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Mangroves

NOAA. Mangroves. By Dave Cabrera. Introduction. Mangroves – Halophytic (salt tolerant) trees that live in areas predominantly saturated with salt water Found along coastlines between 32 degrees N and 38 degrees S. 16-24 families and 54-75 species (classification dependent)

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Mangroves

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  1. NOAA Mangroves By Dave Cabrera

  2. Introduction • Mangroves – Halophytic (salt tolerant) trees that live in areas predominantly saturated with salt water • Found along coastlines between 32 degrees N and 38 degrees S. • 16-24 families and 54-75 species (classification dependent) • Highest diversity in Asia • New world has 12 • US has 4 (species we will discuss) • 25% of Caribbean coastline • 75% of continental regions

  3. Adaptations to Salt Water • Salt pores – located on leaves, root and branches. Excess salt absorbed from soil secreted • Salt exclusion – roots of some mangroves exclude salt • Viviparity – seeds germinate while attached. Fully developed seedlings drop from tree.

  4. Prop roots Odyssey Expeditions Pneumatophors Lenticels NOAA Adaptations to Low Oxygen in Soil • Prop Roots – roots exposed to air (red mangroves) • Pneumatophors – pencil-like roots that stick up from the substrate (black mangroves) • Lenticels – slits in the bark and roots • Aerenchyma – air spaces that allow gas to reach underground roots

  5. NOAA Role of Mangrove Ecosystem • Mangroves as a Buffer • Protects coastline from wave action • Prevent erosion, and keep sediments from reaching coral reefs • Collect and stabilize sediments

  6. Role of Mangrove Ecosystem • It has been highly debated as to whether succession occurs in mangroves. The evidence is inconclusive as to whether this happens and is considered hypothetical.

  7. Odyssey Expeditions NOAA Role of the Mangrove Ecosystem • Mangroves as a nursery and a habitat • Detritus from leaves – Bacteria feed off detritus • Bacteria – provide food for planktonic organisms • Plankton – Serve as food for larval and juvenile fish and invertebrates • Shelter – protection from predators

  8. Odyssey Expeditions NOAA Odyssey Expeditions Roll of mangrove ecosystem • Diversity of species in mangroves • Trees – 54-75 species in 16-24 families • Poriferans – sponges grow on prop roots • Annelids – segmented worms live in mud and among prop roots • Cnidarians – anemones occupy prop roots • Molluscs – Gastropods (periwinkles) and bivalve (oysters) found on prop roots • Echinoderms – Sea cucumbers, sea stars • Urochordates – tunicates attach to roots • Birds – use tree tops • Fish – swim among roots • To name a few

  9. NOAA Odyssey Expeditions Species of Mangroves • Red Mangrove (Rhizophora mangle) • Location – found nearest to water • Leaves elliptical and leathery. Dark green on top, pale green underneath • Prop roots – large aerial roots extend from tree into ground • Roots submerged • Tolerant of low oxygen

  10. Red Mangrove Dispersal • Seedling dropped from tree • Floats root down in water • When it comes in contact with substrate it takes root and grows • Can float around for over a year

  11. Red Mangrove Dispersal

  12. NOAA NOAA Species of Mangroves • Black Mangrove (Avicennia germinans) • Location – Shoreward of red mangroves • Leaves – Oblong. Dark green on top, pale grey to white underneath. Often encrusted with salt. • Pneumatophores – Pencil-like root extensions that provide surface area for gas exchange • Roots submerged only at high tide • Tolerant of low oxygen

  13. NOAA NOAA Species of Mangroves • White Mangrove (laguncularia racemosa) • Location – Terrestrial side of mangrove stands. Behind black mangroves. • Leaves – Broad flattened and oval. Leaves branch out from stem opposite to each other • Salt Pores – Present at base of leaves • Soil fully saturated with water • Tolerant of salty soils • Less tolerant of high water

  14. NOAA NOAA Species of Mangroves • Buttonwood (Conocarpus erectus) • Location – Terrestrial side of mangrove stands, behind black mangroves. Not a true mangrove • Leaves – Elliptical and leathery. Dark green on top, pale green underneath • Salt Pores – Present at base of leaves • Soil is damp, but not saturated • Tolerant of salty soils • Not tolerant of high water

  15. Shrimp and development Rice Threats to Mangrove Ecosystem • Deforestation • Coastal development • Shrimp farming • Flooding • Charcoal and timber industry

  16. Oil NOAA Threats to Mangrove Ecosystem • Pollution • Point source pollution – sewers, industrial discharge, oil spills • Non-point source pollution – agriculture runoff

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