Final answer:
M. marinarum causes a variety of symptoms in marine life, including skin infections and systemic issues, which can sometimes result in death. Similar pathogens have decimated global frog populations by disrupting skin functions which are crucial for their survival.
Step-by-step explanation:
M. marinarum, a marine pathogen, causes a variety of symptoms in fish and amphibians, such as frogs. These symptoms may not always be immediately apparent but can include cutaneous mycoses, which are fungal infections on the skin. In frogs, one well-known fungal pathogen is Batrachochytrium dendrobatidis, contributing to global frog population declines by infecting the skin and disrupting essential gaseous exchange for amphibian survival.
While M. marinarum is not specifically mentioned as causing these effects, marine pathogens similar to it can result in significant harm to aquatic organisms. Infected animals may suffer from skin lesions, abnormal swimming patterns, lethargy, and in more severe cases, systemic infections that lead to mortality. These pathogens can also have indirect effects on humans, particularly if affected marine life is part of the human food chain.