Fig 1.
Study area in the Balearic Islands showing sampling localities (white dots) among islands.
Table 1.
Results of the PERMANOVA analysis for data on P. nobilis density, shell size and % of presence.
Fig 2.
Density of P. nobilis populations.
Densities of living P. nobilis (ind/100m2) found across islands and localities. (Note that density scale differs for Cabrera).
Fig 3.
Mean values (±standard error) of living P. nobilis density (individuals/100m2) among islands.
Median values are included, the rectangles contain values between the first and the third quartiles, the bars represent the variability outside the upper and lower quartiles, outliers are shown as circles. SNK groups are shown by numbers.
Fig 4.
Mean values of P. nobilis shell size across: a) Islands and b) Depth.
Mean values (±standard error) of living P. nobilis shell size (maximum width). Median values are included, the rectangles contain values between the first and the third quartiles, the bars represent the variability outside the upper and lower quartiles, outliers are shown as circles. SNK groups are shown by numbers.
Table 2.
Results of DistLM for: a) living P. nobilis densities, major variables; b) living P. nobilis densities; and c) living P. nobilis sizes.
Table 3.
Results of DistLM for mortality (percentage of dead P. nobilis).
Fig 5.
Relationship between the ordination of (A) living P. nobilis densities, and (B) living P. nobilis size, and environmental and human variables.
Environmental variables: MD: mean depth, Hs: Hs mean, HsM: Hs maximum, Tp: mean Tp, MDir: mean direction. Human variables: A: anchoring, P: protection status, S: sewage effluents, F: fishing activity and D: diving.
Fig 6.
Relationship between the ordination of P. nobilis mortality (% dead P. nobilis individuals) and environmental and human variables.
Environmental variables: MD: mean depth, Hs: Hs mean, HsM: Hs maximum, Tp: mean Tp, MDir: mean direction. Human variables: A: anchoring, P: protection status, S: sewage effluents, F: fishing activity and D: diving.