57
Fig. 2.4 Foraminiferal evolution showing upward-increasing abundance indicative of the environmental regeneration of the formerly reclaimed Axpe Sur salt marsh, Urdaibai estuary (Modified
from Leorri et al. 2014a)
Table 2.2 Foraminiferal quantification of absolute and relative abundances of tests and species for
estuaries in northern Spain
Abundance
Very low Low
Moderate
High
Very high
Number of tests/50 g
<100
100–299
300–1999
2000–4999
≥5000
Number of species
<5
5–9
10–19
20–29
≥30
% allochthonous tests
<20
20–39
40–59
60–79
≥80
% dominant species
≥10
% secondary species
2–9
% minor species
<2
Modified from García-Artola et al. (2016)
Fig. 2.5 Upwardincreasing sand profile
indicative of the
environmental regeneration
of the formerly reclaimed
Axpe Sur salt marsh,
Urdaibai estuary (Modified
from Leorri et al. 2014a)
2 Recent Agricultural Occupation and Environmental Regeneration of Salt...