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Temporal changes in abundance–occupancy relationships over 40 years

1. Abundance–occupancy (A–O) relationships are widely documented for many organismal groups and regions, and have been used to gain an understanding of regional population and community trends. Monitoring changes in abundance and occupancy over time may be what is required to document changes in con...

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Autores principales: Manne, Lisa L., Veit, Richard R.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6988556/
https://www.ncbi.nlm.nih.gov/pubmed/32015829
http://dx.doi.org/10.1002/ece3.5505
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author Manne, Lisa L.
Veit, Richard R.
author_facet Manne, Lisa L.
Veit, Richard R.
author_sort Manne, Lisa L.
collection PubMed
description 1. Abundance–occupancy (A–O) relationships are widely documented for many organismal groups and regions, and have been used to gain an understanding of regional population and community trends. Monitoring changes in abundance and occupancy over time may be what is required to document changes in conservation status and needs for some species, communities, or areas. 2. We hypothesize that if there is a higher proportion of declining species in one group of species compared with another (e.g., migratory species vs. permanent residents), then a consequence of that difference will be vastly different abundance–occupancy relationships. If this difference persists through time, then the resulting A–O relationships between the groups will continue to diverge. 3. For neotropical migrants, short‐distance migrants, and permanent resident birds of North America, we assess the numbers of declining species over 1969–2009. We further test for differences in the A–O relationship across these three groups, and in rates of change in abundance and occupancy separately. 4. We find significant differences in numbers of declining species across the migratory groups, a significant decline in the A–O relationship for permanent residents, a significant increase for Neotropical migrants, and a nonsignificant decline for short‐distance migrants over the 40 years. Further, abundances are not changing at different rates but occupancies are consistently greater over time for neotropical migrants versus permanent residents, likely driving the changes in A–O relationships observed. 5. In these analyses, we documented changing A–O trends for different groups of species, over a relatively long time period for ecological studies, one of only a few studies to examine A–O relationships over time. Further, we have shown that a temporally unvarying abundance–occupancy relationship is not universal, and we posit that variability in A–O relationships is due to human impacts on habitats, coupled with variation in species' abilities to respond to human impacts.
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spelling pubmed-69885562020-02-03 Temporal changes in abundance–occupancy relationships over 40 years Manne, Lisa L. Veit, Richard R. Ecol Evol Original Research 1. Abundance–occupancy (A–O) relationships are widely documented for many organismal groups and regions, and have been used to gain an understanding of regional population and community trends. Monitoring changes in abundance and occupancy over time may be what is required to document changes in conservation status and needs for some species, communities, or areas. 2. We hypothesize that if there is a higher proportion of declining species in one group of species compared with another (e.g., migratory species vs. permanent residents), then a consequence of that difference will be vastly different abundance–occupancy relationships. If this difference persists through time, then the resulting A–O relationships between the groups will continue to diverge. 3. For neotropical migrants, short‐distance migrants, and permanent resident birds of North America, we assess the numbers of declining species over 1969–2009. We further test for differences in the A–O relationship across these three groups, and in rates of change in abundance and occupancy separately. 4. We find significant differences in numbers of declining species across the migratory groups, a significant decline in the A–O relationship for permanent residents, a significant increase for Neotropical migrants, and a nonsignificant decline for short‐distance migrants over the 40 years. Further, abundances are not changing at different rates but occupancies are consistently greater over time for neotropical migrants versus permanent residents, likely driving the changes in A–O relationships observed. 5. In these analyses, we documented changing A–O trends for different groups of species, over a relatively long time period for ecological studies, one of only a few studies to examine A–O relationships over time. Further, we have shown that a temporally unvarying abundance–occupancy relationship is not universal, and we posit that variability in A–O relationships is due to human impacts on habitats, coupled with variation in species' abilities to respond to human impacts. John Wiley and Sons Inc. 2019-09-30 /pmc/articles/PMC6988556/ /pubmed/32015829 http://dx.doi.org/10.1002/ece3.5505 Text en © 2019 The Authors. Ecology and Evolution published by John Wiley & Sons Ltd. This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
spellingShingle Original Research
Manne, Lisa L.
Veit, Richard R.
Temporal changes in abundance–occupancy relationships over 40 years
title Temporal changes in abundance–occupancy relationships over 40 years
title_full Temporal changes in abundance–occupancy relationships over 40 years
title_fullStr Temporal changes in abundance–occupancy relationships over 40 years
title_full_unstemmed Temporal changes in abundance–occupancy relationships over 40 years
title_short Temporal changes in abundance–occupancy relationships over 40 years
title_sort temporal changes in abundance–occupancy relationships over 40 years
topic Original Research
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6988556/
https://www.ncbi.nlm.nih.gov/pubmed/32015829
http://dx.doi.org/10.1002/ece3.5505
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