Christopher A. Halsch
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View article: Allochronic isolation between sympatric populations of an alpine butterfly
Allochronic isolation between sympatric populations of an alpine butterfly Open
The role of isolation by distance in contributing to population structure across space is well understood, and the same principles should operate over time. Allochrony, the isolation of populations due to separation in time, can be a sourc…
View article: Specialized flower visitation in montane butterflies is associated with positive population trajectories over time
Specialized flower visitation in montane butterflies is associated with positive population trajectories over time Open
Insect biodiversity is under threat from multiple stressors, including climate change and extreme weather. For butterflies, nectar resource use is an understudied trait in relation to population trajectories and responses to global change.…
View article: Shifting Baselines in North America's Longest Running Butterfly Monitoring Program
Shifting Baselines in North America's Longest Running Butterfly Monitoring Program Open
Eroding perceptions of biodiversity present a significant challenge for conservation. If younger generations see current degraded states as “natural,” goals for conservation actions may not be ambitious enough, and public support may be co…
View article: Pesticide Contamination of Two Urban Areas Has Implications for Insect Conservation and Green Space Management
Pesticide Contamination of Two Urban Areas Has Implications for Insect Conservation and Green Space Management Open
View article: Thirty‐six years of butterfly monitoring, snow cover, and plant productivity reveal negative impacts of warmer winters and increased productivity on montane species
Thirty‐six years of butterfly monitoring, snow cover, and plant productivity reveal negative impacts of warmer winters and increased productivity on montane species Open
Climate change is contributing to declines of insects through rising temperatures, altered precipitation patterns, and an increasing frequency of extreme events. The impacts of both gradual and sudden shifts in weather patterns are realize…
View article: Thirty-six years of butterflies, snow, and plant productivity reveal negative impacts of warmer winters and increased productivity on montane species
Thirty-six years of butterflies, snow, and plant productivity reveal negative impacts of warmer winters and increased productivity on montane species Open
This file contains the data and scripts needed to reproduce the results presented in "Thirty-six years of butterflies, snow cover, and plant productivity reveal negative impacts of warmer winters and increased primary productivity on monta…
View article: Additive and interactive effects of anthropogenic stressors on an insect herbivore
Additive and interactive effects of anthropogenic stressors on an insect herbivore Open
The pressures of global change acting on wild plants and animals include exposure to environmental toxins, the introduction of non-native species, and climate change. Relatively few studies have been reported in which these three main clas…
View article: Missing the bigger picture: Why insect monitoring programs are limited in their ability to document the effects of habitat loss
Missing the bigger picture: Why insect monitoring programs are limited in their ability to document the effects of habitat loss Open
The fate of insects in the Anthropocene has been widely discussed in the scientific literature, the popular media, and in policy circles. This recent attention is justified because reductions in insect abundance and diversity have the pote…
View article: Additive and interactive pressures of anthropogenic stressors on an insect herbivore
Additive and interactive pressures of anthropogenic stressors on an insect herbivore Open
This file contains the data and scripts needed to reproduce the results presented in "Additive and interactive pressures of anthropogenic stressors on an insect herbivore."
View article: Additive and interactive pressures of anthropogenic stressors on an insect herbivore
Additive and interactive pressures of anthropogenic stressors on an insect herbivore Open
This file contains the data and scripts needed to reproduce the results presented in "Additive and interactive pressures of anthropogenic stressors on an insect herbivore."
View article: Milkweed plants bought at nurseries may expose monarch caterpillars to harmful pesticide residues
Milkweed plants bought at nurseries may expose monarch caterpillars to harmful pesticide residues Open
The decline of monarch butterflies in both the eastern and western United States has garnered widespread public interest. Planting milkweeds, their larval host plants, has been promoted as one action individuals can take, but little is kno…
View article: Assessing risk for butterflies in the context of climate change, demographic uncertainty, and heterogenous data sources
Assessing risk for butterflies in the context of climate change, demographic uncertainty, and heterogenous data sources Open
Ongoing declines in insect populations have led to substantial concern and calls for conservation action. However, even for relatively well-studied groups, like butterflies, information relevant to species-specific status and risk is scatt…
View article: Milkweed plants bought at nurseries may expose monarch caterpillars to harmful pesticide residues
Milkweed plants bought at nurseries may expose monarch caterpillars to harmful pesticide residues Open
The decline of monarch butterflies in both the eastern and western United States has garnered widespread public interest. Planting milkweeds, their larval host plants, has been promoted as one action individuals can take, but little is kno…
View article: Insects and recent climate change
Insects and recent climate change Open
Insects have diversified through more than 450 million y of Earth’s changeable climate, yet rapidly shifting patterns of temperature and precipitation now pose novel challenges as they combine with decades of other anthropogenic stressors …
View article: Pesticide Contamination of Milkweeds Across the Agricultural, Urban, and Open Spaces of Low-Elevation Northern California
Pesticide Contamination of Milkweeds Across the Agricultural, Urban, and Open Spaces of Low-Elevation Northern California Open
Monarch butterflies (Danaus plexippus) are in decline in the western United States and are encountering a range of anthropogenic stressors. Pesticides are among the factors that likely contribute to this decline, although the concentration…
View article: Insects and recent climate change
Insects and recent climate change Open
Insects have diversified through 400 million years of Earth’s changeable climate, yet recent and ongoing shifts in patterns of temperature and precipitation pose novel challenges as they combine with decades of other anthropogenic stressor…
View article: Pesticide contamination of milkweeds across the agricultural, urban, and open spaces of low elevation Northern California
Pesticide contamination of milkweeds across the agricultural, urban, and open spaces of low elevation Northern California Open
Monarch butterflies ( Danaus plexippus ) are in decline in the western United States and are encountering a range of anthropogenic stressors. Pesticides are among the factors that likely contribute to this decline, though the concentration…
View article: Impacts of competition and herbivory on native plants in a community‐engaged, adaptively managed restoration experiment
Impacts of competition and herbivory on native plants in a community‐engaged, adaptively managed restoration experiment Open
Restoring biodiversity to degraded sites in the wildland–urban interface is challenging due to many factors, including competition with non‐native species and increased herbivore pressure. In a unique collaboration between land managers, e…
View article: A winner in the Anthropocene: changing host plant distribution explains geographic range expansion in the gulf fritillary butterfly
A winner in the Anthropocene: changing host plant distribution explains geographic range expansion in the gulf fritillary butterfly Open
The changing climate is altering the geographic distributions of species around the world with consequences for population dynamics, resulting in winners and losers in the Anthropocene. Agraulis vanillae , the gulf fritillary butterfly, ha…