42nd CIESM Congress, Cascais, Portugal, 7 - 11 October 2019, vol.42, pp.32
Cystoseira spp. forms an important habitat for many marine organisms in the Mediterranean infralittoral zone. Recently, pollution, increasing seawater temperature, turbidity, costal activities and over-grazing have all contributed to a decline in the populations of the Cystoseira spp. Especially in the Eastern Mediterranean, invasive alien species have become a concern. An increased number of herbivore fish and sea urchins has resulted in barren areas due to overgrazing. Although many studies aiming to understand the effects of grazing on algal forests exist, studies investigating its effect on the algal stress defense system are few. In the present study, we aim to investigate whether grazing causes a response in the algal defense mechanisms in terms of increased antioxidant enzyme (catalase, and ascorbate peroxidase) activities.