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the observer
effect
O
ne universally accepted principle in the study of
physics is the observer effect, which acknowledges
that the very act of observation alters the
phenomenon being observed. This fundamental
law exists in the underwater world as well, and it
is man himself who effects the change.
When you dive into the alien world of the ocean,
your simplest actions — regardless of your intent —
and your very presence, by the nature of your physical size,
equipment, movements and sudden appearance, have an
effect upon the environment’s natural inhabitants.
Like it or not, human presence in the ocean is intrusive.
The life forms there face consequences from humans’
clumsiness or carelessness as well as from their purposeful
actions. This not a judgment that requires the assignation
of good, bad or neutral designations; it is a fact. Actions
cause reactions. In addition to obvious activities such as
tropical fish and shell collecting, spearfishing, underwater
photography, and the feeding or attracting of particular
species, human engagement with marine ecosystems brings
about effects that are direct results of human presence.
These effects range from the relatively minor
(disturbance or temporary displacement) to the more
blatant (the interruption of feeding or mating) to the
indefensible (harassment, injury or provocation of a
creature’s fight-or-flight response). The most serious
repercussions include fatal outcomes for sea life. Scuba
divers who are caught up in the strange beauty and
complexity of a reef environment may fail to ponder how
the inhabitants of that reef react to their presence.
A n I l l u s t r a t e d E s s a y b y D o u g l a s D a v i d S e i f e r t
