The mangrove forests are unique
ecosystem that are found along the estuaries and coastal mudflats. The mangrove ecosystems perform several functions such as inundation
control, protection from erosion, storm, floods and tidal damage, and generate
goods and products such as fish and forest resources. These functions are of
fundamental importance for society.
The
high productivity of mangrove ecosystems means that they provide ample food
supplies to maintain a complex food chain. They are therefore providing fertile
habitats and spawning/nursery grounds for many species of commercial
importance, including shellfish and fish.
Mangroves forests are important habitat to many
species of flora and fauna. The major tree
species found in mangroves forest are Rhizophora mucronata (Bakau kurap), Rhizophora apiculata (Bakau minyak), Bruguiera parviflora (Lenggadai), Bruguiera cylindrica (Berus), Xylocarpus granatum (Nyireh bunga), Xylocarpus moluccensis (Nyireh batu), Ceriops tagal (Tengar) etc. It is also an important sustainable source for
charcoal, wood piles (poles) and firewood. The species that are used for
charcoal production are Bakau minyak (Rhizophora
apiculata) and Bakau kurap (Rhizophora
mucronata).
In Peninsular Malaysia, the mangrove forests are
more abundant in the west coast compared to the east coast. The mangrove
forests are found in Kuala Kedah (Kedah), Matang (Perak), Klang (Selangor),
Sungai Johor (Johore) and in several places in Malacca, Negeri Sembilan and
Penang. On the east coast it is found along the coast of Kuala Sedili and
Sungai Pulai, Johore and Kuantan river in
Pahang. In Sabah, the mangrove forests are mainly found on the east coast. Meanwhile,
in Sarawak, most of the mangrove forests are situated along the east coast and
Rajang estuary.
MAJOR ROLES OF MANGROVE ECOSYSTEMS
Some important
roles of mangrove ecosystems are briefly highlighted and discussed as follows:
Coastal Protection, Flood Control and Water Quality
The benefits to local
coastal communities from conserved mangrove ecosystems are enormous. Among several functions, they help coastal communities by reducing coastal erosion,
flooding, and storm surge; dampening waves and high winds
generated by tropical and
subtropical storms; and perhaps lessening the ravages of tidal waves (Tsunamis)
in or near seismically active areas. In terms of water quality control,
mangrove forests protect water quality in areas affected by tides, which is the
end of a river system. They provide the filtering systems and
settling basins for silt brought down rivers and are the sites where salt water
mixes with fresh water.
Mangroves Forest as Carbon sink
This area is increasingly
important to serve as a carbon sink and absorbing air and water pollution.
Carbon stock is the amount of carbon stored in forest ecosystems, especially
plant biomass and soil carbon content. Carbon used by plants in photosynthesis
process and assist in the growth process. If the carbon released into the air,
they will contribute to global warming and climate change. For example, Avicennia, Sonneratia, Rhizophora
and Bruguiera have high carbon sequestration rate. The matured
tree of Rhizophora
apiculata, Brugeiera parviflora, Avecenia alba and Sonneratia caseolaris content 210 t/ha, 55.8 t/ha, 51 t/ha and 49.2 t/ha of biomass
respectively.
Source
of Commercial Wood
Rhizophora mucronata (Bakau kurap) and Rhizophora apiculata (Bakau minyak) are
two dominant species of highly commercial value. Charcoal industry and harvesting of wood and poles are
important sector in this country. For example, at present there are about 60 kilns
that has been built and operated in Kuala Sepetang, Matang Mangroves Forest,
Perak. This industry also provides employment opportunities
for local people. Charcoal are consumed domestically and exported to foreign countries.
Activities of Marine Fisheries and Livestock
This mangrove forests
provides spawning grounds and nurseries for numerous commercially valuable as
well as shelter for a variety of
marine life species such as
shrimp, crabs, fishes and oysters. Moreover, mangroves export nutrients and
organic detritus, which form the base of a complex food web supporting
estuarine, coastal, and some offshore fisheries.
Development
of Eco-tourism and Recreation
Education
and Research Site For Mangroves
Forest
Education sites established in mangrove forests offer students and researchers
to more easily access to study the ecology, habitat and plants as well as
diversity of terrestrial fauna. In addition, activities such as scientific expedition
and studies by government agencies, non-governmental organization (NGO) and
institutions of higher learning are encouraging.
Ecosystems
and Biological Conservation
Traditionally,
mangroves and other tropical wetlands have not been considered particularly
rich in species, especially in comparison to the extremely high biodiversity
found in coral reefs and rainforests (Saenger et al.,1983). In conservation
terms however, this view is counter-balanced by the extremely high abundance
and productivity of certain wetland plant and animal species. These
characteristics of mangroves make them important for other wildlife,
specifically:
-as dry season refugia and subsequently as
sources for re-colonisation of surrounding habitats,
-as feeding grounds for resident and
migrant wildlife,
-as breeding and nursery grounds,
-as a link between terrestrial and marine
ecosystems.
Beside more than 50 species of
flora, there are also abundant fauna species such as mammals (12 family), birds (39 family) and
marine life (61 family).
The abundance of wildlife probably attracted
early natural history enthusiasts (and hunters) to the estuaries, islands and
lagoons habitually used by nesting and over-wintering waterfowl. Consequently,
the significance of mangroves and associated habitats is much better
appreciated for birds than any other group of wildlife, and a number of
conservation initiatives have focused on their protection.
There are endangered
species associated with mangroves include the milky stork and less adjutant
stork, while mangrove mudflats serve as feeding areas for huge numbers of
migratory waterbirds, including rare species (Silvius, 1987). In Peninsular
Malaysia, the the tidal flats of Kuala Gula wildlife reserve, Perak provides a wintering site for millions of shorebirds
every year.
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