Shortly after we moved to the island I became known as The Greenie; this was not a complimentary endearment! I drove the excavator crazy. Of two trees growing side by side, their trunks touching, the excavator was only allowed to remove the one infested with white ants. I bailed up the chainsaw guy & sent him packing. He protested he was only cutting down dead trees. I pointed out nests. We kept our ironbarks ~ & the she oaks, the soap trees & ferns. In between we planted more natives & some exotics. I think we are the only family that has not systematically removed our mangroves, legally or otherwise. I'm sure this does not surprise you. Different root systems but each eliminates the salts while absorbing oxygen, nutrients & water.
A mangrove is not, a mangrove is a mangrove is a mangrove. Queensland alone boasts 39 different species of mangrove. If I walk along my waterfront I can count a least 7 different varieties. On the outer edges we get the common great spreading Grey whose branches rest so serenely along the water like a languid lover's arms & behind those the River mangrove & Yellow. Closer to the shoreline you will find the Milky mangrove, the Red & Orange & Black mangroves, each doing its mangrovey thing, each different, each special.
It's been estimated that at least 1/2 of the world's mangrove forests have been destroyed by man. That's insane when you consider they stabilise river banks & channels & act as buffering from storm surges & winds. This was devastatingly highlighted during the Sri Lanka Tsunami of 2005. The village that had removed all its mangroves suffered over 6, 000 deaths. The one that kept them just 2! [quote from here] Seventy~five % of tropical coastlines are bordered by mangroves. They provide breeding nurseries for loads of marine life, shelter & nesting habitat for scores of birds & are soil formers.
The Grey Mangrove, with its wide spread & drab colouring, is absolutely fascinating. It is the pioneer mangrove, growing at the farthest extremes of the mangrove forest, tolerating short periods of both freshwater & hypersalinity & colonising developing mudbanks.
Between the pioneer spirit of the Greys & the landhuggers like the Blacks you find stands of River Mangroves. They look, to me, a lot like more of the same but they are subtlety different & do a quite different job. They form large stands in the centre & landward zones of mangrove forests creating an understory for the Greys & buffering the less robust mangroves behind them.
And did you know that Mangroves can "drown"? More or less. Extended periods of water logging exceeding 14 days & any species of mangrove will die. They all need a certain amount of exposure to fresh air to disperse their salts & oxygenate themselves.
We are blessed, Along our stretch of beach the mangroves have been left unmolested for many years. We have several huge trees bearing the scars of the storms they have survived, wide swathes where it is possible to walk through dappled waterlight with ease. When the winter winds howl overhead & the thermometer plummets I can head into the mangroves knowing that in some sunshiny spot there will be silence & warmth & shelter from the storm.