Relationship between thermal and habitat niches for 74 European bird species.

<p>(<b>A</b>) Relationship between niche positions; (<b>B</b>) relationship between niche breadths. The linear relationships (dashed lines) and their confidence intervals (dotted lines) are derived from averaged coefficients resulting from phylogenetic generalized least square regressions, after AICc-based model selection. Thermal positions and breadths are log transformed to approach a normal distribution. Both thermal and habitat positions are scaled to mean = 0, SD = 1. DELURB: <i>Delichon urbicum</i>, HIRRUS: <i>Hirundo rustica</i>. MOTALB: <i>Motacilla alba</i>. MOTFLA: <i>Motacilla flava</i>, PASDOM: <i>Passer domesticus</i>. PICPIC: <i>Pica pica</i>. STRDEC: <i>Streptopelia decaocto</i>. STRTUR: <i>Streptopelia turtur</i>.</p

Results of the model selection process.

<p>Models are phylogenetic generalized least square regressions with either climatic niche position or breadth as the response variable. Fixed predictors included migratory status (migr), age of first breeding (AFB), and either habitat niche position (HPI) or breadth (SSI) according to the model. The intercept is noted <i>γ</i>; <i>k</i> corresponds to the number of model parameters. The ΔAICc refers to the difference between the AICc of model <i>i</i> and that of the model with the lowest AICc value. The column “weight” refers to AICc weights, which were used to compute the averaged coefficients of the fixed effects.</p

Definition of the ecological niche used in this article.

<p>(<b>A</b>) The environmental space can be represented as a set of axes (here, two: <i>X</i>, <i>Y</i>), each representing a gradient of resource or condition. A species' niche is defined as the range of each of these gradients that the species can exploit/occupy/cope with (yellow ellipse). The projection of the niche on each gradient is defined by a position (<i>P_x</i>, <i>P_y</i>) and a breadth (red solid lines). In our analyses, we consider two axes: (<b>B</b>) <b>a thermal axis</b> (referred to in the text as ‘thermal niche’) corresponds to a gradient of temperature; (<b>C</b>) <b>a habitat axis</b> (‘habitat niche’) refers to a gradient of vegetation structure ranging from mature forest to grasslands and open fields (see also <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0032819#pone-0032819-t001" target="_blank">Table 1</a>).</p

Data from Paillet te al. JAE 2018

Data from Paillet te al. JAE 201

Oak leaf litter trait & decomposability as well as environmental variables data

File includes data about the oak leaf litter trait (litter quality), decomposability (ex situ decomposition processes). It also includes plots characteristics and environmental variables (understory light availability, understory vegetation and soil abiotic properties) used in the path analysis. We also included the abundance of each species for the understory plant community