive scientific community is more productive, innovative and impactful, yet ecology and evolutionary biology continues to be dominated by white male faculty. We quantify faculty engagement in activities related to diversity and inclusion and identify factors that either facilitate or hinder participation. Through a nationwide sur...
Article
Conservation Development (CD) is a land-use tool to reduce the impacts of development on natural resources, yetthe use of CD is highly variable. We used a collaborative conservation model to examine factors influencing adoption and implementation to improve the future application of CD. We interviewed 2–3 individuals including planners, board membe...
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Seed dispersal enables plants to reach hospitable germination sites and escape natural enemies. Understanding when and how much seed dispersal matters to plant fitness is critical for understanding plant population and community dynamics. At the same time, the complexity of factors that determine if a seed will be successfully dispersed and subsequ...
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Bison were instrumental in shaping North America's Great Plains. Interest in restoring this iconic species and their ecological role in grassland ecosystems is rapidly gaining momentum. To evaluate the potential for bison to enhance habitat quality for wildlife and catalyze public engagement in grassland conservation, we assessed both the ecologica...
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Full-text available
Bison were instrumental in shaping North America's Great Plains. Interest in restoring this iconic species and their ecological role in grassland ecosystems is rapidly gaining momentum. To evaluate the potential for bison to enhance habitat quality for wildlife and catalyze public engagement in grassland conservation, we assessed both the ecologica...
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Full-text available
Non-native plants can impact riparian ecosystem function through diverse terrestrial and aquatic pathways, with cascading effects on food webs. Invasion-mediated vegetation changes can depress terrestrial arthropod communities and alter arthropod flux across the aquatic-terrestrial interface. We investigated the effects of a non-native woody plant,...
Data
Aquatic carbon diet components. Comparison of aquatic carbon contributions to songbird diets across species and years, based on data pooled across reference and invaded sites. Mean estimates of % aquatic carbon ± SE were calculated using a single isotope mixing formula and δ13C signatures of insect and fecal samples. The terrestrial-derived diet co...
Data
Insect isotopes. Biplots showing δ13C and δ15N signatures of aquatic (gray) and terrestrial insect taxa (black) used as an index of songbird diet sources in 2015 (top) and 2016 (bottom). Common names of taxa are displayed near the mean. (TIF)
Data
Sample sizes. Number of fecal samples collected from songbird species at sites uninvaded (reference) and invaded by R. neomexicana in the Clear Creek drainage of northwestern Colorado, USA. Common names of songbird species are listed in taxonomic order. Cordilleran flycatchers and dusky flycatchers were analyzed together as flycatchers. Black-cappe...
Data
Raw data used for all analyses. (XLSX)
Article
Large-scale bird monitoring can provide valuable insights about drivers of population change across different spatial and temporal scales. Yet, challenging terrain and survey costs hinder the collection of data needed to estimate absolute abundance or population densities for New Zealand’s forest birds. Acoustic sampling is being used more frequent...
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Island species are disproportionately threatened with extinction, and invasive species are the primary driver of biodiversity loss. Globally, eradicating invasive mammals from small oceanic islands has led to the recovery of threatened populations, but eradicating mammals from large islands and continents is more challenging. In New Zealand, conser...
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The codling moth Cydia pomonella L. (Lepidoptera: Tortricidae) is a major economic pest in organic apple orchards. Observational methods, prey removal experiments and correlative experiments with exclosures or nest boxes have demonstrated that birds contribute to the removal of this insect pest. However, the majority of research conducted in the la...
Article
Riverine systems often spread non-native species, yet the co-occurring impacts of introduced riparian vegetation on aquatic- and terrestrial-derived resources are unknown. We compared aquatic and terrestrial arthropod communities and their flux into and out of streams in riparian reaches invaded and uninvaded by Robinia neomexicana, a woody plant i...
Article
Incorporating both ecosystem services and disservices into land-use decisions is essential for meeting conservation and livelihood goals. We discuss the merits and challenges of this concept, termed net effects, for birds in agroecosystems. Although birds have widely documented impacts on agriculture (e.g., pest control, crop damage), the net effec...
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The effects of non-native plants on habitat use are well studied; however, whether introduced plants negatively influence reproductive output of animal populations has received much less attention. We conducted a systematic literature review to evaluate the influence of non-native plants on reproductive performance in songbirds. Our global search r...
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Understanding patterns of participation in private lands conservation, which is often implemented voluntarily by individual citizens and private organizations, could improve its effectiveness at combating biodiversity loss. We used social network analysis (SNA) to examine participation in conservation development (CD), a private land conservation s...
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Hawaii has experienced a catastrophic decline in frugivorous native birds coupled with the introduction of non-native species. Puaiohi (Myadestes palmeri), a critically endangered thrush, is the sole extant native songbird capable of dispersing fleshy fruited plants in the rainforest of Kauai island, Hawaii. As this species has declined to occupy a...
Data
Dietary overlap between native (Puaiohi) and introduced (Japanese White-eye) frugivorous birds. Overlap was calculated using Pianka’s index. (DOCX)
Data
Relative abundance of plant species and fruit in two study sites on Kauai. Statistically significant differences among relative plant and fleshy-fruit abundance are indicated with an asterisk (*). (DOCX)
Article
Conservation Development (CD) is a strategy for conserving private lands with the potential to protect biodiversity while meeting growing demands for housing. Although CD is increasingly common, little is known about how CDs are implemented, and whether developers and homeowners follow best practices and achieve conservation objectives. We formally...
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As the largest terrestrial biomes, crop and pasturelands can have very large positive or negative impacts on biodiversity and human well-being. Understanding how animals use and impact agroecosystems is important for making informed decisions that achieve conservation and production outcomes. Yet, few studies examine the tradeoffs associated with w...
Data
Generalized linear mixed model predictor variables. Predictor variables included as covariates for comparison of C. pomonella damage related to bird access, apple block and apple characteristics. (DOCX)
Data
Generalized linear mixed model selection results. AICc model selection results, investigating orchard and landscape characteristics affecting the proportion of C. pomonella damage as assessed in the exclosure experiment. Number of parameters (k), model weight, and log likelihood values are also reported. Apple block was included as a random effect...
Data
Bird species detected in organic apple study sites. Common and scientific names of 59 species listed in American Ornithologists’ Union (AOU) order. Species were assigned as human-adapted (n = 40) or human-sensitive (n = 19) based upon the corresponding reference. When previous studies regarding species’ response to urbanization or housing density w...
Data
Occupancy model variables. Predictor variables included as covariates in single-season occupancy models for human-adapted and human-sensitive species for Ψ1 (psi; probability that a unit is occupied/used) and site and survey covariates for pj (probability that species is detected in a unit in survey j, given presence). ArcGIS calculations made usin...
Data
Transect survey locations by species. Frequency counts for the locations where each human-adapted or human-sensitive species was detected. The adjacent shrub/tree habitat showed the greatest number of species (n = 43) while the adjacent grass habitat had the fewest (n = 21) and apple blocks were intermediate (n = 37). Encounter histories were used...
Article
Using habitat mitigation to minimize or offset negative impacts of land use change on biodiversity is increasingly common and widespread. For example, where natural disturbance is undesirable (e.g., wildfire in oil and gas fields), mechanical approaches are frequently used to replace natural disturbance and improve habitat for particular species. H...
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Full-text available
Large-scale land-use change driven by residential development has degraded native ecosystems and altered the composition of species communities. Concern over the loss of habitat for human-sensitive species has led to questions about how housing impacts bird communities along the urban to rural gradient. Yet most studies of birds in residential ecos...
Article
Developing effective tools for conservation on private lands is increasingly important for global biodiversity conservation; private lands are located in more productive and biologically diverse areas, and they face accelerated rates of land conversion. One strategy is conservation development (CD) subdivisions, which cluster houses in a small port...
Article
Woodland reduction has been under way for decades to improve habitat for certain wildlife species, increase forage for livestock, improve watershed function and reduce soil erosion, and increase plant community heterogeneity. Land managers have implemented a variety of techniques to reduce woodlands. Yet most studies on outcomes are observational a...
Article
Forested ecosystems in the western United States have been the focus of tree reduction efforts for decades, with the intent of improving forage for livestock and wildlife. Yet, the long-term consequences of tree removal for biodiversity are virtually unknown. We conducted bird and vegetation surveys in northwestern Colorado where trees were mechani...
Article
Removing tree cover is a common forest management practice, and pinyon-juniper woodlands in the western United States have been the focus of tree reduction efforts for decades. The scale and intensity of tree removal practices are expected to increase as technology advances and as land managers are tasked with meeting multiple objectives, including...
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Limited resources for biodiversity conservation demand strategic science-based recovery efforts, particularly on islands, which are global hotspots of both endemism and extinction. The Akikiki (Oreomystis bairdi) and the Akekee (Loxops caeruleirostris) are critically endangered honeycreepers endemic to the Hawaiian island of Kauai. Recent declines...
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The widespread loss of native species and the introduction of non-native species has important consequences for island ecosystems. Non-native species may or may not functionally replace the role of native species in ecological processes such as seed dispersal. Although the majority of Hawaii's native plants require bird-mediated seed dispersal, onl...
Article
Scientists are increasingly using Twitter as a tool for communicating science. Twitter can promote scholarly discussion, disseminate research rapidly, and extend and diversify the scope of audiences reached. However, scientists also caution that if Twitter does not accurately convey science due to the inherent brevity of this media, misinformation...
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Society's growing demand for clean and abundant energy has repercussions for biodiversity and human well-being. Directives for renewable energy, energy security, and technological advancements such as horizontal drilling in conjunction with hydraulic fracturing have spurred a rapid increase in alternative and unconventional energy production over t...
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Due to habitat loss, disease, and introduction of nonnative species, many native species in Hawai‘i have gone extinct or are at risk of extinction. As a result of interspecific interactions such as pollination, the decline, loss, or introduction of species can have cascading effects on island ecosystems. We studied Hylaeus spp., Hawai‘i’s yellow-fa...
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Full-text available
Due to habitat loss, disease, and introduction of nonnative species, many native species in Hawai‘i have gone extinct or are at risk of extinction. As a result of interspecific interactions such as pollination, the decline, loss, or introduction of species can have cascading effects on island ecosystems. We studied Hylaeus spp., Hawai‘i's yellow-fa...
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Full-text available
An age-old conflict around a seemingly simple question has resurfaced: why do we conserve nature? Contention around this issue has come and gone many times, but in the past several years we believe that it has reappeared as an increasingly acrimonious debate between, in essence, those who argue that nature should be protected for its own sake (intr...
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Energy production in the United States is in transition as the demand for clean and domestic power increases. Wind energy offers the benefit of reduced emissions, yet, like oil and natural gas, it also contributes to energy sprawl. We used a diverse set of indicators to quantify the ecological impacts of oil, natural gas, and wind energy developmen...
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Globally, most restoration efforts focus on re-creating the physical structure (flora or physical features) of a target ecosystem with the assumption that other ecosystem components will follow. Here we investigate that assumption by documenting biogeographical patterns in an important invertebrate taxon, the parasitoid wasp family Ichneumonidae, i...
Data
All plant species identified during vegetation sampling. (DOCX)
Article
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Species loss can lead to cascading effects on communities, including the disruption of ecological processes such as seed dispersal. The endangered 'Alalā (Corvus hawaiiensis), the largest remaining species of native Hawaiian forest bird, was once common in mesic and dry forests on the Big Island of Hawai'i, but today it exists solely in captivity....
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A b s t r a c t Conservation development (CD) is an approach to the site design of a development property that combines residential development and land conservation. CD has been heralded as an environmentally-friendly development alternative and a means to finance land conservation. We employ a Box-Cox hedonic methodology using transaction data fo...
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This chapter reviews the literature to understand the significance of making decisions about the prevention and/or control of invasive alien species (IAS) that ignore impacts on ecosystem services. It reports damage costs associated with IAS in monetary terms. The costs presented for various provisioning, regulating, and cultural services may be ro...
Article
Although the effects of invasive alien species (IAS) on native species are well documented, the many ways in which such species impact ecosystem services are still emerging. Here we assess the costs and benefits of IAS for provisioning, regulating and cultural services, and illustrate the synergies and tradeoffs associated with these impacts using...