No population fluctuates as much as 90% naturally, especially in such a stable environment as the deep-sea. Any changes made to halt these population declines would not be evident for several generations?approximately 100 years.
The declines occurred on a timescale equal to, or slightly less than, a single generation of these species.
Species declines change predator-prey dynamics, energy flow through systems, and ecosystem resilience, stability, function, and form.