Fig 1.
Location of the sampling sites.
Location of the sampling sites in the Sierra de Gredos Natural Park (Central Spain). Caballeros (A), Cimera (B) and Grande de Gredos (C) lakes. The upper right part of the figure was taken from a public domain (NASA Earth Observatory, http://earthobservatory.nasa.gov/). The others parts of the figure are owned by JSH.
Table 1.
Food web properties.
Table 2.
Food web topology.
Fig 2.
Functional feeding groups of the macroinvertebrate community in each lake.
Fig 3.
Three-dimensional visualization of the complexity of food webs from the three studied lakes in Central Spain. Image produced with software Foodweb3D available from the Pacific Ecoinformatics and Computational Ecology Lab (http://www.foodwebs.org/), and written by RJ Williams [59,60]. Balls are nodes that represent species and sticks are the links that connect balls through consumption. The vertical axis corresponds to trophic level, basal trophic levels (yellow) are on the bottom; upper trophic levels are on the top (red).
Fig 4.
Principal component analysis (PCA) plot based on four food web properties. This is a composed plot, made of: A and C parts- a plot of food web properties axes, position of lakes and eigenvalues projected into PCA, B and D parts- the projection of the food webs with ellipses and gravity center grouped by study.
Table 3.
Scores of eigenvalues.