Man vs. Mangrove

22 07 2007

In an episode of the Discovery Channel series “Man vs. Wild,” Bear Grylls encounters the challenges of mangrove in Costa Rica…

Mangrove Removal Efforts: He’eia, Hawaii

21 07 2007


He’eia fishpond is the second largest remaining fishpond of its kind on the windward side of the island of O’ahu in Hawaii. It is owned by Kamehameha Schools and managed by an organization called Pae Pae O He’eia. Mangrove has become a problem in the pond, filling the pond in with anoxic and smothering sediment. Pae Pae O He’eia uses chainsaws and loppers to eradicate the mangrove as much as possible, and is making slow and steady progress with the help of dedicated and hardworking staff and volunteers. Mangrove is just one example of the damage invasive species can do when introduced to foreign lands.


Mangrove in Hawaii

21 07 2007


Because of mangrove’s ability to trap runoff and sediment, two mangrove species (the Red mangrove, Rhizophora mangle, and Oriental mangrove, Bruguiera sexangula) were introduced to Hawai’i in 1902 and 1922 by the Hawaii Sugar Planters Association to help with erosion control. Because mangrove is not native to Hawai’i, it has no natural predators to control its growth. Therefore, the mangrove started to grow uncontrollably and now causes three main problems:

1) Mangrove’s smothering root systems allow it
to out-compete all native Hawaiian plants
2) It fills in coastal regions with sediment, destroying
habitats for native plants and animals
3) The sediment that mangrove accumulates is anoxic
(lacks oxygen) and cannot support life

The Basics…

21 07 2007

What is Mangrove?

Mangroves are species of trees and shrubs that live in coastal or saline environments. There are over 100 different species of mangrove that can be found around the world. Mangroves are known for their intricate root systems, which trap sediment and runoff and even help to dissipate wave energy and provide shelter for nearby land. Mangrove is native to many places and is often times an integral part of local ecosystems as it provides refuge from heavy winds and rough waves for coastal plants and animals.