SfM and photo-quadrats obtained comparable results regarding species richness, percentage cover of identified taxa and most of the seascape metrics, while, in terms of taxa density estimations, photo-quadrats highly overestimated their values. ![]() lithophaga presenting a density of 88.3 holes/m 2. A total of 22 sessile taxa were identified, with Porifera representing the dominant taxa within the cave, and L. The results of SfM were compared with a more “traditional approach”, by simulating photo-quadrats deployments over the produced orthomosaics. Additionally, since impacts of recent date mussel Lithophaga lithophaga illegal fishing were recorded, a special emphasis was paid to its distribution and densities. The current study aimed to explore the potential of Structure from Motion (SfM) photogrammetry to assess the abundance and spatial distribution of the sessile benthic assemblages inside a semi-submerged marine cave. ![]() ![]() Nowadays, the rise of new approaches opens new possibilities to describe these peculiar ecosystems. Traditionally, monitoring approaches to survey marine caves have been constrained by equipment limitations and strict safety protocols.
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