Collapse, reorganization, and regime identity: breaking down past management paradigms in a forest-grassland ecotone

The identity of an ecological regime is central to modern resilience theory and our understanding of how systems collapse and reorganize following disturbance. However, resilience-based models used in ecosystem management have been criticized for their failure to integrate disturbance outcomes into...

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Autores principales:	Victoria M. Donovan, Caleb P. Roberts, Carissa L. Wonkka, Daniel R. Uden, David G. Angeler, Craig R. Allen, David A. Wedin, Rhae A. Drijber, Dirac Twidwell
Formato:	article
Lenguaje:	EN
Publicado:	Resilience Alliance 2021
Materias:	alternative state collapse ecological memory ecological legacy ecotone regime identity reorganization resilience state-and-transition model Biology (General) QH301-705.5 Ecology QH540-549.5
Acceso en línea:	https://doaj.org/article/dea84232dcd34b069314bec10d980eb2
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spelling	oai:doaj.org-article:dea84232dcd34b069314bec10d980eb22021-11-15T16:40:18ZCollapse, reorganization, and regime identity: breaking down past management paradigms in a forest-grassland ecotone1708-308710.5751/ES-12340-260227https://doaj.org/article/dea84232dcd34b069314bec10d980eb22021-06-01T00:00:00Zhttps://www.ecologyandsociety.org/vol26/iss2/art27/https://doaj.org/toc/1708-3087The identity of an ecological regime is central to modern resilience theory and our understanding of how systems collapse and reorganize following disturbance. However, resilience-based models used in ecosystem management have been criticized for their failure to integrate disturbance outcomes into regime identity. Assessments are needed to understand how well these classifications represent ecosystem responses that occur over management relevant time scales. We tracked post-wildfire forest and grassland dynamics 27 years after wildfire in eastern ponderosa pine savanna. We tested for differences between the assigned identity of a site (forest or grassland) versus classifications based on the site's disturbance history (burned/unburned and fire severity). Under current ecosystem models used to manage these forest-grassland ecotones, forests that experience high severity fire are expected to resemble an unburned grassland following fire, while forests and grasslands that experience low severity fire are expected to resemble unburned forests and grasslands, respectively. Twenty-seven years after wildfire, burned forests and grasslands displayed a high degree of departure from their expected regime identity. Plant and bird communities deviated significantly on sites that experienced low severity fire from undisturbed sites classified under the same ecological regime (grassland or forest). Forest sites that experienced high severity fire were the most unique of all disturbance history classes. Our results demonstrate that structures and communities predicted under resilience-based models used for eastern ponderosa pine management do not emerge over management relevant time scales following disturbance. Over 20% of variation in ecological structures and communities was explained by a single, 27-year-old disturbance. Integrating disturbance legacies will help improve applied models of ecosystem dynamics.Victoria M. DonovanCaleb P. RobertsCarissa L. WonkkaDaniel R. UdenDavid G. AngelerCraig R. AllenDavid A. WedinRhae A. DrijberDirac TwidwellResilience Alliancearticlealternative statecollapseecological memoryecological legacyecotoneregime identityreorganizationresiliencestate-and-transition modelBiology (General)QH301-705.5EcologyQH540-549.5ENEcology and Society, Vol 26, Iss 2, p 27 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	alternative state collapse ecological memory ecological legacy ecotone regime identity reorganization resilience state-and-transition model Biology (General) QH301-705.5 Ecology QH540-549.5
spellingShingle	alternative state collapse ecological memory ecological legacy ecotone regime identity reorganization resilience state-and-transition model Biology (General) QH301-705.5 Ecology QH540-549.5 Victoria M. Donovan Caleb P. Roberts Carissa L. Wonkka Daniel R. Uden David G. Angeler Craig R. Allen David A. Wedin Rhae A. Drijber Dirac Twidwell Collapse, reorganization, and regime identity: breaking down past management paradigms in a forest-grassland ecotone
description	The identity of an ecological regime is central to modern resilience theory and our understanding of how systems collapse and reorganize following disturbance. However, resilience-based models used in ecosystem management have been criticized for their failure to integrate disturbance outcomes into regime identity. Assessments are needed to understand how well these classifications represent ecosystem responses that occur over management relevant time scales. We tracked post-wildfire forest and grassland dynamics 27 years after wildfire in eastern ponderosa pine savanna. We tested for differences between the assigned identity of a site (forest or grassland) versus classifications based on the site's disturbance history (burned/unburned and fire severity). Under current ecosystem models used to manage these forest-grassland ecotones, forests that experience high severity fire are expected to resemble an unburned grassland following fire, while forests and grasslands that experience low severity fire are expected to resemble unburned forests and grasslands, respectively. Twenty-seven years after wildfire, burned forests and grasslands displayed a high degree of departure from their expected regime identity. Plant and bird communities deviated significantly on sites that experienced low severity fire from undisturbed sites classified under the same ecological regime (grassland or forest). Forest sites that experienced high severity fire were the most unique of all disturbance history classes. Our results demonstrate that structures and communities predicted under resilience-based models used for eastern ponderosa pine management do not emerge over management relevant time scales following disturbance. Over 20% of variation in ecological structures and communities was explained by a single, 27-year-old disturbance. Integrating disturbance legacies will help improve applied models of ecosystem dynamics.
format	article
author	Victoria M. Donovan Caleb P. Roberts Carissa L. Wonkka Daniel R. Uden David G. Angeler Craig R. Allen David A. Wedin Rhae A. Drijber Dirac Twidwell
author_facet	Victoria M. Donovan Caleb P. Roberts Carissa L. Wonkka Daniel R. Uden David G. Angeler Craig R. Allen David A. Wedin Rhae A. Drijber Dirac Twidwell
author_sort	Victoria M. Donovan
title	Collapse, reorganization, and regime identity: breaking down past management paradigms in a forest-grassland ecotone
title_short	Collapse, reorganization, and regime identity: breaking down past management paradigms in a forest-grassland ecotone
title_full	Collapse, reorganization, and regime identity: breaking down past management paradigms in a forest-grassland ecotone
title_fullStr	Collapse, reorganization, and regime identity: breaking down past management paradigms in a forest-grassland ecotone
title_full_unstemmed	Collapse, reorganization, and regime identity: breaking down past management paradigms in a forest-grassland ecotone
title_sort	collapse, reorganization, and regime identity: breaking down past management paradigms in a forest-grassland ecotone
publisher	Resilience Alliance
publishDate	2021
url	https://doaj.org/article/dea84232dcd34b069314bec10d980eb2
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Collapse, reorganization, and regime identity: breaking down past management paradigms in a forest-grassland ecotone

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