It has been observed that the
distribution of some chaetognath species is closely linked with environmental
variables (MSIP), thus making them excellent indicators of the health of their
environment. Studying chaetognaths should assist in identifying if these
variables change, if they do change then chaetognaths may be at an elevated risk
of extinction. However, due to their small size, chaetognaths may not be the best
option as an indicator species.
The effects of climate change may
also affect chaetognaths; in particular, it may be assumed that increasing sea
surface temperature (SST) would more likely to have a greater affect on them
than increasing sea level. Sea surface temperature may affect
chaetognaths that have their distribution restricted to colder waters, and
would have less alternative options for suitable habitats. Additionally, increasing SST may affect the vertical distribution of temperatures that fall within an individual's preferred range.