Big trees drive forest structure patterns across a lowland Amazon regrowth gradient

Abstract Degraded Amazonian forests can take decades to recover and the ecological results of natural regeneration are still uncertain. Here we use field data collected across 15 lowland Amazon smallholder properties to examine the relationships between forest structure, mammal diversity, regrowth t...

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Autores principales:	Tassiana Maylla Fontoura Caron, Victor Juan Ulises Rodriguez Chuma, Alexander Arévalo Sandi, Darren Norris
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/77058405894a488c87af206a438f1c99
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spelling	oai:doaj.org-article:77058405894a488c87af206a438f1c992021-12-02T14:26:47ZBig trees drive forest structure patterns across a lowland Amazon regrowth gradient10.1038/s41598-021-83030-52045-2322https://doaj.org/article/77058405894a488c87af206a438f1c992021-02-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-83030-5https://doaj.org/toc/2045-2322Abstract Degraded Amazonian forests can take decades to recover and the ecological results of natural regeneration are still uncertain. Here we use field data collected across 15 lowland Amazon smallholder properties to examine the relationships between forest structure, mammal diversity, regrowth type, regrowth age, topography and hydrology. Forest structure was quantified together with mammal diversity in 30 paired regrowth-control plots. Forest regrowth stage was classified into three groups: late second-regrowth, early second-regrowth and abandoned pasture. Basal area in regrowth plots remained less than half that recorded in control plots even after 20–25 years. Although basal area did increase in sequence from pasture, early to late-regrowth plots, there was a significant decline in basal area of late-regrowth control plots associated with a decline in the proportion of large trees. Variation in different forest structure responses was explained by contrasting variables, with the proportion of small trees (DBH < 20 cm) most strongly explained by topography (altitude and slope) whereas the proportion of large trees (DBH > 60 cm) was explained by plot type (control vs. regrowth) and regrowth class. These findings support calls for increased efforts to actively conserve large trees to avoid retrogressive succession around edges of degraded Amazon forests.Tassiana Maylla Fontoura CaronVictor Juan Ulises Rodriguez ChumaAlexander Arévalo SandiDarren NorrisNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-12 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Tassiana Maylla Fontoura Caron Victor Juan Ulises Rodriguez Chuma Alexander Arévalo Sandi Darren Norris Big trees drive forest structure patterns across a lowland Amazon regrowth gradient
description	Abstract Degraded Amazonian forests can take decades to recover and the ecological results of natural regeneration are still uncertain. Here we use field data collected across 15 lowland Amazon smallholder properties to examine the relationships between forest structure, mammal diversity, regrowth type, regrowth age, topography and hydrology. Forest structure was quantified together with mammal diversity in 30 paired regrowth-control plots. Forest regrowth stage was classified into three groups: late second-regrowth, early second-regrowth and abandoned pasture. Basal area in regrowth plots remained less than half that recorded in control plots even after 20–25 years. Although basal area did increase in sequence from pasture, early to late-regrowth plots, there was a significant decline in basal area of late-regrowth control plots associated with a decline in the proportion of large trees. Variation in different forest structure responses was explained by contrasting variables, with the proportion of small trees (DBH < 20 cm) most strongly explained by topography (altitude and slope) whereas the proportion of large trees (DBH > 60 cm) was explained by plot type (control vs. regrowth) and regrowth class. These findings support calls for increased efforts to actively conserve large trees to avoid retrogressive succession around edges of degraded Amazon forests.
format	article
author	Tassiana Maylla Fontoura Caron Victor Juan Ulises Rodriguez Chuma Alexander Arévalo Sandi Darren Norris
author_facet	Tassiana Maylla Fontoura Caron Victor Juan Ulises Rodriguez Chuma Alexander Arévalo Sandi Darren Norris
author_sort	Tassiana Maylla Fontoura Caron
title	Big trees drive forest structure patterns across a lowland Amazon regrowth gradient
title_short	Big trees drive forest structure patterns across a lowland Amazon regrowth gradient
title_full	Big trees drive forest structure patterns across a lowland Amazon regrowth gradient
title_fullStr	Big trees drive forest structure patterns across a lowland Amazon regrowth gradient
title_full_unstemmed	Big trees drive forest structure patterns across a lowland Amazon regrowth gradient
title_sort	big trees drive forest structure patterns across a lowland amazon regrowth gradient
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/77058405894a488c87af206a438f1c99
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Big trees drive forest structure patterns across a lowland Amazon regrowth gradient

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