[Nevermind the missing references, I left the \citep commands for completeness. The fancyheader commands help in illustrating the actual indent.]
Many thanks!
Code: Select all
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\begin{document}
\begin{longtable}{>{\raggedright}p{0.2\textwidth}cp{0.6\textwidth}}
\caption[Overview of selected fragmentation metrics.]{Selected fragmentation indices. Symbols follow authors' convention or \citet{mcg02}. Interior area is defined as the area whose boundary is a specified distance inwards from the patch perimeter, with the specified distance varying with the process or species of interest. The seminal reference of each metric is provided.}\label{table:metrics_introduction}\\
\toprule
Metric name& Symbol& Description \& Reference\\
\midrule
Number of patches& NP (DEN) & Number of patches (patch density) of a particular class (or classes pooled) \citep{tur89}\\
Mean patch size& MPS& Average area of a patch of a particular class (or classes pooled) \citep{mcg02}\\
Modified Euler number& $\varepsilon\ast$& Spatial integrity, based on the number of fragments and perforations \citep{bog02.2}\\
Largest patch index& LPI& Percentage of landscape area occupied by the largest patch (of a class) \citep{mcg95}\\
Nearest neighbor distance& $d_{ij}$& Distance from patch \textit{i} to the nearest occupied patch \textit{j}, measure of patch isolation \citep{har98}\\
Proximity index& PX& Sum of area of all patches within a fixed distance of the focal patch \citep{gus92}\\
Patch coherence index& C& Tendency of pixels to aggregate, quantifies patch size evenness \citep{jae00}\\
Monmonier index& F& Aggregation of pixels into patches, measure of image complexity \citep{mon74}\\
Contagion index& D$_{2}$& ``Clumpiness'' of a map based on pixel adjacency \citep{one88}\\
Interspersion/\-Juxtaposition index& IJI& ``Clumpiness'' of a map based on patch adjacency \citep{mcg95}\\
Patch cohesion index& PC& Area weighted perimeter-to-area ratio divided by area weighted mean shape index \citep{sch96}\\
Contiguity of cells& G$_{1}$& Spatial connectedness of pixels, uses sliding window \citep{lag91}\\
Clustering of pixels& G$_{2}$& Spatial clustering of pixels, uses sliding window \citep{lag91}\\
Adjacency probability& p$_{c}$& Probability that the nearest neighbor of a pixel of class \textit{a} is also a pixel of class \textit{a}, alternative measure of contiguity \citep{rii00}\\
Lacunarity index& L& Number of cells of a particular class inside a sliding window \citep{plo93}\\
Interior-to-edge ratio& I/E& Presence of interior area relative to edge area, dependent on centripetal perturbation \citep{for81}\\
Fractal dimension& FDI& Complexity of patch geometry, uses perimeter-to-area relationship \citep{kru87}\\
Composite metric& $\Phi_{f}$& Comprehensive measure incorporating patch size, perimeter, isolation, and number of patches \citep{bog00.2}\\
\bottomrule
\end{longtable}
\end{document}
