This article elaborates a conceptual framework to examine social sustainability in marine spatial planning (MSP). Based on a critical literature review of key texts on social sustainability in MSP and the broader sustainable development literature we show the need to elaborate a cogent and comprehensive approach for the analysis and pursuit of social sustainability linked to the sea. We then theorize social sustainability by developing a conceptual framework through integrating three dimensions: Recognition, Representation and Distribution. While these three social sustainability/justice features clearly overlap and are interdependent in practice, the conceptual thinking underpinning each of them is distinctive and when taken together they contribute towards conceiving social sustainability as a pillar of sustainability. Our approach can support an analysis/evaluation of MSP in that, first, its broad scope and adaptability makes it suitable to examine the wide range of claims, demands, and concerns that are likely to be encountered across different practical MSP settings. Second, it acknowledges the opportunities and challenges of assessing, implementing, and achieving social justice within a broader sustainability framework.

Zooplankton as an essential component in the pelagic food web are directly linked to pelagic ecosystem functioning. Therefore, comprehension of zooplankton functional diversity (FD) and its responses to environmental changes is crucial for ecosystem-based view. To identify FD responses to environmental drivers, we analysed 25 years of summer data on the brackish mesozooplankton community (including rotifers, cladocerans, copepods, and meroplankton) from the eutrophied, shallow Gulf of Riga (Baltic Sea). We established that within the Gulf of Riga, open waters are notably different from coastal regions based on the dynamics of hydrological conditions (temperature, salinity), cyanobacterial dominance, abundance of mesozooplankton functional groups, and mesozooplankton FD indices. Competition over resources in combination with hydrodynamic features and predation by adult herring were seemingly the central structuring mechanism behind the dynamics of FD metrics (richness, evenness, divergence, and dispersion) within coastal mesozooplankton communities. Whereas predation by young herring was an important driver only for the mesozooplankton communities in the open waters. Cyanobacterial dominance, used as a proxy for food quality and availability, had no effect on summer mesozooplankton FD metrics.

This data article describes the occurrences of the moon jelly Aurelia aurita medusae in the Gulf of Riga and Eastern Gotland Basin (Baltic Sea) between 1998 and 2023. All data are incidental observations obtained during Latvian national monitoring cruises. Gelatinous zooplankton is not a standard group in regional marine monitoring, and jellyfish are not intentionally monitored within the framework of national marine monitoring by many countries across the Baltic Sea region. Hence, the information about A. aurita medusae occurrences in the area is scarce, especially long-term. The data also describe the seasonal dynamics of A. aurita medusae presence. Most frequently, observations occur from August to October in the studied area. However, the earliest observation of A. aurita medusae was recorded in July and the latest observation was in late November. These data provide relevant contributions to comprehending the seasonal and long-term dynamics of gelatinous zooplankton, specifically A. aurita. Moreover, the data can be used as a baseline for future studies on the eastern Baltic Sea addressing climate change and anthropogenic forcing impacts.