Get Design and Analysis of Long-term Ecological Monitoring PDF

By Robert A. Gitzen, Joshua J. Millspaugh, Andrew B. Cooper, Daniel S. Licht

To supply invaluable and significant details, long term ecological courses have to enforce stable and effective statistical ways for accumulating and studying info. This quantity offers rigorous assistance on quantitative concerns in tracking, with contributions from global specialists within the box. those specialists have huge adventure in educating primary and complicated rules and techniques to typical source managers, scientists, and scholars. The chapters current a number of instruments and methods, together with distinct assurance of variance part estimation and quantitative choice between replacement designs; spatially balanced sampling; sampling ideas integrating layout- and model-based techniques; and complex analytical ways comparable to hierarchical and structural equation modelling. Making those instruments extra available to ecologists and different tracking practitioners throughout various disciplines, it is a important source for any expert whose paintings offers with ecological tracking. Supplementary instance software program code is accessible on-line at www.cambridge.org/9780521191548.

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The first, iterative approach of progressively lowering expectations can also simply end up at the same point as the second approach – “we don’t know what we want, but we do know what we can afford” – despite the best of initial intentions. Money is critical – but shouldn’t there be some safeguards against simply spending money because it is available? Because of this, we recommend defining “quality” and “usefulness” by also defining “worthlessness”. In addition to setting the desired level of power or precision needed by the program, also define some hard-line threshold or “floor” for minimum acceptable expected performance.

Therefore, from the standpoint of this volume, “design” of monitoring includes not only specification of how, where, and when to collect data, but also specification of the specific objectives for monitoring, which in turn is driven by the general rationale for monitoring. g. Wintle et al. 2010; Chapter 23). In this chapter, we provide our perspectives on the context for this volume, and discuss challenges and recommendations related to the design and analysis of monitoring. 1); these issues are discussed further in Chapters 2 and 22, and emphasized, implicitly or explicitly, by every other chapter.

A rushed, non-careful design phase is also likely when the impact of quantitative considerations on the quality of information produced by monitoring is underestimated. We have argued that frequent monitoring-design problems are often caused by insufficient knowledge and insufficiently careful approaches to monitoring design. These factors often lead ecologists (students, scientists, and managers) to underestimate their need for additional input from statistical experts (Millspaugh and Gitzen 2010), in monitoring as well as other contexts.

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