Marine mega-herbivore – dugongs (Dugong dugon) and green sea turtles (Chelonia mydas) – populations are declining due to various threats. Their primary food source, seagrass, is globally decreasing, making seagrass restoration crucial for the conservation of these species. Seagrass habitats also support the oceans’ nutrient cycles and biodiversity. While seagrass restoration efforts are increasing worldwide, seed-based restorations remain understudied. Marine mega-herbivores are not only dispersing seagrass seeds, but also the seed passage through their gut enhances germination, although the cause is unknown. This study aimed to investigate whether the high nitrogen and phosphorus content of the faeces contributes to this phenomenon. Marine mega-herbivore faeces and sediment core samples were collected from two seagrass meadows in Townsville, and an aquarium experiment was conducted to compare seed germination rates between faeces and non-faeces treatment. The findings highlight the potential of marine mega-herbivore faeces in improving seagrass seed germination. However, the high initial mortality rate and the number of ungerminated but viable seeds suggest further investigation into optimal storage conditions and extended duration for germination. Our results are promising for future seagrass restoration efforts and the conservation of marine mega-herbivores, suggesting the use of faeces treatment for enhanced success in seagrass restoration and biodiversity.
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