Travis Longcore

Travis Longcore
University of California, Los Angeles | UCLA · Institute of the Environment and Sustainability

Ph.D.

About

124
Publications
67,293
Reads
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4,292
Citations
Introduction
Dr. Travis Longcore is Associate Adjunct Professor at the UCLA Institute of the Environment and Sustainability. Dr. Longcore’s research is focused on nature in cities and makes use of diverse statistical tools, fieldwork, and geographic information systems. His landmark article “Ecological Light Pollution” (Longcore and Rich 2004) and 2006 co-edited book Ecological Consequences of Artificial Night Lighting (Island Press) have come to define a new and rapidly growing research area in ecology.
Additional affiliations
August 2015 - May 2019
University of Southern California
Position
  • Professor (Assistant)
July 2010 - August 2015
University of Southern California
Position
  • Associate Professor (Research)
January 2000 - June 2007
University of California, Los Angeles
Position
  • Lecturer
Education
September 1995 - December 1999

Publications

Publications (124)
Article
Full-text available
Exposure to artificial light at night (ALAN) is a significant factor in ecological and epidemiological research. Although levels of exposure are frequently estimated from satellite-based measurements of upward radiance, and the correlation between upward radiance and zenith sky brightness is established, the correlation between upward radiance and...
Article
Full-text available
Airborne particulate matter is a significant concern to human health, but the effects of the deposition of dust on other species in the wild has not been well investigated. The vulnerability of insects to mineral dusts has been well known from agricultural management and the current co-occurrence of endangered species with dust-producing industry m...
Article
Full-text available
Artificial light at night (ALAN) is closely associated with modern societies and is rapidly increasing worldwide. A dynamically growing body of literature shows that ALAN poses a serious threat to all levels of biodiversity - from genes to ecosystems. Many “unknowns” remain to be addressed however, before we fully understand the impact of ALAN on b...
Article
This study covers the role of exposure to artificial light at night (ALAN) in shaping the spatial distributions of two species of conservation concern, roosting sites of the Western Snowy Plover and locations of California Grunion spawning runs, along the coast of southern California. Observational data on plover and grunions, derived from communit...
Article
Full-text available
Only two-thirds of Americans meet the recommended 7 hours of sleep each night. Insufficient sleep and disruptions in circadian rhythm have been associated with numerous adverse health outcomes, including diabetes and cardiovascular disease. Several environmental disruptors of sleep have been previously reported, such as artificial light at night (A...
Article
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Free-roaming domestic cats (i.e., cats that are owned or unowned and are considered ‘at large’) are globally distributed non-native species that have marked impacts on biodiversity and human health. Despite clear scientific evidence of these impacts, free-roaming cats are either unmanaged or managed using scientifically unsupported and ineffective...
Article
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Artificial light at night (ALAN) has been massively deployed worldwide and has become a major environmental pressure for biodiversity, especially contributing to habitat loss and landscape fragmentation. To mitigate these latter, green and blue infrastructure policies have been developed throughout the world based on the concept of ecological netwo...
Article
Full-text available
In nature, light is a key driver of animal behaviour and physiology. When studying captive or laboratory animals, researchers usually expose animals to a period of darkness, to mimic night. However, ‘darkness’ is often poorly quantified and its importance is generally underappreciated in animal research. Even small differences in nocturnal light co...
Article
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The physiology and behavior of most life at or near the Earth’s surface has evolved over billions of years to be attuned with our planet’s natural light–dark cycle of day and night. However, over a relatively short time span, humans have disrupted this natural cycle of illumination with the introduction and now widespread proliferation of artificia...
Technical Report
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This report analyses all artificial interference that can have a negative impact on the visibility of the night sky. These interferences can be logically grouped into three categories according to type. The first category refers to the effect caused by the artificial emission of visible light during the night, also known as ALAN (Artificial Light A...
Article
Full-text available
• New infrastructure development in previously natural environments is introducing light pollution to habitats at an unprecedented rate, which has the potential to be devastating for native insect assemblages. • We evaluated insect attraction to three lamp types emitting different spectra of light (white, yellow‐filtered and amber‐filtered ~3000 K...
Preprint
Full-text available
According to archaeological records, chickpea ( Cicer arietinum ) was first domesticated in the Fertile Crescent 10 thousand years ago. Its subsequent diversification in South Asia, Ethiopia, and the Western Mediterranean, however, remains obscure and cannot be resolved using only archeological and historical evidence. In particular, chickpea has t...
Article
Full-text available
Background Outdoor artificial light at night (ALAN) has been implicated in a growing number of adverse health outcomes. ALAN is believed to disrupt circadian rhythms and has been associated with increased inflammation, one of the hallmarks of cancer. We examined the association between outdoor ALAN and a cancer strongly associated with autoimmune a...
Article
Introduction Artificial light at night (ALAN) is believed to disrupt sleep by suppressing melatonin and altering normal circadian patterns. We assessed the association between self-reported sleep measures and outdoor ALAN in a large cohort of women. Methods The California Teachers Study (CTS) is a prospective cohort of 133,479 current and former C...
Article
Full-text available
From the position of wildlife, the best artificial light at night is no artificial light at night. Recognizing that this is not feasible while maintaining safety and achieving other goals, I have focused on evaluating spectrum as an approach to minimizing impacts to wildlife and, more broadly, to the night sky, ecosystems, and humans. The most usef...
Article
Resettlement of local people from protected areas (PAs) has been regarded as a preferred method to alleviate human disturbance and environmental pressure. Lack of knowledge about local communities' perceptions of resettlement, however, can lead to failed relocation projects and negative impacts on environmental sustainability and livelihoods. To be...
Article
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This article was originally published electronically on the publisher’s internet portal (currently SpringerLink) on April 3, 2019 without open access.
Article
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One Health is a collaborative, interdisciplinary effort that seeks optimal health for people, animals, plants, and the environment. Toxoplasmosis, caused by Toxoplasma gondii, is an intracellular protozoan infection distributed worldwide, with a heteroxenous life cycle that practically affects all homeotherms and in which felines act as definitive...
Article
Full-text available
The vegetation of Santa Catalina Island has been significantly transformed through a history of introduction of exotic plant species and disturbance by large introduced herbivores. Many of these disturbances have been reduced in recent decades, using measures such as carefully controlling the number of bison and removing cattle, sheep, feral pigs,...
Article
Full-text available
Misinformation (or denialism), the disingenuous assertion of information contradicting overwhelming scientific consensus, increasingly poses a challenge for invasion biology. The issue of free-ranging domestic cats (Felis catus) provides an example of this misinformation: overwhelming consensus shows that cats are invasive species that impact wildl...
Article
Full-text available
The article Responding to misinformation and criticisms regarding United States cat predation estimates, written by Scott R. Loss, Tom Will, Travis Longcore, Peter P. Marra was originally published electronically on the publisher’s Internet portal (currently SpringerLink) on 13 July 2018 without open access.
Article
Full-text available
The introduction and widespread uptake of LEDs as outdoor lighting has caused no small amount of concern amongst conservation biologists. The prevailing impression that LEDs are always blue-white is well founded as adoption of LEDs for streetlights were invariably high color temperatures and with the deterioration of phosphors the blue wavelengths...
Article
Full-text available
Conservation geneticists have argued that evolutionarily significant units (ESUs) must be both genetically distinct and adaptively significant to be recognized for conservation protection. High-throughput DNA approaches can greatly increase the power to identify genetic distinctiveness, even if inferring adaptive significance remains a challenge. H...
Article
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Environmental planners often rely on transportation structures (i.e., underpasses, bridges) to provide connectivity for animals across developed landscapes. Environmental assessments of predicted environmental impacts from proposed developments often rely on literature reviews or other indirect measures to establish the importance of wildlife cross...
Article
Light sources attract nocturnal flying insects, but some lamps attract more insects than others. The relation between the properties of a light source and the number of attracted insects is, however, poorly understood. We developed a model to quantify the attractiveness of light sources based on the spectral output. This model is fitted using data...
Article
Full-text available
For many decades, the spectral composition of lighting was determined by the type of lamp, which also influenced potential effects of outdoor lights on species and ecosystems. Light‐emitting diode (LED) lamps have dramatically increased the range of spectral profiles of light that is economically viable for outdoor lighting. Because of the array of...
Article
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Wildlife crossing structures (WCS) over or under highways have been proposed as a solution for road-related habitat fragmentation and wildlife collisions. To assure the efficacy of WCS, road related negative impacts that could cause animals to avoid WCS, such as noise and light, need to be considered. Human-sourced noise can affect habitat occupanc...
Poster
Full-text available
This poster documents the analysis of point detections of lighted boats off the Pacific Coast of the United States. The patterns observed in the 2016-2017 period are consistent with the boats being part of the light-induced squid fishery. We show variation in the distribution of boats through the year and in response to the weekend closure of the s...
Poster
Full-text available
Currently light pollution is a significant problem for our public lands and its impact has only worsened over the past several decades. Affordable measurement techniques are not well developed so this study was the first extensive trial of a new method for light pollution monitoring in the US. Existing methods are very expensive and require high le...
Technical Report
A captive propagation program for the Lange’s metalmark butterfly (Apodemia mormo langei) is in place to serve as an insurance population in the event of a catastrophic event befalling the wild population and to provide captive-reared stock to reinforce the existing population or to be released to establish new populations. During the period Octobe...
Article
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Understanding the relative importance of environmental and anthropogenic factors in driving plant community structure, including relative dominance of native and non-native species, helps predict community responses to biological invasions. To assess factors influencing plant communities on San Clemente Island, USA, we conducted an islandwide veget...
Article
Light pollution has been of increasing concern as it relates to protected areas. As such, natural resource managers need information on the distribution, intensity, and dynamics of nighttime lights in protected areas. We examine the extent of nighttime light brightness from 1992 to 2012 in the Mediterranean Coast Network (Santa Monica Mountains Nat...
Article
Single-family residential neighborhoods make up large areas within cities and are undergoing change as residences are renovated and redeveloped. We investigated the effects of such residential redevelopment on land cover (trees/shrubs, grass, building, and hardscape) in the 20 largest cities in the Los Angeles Basin from 2000 to 2009. We identified...
Chapter
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Since the invention of the electric light bulb in 1879, a significant portion of the planet has been transformed from experiencing a natural pattern of light and dark determined by the sun, moon, stars and occasional other transient lights to being subjected to intermittent and perpetual illumination from human civilisation that is unprecedented in...
Technical Report
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This report documents the production of a map of vegetation types that covers the entire territory of the Baldwin Hills Conservancy using a standard methodology that incorporates high-resolution aerial photography over the entire territory.
Conference Paper
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Urban forests are well recognized as providing numerous benefits to residents, but recent studies from around the United States have shown a decline in urban forest cover. Based on research from Los Angeles and the literature, I identify some obstacles to protecting the urban forest. Researchers have found that tree protection, especially on privat...
Technical Report
Full-text available
The impacts of light pollution and its fluctuations at landscape scales are a concern of public land managers. More information on the distribution, intensity, and dynamics of light pollution in national parks will help improve management decisions. We examined the nature and extent of nighttime light on National Park Service protected areas using...
Conference Paper
Full-text available
This paper presents examples of the latest imaging data of the Earth at night from multiple CubeSat platforms. Beginning in 2012, with AeroCube-4, The Aerospace Corporation has launched multiple CubeSat platforms in different orbits equipped with a common suite of CMOS sensors. Originally designed as utility cameras to assist with attitude control...
Article
Invasions of non-native earthworms into previously earthworm-free regions are a major conservation concern because they alter ecosystems and threaten biological diversity. Little information is available, however, about effects of earthworm invasions outside of temperate and boreal forests, particularly about invasions of islands. For San Clemente...
Chapter
Full-text available
This chapter describes the integration of GIS in a senior practicum in environmen- tal science at UCLA. The author provides a model of how a “flipped classroom” approach can be deployed to provide a fast-paced introduction to spatial analy- sis directed at real-world projects requested by off-campus clients. Although this approach involves an inten...
Technical Report
Full-text available
Artificial night lighting represents a growing challenge for managers of parks and protected lands. The disruption of natural patterns of light and dark, which have been more or less reliable for millions of years, has a range of adverse consequences for wildlife across taxonomic groups and landscape types. This document reviews effects of artifici...
Article
A mounting body of research suggests that invasive non-native earthworms substantially alter microbial communities, including arbuscular mycorrhizal fungi (AMF). These changes to AMF can cascade to affect plant communities and vertebrate populations. Despite these research advances, relatively little is known about: (1) the mechanisms behind earthw...
Article
A mounting body of research suggests that invasive nonnative earthworms substantially alter microbial communities, including arbuscular mycorrhizal fungi (AMF). These changes to AMF can cascade to affect plant communities and vertebrate populations. Despite these research advances, relatively little is known about (1) the mechanisms behind earthwor...
Article
Green buildings should respect nature and endeavor to mitigate harmful effects to the environment and occupants. This is often interpreted as creating sustainable sites, consuming less energy and water, reusing materials, and providing excellent indoor environmental quality. Environmentally friendly buildings should also consider literally the impa...
Technical Report
Full-text available
The federally endangered Lange’s metalmark butterfly underwent a substantial population decline at its sole habitat at the Antioch Dunes National Wildlife Refuge (ADNWR) leading up to starting a captive breeding program for the species in 2007. Despite some success and release of captive-bred butterflies back to the wild, the population has not yet...
Conference Paper
Full-text available
Los Angeles lies at the precipice of a long-awaited, devastating earthquake, yet much of its building stock remains uninvestigated for the structural integrity to endure such forces. An obstacle standing between the city and preparation is that building owners simultaneously overestimate the stability of their structures and underestimate the stren...
Conference Paper
Background/Question/Methods Identifying the spatial distribution, abiotic and biotic associations, and ecological effects of newly introduced species is an important first step to developing management and control measures. Non-native earthworms, including species from Europe and Asia, have invaded much of the northeastern and Great Lakes deciduous...
Chapter
Full-text available
Many of the well-known and intuitive practices from conservation of large mammals do not apply to butterflies. The different body size, lifespan, reproductive potential, and habitat associations of butterflies produce a different series of guidelines for conservation that may conflict with commonly held attitudes and approaches from conservation of...
Article
Full-text available
Human activities have caused a near-ubiquitous and evolutionarily-unprecedented increase in environmental sound levels and artificial night lighting. These stimuli reorganize communities by interfering with species- specific perception of time-cues, habitat features, and auditory and visual signals. Rapid evolutionary changes could occur in respons...
Article
Full-text available
Artificial lighting allows humans to be active at night, but has many unintended consequences, including interference with ecological processes, disruption of circadian rhythms and increased exposure to insect vectors of diseases. Although ultraviolet and blue light are usually most attractive to arthropods, degree of attraction varies among orders...
Article
Full-text available
Birds migrating to and from breeding grounds in the United States and Canada are killed by the millions in collisions with lighted towers and their guy wires. Avian mortality at towers is highly variable across species, and the importance to each population depends on its size and trajectory. Building on our previous estimate of avian mortality at...