Mangroves | Redland City Council

Mangroves are a common coastal habitat throughout Moreton Bay and eight species have been recorded here. They can be found all along the mainland, on the islands of Moreton Bay and besides on the western side of North Stradbroke Island .
Grey mangrove in the Redlands
arsenic well as playing a full of life function in stabilising and protecting coastal areas, they besides provide habitat for a wide-eyed rate of species, some of which occur only in the mangroves .

Mangroves of Redlands Coast

The most common types of mangrove plants in the Redlands Coast are :

  • Mangrove fern (Acrostichum speciosum)
  • Grey mangrove (Avicennia marina)
  • River mangrove (Aegiceras corniculatum)
  • Orange mangrove (Bruguiera gymnorhiza)
  • Yellow mangrove (Ceriops tagal)
  • Blind-your-eye mangrove (Excoecaria agallocha)
  • Black mangrove (Lumnitzera racemosa) – this species is very rare
  • Red mangrove (Rhizophora stylosa).

Saltmarshes and mangroves

Mangrove adaptations to their environment

Mangroves have had to physically adapt their leaves, their roots and their generative methods in orderliness to survive in a harsh, active environment of indulgent, low oxygen soils and varying brininess .

Leaf adaptations to saline conditions

many mangrove species, such as the Grey Mangrove and the River Mangrove ( common species along the Redlands Coast ), have leaves with glands that excrete salt .
Some species such as the Grey Mangrove can besides tolerate the repositing of large amounts of salt in their leaves – which are discarded when the salt cargo is besides high .
Mangroves can besides restrict the open of their stoma ( these are humble pores through which carbon paper dioxide and water vapour are exchanged during photosynthesis ). This allows the mangrove to conserve its fresh water, which is an ability that is vital to its survival in a saline solution environment .
Mangroves are able to turn their leaves to reduce the surface area of the leaf exposed to the hot sun. This enables them to reduce urine loss through dehydration.

Root adaptations to soft, saline, low oxygen soils

A distinctive feature of mangroves is their far-reaching, expose roots. While these roots come in many different shapes and sizes, they all perform an crucial function – structural digest in the delicate soils .
Some species of mangroves have pneumataphores, which are above-ground roots. These are filled with spongy tissue and peppered with humble holes that offer geomorphologic documentation and allow oxygen to be transferred to the roots trapped below labor in the anaerobic ( depleted oxygen ) soils .
The roots of many mangrove species are besides adapted to stop the consumption of a distribute of the strategic arms limitation talks from the water before it reaches the plant .
Redlands mangroves - Pneumatophores

Reproductive adaptations to tidal environment

Some mangrove species have evolved to produce seeds that float. The tide acts as the method acting of dispersion to avoid crowding of unseasoned plants.

other mangrove species are viviparous. They retain their seeds until after it has germinated and a farseeing, cylindrical propagule has formed. When it has matured to this phase, the parent tree drops it into the water, where it remains abeyant until it finds the soil and is able to put out roots .

Mangrove Odours

If you live nearby mangrove wetlands you may notice a impregnable rotten egg odour peculiarly between May and November. While often mistaken for sewage, it is actually the consequence of a natural process when mangroves drop seeds which begin to be broken down by bacteria living in the land .
Mangrove odours on Redlands Coast Fact Sheet [ PDF 1.25MB ]

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