736
A statistically rigorous definition of what constitutes seasonal hypoxia does not currently exist and in fact should be linked to ecological consequences for it to be ecologically relevant and not just connected to absolute concentrations . ( 3 ) Currently coastal marine ecosystems that experience hypoxia for a period of days to months every year are often considered to be seasonally hypoxic , although we have categorized them here as being episodic , because we required the monitoring units to be hypoxic for most of the stratified period .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Anatomy 
Text: {0} 
Answer:
 None