Bfn Conclusions foreshore rubble: verschil tussen versies

Huidige versie van 24 okt 2017 om 15:54

Hard substrate

The results show that after the first year (T1), the foreshore rubble has already resembled similar or more species than in 2014 (T0). Both at the east and the western transect, the hydroids and Bryozoans form are the most abundant, followed by sea squirts, anemones, polychaete and other groups. This order remains the same in both years. As expected the coverage of hard substrate species is lower after the construction work, there is a shift visible in the most dominant species in coverage from Japanese oyster to Bryozoans. Species are developing better on the ecotop substrates of sandstone/quartzite and limestone, compared to gravel. On the gravel now communities of species are developing during the measurement period. This shows the significant increase of ecological potential caused by the used ecotop.

Soft substrate

Measurements show that the presents of the ecotops structures (reef shape structures) support the development of soft sediment deposition. In the most eastern part of the study area 10-30 cm sediment layers are present. At this locations it was possible to determine the contents of soft sediment species. Results show a fast recovery of soft substrate species. At the shallow parts 5-10 different species were present, and at the deeper parts 15-25 species.

European lobster

The development of the European lobster population show a slow recovery in number of species over the period 2015 (T1) and 2016 (T2). The number of individuals per cage was 0.13-0.95 over a three day measurement period. There was no significant increase in number over the two measurements.