English to Spanish Tech/Engineering Geology Marine surveys

Related to my previous question, for a marine survey, pls see below thanks

(b) nMDS Ordination Plot
A nMDS plot was calculated using the macrofaunal results combined with the PSA data, incorporated as a factor (Figure 33).
The illustration shows a useful separation of the observed macrofaunal assemblage in respect to the particle size distributions within the survey area(2d stress=0.16).
Samples from cluster 3 (light blue squares) and cluster 4 (green triangles) showed higher similarities to each other than those of the other two clusters.
Figure : nMDS Ordination Plot of Stations (0.2m2)
Environmental Variables
Pearson product-moment correlation coefficient shows the covariance of two variables divided by the product of their standard deviations.