A specialist-generalist classification of the arable flora and its response to changes in agricultural practices

BMC Ecology

Table 4 Methods, references and data used to compute the six species habitat breadth indices and species niche position index

Method and reference	Applications to plant communities	# of plots	Habitat variables
I₁ (RS) Reciprocal scaling [43]	[53]	2896 *	None
I₂ (CCA-SD) Canonical Correspondence Analysis [44]	[54]	694	See list **
I₃ (CCA-Rao) Canonical Correspondence Analysis [47] based on [45, 46]	-	694	See list **
I₄ (OMI) Outlying Mean Index analysis [48]	[55]	694	See list **
I₅ (IV) IndVal [49]	[50]	694	See list **
I₆ (Sophy) Species mean socio-ecological distances [51]	[51]	2896 *	None

2896 * = 724 fields with 2 plots surveyed twice a year
List ** includes habitat variables: Altitude, Mean temperature, Total rainfall, Evapotranspiration, Soil pH, Soil texture, Crop, Preceding crop, Sowing date, Tillage system and Tillage depth.
Tillage system: no-tillage (i.e. implementing direct drilling), minimum tillage which consists in only chiselling the soil and conventional tillage including tilling the soil with mouldboard plough followed by one or more harrow and/or cover-crops passage(s).

ISSN: 1472-6785