Social and economic sustainability of multiple-use marine protected areas in Spain: A mixed methods, multi-scale study

Social perception is key to the success of biodiversity conservation policies. A range of socioeconomic guilds can be affected by marine conservation. Among them, fishers are the ones most likely affected and affecting marine protected areas (MPAs). Here, we assessed the perceptions on the sustainability of a type of multiple-use MPA, Fishing Reserves (FRs), by a broad spectrum of national (n = 16) and local (n = 14) stakeholder organisations pertaining to six socioeconomic sectors via two online surveys in Spain. We compared organisational perception by stakeholder organisations, and specifically by the fishing guild, with official fishing statistics for six FRs between 1998 and 2016 using a Before-After-Impact (BAI) research design. Spanish FRs were regarded as sustainable marine management tools by most marine and coastal stakeholders, with environmental effects perceived to be more positive than social and economic ones, respectively. However, primary sector organisations stated null or negative effect of FR designation on their activities, although official statistics showed a moderate to large increase in a number of professional fishing-related variables, including number of boats and crews, after designation of most FRs. Spatial scale did not affect stakeholder perception of local socioeconomic effects of FRs, although some relevant local socioeconomic variables that were thought to vary most after FR designation differed across scales. Some suggested managerial improvements for increased socioeconomic sustainability of Spanish FRs by the professional fishing guild included: greater stakeholder engagement in FR designation and operation, more flexible fishing regulations and stricter control of recreational fishing

Assessing the environmental effectiveness of the Spanish Marine Reserve Network using remote sensing

Healthy marine ecosystems provide a variety of ecosystem services crucial for human wellbeing. Effectively managed Marine Protected Areas (MPAs) are increasingly recognized to be an effective measure to protect endangered species and ensuring healthier ecosystems. This study assesses the environmental effectiveness of the Spanish Marine Reserve Network (MRN) with regard to: 1) water quality: chlorophyll-a concentrations (Chl-a), sea surface temperature (SST), and Salinity; and 2) protected species conservation: coverage and density of Posidonia oceanica (P. oceanica), using a Multiple-Paired-Before-After-Control-Impact (MPBACI) research design. Water quality and protected species indicators were compared before and after Marine Reserve (MR) designation, inside MRs and in different outer control areas of 1 km, 5 km, 10 km and equal-area buffers, for the whole MRN (Marine Reserve Network), by marine ecoregions and for some specific MRs. We used Copernicus Marine Monitoring Remote Sensing data to ascertain water quality values and validated their accuracy compared to in-situ data as well as the reliability of Chl-a concentration derived from Sentinel 2 (S2) images. Water quality results reveal significant differences in mean Chl-a and Chl-a range, mean Salinity and SST range between cases (inside MRs) and 5 km-buffer control areas for the entire MRN. Analyses by ecoregion showed no significant differences in water quality between cases and controls in the Western Mediterranean ecoregion or in the Azores, Canaries and Madeira ecoregion, whereas the Alboran Sea ecoregion MRs had higher mean Chl-a concentration and lower mean Salinity, mean SST and SST range than all controls. Results on P. oceanica beds showed a significant increase in P. oceanica density (almost twice) inside Tabarca MR (TBA) compared to outer control cases, but no significant changes in P. oceanica coverage. Validation of Remote Sensing (RS) data using in-situ measurements demonstrated significant differences for Chl-a concentration and no significant differences for SST and Salinity between both techniques. Chl-a concentration by S2 reveals statistically significant differences with in-situ data. Our findings suggest environmental effectiveness of the Spanish MRs and still limited sensitivity of open source medium resolution RS tools to assess MPA effectiveness

Assessing the environmental effectiveness of the Spanish Marine Reserve Network using remote sensing

Healthy marine ecosystems provide a variety of ecosystem services crucial for human wellbeing. Effectively managed Marine Protected Areas (MPAs) are increasingly recognized to be an effective measure to protect endangered species and ensuring healthier ecosystems. This study assesses the environmental effectiveness of the Spanish Marine Reserve Network (MRN) with regard to: 1) water quality: chlorophyll-a concentrations (Chl-a), sea surface temperature (SST), and Salinity; and 2) protected species conservation: coverage and density of Posidonia oceanica (P. oceanica), using a Multiple-Paired-Before-After-Control-Impact (MPBACI) research design. Water quality and protected species indicators were compared before and after Marine Reserve (MR) designation, inside MRs and in different outer control areas of 1 km, 5 km, 10 km and equal-area buffers, for the whole MRN (Marine Reserve Network), by marine ecoregions and for some specific MRs. We used Copernicus Marine Monitoring Remote Sensing data to ascertain water quality values and validated their accuracy compared to insitu data as well as the reliability of Chl-a concentration derived from Sentinel 2 (S2) images. Water quality results reveal significant differences in mean Chl-a and Chl-a range, mean Salinity and SST range between cases (inside MRs) and 5 km-buffer control areas for the entire MRN. Analyses by ecoregion showed no significant differences in water quality between cases and controls in the Western Mediterranean ecoregion or in the Azores, Canaries and Madeira ecoregion, whereas the Alboran Sea ecoregion MRs had higher mean Chl-a concentration and lower mean Salinity, mean SST and SST range than all controls. Results on P. oceanica beds showed a significant increase in P. oceanica density (almost twice) inside Tabarca MR (TBA) compared to outer control cases, but no significant changes in P. oceanica coverage. Validation of Remote Sensing (RS) data using in-situ measurements demonstrated significant differences for Chl-a concentration and no significant differences for SST and Salinity between both techniques. Chl-a concentration by S2 reveals statistically significant differences with in-situ data. Our findings suggest environmental effectiveness of the Spanish MRs and still limited sensitivity of open source medium resolution RS tools to assess MPA effectivenes