Most people come here to Yap in
the middle of the Pacific
Ocean, to dive on beautiful coral reefs and meet the manta
rays, I noticed that 90% of the
island is covered in these beautiful lush mangrove
forests, so I got special
permission from the chief of
Baychel Village to explore the
mangroves. Hi, I’m Jonathan Bird and
welcome to my world! ( ♪ music ) Mangroves are a type of plant
living in the tidal coastal
areas between sea and land. All share the trait of being
able to tolerate partial
submersion in salt water, and
poor oxygen content in the ground
where their roots penetrate.
Mangroves only grow in the
tropics like these rich mangrove
forests in Yap. Mangroves are extremely
important for several reasons.
First, they serve as a buffer
zone between the ocean and the
shore. Their roots hold the
shoreline together, limiting
erosion and attenuating the waves. In
effect, they form a protective
barrier between the ocean and the land. Second, and perhaps more
importantly, mangroves serve as
a refuge for marine life. The
tangled maze of roots in the mangrove
forest creates a confusing
shallow water labyrinth. Taking refuge in this protective maze,
many animals survive here when
they couldn’t survive anywhere else. The mangrove is
a nursery for juvenile fish and
invertebrates. In the protection of the calm sheltered waters of
the mangroves away from
predators, the juvenile fish
find food and safety. Without the
mangrove nursery, life on the
reefs would be in trouble. Mangroves live in salt water,
which is a tough environment
for a plant. The roots are
designed to soak up the water and
exclude as much salt as
possible in the process. They
have little filters built into their cells.
But the plants still take in a
fair amount of salt and they have to get rid of it or it
will kill the tree. They get
rid of it by concentrating it in their leaves. Some
mangrove trees excrete the salt
out through the leaf as a
crystal, which is then washed away by
rain. You can taste the salt on the
leaves. Mmm! Other trees concentrate the
salt in older leaves, which
then turn yellow and fall off, taking the salt with them. All those leaves land in the
water, sink to the bottom and
decompose. The mud has a high concentration of bacteria to
break down all the organic
material. These bubbles on the bottom are
mostly methane—the by-product
of decomposition. The bacteria consume the
leaves, releasing nutrients
that wash out to sea every day
on the receding tide. So the mangroves are an
important food and nutrient
source for animals and plants on the reefs and in the open ocean. Most trees have their roots
completely underground.
Mangrove trees have their roots
coming up out of the water into the air
like this. That’s because the
soil down below the water here is a black muck that’s high in
bacteria and has very little
oxygen in it so the roots can’t absorb any oxygen. So
when they come up into the air,
they absorb the oxygen directly through their skin. Partially submerged conditions
in mangrove forests make it
hard for traditional seeds to take root, so reproduction
requires special seeds. This is a mangrove seed. The
seed part is up here but it has
a long root already on it. When it falls off the tree,
it floats like a cork with this
part up and this part down. When it floats into
shallow water, this part will
go right into the soft bottom
and the leaves will come out the
top and you have an instant
mangrove tree, ready to start
growing. This adaptation allows a seed
to take root in shallow water
with the root in the bottom and the leaves at the surface. Exploring the mangroves, I
realize not only how
fascinating this habitat is,
but important as well. It is imperative that
as coastal development
continues, care is taken not to overlook the importance and
beauty of the mangrove forests,
the nurseries of the reefs. They’re not just part of the
land, or part of the ocean but
a critically important link between these two worlds. ( ♪ music )

58 thoughts on “Mangrove Forests | JONATHAN BIRD’S BLUE WORLD

  1. Amazing Re-Upload! It's funny because I was just watching the original yesterday, and was wondering if you'd do it again in HD!

  2. Great re-upload!!! I remember watching this episode a while back and now I remember how good it is! Awesome video!!!

  3. Olá presados Jonathan e Equipe ,Parabéns ! Os Vídeos de Vocês são Excelentes nota 10, Obrigado por nos mostrar lugares que de outra forma nunca veria-mos, gostaria de ver Vídeos traduzidos para o Português do Brasil. Fiquem com Deus. Salmos 19:1-4 .FORTE ABRAÇO

  4. Hello Jonathan, I don't know if you remember me, but a couple years ago I told you I wanted to get scuba certified. But, to get to the point… Don't lemon sharks live in mangroves? And you should totally do a video on coral reefs, like the great barrier reef! And, don't listen to the haters, they are just jealous that you're smart and they aren't! ??

  5. Hi Jonathan, im going to do a presentation on sharks and i was wondering if you have any tips
    i've already put What Sharks Are, Different Types Of Sharks, Facts About The Goblin Shark, Thresher Shark Facts, How Comman Shark Attacks Are, 20 things that kill humans more then sharks every year, How to tell if a shark is male or female and a spot the difference game to see how well they can see the differecne between a male and a female shark with facts about every shark in the picture so if you have any tips or suggestions please tell me it would really help

  6. Soon 200,000! Good luck on your road Jonathan!
    Also Im from Norway and I love your videos!
    And will you ever do a Diving video in norway do you think?

  7. Very educational. Keep up the good work. Hope you can visit Philippines too, we have a lot of amazing wildlife here including the Tubattaha reef.

  8. In my place mangrove forest is not a place that we dare to go because of the dangerous animal there such as crocodile and snake. You could get attack from nowhere. But today I learn something new and the importance of mangrove plants.

  9. I think only the Red Mangrove has such seed that develops a stem while on the plant. Some other species of mangroves (different genus) grow slightly more inland.

  10. Very interesting the adaptations of mangrove trees, in particular how they deal with the salinity of the water.

  11. AURAPHIL thanks for sharing. For more info, kindly  Google:  Mangroves of CAGAUT River, Salcedo, Eastern Samar or Yolanda Movie (effects of Supertyphoon Haiyan on Mangroves).

  12. Come once to India and please visit Lakshadweep… India's Coral Islands… Mangroves in Sundarban Delta is amazing and world famous too…

  13. I went from "AAAAAH, don't lick the leave!" to "He's gonna lick it, isn't he?" to "Ah, yes. He licked it. What an oddball. <3" in like a second. xD

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