The North Sea hosts numerous man-made structures, some recently installed and others nearing end-of-life, with
decisions about their decommissioning at the centre of current debate. Further there are plans for significant
expansion of structures relating in particular to offshore wind energy. Here, using a combination of hydrodynamic modelling, particle tracking, and graph network analysis, we evaluate connectivity under two scenarios:
existing structures – releasing particles from cells where structures are currently present – and “everything is
everywhere” – releasing particles from every cell in the domain. Additionally, we introduce a Connectivity
Importance Index (CII) to assess both current and potential future connectivity within the region. The CII under
the ‘everything is everywhere’ scenario revealed cells with high potential connectivity that align with, but also
extend beyond, those identified under the existing structures scenario, pointing to potentially valuable regions for future structure placement. The relocatable methodology described in this paper allows for the quantification of potential networks, applicable with or without existing habitat data, offering valuable insights for ecologically coherent marine spatial management strategies
