کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4376926 1303400 2011 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Equivalence of the realized input and output oriented indirect effects metrics in Ecological Network Analysis
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک بوم شناسی، تکامل، رفتار و سامانه شناسی
پیش نمایش صفحه اول مقاله
Equivalence of the realized input and output oriented indirect effects metrics in Ecological Network Analysis
چکیده انگلیسی

A new understanding of the consequences of how ecosystem elements are interconnected is emerging from the development and application of Ecological Network Analysis. The relative importance of indirect effects is central to this understanding, and the ratio of indirect flow to direct flow (I/D) is one indicator of their importance. Two methods have been proposed for calculating this indicator. The unit approach shows what would happen if each system member had a unit input or output, while the realized technique determines the ratio using the observed system inputs or outputs. When using the unit method, the input oriented and output oriented ratios can be different, potentially leading to conflicting results. However, we show that the input and output oriented I/D ratios are identical using the realized method when the system is at steady state. This work is a step in the maturation of Ecological Network Analysis that will let it be more readily testable empirically and ultimately more useful for environmental assessment and management.


► We investigate input and output oriented ratios of indirect-to-direct effects.
► Realized input and output I/D ratios are identical.
► This is a maturation step for Ecological Network Analysis and ecosystem theory.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ecological Modelling - Volume 222, Issue 13, 10 July 2011, Pages 2142–2148
نویسندگان
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