David Inouye - Academia.edu (original) (raw)

Papers by David Inouye

Research paper thumbnail of Winters are changing: snow effects on Arctic and alpine tundra ecosystems

Arctic Science, 2022

Snow is an important driver of ecosystem processes in cold biomes. Snow accumulation determines g... more Snow is an important driver of ecosystem processes in cold biomes. Snow accumulation determines ground temperature, light conditions, and moisture availability during winter. It also affects the growing season’s start and end, and plant access to moisture and nutrients. Here, we review the current knowledge of the snow cover’s role for vegetation, plant-animal interactions, permafrost conditions, microbial processes, and biogeochemical cycling. We also compare studies of natural snow gradients with snow experimental manipulation studies to assess time scale difference of these approaches. The number of tundra snow studies has increased considerably in recent years, yet we still lack a comprehensive overview of how altered snow conditions will affect these ecosystems. Specifically, we found a mismatch in the timing of snowmelt when comparing studies of natural snow gradients with snow manipulations. We found that snowmelt timing achieved by snow addition and snow removal manipulation...

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Research paper thumbnail of Author response for "Bee phenology is predicted by climatic variation and functional traits

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Research paper thumbnail of Towards a U.S. national program for monitoring native bees

Biological Conservation, 2020

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Research paper thumbnail of The effect of demographic correlations on the stochastic population dynamics of perennial plants

Ecological Monographs, 2016

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Research paper thumbnail of Effects of climate change on phenologies and distributions of bumble bees and the plants they visit

Ecosphere, 2016

Surveys of bumble bees and the plants they visit, carried out in 1974 near the Rocky Mountain Bio... more Surveys of bumble bees and the plants they visit, carried out in 1974 near the Rocky Mountain Biological Laboratory in Colorado, were repeated in 2007, thus permitting the testing of hypotheses arising from observed climate change over the intervening 33‐yr period. As expected, given an increase in average air temperature with climate warming and a declining temperature with increasing elevation, there have been significant shifts toward higher elevation for queens or workers or both, for most bumble bee species, for bumble bee queens when species are combined, and for two focal plant species, with no significant downward shifts. However, contrary to our hypotheses, we failed to observe significant altitudinal changes for some bumble bee species and most plant species, and observed changes in elevation were often less than the upward shift of 317 m required to maintain average temperature. As expected, community flowering phenology shifted toward earlier in the season throughout our...

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Research paper thumbnail of Wild hummingbirds discriminate nonspectral colors

Proceedings of the National Academy of Sciences, 2020

Many animals have the potential to discriminate nonspectral colors. For humans, purple is the cle... more Many animals have the potential to discriminate nonspectral colors. For humans, purple is the clearest example of a nonspectral color. It is perceived when two color cone types in the retina (blue and red) with nonadjacent spectral sensitivity curves are predominantly stimulated. Purple is considered nonspectral because no monochromatic light (such as from a rainbow) can evoke this simultaneous stimulation. Except in primates and bees, few behavioral experiments have directly examined nonspectral color discrimination, and little is known about nonspectral color perception in animals with more than three types of color photoreceptors. Birds have four color cone types (compared to three in humans) and might perceive additional nonspectral colors such as UV+red and UV+green. Can birds discriminate nonspectral colors, and are these colors behaviorally and ecologically relevant? Here, using comprehensive behavioral experiments, we show that wild hummingbirds can discriminate a variety of...

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Research paper thumbnail of Parasites, parasitoids, and hive products that are potentially deleterious to wild and commercially raised bumble bees (Bombus spp.) in North America

Journal of Pollination Ecology

Bumble bees are important pollinators for a great diversity of wild and cultivated plants, and in... more Bumble bees are important pollinators for a great diversity of wild and cultivated plants, and in many parts of the world certain species have been found to be in decline, gone locally extinct, or even globally extinct. A large number of symbionts live on, in, or with these social bees. We give an overview of what is known about bumble bee ecto-symbionts and parasitoids. We provide information on assessment of risks posed by select bumble bee symbionts and methods for their detection, quantification, and control. In addition, we assess honey bee hive products such as pollen and wax that are used in commercial bumble bee production, and highlight key risks and knowledge gaps. Knowledge of these potential threats to native pollinators is important and they need to be managed in the context of national and international commercial trade in bumble bees to prevent pest introduction and pathogen spillover that can threaten native bees.

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Research paper thumbnail of Data from: Phenological responses to multiple environmental drivers under climate change: insights from a long-term observational study and a manipulative field experiment

• Climate change has induced pronounced shifts in the reproductive phenology of plants, yet we kn... more • Climate change has induced pronounced shifts in the reproductive phenology of plants, yet we know little about which environmental factors contribute to interspecific variation in responses and their effects on fitness. • We integrate data from a 43-year record of first flowering for six species in subalpine Colorado meadows with a 3-year snow manipulation experiment on the perennial forb Boechera stricta (Brassicaceae) from the same site. We analyze shifts in the onset of flowering in relation to environmental drivers known to influence phenology: the timing of snowmelt, the accumulation of growing degree days, and photoperiod.• Variation in responses to climate change depended on the sequence in which species flowered, with early-flowering species reproducing faster, at a lower heat sum, and under increasingly disparate photoperiods relative to later-flowering species. Early snow removal treatments confirm that the timing of snowmelt governs observed trends in flowering phenology of B. stricta and that climate change can reduce the probability of flowering, thereby depressing fitness. • Our findings suggest that climate change is decoupling historical combinations of photoperiod and temperature and outpacing phenological changes for our focal species. Accurate predictions of biological responses to climate change require a thorough understanding of the factors driving shifts in phenology

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Research paper thumbnail of An evidence-based rationale for a North American commercial bumble bee clean stock certification program

Journal of Pollination Ecology

The commercial production and subsequent movement of bumble bees for pollination of agricultural ... more The commercial production and subsequent movement of bumble bees for pollination of agricultural field and greenhouse crops is a growing industry in North America and globally. Concerns have been raised about the impacts of pathogen spillover from managed bees to wild pollinators, including from commercial bumble bees. We recommend development of a program to mitigate disease risk in commercial bumble bee production, which will in turn reduce disease stressors on wild pollinators and other insects. We provide recommendations for the components of a clean stock program with specific best management practices for rearing commercial bumble bees including related products such as wax, pollen, and nesting material.

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Research paper thumbnail of Climate change and phenology

WIREs Climate Change, 2022

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Research paper thumbnail of Appendix A. Species list and flowering time data used in analyses

Species list and flowering time data used in analyses.

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Research paper thumbnail of Snowmelt dates 1978-2014

Long-term snowmelt data (1978-2014) collected at one mid-elevation location near the Rocky Mounta... more Long-term snowmelt data (1978-2014) collected at one mid-elevation location near the Rocky Mountain Biological Laboratory by billy barr. See README.txt for column descriptions

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Research paper thumbnail of IPBES: global collaboration on biodiversity and ecosystem services

Frontiers in Ecology and the Environment, 2014

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Research paper thumbnail of The effect of spatio-temporal heterogeneity on the dynamics of plant populations

Background/Question/Methods Spatio-temporal variation in demographic rates is still an area of co... more Background/Question/Methods Spatio-temporal variation in demographic rates is still an area of considerable theoretical and empirical interest in population ecology. Variation in demographic rates affects fitness, and it therefore has implications for population dynamics and evolution. In general, demographic rate variation is expected to decrease long term population growth, but this need not always apply. For example, such variation might have no effect if demographic rates covary negatively among each other. We used long term plant demographic data from three perennial plant species to estimate the variation and covariation of vital rates across space and time. To estimate demographic rate covariation and to quantify parameter uncertainty, we fit models in a hierarchical Bayesian framework. We used parameter estimates to build stochastic Integral Projection Models (IPMs) for each species, which we used to address three questions: 1) What is the effect of interannual and spatial v...

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Research paper thumbnail of Species-specific shifts in flowering phenology influence community-level patterns: implications for plant-pollinator interactions

Background/Question/Methods With unprecedented rates of temperature increases and altered precipi... more Background/Question/Methods With unprecedented rates of temperature increases and altered precipitation regimes across the globe, species are showing strong directional shifts in the timing of their life history events in accordance with these changes in their abiotic environment. Although the overall trend is for earlier phenological events, the phenological shifts of individual species can differ substantially in both magnitude and direction. Given the variation and complexity of phenological responses across species, the emergent community-level response is unlikely to shift in a simple uniform pattern through time. To explore how phenological shifts of individual species scale up to influence community-level patterns of phenology, we analyze data from a long-term, ongoing study of flowering time for 60 species at a site in the Colorado Rocky Mountains over the last 39 years (1974-2012). Furthermore, to investigate how changes in the flowering community might influence interactio...

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Research paper thumbnail of Historical Records Committee

Bulletin of the Ecological Society of America, 2008

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Research paper thumbnail of Endosymbionts that threaten commercially raised and wild bumble bees (Bombus spp.)

Journal of Pollination Ecology

Bumble bees (Bombus spp.) are important pollinators for both wild and agriculturally managed plan... more Bumble bees (Bombus spp.) are important pollinators for both wild and agriculturally managed plants. We give an overview of what is known about the diverse community of internal potentially deleterious bumble bee symbionts, including viruses, bacteria, protozoans, fungi, and nematodes, as well as methods for their detection, quantification, and control. We also provide information on assessment of risk for select bumble bee symbionts and highlight key knowledge gaps. This information is crucial for ongoing efforts to establish parasite-free programs for future commerce in bumble bees for crop pollination, and to mitigate the problems with pathogen spillover to wild populations.

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Research paper thumbnail of Reports by Boards and ESA Representatives to Other Organizations

The Bulletin of the Ecological Society of America

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Research paper thumbnail of Data from: Interannual bumble bee abundance is driven by indirect climate effects on floral resource phenology

This is an archive of the data used in the publication: Ogilvie JE, Griffin SR, Gezon ZJ, Inouye ... more This is an archive of the data used in the publication: Ogilvie JE, Griffin SR, Gezon ZJ, Inouye BD, Underwood N, Inouye DW, Irwin RE. 2017. Interannual bumble bee abundance is driven by indirect climate effects on floral resource phenology. Ecology Letters, doi: 10.1111/ele.12854<br>DATA DESCRIPTION<br><br><b>Bombus_floral_climate_data_for_SEMs.csv</b><br><b><br></b>This file has the 2009-2016 data used in the structural equation models. <i><b>peak.bee.count</b></i> is the annual peak number of bumble bees netted from flowers on a sampling day. <i><b>sampling.time.hr</b></i> is the amount of time in hours that a site was sampled on the peak abundance sampling day. <i><b>floral.sum</b></i> is the sum of flowers from first flower accumulated to 80% of the season's total flower count. <b><i>number.floral.days</i></b> is the number of...

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Research paper thumbnail of Valeriana edulis spatial dispersion plot

This .zip archive contains a shapefile (including .shp, .shx, .dbf, and .prj components) that des... more This .zip archive contains a shapefile (including .shp, .shx, .dbf, and .prj components) that describes the boundary of a representative plot of Valeriana edulis plants growing at Emerald Lake

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Research paper thumbnail of Winters are changing: snow effects on Arctic and alpine tundra ecosystems

Arctic Science, 2022

Snow is an important driver of ecosystem processes in cold biomes. Snow accumulation determines g... more Snow is an important driver of ecosystem processes in cold biomes. Snow accumulation determines ground temperature, light conditions, and moisture availability during winter. It also affects the growing season’s start and end, and plant access to moisture and nutrients. Here, we review the current knowledge of the snow cover’s role for vegetation, plant-animal interactions, permafrost conditions, microbial processes, and biogeochemical cycling. We also compare studies of natural snow gradients with snow experimental manipulation studies to assess time scale difference of these approaches. The number of tundra snow studies has increased considerably in recent years, yet we still lack a comprehensive overview of how altered snow conditions will affect these ecosystems. Specifically, we found a mismatch in the timing of snowmelt when comparing studies of natural snow gradients with snow manipulations. We found that snowmelt timing achieved by snow addition and snow removal manipulation...

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Research paper thumbnail of Author response for "Bee phenology is predicted by climatic variation and functional traits

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Towards a U.S. national program for monitoring native bees

Biological Conservation, 2020

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Research paper thumbnail of The effect of demographic correlations on the stochastic population dynamics of perennial plants

Ecological Monographs, 2016

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Effects of climate change on phenologies and distributions of bumble bees and the plants they visit

Ecosphere, 2016

Surveys of bumble bees and the plants they visit, carried out in 1974 near the Rocky Mountain Bio... more Surveys of bumble bees and the plants they visit, carried out in 1974 near the Rocky Mountain Biological Laboratory in Colorado, were repeated in 2007, thus permitting the testing of hypotheses arising from observed climate change over the intervening 33‐yr period. As expected, given an increase in average air temperature with climate warming and a declining temperature with increasing elevation, there have been significant shifts toward higher elevation for queens or workers or both, for most bumble bee species, for bumble bee queens when species are combined, and for two focal plant species, with no significant downward shifts. However, contrary to our hypotheses, we failed to observe significant altitudinal changes for some bumble bee species and most plant species, and observed changes in elevation were often less than the upward shift of 317 m required to maintain average temperature. As expected, community flowering phenology shifted toward earlier in the season throughout our...

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Research paper thumbnail of Wild hummingbirds discriminate nonspectral colors

Proceedings of the National Academy of Sciences, 2020

Many animals have the potential to discriminate nonspectral colors. For humans, purple is the cle... more Many animals have the potential to discriminate nonspectral colors. For humans, purple is the clearest example of a nonspectral color. It is perceived when two color cone types in the retina (blue and red) with nonadjacent spectral sensitivity curves are predominantly stimulated. Purple is considered nonspectral because no monochromatic light (such as from a rainbow) can evoke this simultaneous stimulation. Except in primates and bees, few behavioral experiments have directly examined nonspectral color discrimination, and little is known about nonspectral color perception in animals with more than three types of color photoreceptors. Birds have four color cone types (compared to three in humans) and might perceive additional nonspectral colors such as UV+red and UV+green. Can birds discriminate nonspectral colors, and are these colors behaviorally and ecologically relevant? Here, using comprehensive behavioral experiments, we show that wild hummingbirds can discriminate a variety of...

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Research paper thumbnail of Parasites, parasitoids, and hive products that are potentially deleterious to wild and commercially raised bumble bees (Bombus spp.) in North America

Journal of Pollination Ecology

Bumble bees are important pollinators for a great diversity of wild and cultivated plants, and in... more Bumble bees are important pollinators for a great diversity of wild and cultivated plants, and in many parts of the world certain species have been found to be in decline, gone locally extinct, or even globally extinct. A large number of symbionts live on, in, or with these social bees. We give an overview of what is known about bumble bee ecto-symbionts and parasitoids. We provide information on assessment of risks posed by select bumble bee symbionts and methods for their detection, quantification, and control. In addition, we assess honey bee hive products such as pollen and wax that are used in commercial bumble bee production, and highlight key risks and knowledge gaps. Knowledge of these potential threats to native pollinators is important and they need to be managed in the context of national and international commercial trade in bumble bees to prevent pest introduction and pathogen spillover that can threaten native bees.

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Research paper thumbnail of Data from: Phenological responses to multiple environmental drivers under climate change: insights from a long-term observational study and a manipulative field experiment

• Climate change has induced pronounced shifts in the reproductive phenology of plants, yet we kn... more • Climate change has induced pronounced shifts in the reproductive phenology of plants, yet we know little about which environmental factors contribute to interspecific variation in responses and their effects on fitness. • We integrate data from a 43-year record of first flowering for six species in subalpine Colorado meadows with a 3-year snow manipulation experiment on the perennial forb Boechera stricta (Brassicaceae) from the same site. We analyze shifts in the onset of flowering in relation to environmental drivers known to influence phenology: the timing of snowmelt, the accumulation of growing degree days, and photoperiod.• Variation in responses to climate change depended on the sequence in which species flowered, with early-flowering species reproducing faster, at a lower heat sum, and under increasingly disparate photoperiods relative to later-flowering species. Early snow removal treatments confirm that the timing of snowmelt governs observed trends in flowering phenology of B. stricta and that climate change can reduce the probability of flowering, thereby depressing fitness. • Our findings suggest that climate change is decoupling historical combinations of photoperiod and temperature and outpacing phenological changes for our focal species. Accurate predictions of biological responses to climate change require a thorough understanding of the factors driving shifts in phenology

Bookmarks Related papers MentionsView impact

Research paper thumbnail of An evidence-based rationale for a North American commercial bumble bee clean stock certification program

Journal of Pollination Ecology

The commercial production and subsequent movement of bumble bees for pollination of agricultural ... more The commercial production and subsequent movement of bumble bees for pollination of agricultural field and greenhouse crops is a growing industry in North America and globally. Concerns have been raised about the impacts of pathogen spillover from managed bees to wild pollinators, including from commercial bumble bees. We recommend development of a program to mitigate disease risk in commercial bumble bee production, which will in turn reduce disease stressors on wild pollinators and other insects. We provide recommendations for the components of a clean stock program with specific best management practices for rearing commercial bumble bees including related products such as wax, pollen, and nesting material.

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Research paper thumbnail of Climate change and phenology

WIREs Climate Change, 2022

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Research paper thumbnail of Appendix A. Species list and flowering time data used in analyses

Species list and flowering time data used in analyses.

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Research paper thumbnail of Snowmelt dates 1978-2014

Long-term snowmelt data (1978-2014) collected at one mid-elevation location near the Rocky Mounta... more Long-term snowmelt data (1978-2014) collected at one mid-elevation location near the Rocky Mountain Biological Laboratory by billy barr. See README.txt for column descriptions

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Research paper thumbnail of IPBES: global collaboration on biodiversity and ecosystem services

Frontiers in Ecology and the Environment, 2014

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Research paper thumbnail of The effect of spatio-temporal heterogeneity on the dynamics of plant populations

Background/Question/Methods Spatio-temporal variation in demographic rates is still an area of co... more Background/Question/Methods Spatio-temporal variation in demographic rates is still an area of considerable theoretical and empirical interest in population ecology. Variation in demographic rates affects fitness, and it therefore has implications for population dynamics and evolution. In general, demographic rate variation is expected to decrease long term population growth, but this need not always apply. For example, such variation might have no effect if demographic rates covary negatively among each other. We used long term plant demographic data from three perennial plant species to estimate the variation and covariation of vital rates across space and time. To estimate demographic rate covariation and to quantify parameter uncertainty, we fit models in a hierarchical Bayesian framework. We used parameter estimates to build stochastic Integral Projection Models (IPMs) for each species, which we used to address three questions: 1) What is the effect of interannual and spatial v...

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Research paper thumbnail of Species-specific shifts in flowering phenology influence community-level patterns: implications for plant-pollinator interactions

Background/Question/Methods With unprecedented rates of temperature increases and altered precipi... more Background/Question/Methods With unprecedented rates of temperature increases and altered precipitation regimes across the globe, species are showing strong directional shifts in the timing of their life history events in accordance with these changes in their abiotic environment. Although the overall trend is for earlier phenological events, the phenological shifts of individual species can differ substantially in both magnitude and direction. Given the variation and complexity of phenological responses across species, the emergent community-level response is unlikely to shift in a simple uniform pattern through time. To explore how phenological shifts of individual species scale up to influence community-level patterns of phenology, we analyze data from a long-term, ongoing study of flowering time for 60 species at a site in the Colorado Rocky Mountains over the last 39 years (1974-2012). Furthermore, to investigate how changes in the flowering community might influence interactio...

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Research paper thumbnail of Historical Records Committee

Bulletin of the Ecological Society of America, 2008

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Research paper thumbnail of Endosymbionts that threaten commercially raised and wild bumble bees (Bombus spp.)

Journal of Pollination Ecology

Bumble bees (Bombus spp.) are important pollinators for both wild and agriculturally managed plan... more Bumble bees (Bombus spp.) are important pollinators for both wild and agriculturally managed plants. We give an overview of what is known about the diverse community of internal potentially deleterious bumble bee symbionts, including viruses, bacteria, protozoans, fungi, and nematodes, as well as methods for their detection, quantification, and control. We also provide information on assessment of risk for select bumble bee symbionts and highlight key knowledge gaps. This information is crucial for ongoing efforts to establish parasite-free programs for future commerce in bumble bees for crop pollination, and to mitigate the problems with pathogen spillover to wild populations.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Reports by Boards and ESA Representatives to Other Organizations

The Bulletin of the Ecological Society of America

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Research paper thumbnail of Data from: Interannual bumble bee abundance is driven by indirect climate effects on floral resource phenology

This is an archive of the data used in the publication: Ogilvie JE, Griffin SR, Gezon ZJ, Inouye ... more This is an archive of the data used in the publication: Ogilvie JE, Griffin SR, Gezon ZJ, Inouye BD, Underwood N, Inouye DW, Irwin RE. 2017. Interannual bumble bee abundance is driven by indirect climate effects on floral resource phenology. Ecology Letters, doi: 10.1111/ele.12854<br>DATA DESCRIPTION<br><br><b>Bombus_floral_climate_data_for_SEMs.csv</b><br><b><br></b>This file has the 2009-2016 data used in the structural equation models. <i><b>peak.bee.count</b></i> is the annual peak number of bumble bees netted from flowers on a sampling day. <i><b>sampling.time.hr</b></i> is the amount of time in hours that a site was sampled on the peak abundance sampling day. <i><b>floral.sum</b></i> is the sum of flowers from first flower accumulated to 80% of the season's total flower count. <b><i>number.floral.days</i></b> is the number of...

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Research paper thumbnail of Valeriana edulis spatial dispersion plot

This .zip archive contains a shapefile (including .shp, .shx, .dbf, and .prj components) that des... more This .zip archive contains a shapefile (including .shp, .shx, .dbf, and .prj components) that describes the boundary of a representative plot of Valeriana edulis plants growing at Emerald Lake

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