Dung-beetle networks

<div>This folder contains datasets from studies on the distribution of dung beetle species across two or more types of dung (trophic networks). Each file is named by the reference. For an overview of references and additional information, see ELEblüthgenST1.xlsx</div><div><br></div><div>Reference:</div><div><div>Frank K, Krell FT, Walter P, Slade EM, Raine EH, Chiew LY, Vairappan CS, Schmitt T, Blüthgen N (2018) Global dung webs: high trophic generalism of dung beetles along the latitudinal diversity gradient. Ecology Letters, in press. </div></div

Hypothetical causal pathways of the effects of environmental change on insect-mediated ecosystem processes.

<p>Shaded boxes indicate the causal hypotheses (complementarity effect, trait-mean effect, or neutral effect).</p

Variation in total beetle biomass and proportion of dung removed across degraded and regenerating edges.

<p>Points and error bars are mean ±1 SE. Open symbols and dashed fitted lines denote degraded edges, whereas closed symbols and solid fitted lines denote regenerating edge gradients. Negative values on the x-axis indicate forest sites. Lines are the best-fit continuous edge response functions of five fitted models of increasing complexity. Both model fits in (a) are linear, while the model fit for regenerating edges in (b) is linear and for degraded edges in (b) is unimodal (see <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0115385#pone.0115385.s011" target="_blank">Appendix S3</a>). Overlapping points are offset for clarity.</p

Causal pathways of functional responses to edge effects and matrix restoration.

<p>Best-fit generalized multilevel path model structure (χ² = 44.964, df = 54, P = 0.805) as determined by the <b><i>B</i></b><i>_U</i> set of independence claims (<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0115385#pone.0115385.s008" target="_blank">Table S4</a>). Boxes depict predictor and response variables and arrows indicate significant positive (blue) and negative (red) effects, with non-significant effects indicated by a dashed arrow. Circular nodes with arrows leading to them represent interaction terms. R² values in the endogenous variables indicate the strength of fit for individual models. Values within and adjacent to arrows are the unstandardized path coefficients with level of significance (* p<0.05, ** p<0.01, *** p<0.001). Line weightings indicate the relative strength of effects as derived from the standardized path coefficients.</p