Talk:Mangrove

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Florida Bay[edit]

The list of mangrove tommy envirionments in the main article does not include the Park is mangrove wetland, including nearly ALL of Florida Bay. This area, coupled with the Ten Thousand Islands Soutwest of Everglades City, FL comprise a critical nursery for numerous species, including shrimp & the lemon shark. Other mangrove communities in Florida are located in the lower keys, Along the Banana River near Titusville & the Kennedy Space Center, along the Indian River in Brevard & St. Lucie Counties, Lake Worth in Palm Beach county, The area immediately adjacent to Port Everglades in Fort Lauderdale, along the Calusahatchee River in southwest Florida, Lemon & Sarasota Bays in southwest Florida, the Manatee river near Bradenton, Florida, & Tampa Bay area. —Preceding unsigned comment added by B. Mason (talkcontribs) 22:19, 12 March 2006

Physics[edit]

I do not question that mangroves protect against tsunamis, I just don't quite understand. My imagination can't grasp precisely what happens as a mangrove protects against a tsunami. I just imagine the debris crawling up the road just the way cars and bits of buildings do. Would the additional debris make the wave move slower? I suppose it would absorb some of the energy, and the destruction of those trees would translate into less destruction elsewhere. Would salt marshes and wetlands do the same kind of thing against tsunamis as mangroves? Those, at the very least would be lining a bay instead of housing.

Or, I just thought, would the mangrove help trap the dirt that the tsunami would pull out to sea? I remember a lot of islands were eroded to the point of being more underwater than before on the news. Could mangroves prevent that?

Thanks a bunch

Also, should an explanation for how mangroves protect against tsunamis be put into the article?

I suppose the most important thing has to do with dissipating the energy of the tsunami. The trees are well-anchored, and they are somewhat flexible - so they would absorb a lot of energy before they broke. Stilt-rooted species have the equivalent of a series of guy-wires holding them down, rather than a single trunk - the point at which the fail mechanically is going to be much further along than a normal tree. By bending and absorbing the energy, they reduce the energy of the wave hitting the land. Guettarda 19:02, 8 December 2005 (UTC)


Naming ?[edit]

On the spanish wiki the tree is es:Mangle (interwikilinks was pointing to the laundry machine en:Mangle entry here so I'm fixing that) and the ecosystem formed by many Mangles are called Manglares (and interwiki for es:Manglar was en:Mangrove ). SO I'm confused. I've just traveled to a Manglar past week (took lots of pictures for improving articles) but before I'd like to settle the naming issue to check which one is right. I can confirm that at least in spanish, Mangle is the tree and Manglar the mangle forest. (The entry also mentions the word Mangal for the forest, but that's something I inferred, it's not explicit) -- ( drini's page ) 07:02, 31 December 2005 (UTC)

I think you are correct: mangal is English for the ecosystem (= manglar), while mangle is latin (e.g., Rhizophora mangle, the American or red mangrove tree) for the plant (= mangrove). The confusion being that you have two different languages in your list of terms. In English, the term "mangrove" is used comnmonly for both the tree and the ecosystem (e.g., "mangrove forest") - Marshman 20:14, 2 January 2006 (UTC)

information about the role that plays the algae[edit]

I would like to know any information about the role that plays the algae in the mangrove lifecycle

Disagreement[edit]

I don't quite agree that the storm surge and hurricane protection offered by Mangroves are "very limited" because of this source which states otherwise:

http://www.nationalgeographic.com/wildworld/profiles/terrestrial/nt/nt1406.html

I would also like to see something mentioned as to how the mangroves contribute to the formation of land. Rather than assuming the rivers just erode away and bend, moving the Mangroves location. Of how the presense of Mangrove can actually help to create new land, and even islands, in a process

- Gwaeraurond 21:01, 3 May 2006 (EST)

You won't find much evidence for real "formation of land" by mangroves. Certainly depends on the local conditions (inundation frequency, tidal amplitude, wave action), but there are some studies showing that mangroves appear rather opportunistically where the sediment conditions change in favour their presence, and that they disappear otherwise. The same can be said about the "protection" mangroves offer — well, if human settlements keep away from the water and stay behind undestroyed, large mangrove forest belts, they are less likely to be damaged by waves as could be seen during the tsunami in 2005. However, the mangroves themselves are susceptible to damage by storms. --Ulf Mehlig 2006-07-08 17:19 UTC

confusion[edit]

While the discussion here is all very interesting, the Wikipedia page for 'mangrove' is slightly less so, containing nothing but the statement "Shaelah is the coolest person ever!!!!!" and no edit button.

Being new to Wikipedia and its ways, I don't really know what's going on, but it's pretty clear that all this mangrove-discussion is in no way related to "Shaelah," whoever the hell that is. Shaelah (in vanity), or perhaps an admirer of Shaelah, has obviously sabotaged the mangrove article.

It would be really, really nice if we could get it back.

Sorry if this is in the wrong place.

-- Someone Just as Curious About Mangroves as the Next Person to Look it Up on Wikipedia.

too USA centric[edit]

need more info on other worldwide locations. ive started by adding some bits Anlace 23:28, 21 May 2006 (UTC)

There are tons of mangroves outside the USA. I hope much more info gets added! Pfly 05:12, 22 September 2006 (UTC)


Exactly, this article has a severe geographic bias, e.g inclusion of the genus Fimbristylis as a 'minor component' is a nonsense if mangrove vegetation is treated globally. A Fimbristylis species, for example, lives close, but not in mangrove vegetation in eastern Australia, along with other sedges. Inclusion of such 'saltmarsh' species would add many tens or hundreds of species.

I have added some substantial information on South America but Asia actually dominates the scientific literature so more on Asia the better.

Image:Mangrove.jpg[edit]

Image:Mangrove.jpg does most probably not show R. mangle as the author specifies that the picture was taken in Queensland/Australia. R. mangle does not naturally occur in Australia as far as I know. Ulf Mehlig, 2006-07-07 15:35 UTC

Crabs[edit]

Don't say "Mangrove crabs are important animals in the habitat." Say instead why they are important. Maybe something like "Mangrove crabs improve the nutritional quality of the mangle muds for other bottom feeders by mulching the mangrove leaves." (Skov & Hartnoll 2004). Bejnar 00:50, 13 November 2006 (UTC)

Article deleted![edit]

I discovered that the mangrove page was deleted just a few minutes ago, managed to salvage the contents through the google cached page. I am not familiar with how to format wiki using html. Please help! Thanks

Cached page from google: http://72.14.235.104/search?q=cache:V9LpUAAmY_QJ:en.wikipedia.org/wiki/Mangrove+wikipedia+mangrove&hl=en&ct=clnk&cd=1

Australasia[edit]

Australasia is a term used to describe a region of Oceania: Australia, New Zealand, Papua New Guinea, Sulawesi (the eastern part of Indonesia) and the neighbouring islands in the Pacific Ocean. That is how it is used in this article. Do not change it back to Australia. The area being discussed is bigger than that. --Bejnar 07:16, 25 March 2007 (UTC)

Contradiction between sections[edit]

The third paragraph of the 'General description' section states:

It is often stated that mangroves provide significant value in the coastal zone as a buffer against erosion, storm surge and tsunamis. While there is some attenuation of wave heights and energy as seawater passes through mangrove stands, it must be recognised that these trees typically inhabit areas of coastline where low wave energies are the norm. Therefore their capacity to ameliorate high energy events like storm surge and tsunamis is limited. Their long term impact on rates of erosion is also likely to be limited. Many river channels that wind through mangrove areas are actively eroding stands of mangroves on the outer sides of all the river bends, just as new stands of mangroves are appearing on the inner sides of these same bends where sediment is accreting.

The 'Mangrove ecosystems' subsection states:

Mangroves are excellent buffers between the violent ocean and the fragile coast, especially during hurricanes, which can bring powerful storm surges onto shores. The massive mangrove root system is quite efficient at dissipating wave energy. This same root system also helps prevent coastal erosion. As tidal water flows through the root system, it is slowed substantially enough so that it deposits its sediment as the tide comes in, and the return flow is kept slow as the tide goes out to prevent resuspension of some of the finer particles. As a result, mangroves can build their own environment. Because of the uniqueness of the mangrove ecosystems, they are frequently the object of conservation programs including national Biodiversity Action Plans.

Neither section cites any sources. So, are mangroves "excellent buffers", or they do they provide only "limited" protection against storms and erosion. As I have time I'll try to research this. However, another alternative is to remove both paragraphs if sources are not found. -- Donald Albury 13:37, 27 May 2007 (UTC)

  • Actually, to some extend they are both correct, but the second one is better. The statement "typically inhabit areas of coastline where low wave energies are the norm" is true but there it is the extraordinary waves like "powerful storm surges" that are protected against. Yes, there is fluvial erosion in the mangal, especially on the "outer sides of all the river bends", but this doesn't detract from their overall effectiveness in erosion control. I also will try to find appropriate sources to make this clearer. It sounds like the first paragraph was written by someone who had just come from a lecture where the lecturer was pointing out the exceptions to the generally stated case, and he/she missed the overarching point. --Bejnar 19:16, 27 May 2007 (UTC)
I've requested citations. Actually, there are a number of places in this article that don't cite sources, but I've got enoug to keep track of without plastering this article. If I get a chance I'll search for suitable spurces, but that may be a while. -- Donald Albury 21:03, 27 May 2007 (UTC)
I have provided citations. I was told that there is a good discussion of this in Wolanski, Eric. (2007) "Protective functions of coastal forests and trees against natural hazards" Food and Agricultural Organization (FAO) of the United Nations, Rome, but all I can find is an Abstract. Also there are studies that show that vegetated river banks erode 2 to 3 times slower than unvegetated ones, I will look for a summary article on that to remove the last citation requested in this section. --Bejnar 16:01, 28 May 2007 (UTC)
Since I re-organized these two sections a little, the contradiction between the paragraphs became more obvious. I tried to reconcile the information into two coherent paragraphs. But that text has to be reviewed by someone who knows more about the subject, or at least check all the references. -Pgan002 08:35, 20 June 2007 (UTC)
And sometimes reliable sources contradict each other, and we have to leave it at that. -- Donald Albury 10:53, 20 June 2007 (UTC)

Middle Beach, Australia[edit]

On 27 August 2007, in the "New Guinea and environs" section, an editor inserted "Middle Beach" in the middle of a sentence that was supported by the citation to "Mangrove ecosystems in Australia: structure, function and status". To the best of my knowledge, that citation does not support the insertion. Can anyone provide the page number in the 1995 State of the Marine Environment Report for Australia that discusses the Middle Beach mangroves? Or can someone provide other citation for their existence? I have temporarily deleted Middle Beach from the sentence pending citation. --Bejnar 18:58, 29 August 2007 (UTC)


What on earth is an "aboriginal footprint" when it's at home?[edit]

FTA:

Mangroves are also extremely important to the aboriginal "footprints" that are part of their cultural heritage. The mangroves of North Stradbroke are an excellent example of this phenomena, and this is obvious if you are to visit there. We as humans need the mangroves because, as a race, we depend on the numerous materials found there such as gold and other such lucrative minerals.

If anyone has the faintest idea what this is supposed to mean, please translate it into plain English. If nobody can shed any light on this paragraph, it should probably be removed. 81.86.133.45 12:45, 8 September 2007 (UTC)

That was a weird sentence in the article - removed now - Peripitus (Talk) 23:56, 8 September 2007 (UTC)

Errors of fact and emphasis[edit]

Errors of fact and emphasis are rife in this article. It badly needs informed work. Gmelina (talk) 02:29, 25 May 2008 (UTC)

Meaningless/garbaged text[edit]

"This increasing to population of the poisions blue green algae." makes no sense. Will somebody please fix that text?

Nomination[edit]

This should be nominated for Featured Article when all the gibberish text is fixed. 71.214.241.113 (talk) 05:18, 25 October 2008 (UTC)

Biome template[edit]

My own thinking is that the sidebar Template:Biome is too long and doesn't add that much to the article. I would remove it or replace it with a bottom template, or a collapsed version of the sidebar. --Bejnar (talk) 22:35, 4 June 2009 (UTC)

Seawater[edit]

On 16 July 2009, Richard New Forest changed the lead from shrubs that grow in saline (brackish) coastal habitats to shrubs that grow in saline coastal habitats (both seawater and brackish water). I removed the change with a citation to the scientific literature that indicates that mangroves do not grow in seawater (now FN#1). Richard New Forest restored the word "seawater", retained the citation and said: Yes, but leave option for both open. Tidy lead elsewhere. Straight seawater will not support mangroves (Rhizophora) or mangel. Only a few plants can tolerate straight seawater. It is the nature or mangroves to utilize brackish water, often from near-surface groundwater sources. It complicates the lead to say seawater and it isn't correct. The abstract of the cited article is at "Mangrove trees growing in a very saline condition but not using seawater") and there is other literature on point. I agree that it is a good thing to link "brackish" as brackish water in the lead. --Bejnar (talk) 21:04, 17 July 2009 (UTC)

Following copied from User talk:Richard New Forest:

I do not understand your comment at Mangrove: Yes, but leave option for both open. Tidy lead elsewhere. Straight seawater will not support mangroves (Rhizophora) or mangel. Only a few plants can tolerate straight seawater. It is the nature or mangroves to utilize brackish water, often from near-surface groundwater sources. It complicates the lead to say seawater and it isn't correct. Take a look at the cited article (or at least the abstract at "Mangrove trees growing in a very saline condition but not using seawater") and other literature. -- Bejnar (talk) 20:52, 17 July 2009 (UTC)

My understanding was that mangrove swamp is often brackish, but that some species can tolerate seawater or even considerably higher salinity where evaporation concentrates the seawater. (I remember reading a paper on this, but can't now remember where, nor what species were involved.) Also, doesn't mangrove swamp often form vegetation along coasts outside estuaries, where there is no fresh water at all? The areas where no mangroves grow are on the upper mangrove, where the same seawater is exposed over long periods to evaporation, making it much more saline than seawater.
In fact quite a few flowering species can live in pure seawater – I'm not familiar with mangrove swamp, but I am with saltmarsh, and could show you square miles of saltmarsh in UK estuaries with no or very little fresh water dilution. Such saltmarsh often has a couple of dozen flowering plants. (Not forgetting of course really highly adapted saltwater plants such as Salicornia and seagrass, which can live under seawater much or all of the time.) Of course with our high rainfall and cool climate we don't get hypersaline upper edges to saltmarsh.
That abstract you link does not in fact say that the plants can't tolerate seawater. What it is actually saying is that some of the saline water in this particular case is not derived directly from seawater, but from fresh water which has dissolved previously dried salt. It does not say in the abstract how saline this actually is – but the "in a very saline condition" in the title does imply not very brackish... It also talks of one species living "on the seafront", implying that this is living in pure seawater or close to it. (A similar thing happens in a few places in the UK, where saltmarsh vegetation occurs many miles inland, near springs of saline water derived from fresh groundwater dissolving rock salt.)
I do agree though that my edit may not have made the para as clear as it might have... I think the article overall needs a bit of work. Richard New Forest (talk) 21:52, 17 July 2009 (UTC)

Once upon a time, it was thought that mangroves grew in straight seawater, primarily because the water beneath them connected directly with the sea. Testing has proved that this is not so. Freshwater, primarily groundwater seepage from the land side, dilutes the seawater at the edge of land, reducing the soil water's salinity and allowing the mangroves to survive. --Bejnar (talk) 16:13, 18 July 2009 (UTC)

If you're talking about the ref you gave, that is not what it is saying. Have a look at these:
  • [1]: "certain mangrove species can tolerate soils more than double the salinity of ocean water"
  • [2]: " Avicenna (black mangrove) ... Can tolerate very high salinity (60 ppt)" (seawater is 30 to 40 ppt); "Rhizophora [found in salinity] to 39 ppt"
  • [3]: "Mangroves are found where salinity ranges from 0-90 ppt."; "In restricted bays and flats water salinities often range over 40ppt."
  • [4]: Research which grew seeds of four mangrove species in seawater and brackish water of various dilutions. Results were different for different species, but for one species: "Performances of all the aspects of R. mucronata under the different saline conditions [including 100% seawater] were not significantly different".
Seems pretty conclusive to me. It seems that my edit of the lead was indeed wrong, but in the other direction: I ought to have said they can live in water of over twice the salinity of seawater. Richard New Forest (talk) 16:56, 18 July 2009 (UTC)
I've edited the lead to incorporate this, with two of these refs (one of which was already reffed several times in the article...), and removing the ground-water ref, which (though interesting) is not relevant here. Richard New Forest (talk) 13:30, 20 July 2009 (UTC)

map[edit]

Could the article benefit from a world distribution map, such as

File:World map mangrove distribution.png
World map mangrove distribution --> Map full of error to not use

present in the french mangrove article?--Annielogue (talk) 16:59, 16 November 2010 (UTC)

I just removed this map full of errors from all the languages I could. I contacted its author to know the sources he used to make it, but no answer since a year. I replaced it by this one that is correct and based on scientific work.

World map mangrove distribution --> Map to use as based on scientific work

--Ndiverprime (talk) 10:01, 22 April 2014 (UTC)

Pungent odor[edit]

An unsourced comment about "mangrove's pungent odor" was removed from the section on Nutrient uptake. I have found ad source on why the soil in mangals is sometimes very pungent (Ecology and Environment of Mangrove Ecosystems, Page 110, from the United Nations University OpenCourseWare Syllabus), but I'm not sure where it would fit in to the article. Any ideas? -- Donald Albury 02:14, 30 May 2012 (UTC)

This section needs attention from an expert in Ecology.[edit]

This section needs attention from an expert in Ecology. — Preceding unsigned comment added by Suhailsmsm (talkcontribs) 09:05, 21 January 2013 (UTC)

What section and why? --Epipelagic (talk) 10:10, 21 January 2013 (UTC)

Distribution[edit]

The lead sentence gives the distribution of mangroves as "mainly between latitudes 25° N and 25° S". However, this is not consistent with the map, from which 30° N and 30° S would be a better fit, with the exception of Aus and NZ, where there is a further southward extension. Unless there is any objection, I propose to make this change. Plantsurfer (talk) 11:07, 19 March 2015 (UTC)