Vista normal Vista MARC Vista ISBD

Ecosystem resilience and threshold response in the Galapagos coastal zone / Alistair W. R. Seddon ... [et al.].

Por:

Seddon, Alistair W. R [autor]

Colaborador(es):

Tipo de material:

ArtículoIdioma: Inglés Detalles de publicación: 2011.Descripción: : 1-11 pTema(s):

Clasificación CDD:

23 581.7

Recursos en línea:

Haga clic para acceso en línea

En: PLOS ONE Vol. 6, No. 7 (July 2011), p. 1-11.Tema: Background: The Intergovernmental Panel on Climate Change (IPCC) provides a conservative estimate on rates of sea-level rise of 3.8 mm yr 21 at the end of the 21st century, which may have a detrimental effect on ecologically important mangrove ecosystems. Understanding factors influencing the long-term resilience of these communities is critical but poorly understood. We investigate ecological resilience in a coastal mangrove community from the Galapagos Islands over the last 2700 years using three research questions: What are the ‘fast and slow’ processes operating in the coastal zone? Is there evidence for a threshold response? How can the past inform us about the resilience of the modern system? Methodology/Principal Findings: Palaeoecological methods (AMS radiocarbon dating, stable carbon isotopes (dC)) were used to reconstruct sedimentation rates and ecological change over the past 2,700 years at Diablas lagoon, Isabela, Galapagos. Bulk geochemical analysis was also used to determine local environmental changes, and salinity was reconstructed using a diatom transfer function. Changes in relative sea level (RSL) were estimated using a glacio-isostatic adjustment model. Non-linear behaviour was observed in the Diablas mangrove ecosystem as it responded to increased salinities following exposure to tidal inundations. A negative feedback was observed which enabled the mangrove canopy to accrete vertically, but disturbances may have opened up the canopy and contributed to an erosion of resilience over time. A combination of drier climatic conditions and a slight fall in RSL then resulted in a threshold response, from a mangrove community to a microbial mat. Conclusions/Significance: Palaeoecological records can provide important information on the nature of non-linear behaviour by identifying thresholds within ecological systems, and in outlining responses to ‘fast’ and ‘slow’ environmental change between alternative stable states. This study highlights the need to incorporate a long-term ecological perspective when designing strategies for maximizing coastal resilience.

Etiquetas de esta biblioteca: No hay etiquetas de esta biblioteca para este título.

Existencias ( 2 )
Notas de título ( 2 )

Existencias
Imagen de cubierta	Tipo de ítem	Biblioteca actual	Biblioteca de origen	Colección	Ubicación en estantería	Signatura topográfica	Materiales especificados	Info Vol	URL	Copia número	Estado	Notas	Fecha de vencimiento	Código de barras	Reserva de ítems	Prioridad de la cola de reserva de ejemplar	Reservas para cursos
	Artículo	Corley Smith Library Artículos		Galápagos		581.7 SED 2011 (Navegar estantería(Abre debajo))					Disponible			2020-1096
	Documento electrónico	Corley Smith Library Colección PDF		Galápagos		581.7 SED 2011 (Navegar estantería(Abre debajo))					Disponible			2021-1463

Navegando Corley Smith Library estanterías,Ubicación en estantería: Colección PDF,Colección: Galápagos Cerrar el navegador de estanterías (Oculta el navegador de estanterías)

Previo								Siguiente
Previo	581.7 ITO 1965 Preliminary note on the vegetation of the Galápagos Islands, Ecuador.	581.7 ITO 2003 Zonation pattern, succession process and invasion by aliens in species-poor insular vegetation of the Galápagos Islands /	581.7 REE 1975 Vegetation change along an altitudinal gradient, Santa Cruz Island, Galapagos /	581.7 SED 2011 Ecosystem resilience and threshold response in the Galapagos coastal zone /	581.7 STE 1915 Some observations concerning the botanical conditions of the Galapagos Islands /	581.7 VAR 2014 Plant colonization across the Galápagos Islands :	581.753 ITO 1990 Herbaceous and ericaceous communities in the highlands of Santa Cruz, the Galápagos Islands /	Siguiente

Background: The Intergovernmental Panel on Climate Change (IPCC) provides a conservative estimate on rates of sea-level rise of 3.8 mm yr 21 at the end of the 21st century, which may have a detrimental effect on ecologically important mangrove ecosystems. Understanding factors influencing the long-term resilience of these communities is critical but poorly understood. We investigate ecological resilience in a coastal mangrove community from the Galapagos Islands over the last 2700 years using three research questions: What are the ‘fast and slow’ processes operating in the coastal zone? Is there evidence for a threshold response? How can the past inform us about the resilience of the modern system? Methodology/Principal Findings: Palaeoecological methods (AMS radiocarbon dating, stable carbon isotopes (dC)) were used to reconstruct sedimentation rates and ecological change over the past 2,700 years at Diablas lagoon, Isabela, Galapagos. Bulk geochemical analysis was also used to determine local environmental changes, and salinity was reconstructed using a diatom transfer function. Changes in relative sea level (RSL) were estimated using a glacio-isostatic adjustment model. Non-linear behaviour was observed in the Diablas mangrove ecosystem as it responded to increased salinities following exposure to tidal inundations. A negative feedback was observed which enabled the mangrove canopy to accrete vertically, but disturbances may have opened up the canopy and contributed to an erosion of resilience over time. A combination of drier climatic conditions and a slight fall in RSL then resulted in a threshold response, from a mangrove community to a microbial mat.
Conclusions/Significance: Palaeoecological records can provide important information on the nature of non-linear behaviour by identifying thresholds within ecological systems, and in outlining responses to ‘fast’ and ‘slow’ environmental change between alternative stable states. This study highlights the need to incorporate a long-term ecological perspective when designing strategies for maximizing coastal resilience.

Inglés