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COASTAL ECOSYSTEMS MANGROVES - BIOL 202 MARINE BOTANYFALL 2009


What are Mangroves?. Mangue (Portuguese)---?Grove----?Woody trees or shrubs found at the sea/land interface in tropical estuaries.3 types: 1) Riverine; 2) Tide-dominated; and 3) Basin Mangroves. MANGROVE WETLANDS. Mostly dicots

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COASTAL ECOSYSTEMS MANGROVES

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Coastal ecosystems mangroves l.jpg

COASTAL ECOSYSTEMS MANGROVES

BIOL 202 MARINE BOTANY

FALL 2009


What are mangroves l.jpg

What are Mangroves?

  • Mangue (Portuguese)---?

  • Grove----?

  • Woody trees or shrubs found at the sea/land interface in tropical estuaries.

  • 3 types: 1) Riverine; 2) Tide-dominated; and 3) Basin Mangroves


Mangrove wetlands l.jpg

MANGROVE WETLANDS

  • Mostly dicots—Myrtales and Rhizophorales (representing about 50% of the species)

    Families: Avicenniaceae, Rhizophoraceae, Combretaceae, Sonneratiaceae.

    Palmae- One monocot Nypafruticans


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SPECIES OF MANGROVES-60 species worldwide

Black Mangrove

Red Mangrove

Viviparous

propagule

Sweet Mangrove

White Mangrove


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ORIGIN OF MANGROVES

  • Indo-Malayan region.

  • Spread westward by ocean currents during the Late Cretaceous and Lower Miocene.

  • Seeds and propagules.


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Characteristics of Mangroves

  • Evergreen plants with thick leathery leaves designed to minimize transpiration.

  • Viviparous germination where the seed germinates on the tree and falls down in the germinating condition with a long radicle- characteristic of Rhizophoraceae .

  • Root system has many unique types of roots. 1. Stilt-roots, 2. Pneumatophores, 3. Root knees. 4. Plank Roots


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ROOTS

  • STILT ROOTS--looping roots arise from the trunk and lower branches

  • PNEUMATOPHORES-Erect roots that are extensions of the underground root system. These roots are exposed at least part of the day and not submerged underwater, the root system can obtain oxygen in an otherwise anaerobic substrate.


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ROOTS

  • KNEED ROOTS-thehorizontal roots growing vertically upwards and forming loops downwards to resemble a bent knee.

  • PLANK ROOTS-wavy, snake-like roots that radiate outwards from the trunk base.


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Lenticels

  • Lenticels—small pores present on aerial roots.

  • Lenticels are susceptible to clogging by crude oil and other pollutants, and attacks by parasites.


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Do Mangroves need salt?

  • Facultative halophytes

  • Grow in fresh water + salt water.


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COPING WITH SALT

  • Exclude Salt (no intake)

  • Extrude salt (take salt in and dispense it through glands in their leaves).


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IMPORTANCE--ECOLOGICAL

  • Habitats, nurseries, and nesting sites.

  • Root systems –harbor many organisms that trap and cycle nutrients and other chemicals.

  • Contribute to higher water quality.

  • Protect shorelines from erosion.


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IMPORTANCE --ECONOMIC

  • Food--- edible fruits and honey from flowers of some species. River mangrove—source of best honey.

  • Medicines- Treatment of skin disorders and sores including leprosy. Headaches, rheumatism, snakebites, boils, ulcers, diarrhea, and many more conditions are traditionally treated with mangrove plants.

  • Hard wood -- used for boat building and cabinet timber.


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WHAT ARE SOME OF THE THREATS TO MANGROVEECOSYSTEM?WHAT ARE THE CONSEQUENCES OF MANGROVE DEFORESTATION?

For Wednesday, October 31. Six students will be selected randomly, and asked to give a presentation (informally) on “Threats to Mangrove Ecosystem with reference to a particular country, and management plan to save mangrove forests.”


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QUESTIONS

  • Where did mangroves originate? How did they migrate to other places in the world?

  • What is vivipary? What is its advantages?

  • What are the different adaptations of mangroves to prevent excessive transpiration?

  • The root system has many unique types of roots in mangroves. Describe the various types of aerial roots found in mangroves.

  • How do mangroves cope with salts?

  • What are facultative halophytes?

  • What are lenticels?

  • Describe the ecological importance of mangroves.

  • How are mangroves useful to humans? List at least three uses.

  • What are some of the threats to mangroves? What are the consequences of mangrove deforestation?


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References

  • http://www.floridaplants.com/mangrove.htm

  • http://www.leecounty.com/DCD/Environmental/Mangroves.htm