Morphological Description of Endangered Seaweed Species in Abu Qir Bay,

Protecting the biodiversity of macroalgae in aquatic ecosystems is crucial for ecosystem stability. Documenting endangered species is the first step toward understanding and conserving at-risk species, their threats, and implementing necessary conservation measures to maintain biodiversity and ecosystem health. The current work documented and provided detailed morphological description of some significant seaweed species thriving in the coastal city of Alexandria, specifically in Abu Qir Bay, which has long been recognized by its rich and diverse macroalgae population. Several seaweed species were recorded between 2020 and 2022, including the green algae Codium decorticatum, C. effusum, C. taylori, C. vermilara, and Caulerpa cylindracea; the red algae Asparagopsis taxiformis, Chondracanthus acicularis, Gelidium crinale, Hypnea musciformis, and Petalonia fascia; and the brown alga Padina boryana. However, since 2023, the invaluable biodiversity reported previously has been lost due to extensive construction activities that reshaped the landscape of the Abu Qir area, except for several Ulva species. Recognizing the critical importance of preserving natural habitats against urbanization, prioritizing conservation efforts, raising awareness on sustainability challenges, and strengthening laws supporting species conservation are key steps to protecting biodiversity and ensuring a sustainable future.