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Forest Ecosystems
Figure 7 | Forest Ecosystems

Figure 7

From: A spatially-explicit count data regression for modeling the density of forest cockchafer (Melolontha hippocastani) larvae in the Hessian Ried (Germany)

Figure 7

Contour plots displaying the spatial pattern of predicted larva density assuming a CTH of 0% and a DWT of 4 m employing negative binomial regression models (Eq.8.51) with conventional thin plate splines (A) and thin plate splines with 1 st order derivative penalty and slightly reduced dimension of the spatial trend (B). The transect highlighted by a dashed line connects the three geographic locations used in the model computations. The light gray triangle represents a location with a low, the dark gray circle with a medium, and the black square with a high spatial effect. The outermost isolines of the three distinct areas connect locations with predictions of 2 larvae · m−2.

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