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International audienceThe zooxanthellate mangrove jellyfish sp. represents a prominent invasive species and a potential bioindicator for nutrient monitoring in coral reefs. However, information about its spatial distribution in combination with abundance, habitat specificity and life cycle elements is barely available. This study, therefore, presents the results of field surveys conducted within four different benthic habitat types (coral reef, seagrass meadow, reef-sand transition and sand flat) in the Northern Red Sea. sp. exhibited a highly patchy distribution within the entire study area with mean abundance of 1.6 ± 0.3 animals m and benthic coverage of 3.2%. Within coral reef habitats, maximum abundance of up to 31 animals m and benthic coverage of up to 20% were detected. Additionally, this study revealed that 65% of all observed specimens were associated with the commensalistic crustacean mysid . abundance and size as well as association patterns with mysids differed between most of the surveyed habitats. In summary, the findings of the present study (1) characterize as one of the key organisms in investigated benthic habitats, (2) indicate active habitat selection by the jellyfish and (3) may hint to an unexplored life cycle of with central role of seagrass meadows providing cues for larval settlement and metamorphosis in the absence of mangroves

helgoland marine research

Spatial distribution of the upside-down jellyfish Cassiopea sp. within fringing coral reef environments of the Northern Red Sea: implications for its life cycle