Sampling bias exaggerates a textbook example of a trophic cascade ...
Understanding trophic cascades in terrestrial wildlife communities is a major challenge because these systems are difficult to sample properly. We show how a tradition of nonrandom sampling has confounded this understanding in a textbook system (Yellowstone National Park) where carnivore [Canis lupu...
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ftdatacite:10.5281/zenodo.10106075 2023-12-31T10:05:45+01:00 Sampling bias exaggerates a textbook example of a trophic cascade ... Brice, Elaine Larsen, Eric MacNulty, Daniel 2023 https://dx.doi.org/10.5281/zenodo.10106075 https://zenodo.org/doi/10.5281/zenodo.10106075 unknown Zenodo https://dx.doi.org/10.1101/2020.05.05.079459 https://dx.doi.org/10.1111/ele.13915 https://dx.doi.org/10.5061/dryad.2z34tmpnj https://dx.doi.org/10.5281/zenodo.5637262 MIT License https://opensource.org/licenses/MIT mit Aspen Populus tremuloides elk Cervus canadensis wolf Canis lupus carnivore predator indirect effects nonrandom sampling sampling bias preferred browsing height Ungulate SoftwareSourceCode Software article 2023 ftdatacite https://doi.org/10.5281/zenodo.1010607510.1101/2020.05.05.07945910.1111/ele.1391510.5061/dryad.2z34tmpnj10.5281/zenodo.5637262 2023-12-01T11:22:45Z Understanding trophic cascades in terrestrial wildlife communities is a major challenge because these systems are difficult to sample properly. We show how a tradition of nonrandom sampling has confounded this understanding in a textbook system (Yellowstone National Park) where carnivore [Canis lupus (wolf)] recovery is associated with a trophic cascade involving changes in herbivore [Cervus canadensis (elk)] behavior and density that promote plant regeneration. Long-term data indicate a practice of sampling only the tallest young plants overestimated regeneration of overstory aspen (Populus tremuloides) by a factor of 3-8 compared to random sampling because it 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 nonrandom sampling described. Our findings highlight the critical importance of basic sampling principles (e.g., randomization) for achieving an accurate ... : This dataset has 18,792 records, including 18,623 records of individual young aspen (plants > 1 year-old & < 600 cm) and 169 records of plots with no young aspen ("zero plots"). Records of individual young aspen (N = 18,623) were used in the majority of analyses (Fig. 2-5a,b), including generalized linear mixed models (GLMMs) that tested how the effect of year on browsing, height, and recruitment of stems differed by sampling method. This dataset was also used to model the effect of stem height on browsing to estimate the preferred browse height (PBH) and browse escape height (BEH). The full dataset that includes plots with no young aspen was only used to calculate the percentage of plots and stands each year with median heights greater than 200 (Fig. 5c) or 300 cm (Fig. 5d). The dataframe has the following 6 columns: Plot: individual identifier for each of 113 plots distributed randomly across the study area. Each plot was a 1 × 20 m belt transect located randomly within an aspen stand Year: year ... Software Canis lupus DataCite Metadata Store (German National Library of Science and Technology) |
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DataCite Metadata Store (German National Library of Science and Technology) |
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Aspen Populus tremuloides elk Cervus canadensis wolf Canis lupus carnivore predator indirect effects nonrandom sampling sampling bias preferred browsing height Ungulate |
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Aspen Populus tremuloides elk Cervus canadensis wolf Canis lupus carnivore predator indirect effects nonrandom sampling sampling bias preferred browsing height Ungulate Brice, Elaine Larsen, Eric MacNulty, Daniel Sampling bias exaggerates a textbook example of a trophic cascade ... |
topic_facet |
Aspen Populus tremuloides elk Cervus canadensis wolf Canis lupus carnivore predator indirect effects nonrandom sampling sampling bias preferred browsing height Ungulate |
description |
Understanding trophic cascades in terrestrial wildlife communities is a major challenge because these systems are difficult to sample properly. We show how a tradition of nonrandom sampling has confounded this understanding in a textbook system (Yellowstone National Park) where carnivore [Canis lupus (wolf)] recovery is associated with a trophic cascade involving changes in herbivore [Cervus canadensis (elk)] behavior and density that promote plant regeneration. Long-term data indicate a practice of sampling only the tallest young plants overestimated regeneration of overstory aspen (Populus tremuloides) by a factor of 3-8 compared to random sampling because it 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 nonrandom sampling described. Our findings highlight the critical importance of basic sampling principles (e.g., randomization) for achieving an accurate ... : This dataset has 18,792 records, including 18,623 records of individual young aspen (plants > 1 year-old & < 600 cm) and 169 records of plots with no young aspen ("zero plots"). Records of individual young aspen (N = 18,623) were used in the majority of analyses (Fig. 2-5a,b), including generalized linear mixed models (GLMMs) that tested how the effect of year on browsing, height, and recruitment of stems differed by sampling method. This dataset was also used to model the effect of stem height on browsing to estimate the preferred browse height (PBH) and browse escape height (BEH). The full dataset that includes plots with no young aspen was only used to calculate the percentage of plots and stands each year with median heights greater than 200 (Fig. 5c) or 300 cm (Fig. 5d). The dataframe has the following 6 columns: Plot: individual identifier for each of 113 plots distributed randomly across the study area. Each plot was a 1 × 20 m belt transect located randomly within an aspen stand Year: year ... |
format |
Software |
author |
Brice, Elaine Larsen, Eric MacNulty, Daniel |
author_facet |
Brice, Elaine Larsen, Eric MacNulty, Daniel |
author_sort |
Brice, Elaine |
title |
Sampling bias exaggerates a textbook example of a trophic cascade ... |
title_short |
Sampling bias exaggerates a textbook example of a trophic cascade ... |
title_full |
Sampling bias exaggerates a textbook example of a trophic cascade ... |
title_fullStr |
Sampling bias exaggerates a textbook example of a trophic cascade ... |
title_full_unstemmed |
Sampling bias exaggerates a textbook example of a trophic cascade ... |
title_sort |
sampling bias exaggerates a textbook example of a trophic cascade ... |
publisher |
Zenodo |
publishDate |
2023 |
url |
https://dx.doi.org/10.5281/zenodo.10106075 https://zenodo.org/doi/10.5281/zenodo.10106075 |
genre |
Canis lupus |
genre_facet |
Canis lupus |
op_relation |
https://dx.doi.org/10.1101/2020.05.05.079459 https://dx.doi.org/10.1111/ele.13915 https://dx.doi.org/10.5061/dryad.2z34tmpnj https://dx.doi.org/10.5281/zenodo.5637262 |
op_rights |
MIT License https://opensource.org/licenses/MIT mit |
op_doi |
https://doi.org/10.5281/zenodo.1010607510.1101/2020.05.05.07945910.1111/ele.1391510.5061/dryad.2z34tmpnj10.5281/zenodo.5637262 |
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