Comparing convenience and probability sampling for urban ecology applications

Título traducido de la contribución: Comparando muestreos de conveniencia y probabilidad para aplicaciones en ecología urbana

Andrew Speak, Francisco J. Escobedo, Alessio Russo, Stefan Zerbe

Resultado de la investigación: Contribución a RevistaArtículo

2 Citas (Scopus)

Resumen

Los ecosistemas de bosques urbanos suministran múltiples servicios ecosistémicos. Por lo tanto, es necesario cuantificar las características ecológicas en términos de estructura y composición de la comunidad para que los beneficios puedan entenderse mejor en los modelos de servicios ecosistémicos. Los métodos eficientes de muestreo y monitoreo son cruciales en este proceso. Los inventarios de árboles completos son escasos debido al tiempo y las limitaciones financieras, por lo que existe una variedad de métodos de muestreo. Las encuestas de vegetación modernas utilizan cada vez más un muestreo estratificado basado en parcelas aleatorias para reducir el sesgo asociado con el muestreo de conveniencia, aunque este último puede ahorrar tiempo y aumentar las puntuaciones de riqueza de especies. El paisaje urbano, con un alto grado de agrupamiento conspecífico y una gran diversidad de especies, proporciona un caso biogeográfico único para comparar estos dos enfoques metodológicos. Utilizamos dos muestras de conveniencia espacialmente extensas del bosque urbano de Meran (Italia) y comparamos la estructura de la comunidad, las características de los árboles y la provisión de servicios del ecosistema con 200 parcelas circulares aleatorias. El muestreo de conveniencia resultó en una mayor diversidad de especies, incorporando especies más raras. Esto es el resultado de cubrir más área por unidad de tiempo de muestreo. Las subparcelas pseudoaleatorias se compararon con las parcelas aleatorias que revelaron índices similares de comparabilidad y diversidad de Shannon. Las variables de los árboles medidos (diámetro a la altura del pecho, altura, ancho de la copa del árbol, altura a la base de la corona) fueron similares entre los dos métodos, al igual que los resultados del modelo de servicio del ecosistema. Síntesis y aplicaciones. Nuestros resultados sugieren que el muestreo por conveniencia puede ser una alternativa de ahorro de tiempo y dinero al muestreo aleatorio, siempre que la estratificación por tipo de uso de la tierra se incorpore al diseño. La mayor riqueza de especies puede mejorar potencialmente la precisión de los modelos ecológicos urbanos, que se basan en rasgos funcionales específicos de la especie.
Idioma originalEnglish (US)
Páginas (desde-hasta)2332-2342
Número de páginas11
PublicaciónJournal of Applied Ecology
Volumen55
N.º5
DOI
EstadoPublished - sep 1 2018

All Science Journal Classification (ASJC) codes

  • Ecology

Citar esto

Speak, Andrew ; Escobedo, Francisco J. ; Russo, Alessio ; Zerbe, Stefan. / Comparing convenience and probability sampling for urban ecology applications. En: Journal of Applied Ecology. 2018 ; Vol. 55, N.º 5. pp. 2332-2342.
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title = "Comparing convenience and probability sampling for urban ecology applications",
abstract = "Urban forest ecosystems confer multiple ecosystem services. There is therefore a need to quantify ecological characteristics in terms of community structure and composition so that benefits can be better understood in ecosystem service models. Efficient sampling and monitoring methods are crucial in this process. Full tree inventories are scarce due to time and financial constraints, thus a variety of sampling methods exist. Modern vegetation surveys increasingly use a stratified-random plot-based sampling to reduce the bias associated with convenience sampling, even though the latter can save time and increase species richness scores. The urban landscape, with a high degree of conspecific clustering and high species diversity, provides a unique biogeographical case for comparing these two methodological approaches. We use two spatially extensive convenience samples of the urban forest of Meran (Italy), and compare the community structure, tree characteristics and ecosystem service provision with 200 random circular plots. The convenience sampling resulted in a higher species diversity, incorporating more rare species. This is a result of covering more area per unit sampling time. Pseudorandom subplots were compared to the random plots revealing similar Shannon diversity and sampling comparability indices. Measured tree variables (diameter at breast height, height, tree-crown width, height to crown base) were similar between the two methods, as were ecosystem service model outputs. Synthesis and applications. Our results suggest that convenience sampling may be a time and money saving alternative to random sampling as long as stratification by land-use type is incorporated into the design. The higher species richness can potentially improve the accuracy of urban ecological models, which rely on species-specific functional traits.",
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Comparing convenience and probability sampling for urban ecology applications. / Speak, Andrew; Escobedo, Francisco J.; Russo, Alessio; Zerbe, Stefan.

En: Journal of Applied Ecology, Vol. 55, N.º 5, 01.09.2018, p. 2332-2342.

Resultado de la investigación: Contribución a RevistaArtículo

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