What are two main abiotic factors that affect organisms in marine ecosystems?

Two main abiotic factors that affect organisms in marine ecosystems are temperature and salinity. Temperature influences metabolic rates and reproductive cycles of marine species, while salinity affects osmoregulation and the distribution of organisms. Together, these factors help shape the diversity and abundance of life in various marine environments, from coral reefs to deep-sea habitats. Changes in these abiotic factors, often due to climate change, can have significant impacts on marine ecosystems.