WP2 field activities on Restoration of Marine, shallow soft bottoms habitats

The field experiment at the Wadden Sea island of Griend

In the Netherlands, at the Wadden Sea island of Griend, a large scale field experiment was setup in March 2017 to study the facilitating effects of mussel beds (M. edulis) on seagrasses (Z. marina) planted in the wake of the mussel beds. As a settlement structure for the mussel beds and seagrass plots, biodegradable structures were placed made from potato waste-derived starch called 'BESE' (Biodegradable Elements for Starting Ecosystems, developed by Bureau Waardenburg). The experiment will be followed over the next 2 years. The experiment is a collaborative effort between four projects: MERCES, Griend, STW Bridging Thresholds, STW all-risk, and conducted by Radboud University Nijmegen, Bureau Waardenburg, Netherlands Institute of Sea Research, Groningen University, and the Fieldwork company.

 

Figure 1. Settlement of "BESE-elements" (credits: Laura Govers)

 

Figure 2. View of Biodegradable Elements for Starting Ecosystems (credits: Laura Govers)

  

Figure 3. Left, settlement  (credits: Laura Govers); right, an aerial view of the "BESE-elements" (credits: the field work company)



Survey on seagrass meadows (West-Central Adriatic Sea) - UNIVPM

On the 22th and 23th May 2017 UNIVPM carried out a field survey at Gabicce Mare (West-Central Adriatic Sea) with the aim to map the distribution of the seagrass meadows and to collect environmental data and sediment samples.

 

    

Beach of Gabicce Mare (West-Central Adriatic Sea)

  

Zostera marina meadows

   

Different densities of Z. marina meadows.

 

Survey on seagrass meadows (West-Central Adriatic Sea) - ECOREACH and UNIVPM

On July 22nd 2016, Ecoreach team has participated to the preliminary survey in seagrass ecosystems in the West-Central Adriatic Sea, led by UNIVPM, at Gabicce Mare. The survey was conducted in order to verify the presence and the status of the seagrass meadows, following the breakwater relocation conducted by the Gabicce Municipality between 2014 and 2015. Video link: https://www.youtube.com/watch?v=ktxVYsgwoHM

 

Gabicce mare location (a) and city view from satellite (b)      

Satellites imagines before (2001-2012) and after (2016) breakwater relocation conducted by the Gabicce Municipality between 2014 and 2015

3 x 100 m transects: A and B inside the breakwater structures (yellow lines), perpendicular to the shoreline and C outside (red line), parallel to the structures. Visual surveys (yellow stars) along meadow edges and in previous experiment sites

      

MERCES team from the UNIVPM surveyed Gabicce mare by apnea diving and snorkelling


Restoration in soft shallow habitats (Gökova Bay and Foça, Aegean Sea) - MCS  

The survey, run within the local Marine Protected Area, covered the entire water column from 35m of depth to the surface and focused on the status of Posidonia oceanica. This marine plant plays crucial roles in coastal ecosystems, such as: oxygenation of water, reduction of coastal erosion, nursery for many marine species (including some of commercial interest). That's why we need to protect Posidonia meadows, and restore them whenever possible. 

  

MERCES team from the Akdeniz Koruma Derneği / Mediterranean Conservation Society surveyed Gökova Bay (Turkey) by diving and snorkelling

Surveys for case study areas Gökova Bay and Foça: Posidonia oceanica meadows (a); Aplysina aerophoba (b), Pinna nobilis (c) and Posidonia oceanica unhealthy meadow (d)      


Quest for holes in the Posidonia meadows (Dugi Otok Island, Central Eastern Adriatic) - PMF Zagreb

In September 2016, PMF Zagreb team carried out field work on the Dugi Otok Island (the Central Eastern Adriatic) with the goal to investigate circular damage to Posidonia meadows. These "holes" in Posidonia were observed previously from the aerial images along the Croatian coast, and later, more closely examined in order to characterize them, inspect the natural re-growth and assess the potential for active restoration at the selected sites.

    

Monitoring before restoration actions in shallow marine habitats: Surface (a) and underwater (b) view of the inner border of Posidonia oceanica meadow ; c) setting a transect across damaged P. oceanica meadow; P. oceanica leaves accumulations on the beach

     

Dead matte surrounding the hole caused by the dynamite fishing                                                                     

Documenting a video transect across the circular damage in the Posidonia meadow


Restoration in the Gulf of Riga (Baltic Sea) - marinaSeagrass Zostera UTARTU

At the end of July 2016, a fieldwork was conducted in the Gulf of Riga, with the aim to identify the suitable donor site as well as location for replanting of Z. Marina

       

Seagrass Zostera marina bed in the donor site                  Sampling of phytobenthos in the experimental site