^I think they would be very effective in a FOWLR. Provided they recieve ample lighting and there aren't any fish species that will bother the roots too much.
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aquamanpc24... Please let us know how well the white mangroves do in a more aquatic environment. In nature white mangroves are more terrestrial plants, while they are occasionally semi-aquatic, in general, they are the furthest of the 3 common mangrove plants from the water... usually above the high-tide line. I'm sure they could tolerate the more aquatic conditions of a marine aquaria, but I'm curious as to how well they grow in comparison to the red and black mangroves. Can you tell us more about your method for germinating and growing the white mangrove seeds!
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I've studing mangroves quite a bit. Although, I only have 20 or so red mangroves and 10 or so black mangroves that I keep now. I'd love to set up a marine mangrove biotope some day in a terrarium/aquarium tank mimicing the placement of the 3 interworking mangrove species. Here is some information I can provide about mangroves off the top of my head...
Red mangroves (Rhizophora mangle) are closest to the water... often in the water. Black mangroves (Avicennia germinans) are the next furthest inland. White mangroves (Laguncularia racemosa) generally are the furthest inland.
I think some of the keys to growing mangroves in captivity are...
Strong light in the 6,500k-10,000k range. Warm air and water temperature 70-90 degrees. Stable salinity (though they are very tolerant of changing salinity). Minimal disturbance of the root systems (while they are still becoming established). A system with ample nutrients (nitrogen, phosphorous). Washing the leaves of mangroves with fresh water (black and white mangroves very frequently).
Red mangroves significantly limit the ammount of salt entering the plant by producing suberin, a waxy substance which allows the roots to be nearly impermeable to salts.
Black and White mangroves secrete salts absorbed by the roots via 'salt glands' at the base of each leaf. These secreted salt crystals are then rinsed off the plant by rain.
I'm sure I could write more, but I'll leave it at that for now. Glad to know there are other folks enthusiastic about mangroves. I'm into botany and marine aquaria so mangroves are a way for me to bridge the two passions.