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2 resultados encontrados para: AUTOR: Wootton, Allen
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1.
- Artículo con arbitraje
Land use change and urban ecosystem services: a case study of urban wetlands in a rapidly sprawling city in the highlands of Chiapas, Mexico
Camacho Valdez, Vera ; Tello Alcaide, Eva M. (coaut.) ; Wootton, Allen (coaut.) ; Valencia Barrera, Emmanuel (coaut.) ;
Contenido en: Journal of Management and Sustainability Vol. 9, no. 1 (March 2019), p. 67-81 ISSN: 1925-4725
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Resumen en: Inglés |
Resumen en inglés

Urban wetlands provide a wide range of ecosystem services that are important for human-well-being. Despite their social and environmental importance, the degradation of urban wetlands continues mainly due to land use changes induced by rapid urbanization. Estimating the impact of these changes on ecosystem services is crucial to support the decision-making process of city planners at different levels. In this study, the spatial extents of the urban wetlands of San Cristobal de Las Casas, Chiapas, Mexico were determined for the years 2001 and 2018 in order to relate the spatial changes between these years with the provision and economic value of ecosystem services. Google Earth and SPOT imagery were used to evaluate land use/land cover changes while international coefficients were used to assess the value of the ecosystem services by category. Findings reveal a 7.3% decrease in the urban wetland area and a 12.5% increase of urban areas during the study period. The ecosystem service valuation shows that the total value flow decreased around $5 million (2007 USD) during the 17-year period, mainly due to decreases in the potential for regulating and cultural services. The use of freely available land use/land cover data together with global ecosystem service estimates reduce the cost of ground data collection and provides quick and reliable information that could help decision makers with land use planning in the context of data-scarce regions.


2.
Artículo
*Solicítelo con su bibliotecario/a
Patterns of flow, leaf litter and shredder abundance in a tropical stream
Wootton, Allen ; Pearson, Richard G. (coaut.) ; Boyero, Luz (coaut.) ;
Contenido en: Hydrobiologia Vol. 826, no. 1 (January 2019), p. 353-365 ISSN: 1573-5117
Nota: Solicítelo con su bibliotecario/a
Resumen en: Inglés |
Resumen en inglés

The seasonal dynamics of leaf litter and associated consumers (“shredders”) in tropical streams are not well documented. We investigated the occurrence of litter (density and age composition) and shredders through late dry, wet and early dry seasons in an Australian rainforest stream. Leaf litter packs of varying density and leaf age covered most of the stream bed in the late dry season, but a one-in-one-year flood removed a substantial proportion of the sparse packs and much of the intermediate-aged litter, with green litter becoming more prevalent. Shredder abundances declined accordingly, but recovery was rapid, demonstrating substantial resilience to the disturbance. In a 36-day field experiment using fine- and coarse-mesh bags, green litter was decomposed more rapidly than intermediate and aged litter by both microbes and shredders, an unexpected and important result, given the abundance of green litter in the study stream. The resilience of shredders to moderate flood, their ability to process green leaves and their continued presence across seasons contribute to seasonal consistency in detrital-based food webs in the study stream except, perhaps, after extreme floods. This study demonstrates the need to consider the temporal changes in litter composition and decomposition in determining the nature of trophic processes in streams.