Flow
map of red tide in Florida (credit to Start1)
Term
of “red tide” refers to blooming of algae in the oceans. It is
due to nutrients from ocean floor rising to the surface.
Nutrients
are excellent source of foods for different kinds of algae. Some
algae are harmful, others are not.
It
is natural phenomena, and could be happen any where in the world. The
time length of red tide is about two weeks.
Harmful
algae called Karenia
brevis,
could color ocean surface to be red if they are in great number or
dense enough in the water.
In
the coast of Florida, this algae is appearing from Spring to Summer,
and blooming in the November every year.
The
longest red tide in Florida in recent years was about 16 months, from
around late 2017 persist to early 2019.
Dead
of marine animal due to Florida red tide
(credit
to Ivy Yin)
The
Karenia
brevis
released neurotoxin, the effects of this toxic
on environments are following:
-
killing and contaminating wildlife such as fish, shellfish, birds,
dolphin and sea turtles.
-
breathing problems to human
Fishes
are sensitive to
neurotoxin. Commercial fishes which are salmon, cod, flounder,
American pollock and Atlantic herring could die in an hour after
exposure to neurotoxin.
This
16 months red tide caused lost million of dollars to Florida state
economic, especially to business relate to tourism industries.
Have
you seen red colors of sea in front of any beaches?