Breeding avifauna of a Mediterranean succession: the holm oak and cork oak series in the eastern Pyrenees, 1. Analysis and modelling of the structure gradient.

摘要: Within the Mediterranean level of Alberes chain, 186 samples were taken in different formations from grassland to forest, with presence-absence sampling bird and plant species, estimation relative cover 7 vegetation layers, plus rock itself. After multidimensional ordination (Correspondence Analysis) birds x stations matrix, multiple correlation first factor F1 C.A. 8 values, a model results which, (1) proves that F. is expression progressive evolution structure, (2) shows there logarithmic relationship between this structural species turnover, (3) permits calculation, for any station studied region, optimal indices avifaunistic gradient structure gradient, (4) allows one predict semi-quantitatively, probable avifauna station, vice versa. This analysis good alternative classical (unidimensional sequence discrete classes), especially when an ecological succession reconstructed simultaneous comparison stations.