Temporal changes in abundance–occupancy relationships over 40 years

Abstract 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...

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Autores principales:	Lisa L. Manne, Richard R. Veit
Formato:	article
Lenguaje:	EN
Publicado:	Wiley 2020
Materias:	abundance–occupancy avian ecology breeding bird survey geographic range macroecology migratory guild Ecology QH540-549.5
Acceso en línea:	https://doaj.org/article/9c353074044f4eefb725c15f8f4eb724
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spelling	oai:doaj.org-article:9c353074044f4eefb725c15f8f4eb7242021-11-04T13:06:09ZTemporal changes in abundance–occupancy relationships over 40 years2045-775810.1002/ece3.5505https://doaj.org/article/9c353074044f4eefb725c15f8f4eb7242020-01-01T00:00:00Zhttps://doi.org/10.1002/ece3.5505https://doaj.org/toc/2045-7758Abstract 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. 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. 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. 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. 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.Lisa L. ManneRichard R. VeitWileyarticleabundance–occupancyavian ecologybreeding bird surveygeographic rangemacroecologymigratory guildEcologyQH540-549.5ENEcology and Evolution, Vol 10, Iss 2, Pp 602-611 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	abundance–occupancy avian ecology breeding bird survey geographic range macroecology migratory guild Ecology QH540-549.5
spellingShingle	abundance–occupancy avian ecology breeding bird survey geographic range macroecology migratory guild Ecology QH540-549.5 Lisa L. Manne Richard R. Veit Temporal changes in abundance–occupancy relationships over 40 years
description	Abstract 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. 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. 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. 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. 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.
format	article
author	Lisa L. Manne Richard R. Veit
author_facet	Lisa L. Manne Richard R. Veit
author_sort	Lisa L. Manne
title	Temporal changes in abundance–occupancy relationships over 40 years
title_short	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_sort	temporal changes in abundance–occupancy relationships over 40 years
publisher	Wiley
publishDate	2020
url	https://doaj.org/article/9c353074044f4eefb725c15f8f4eb724
work_keys_str_mv	AT lisalmanne temporalchangesinabundanceoccupancyrelationshipsover40years AT richardrveit temporalchangesinabundanceoccupancyrelationshipsover40years
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Temporal changes in abundance–occupancy relationships over 40 years

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