Università Politecnica delle Marche - La Vela Portonovo

Restoration Project

Università Politecnica delle Marche - La Vela Portonovo

Restoration Objective:

Here, we explored the potential use of G. barbata stranded along the shores after a storm, for the restoration of this species. The aim of this study was to assess the efficacy of an approach based on the collection of fertile stranded specimens of G. barbata, otherwise lost from the marine habitats, to generate vital and healthy offspring than can promote the recovery of this species.

Site Selection Criteria:

Where the historical presence of G. barbata was previously documented (Perkol-Finkel & Airoldi 2010). G. barbata current occurrence along the Conero Riviera has been recently documented (Orfanidis et al. 2021)

Cause Of Decline:

A dramatic loss of fucoid species was reported also in theAdriatic Sea (Rindi et al. 2020), with their replacement withless-structured turf-forming algae, preventing in turn canopy-forming-species recruitment (Orlando-Bonaca et al. 2021). This phenomenon was widely documented along the Conero Riviera (North-Eastern Adriatic Sea) for four fucoid species (Fucus virsoides, Cystoseira foeniculacea, C. humilis, and Sargassum acinarium). The main driver of this forest loss is the human impact on coastlines, increasing sediment resuspension, high nutrient concentrations, and loads (Rindi et al. 2020). As a result, only C. compressa and Gongolaria barbata are still present, even though the latter species is in regression, due to their greater tolerance to environmental stress (Orlando-Bonaca et al. 2022).

Key Reasons For Decline:

Sedimentation

Urbanisation

Water Pollution

Scientific Paper

Stranded seaweeds (Gongolaria barbata): an opportunity for macroalgal forest restoration

Marletta, G., Sacco, D., Danovaro, R., & Bianchelli, S. (2024).https://onlinelibrary.wiley.com/doi/abs/10.1111/rec.14134

Site Observations:

Observation Date

1st Jul 2024 – 1st Aug 2024

Action Summary:

Fertile apices of stranded kelp were collected and cultured ex situ on clay tiles for 3 months, then outplanted 58 km south at the restoration site on steel structures fixed to the sea floor. Tiles were monitored for 4 weeks following outplanting.

Lessons Learned:

Stranded fertile material can be repurposed to produce recruits for restoration, offering a low-impact, circular approach with high early survival.

Project Outcomes:

This study shows the feasibility of using fertile thalli strandedon the beach to obtain recruits for restoration, without damaging natural populations and habitats (Ferretto et al. 2021). This approach showed high recruitment success and growth during the cultivation in mesocosms and after the outplant. Indeed, the recruits continued to growin length and showed a survival of up to 80% after 1 month in the field. During the maintenance in mesocosms and in the field after the outplant, we detected a difference in the recruits growth and density depending on the sampling location. Such differences could be due to the variability among different populations, or some specimens may have been exposed to desiccation for a longer time, limiting their reproductive capacity.

Area of Restoration (Ha)

0

Indicator Data:

Indicator:

Ending Value:

Starting Value:

Juvenile Kelp Density

24.9000
/ m2
45.7000
/ m2
Transplant Info:
Life Stage:Juveniles
Source:Culture