A mangrove is a shrub or tree that grows in coastal saline or brackish water. The term is also used for tropical coastal vegetation consisting of such species. Mangroves occur worldwide in the tropics and subtropics and even some temperate coastal areas, mainly between latitudes 30° N and 30° S, with the greatest mangrove area within 5° of the equator.[1][2] Mangrove plant families first appeared during the Late Cretaceous to Paleocene epochs, and became widely distributed in part due to the movement of tectonic plates. The oldest known fossils of mangrove palm date to 75 million years ago.[2]

Mangroves are hardy shrubs and trees that thrive in salt water and have specialised adaptations so they can survive the volatile energies of intertidal zones along marine coasts

Mangroves are salt-tolerant trees, also called halophytes, and are adapted to live in harsh coastal conditions. They contain a complex salt filtration system and a complex root system to cope with saltwater immersion and wave action. They are adapted to the low-oxygen conditions of waterlogged mud,[3] but are most likely to thrive in the upper half of the intertidal zone.[4]

The mangrove biome, or mangal, is a distinct saline woodland or shrubland habitat characterized by depositional coastal environments, where fine sediments (often with high organic content) collect in areas protected from high-energy wave action. The saline conditions tolerated by various mangrove species range from brackish water, through pure seawater (3 to 4% salinity), to water concentrated by evaporation to over twice the salinity of ocean seawater (up to 9% salinity).[5][6]

Beginning in 2010[7][1] remote sensing technologies and global data have been used to assess areas, conditions and deforestation rates of mangroves around the world.[2] In 2018, the Global Mangrove Watch Initiative released a new global baseline which estimates the total mangrove forest area of the world as of 2010 at 137,600 km2 (53,100 sq mi), spanning 118 countries and territories.[2][7] Mangrove loss continues due to human activity, with a global annual deforestation rate estimated at 0.16%, and per-country rates as high as 0.70%. Degradation in quality of remaining mangroves is also an important concern.[2]

There is interest in mangrove restoration for several reasons. Mangroves support sustainable coastal and marine ecosystems. They protect nearby areas from tsunamis and extreme weather events. Mangrove forests are also effective at carbon sequestration and storage and impede climate change.[2][8][9] The success of mangrove restoration may depend heavily on engagement with local stakeholders, and on careful assessment to ensure that growing conditions will be suitable for the species chosen.[4]

EtymologyEdit

Etymology of the English term mangrove can only be speculative and is disputed.[10]: 1–2  [11] The term may have come to English from the Portuguese mangue or the Spanish mangle.[11] Farther back, it may be traced to South America and Cariban and Arawakan languages[12] such as Taíno.[13] Other possibilities include the Malay language manggi-manggi[11][10] and the Guarani language.[citation needed] The English usage may reflect a corruption via folk etymology of the words mangrow and grove.[12][10][14]

The word "mangrove" is used in at least three senses:

  • most broadly to refer to the habitat and entire plant assemblage or mangal,[11][15][page needed] for which the terms mangrove forest biome and mangrove swamp are also used;
  • to refer to all trees and large shrubs in a mangrove swamp;[11] and
  • narrowly to refer only to mangrove trees of the genus Rhizophora of the family Rhizophoraceae.[16]

BiologyEdit

 
Red mangrove
 
Salt crystals formed on an Avicennia marina leaf

Of the recognized 110 mangrove species, only about 54 species in 20 genera from 16 families constitute the "true mangroves", species that occur almost exclusively in mangrove habitats.[15] Demonstrating convergent evolution, many of these species found similar solutions to the tropical conditions of variable salinity, tidal range (inundation), anaerobic soils, and intense sunlight. Plant biodiversity is generally low in a given mangrove.[17] The greatest biodiversity of mangroves occurs in Southeast Asia, particularly in the Indonesian archipelago.[18]

Adaptations to low oxygenEdit

The red mangrove (Rhizophora mangle) survives in the most inundated areas, props itself above the water level with stilt or prop roots and then absorbs air through lenticels in its bark.[19] The black mangrove (Avicennia germinans) lives on higher ground and develops many specialized root-like structures called pneumatophores, which stick up out of the soil like straws for breathing.[20][21] These "breathing tubes" typically reach heights of up to 30 cm (12 in), and in some species, over 3 m (9.8 ft). The four types of pneumatophores are stilt or prop type, snorkel or peg type, knee type, and ribbon or plank type. Knee and ribbon types may be combined with buttress roots at the base of the tree. The roots also contain wide aerenchyma to facilitate transport within the plants.[citation needed]

Nutrient uptakeEdit

Because the soil is perpetually waterlogged, little free oxygen is available. Anaerobic bacteria liberate nitrogen gas, soluble ferrum (iron), inorganic phosphates, sulfides, and methane, which make the soil much less nutritious.[citation needed] Pneumatophores (aerial roots) allow mangroves to absorb gases directly from the atmosphere, and other nutrients such as iron, from the inhospitable soil. Mangroves store gases directly inside the roots, processing them even when the roots are submerged during high tide.

Limiting salt intakeEdit

Red mangroves exclude salt by having significantly impermeable roots which are highly suberised (impregnated with suberin), acting as an ultra-filtration mechanism to exclude sodium salts from the rest of the plant. Analysis of water inside mangroves has shown 90% to 97% of salt has been excluded at the roots. In a frequently cited concept that has become known as the "sacrificial leaf", salt which does accumulate in the shoot (sprout) than concentrates in old leaves, which the plant then sheds. However, recent research suggests the older, yellowing leaves have no more measurable salt content than the other, greener leaves.[22] Red mangroves can also store salt in cell vacuoles. White and grey mangroves can secrete salts directly; they have two salt glands at each leaf base (correlating with their name—they are covered in white salt crystals).

Limiting water lossEdit

Because of the limited fresh water available in salty intertidal soils, mangroves limit the amount of water they lose through their leaves. They can restrict the opening of their stomata (pores on the leaf surfaces, which exchange carbon dioxide gas and water vapor during photosynthesis). They also vary the orientation of their leaves to avoid the harsh midday sun and so reduce evaporation from the leaves. A captive red mangrove grows only if its leaves are misted with fresh water several times a week, simulating frequent tropical rainstorms.[23]

Filtration of seawaterEdit

Seawater filtration in the root of the mangrove Rhizophora stylosa
(a) Schematic of the root. The outermost layer is composed of three layers. The root is immersed in NaCl solution.
(b) Water passes through the outermost layer when a negative suction pressure is applied across the outermost layer. The Donnan potential effect repels Cl ions from the first sublayer of the outermost layer. Na+ ions attach to the first layer to satisfy the electro-neutrality requirement and salt retention eventually occurs.[24]

A 2016 study by Kim et al. investigated the biophysical characteristics of sea water filtration in the roots of the mangrove Rhizophora stylosa from a plant hydrodynamic point of view. R. stylosa can grow even in saline water and the salt level in its roots is regulated within a certain threshold value through filtration. The root possesses a hierarchical, triple layered pore structure in the epidermis and most Na+ ions are filtered at the first sublayer of the outermost layer. The high blockage of Na+ ions is attributed to the high surface zeta potential of the first layer. The second layer, which is composed of macroporous structures, also facilitates Na+ ion filtration. The study provides insights into the mechanism underlying water filtration through halophyte roots and could serve as a basis for the development of a bio-inspired method of desalination.[24]

Uptake of Na+ ions is desirable for halophytes to build up osmotic potential, absorb water and sustain turgor pressure. However, excess Na+ions may work on toxic element. Therefore, halophytes try to adjust salinity delicately between growth and survival strategies. In this point of view, a novel sustainable desalination method can be derived from halophytes, which are in contact with saline water through their roots. Halophytes exclude salt through their roots, secrete the accumulated salt through their aerial parts and sequester salt in senescent leaves and/or the bark.[25][26][27] Mangroves are facultative halophytes and Bruguiera is known for its special ultrafiltration system that can filter approximately 90% of Na+ions from the surrounding seawater through the roots.[28][29][30] The species also exhibits a high rate of salt rejection. The water-filtering process in mangrove roots has received considerable attention for several decades.[31][32] Morphological structures of plants and their functions have been evolved through a long history to survive against harsh environmental conditions.[33][24]

Increasing survival of offspringEdit

 
A germinating Avicennia seed

In this harsh environment, mangroves have evolved a special mechanism to help their offspring survive. Mangrove seeds are buoyant and are therefore suited to water dispersal. Unlike most plants, whose seeds germinate in soil, many mangroves (e.g. red mangrove) are viviparous, meaning their seeds germinate while still attached to the parent tree. Once germinated, the seedling grows either within the fruit (e.g. Aegialitis, Avicennia and Aegiceras), or out through the fruit (e.g. Rhizophora, Ceriops, Bruguiera and Nypa) to form a propagule (a ready-to-go seedling) which can produce its own food via photosynthesis.

The mature propagule then drops into the water, which can transport it great distances. Propagules can survive desiccation and remain dormant for over a year before arriving in a suitable environment. Once a propagule is ready to root, its density changes so that the elongated shape now floats vertically rather than horizontally. In this position, it is more likely to lodge in the mud and root. If it does not root, it can alter its density and drift again in search of more favorable conditions.

Taxonomy and evolutionEdit

The following listings, based on Tomlinson, 2016, give the mangrove species in each listed plant genus and family.[34] Mangrove environments in the Eastern Hemisphere harbor six times as many species of trees and shrubs as do mangroves in the New World. Genetic divergence of mangrove lineages from terrestrial relatives, in combination with fossil evidence, suggests mangrove diversity is limited by evolutionary transition into the stressful marine environment, and the number of mangrove lineages has increased steadily over the Tertiary with little global extinction.[35]

True mangrovesEdit

True mangroves (major components or strict mangroves)
Following Tomlinson, 2016, the following 35 species are the true mangroves, contained in 5 families and 9 genera [34]: 29–30 
Included on green backgrounds are annotations about the genera made by Tomlinson
Family Genus Mangrove species Common name
Arecaceae Monotypic subfamily within the family
Nypa Nypa fruticans Mangrove palm  
Avicenniaceae
(disputed)
Old monogeneric family, now subsumed in Acanthaceae, but clearly isolated
Avicennia Avicennia alba  
Avicennia balanophora
Avicennia bicolor
Avicennia integra
Avicennia marina grey mangrove
(subspecies: australasica,
eucalyptifolia, rumphiana)
 
Avicennia officinalis Indian mangrove  
Avicennia germinans black mangrove  
Avicennia schaueriana  
Avicennia tonduzii
Combretaceae Tribe Lagunculariae (including Macropteranthes = non-mangrove)
Laguncularia Laguncularia racemosa white mangrove  
Lumnitzera Lumnitzera racemosa white-flowered black mangrove  
Lumnitzera littorea  
Rhizophoraceae Rhizophoraceae collectively form the tribe Rhizophorae, a monotypic group, within the otherwise terrestrial family
Bruguiera Bruguiera cylindrica  
Bruguiera exaristata rib-fruited mangrove  
Bruguiera gymnorhiza oriental mangrove  
Bruguiera hainesii
Bruguiera parviflora  
Bruguiera sexangula upriver orange mangrove  
Ceriops Ceriops australis yellow mangrove  
Ceriops tagal spurred mangrove  
Kandelia Kandelia candel  
Kandelia obovata  
Rhizophora Rhizophora apiculata
Rhizophora harrisonii
Rhizophora mangle red mangrove
Rhizophora mucronata Asiatic mangrove  
Rhizophora racemosa
Rhizophora samoensis Samoan mangrove
Rhizophora stylosa spotted mangrove,
Rhizophora x lamarckii
Lythraceae Sonneratia Sonneratia alba  
Sonneratia apetala
Sonneratia caseolaris
Sonneratia ovata
Sonneratia griffithii

Minor componentsEdit

Minor components
Tomlinson, 2016, lists about 19 species as minor mangrove components, contained in 10 families and 11 genera [34]: 29–30 
Included on green backgrounds are annotations about the genera made by Tomlinson
Family Genus Species Common name
Euphorbiaceae This genus includes about 35 non-mangrove taxa
Excoecaria Excoecaria agallocha milky mangrove, blind-your-eye mangrove and river poison tree  
Lythraceae Genus distinct in the family
Pemphis Pemphis acidula bantigue or mentigi  
Malvaceae Formerly in Bombacaceae, now an isolated genus in subfamily Bombacoideeae
Camptostemon Camptostemon schultzii kapok mangrove  
Camptostemon philippinense  
Meliaceae Genus of 3 species, one non-mangrove, forms tribe Xylocarpaeae with Carapa, a non–mangrove
Xylocarpus Xylocarpus granatum  
Xylocarpus moluccensis  
Myrtaceae An isolated genus in the family
Osbornia Osbornia octodonta mangrove myrtle  
Pellicieraceae Monotypic genus and family of uncertain phylogenetic position
Pelliciera Pelliciera rhizophorae, tea mangrove  
Plumbaginaceae Isolated genus, at times segregated as family Aegialitidaceae
Aegialitis Aegialitis annulata club mangrove  
Aegialitis rotundifolia  
Primulaceae Formerly an isolated genus in Myrsinaceae
Aegiceras Aegiceras corniculatum black mangrove, river mangrove or khalsi  
Aegiceras floridum
Pteridaceae A fern somewhat isolated in its family
Acrostichum Acrostichum aureum golden leather fern, swamp fern or mangrove fern  
Acrostichum speciosum mangrove fern  
Rubiaceae A genus isolated in the family
Scyphiphora Scyphiphora hydrophylacea nilad  

Species distributionEdit

 
Global distribution of native mangrove species, 2010[36]
Not shown are introduced ranges: Rhizophora stylosa in French Polynesia, Bruguiera sexangula, Conocarpus erectus, and Rhizophora mangle in Hawaii, Sonneratia apelata in China, and Nypa fruticans in Cameroon and Nigeria.

Mangroves are a type of tropical vegetation with some outliers established in subtropical latitudes, notably in South Florida and southern Japan, as well as South Africa, New Zealand and Victoria (Australia). These outliers result either from unbroken coastlines and island chains or from reliable supplies of propagules floating on warm ocean currents from rich mangrove regions.[34]: 57 

 
Location and relative density of mangroves in South-east Asia and Australasia – based on Landsat satellite images, 2010 [37]
 
Global distribution of threatened mangrove species, 2010[36]

"At the limits of distribution, the formation is represented by scrubby, usually monotypic Avicennia-dominated vegetation, as at Westonport Bay and Corner Inlet, Victoria, Australia. The latter locality is the highest latitude (38° 45'S) at which mangroves occur naturally. The mangroves in New Zealand, which extend as far south as 37°, are of the same type; they start as low forest in the northern part of the North Island but become low scrub toward their southern limit. In both instances, the species is referred to as Avicennia marina var. australis, although genetic comparison is clearly needed. In Western Australia, A. marina extends as far south as Sunbury (33° 19'S). In the northern hemisphere, scrubby Avicennia gerrninans in Florida occurs as far north as St. Augustine on the east coast and Cedar Point on the west. There are records of A. germinans and Rhizophora mangle for Bermuda, presumably supplied by the Gulf Stream. In southern Japan, Kandelia obovata occurs to about 31 °N (Tagawa in Hosakawa et al., 1977, but initially referred to as K. candel)."[34]: 57 

Mangrove forestsEdit

 
Global distribution of mangrove forests

Mangrove forests, also called mangrove swamps or mangals, are found in tropical and subtropical tidal areas. Areas where mangroves occur include estuaries and marine shorelines.[17]

The intertidal existence to which these trees are adapted represents the major limitation to the number of species able to thrive in their habitat. High tide brings in salt water, and when the tide recedes, solar evaporation of the seawater in the soil leads to further increases in salinity. The return of tide can flush out these soils, bringing them back to salinity levels comparable to that of seawater.[2][4]

At low tide, organisms are also exposed to increases in temperature and reduced moisture before being then cooled and flooded by the tide. Thus, for a plant to survive in this environment, it must tolerate broad ranges of salinity, temperature, and moisture, as well as several other key environmental factors—thus only a select few species make up the mangrove tree community.[4][2]

About 110 species are considered mangroves, in the sense of being trees that grow in such a saline swamp,[17] though only a few are from the mangrove plant genus, Rhizophora. However, a given mangrove swamp typically features only a small number of tree species. It is not uncommon for a mangrove forest in the Caribbean to feature only three or four tree species. For comparison, the tropical rainforest biome contains thousands of tree species, but this is not to say mangrove forests lack diversity. Though the trees themselves are few in species, the ecosystem that these trees create provides a home (habitat) for a great variety of other species, including as many as 174 species of marine megafauna.[38]

Mangrove plants require a number of physiological adaptations to overcome the problems of low environmental oxygen levels, high salinity, and frequent tidal flooding. Each species has its own solutions to these problems; this may be the primary reason why, on some shorelines, mangrove tree species show distinct zonation. Small environmental variations within a mangal may lead to greatly differing methods for coping with the environment. Therefore, the mix of species is partly determined by the tolerances of individual species to physical conditions, such as tidal flooding and salinity, but may also be influenced by other factors, such as crabs preying on plant seedlings.[39]

 
Mangrove roots above and below water
 
Nipa palms, Nypa fruticans, the only palm species fully adapted to the mangrove biome

Once established, mangrove roots provide an oyster habitat and slow water flow, thereby enhancing sediment deposition in areas where it is already occurring. The fine, anoxic sediments under mangroves act as sinks for a variety of heavy (trace) metals which colloidal particles in the sediments have concentrated from the water. Mangrove removal disturbs these underlying sediments, often creating problems of trace metal contamination of seawater and organisms of the area.[40]

Mangrove swamps protect coastal areas from erosion, storm surge (especially during tropical cyclones), and tsunamis.[41][42][43] They limit high-energy wave erosion mainly during events such as storm surges and tsunamis.[44] The mangroves' massive root systems are efficient at dissipating wave energy.[45] Likewise, they slow down tidal water enough so that its sediment is deposited as the tide comes in, leaving all except fine particles when the tide ebbs.[46] In this way, mangroves build their environments.[41] Because of the uniqueness of mangrove ecosystems and the protection against erosion they provide, they are often the object of conservation programs,[4] including national biodiversity action plans.[42]

The unique ecosystem found in the intricate mesh of mangrove roots offers a quiet marine habitat for young organisms.[47] In areas where roots are permanently submerged, the organisms they host include algae, barnacles, oysters, sponges, and bryozoans, which all require a hard surface for anchoring while they filter-feed. Shrimps and mud lobsters use the muddy bottoms as their home.[48] Mangrove crabs eat the mangrove leaves, adding nutrients to the mangal mud for other bottom feeders.[49] In at least some cases, the export of carbon fixed in mangroves is important in coastal food webs.[50]

Mangrove plantations in Vietnam, Thailand, Philippines, and India host several commercially important species of fish and crustaceans.[51]

Mangrove forests can decay into peat deposits because of fungal and bacterial processes as well as by the action of termites. It becomes peat in good geochemical, sedimentary, and tectonic conditions.[52] The nature of these deposits depends on the environment and the types of mangroves involved. In Puerto Rico, the red, white, and black mangroves occupy different ecological niches and have slightly different chemical compositions, so the carbon content varies between the species, as well between the different tissues of the plant (e.g., leaf matter versus roots).[52]

In Puerto Rico, there is a clear succession of these three trees from the lower elevations, which are dominated by red mangroves, to farther inland with a higher concentration of white mangroves.[52] Mangrove forests are an important part of the cycling and storage of carbon in tropical coastal ecosystems.[52] Knowing this, scientists seek to reconstruct the environment and investigate changes to the coastal ecosystem over thousands of years using sediment cores.[53] However, an additional complication is the imported marine organic matter that also gets deposited in the sediment due to the tidal flushing of mangrove forests.[52]

Termites play an important role in the formation of peat from mangrove materials.[52] They process fallen leaf litter, root systems and wood from mangroves into peat to build their nests.[52] Termites stabilise the chemistry of this peat and represent approximately 2% of above ground carbon storage in mangroves.[52] As the nests are buried over time this carbon is stored in the sediment and the carbon cycle continues.[52]

Mangroves are an important source of blue carbon. Globally, mangroves stored 4.19 Gt (9.2×1012 lb) of carbon in 2012.[54] Two percent of global mangrove carbon was lost between 2000 and 2012, equivalent to a maximum potential of 0.316996250 Gt (6.9885710×1011 lb) of CO2 emissions.[54]

Globally, mangroves have been shown to provide measurable economic protections to coastal communities affected by tropical storms.[55]

Mangrove microbiomesEdit

Plant microbiomes play crucial roles in their health and productivity of mangroves.[56] Many researchers have successfully applied knowledge acquired about plant microbiomes to produce specific inocula for crop protection.[57][58] Such inocula can stimulate plant growth by releasing phytohormones and enhancing uptake of some mineral nutrients (particularly phosphorus and nitrogen).[58][59][60] However, most of the plant microbiome studies have focused on the model plant Arabidopsis thaliana and economically important crop plants, such as barley, corn, soybean, rice and wheat. There is less information on microbiomes of tree species.[56][58] Plant microbiomes are determined by plant-related factors (e.g., genotype, organ, species, and health status) and environmental factors (e.g., land use, climate, and nutrient availability).[56][60] Two of the plant-related factors, plant species and genotypes, have been shown to play significant roles in shaping rhizosphere and plant microbiomes, as tree genotypes and species are associated with specific microbial communities.[59] Different plant organs also have specific microbial communities depending on plant-associated factors (plant genotype, available nutrients, and organ-specific physicochemical conditions) and/or environmental conditions (associated with aboveground and underground surfaces and disturbances).[61][62][63][64]

Root microbiomeEdit

 
Bacterial and fungal community in a mangrove tree[64]
Bacterial taxonomic community composition in the rhizosphere soil and fungal taxonomic community composition in all four rhizosphere soil and plant compartments. Information on the fungal ecological functional groups is also provided. Proportions of fungal OTUs that can colonise at least two of the compartments are shown in the left panel.

Mangrove roots harbour a repertoire of microbial taxa that contribute to important ecological functions in mangrove ecosystems. Similar to typical terrestrial plants, mangroves depend upon mutually beneficial interactions with microbial communities.[65] In particular, microbes residing in developed roots could help mangroves transform nutrients into usable forms prior to plant assimilation.[66][67] These microbes also provide mangroves phytohormones for suppressing phytopathogens[68] or helping mangroves withstand heat and salinity.[65] In turn, root-associated microbes receive carbon metabolites from the plant via root exudates8, thus close associations between the plant and microbes are established for their mutual benefits.[69][70]

Highly diverse microbial communities (mainly bacteria and fungi) have been found to inhabit and function in mangrove roots.[71][65][72] For example, diazotrophic bacteria in the vicinity of mangrove roots could perform biological nitrogen fixation, which provides 40–60% of the total nitrogen required by mangroves;[73][74] the soil attached to mangrove roots lacks oxygen but is rich in organic matter, providing an optimal microenvironment for sulfate-reducing bacteria (SRB) and methanogens1; ligninolytic, cellulolytic, and amylolytic fungi are prevalent in the mangrove root environment;[65] rhizosphere fungi could help mangroves survive in waterlogged and nutrient-restricted environments.[75] These studies have provided increasing evidences to support the importance of root-associated bacteria and fungi for mangrove growth and health.[65][66][70]

Recent studies have investigated the detailed structure of root-associated microbial communities at a continuous fine-scale in other plants15, where a microhabitat was divided into four root compartments: endosphere,[68][76][77] episphere,[68] rhizosphere,[76][78] and nonrhizosphere.[79][80] Moreover, the microbial communities in each compartment have been reported to have unique characteristics.[68][76] The rhizosphere could emit root exudates that selectively enriched specific microbial populations; however, these exudates were found to exert only marginal impacts on microbes in the nonrhizosphere soil.[81][69] Furthermore, it was noted that the root episphere, rather than the rhizosphere, was primarily responsible for controlling the entry of specific microbial populations into the root,[68] resulting in the selective enrichment of Proteobacteria in the endosphere.[68][82] These findings provide new insights into the niche differentiation of root-associated microbial communities,[68][81][69][82] Nevertheless, amplicon-based community profiling may not provide the functional characteristics of root-associated microbial communities in plant growth and biogeochemical cycling.[83] Unraveling functional patterns across the four root compartments holds a great potential for understanding functional mechanisms responsible for mediating root–microbe interactions in support of enhancing mangrove ecosystem functioning.[70]

Mangrove viromesEdit

 
Phages are viruses that infect bacteria, such as cyanobacteria. Shown are the virions of different families of tailed phages: Myoviridae, Podoviridae and Siphoviridae
 
Phylogenetic tree of tailed phages
found in the mangrove virome [84]
Reference sequences are coloured black, and virome contigs are indicated with varied colours. The scale bar represents half amino acid substitution per site.

Mangroves forests are one of the most carbon-rich biomes, accounting for 11% of the total input of terrestrial carbon into oceans. Although viruses are thought to significantly influence local and global biogeochemical cycles, though as of 2019 little information was available about the community structure, genetic diversity and ecological roles of viruses in mangrove ecosystems.[84]

Viruses are the most abundant biological entities on earth, present in virtually all ecosystems.[85][86] By lysing their hosts, that is, by rupturing their cell membranes, viruses control host abundance and affect the structure of host communities.[87] Viruses also influence their host diversity and evolution through horizontal gene transfer, selection for resistance and manipulation of bacterial metabolisms.[88][89][90] Importantly, marine viruses affect local and global biogeochemical cycles through the release of substantial amounts of organic carbon and nutrients from hosts and assist microbes in driving biogeochemical cycles with auxiliary metabolic genes (AMGs).[91][92][93][84]

It is presumed AMGs augment viral-infected host metabolism and facilitate the production of new viruses.[88][94] AMGs have been extensively explored in marine cyanophages and include genes involved in photosynthesis, carbon turnover, phosphate uptake and stress response.[95][96][97][98] Cultivation-independent metagenomic analysis of viral communities has identified additional AMGs that are involved in motility, central carbon metabolism, photosystem I, energy metabolism, iron–sulphur clusters, anti-oxidation and sulphur and nitrogen cycling.[92][99][100][101][102][103][104] Interestingly, a recent analysis of Pacific Ocean Virome data identified niche-specialised AMGs that contribute to depth-stratified host adaptations.[105] Given that microbes drive global biogeochemical cycles, and a large fraction of microbes is infected by viruses at any given time,[106] viral-encoded AMGs must play important roles in global biogeochemistry and microbial metabolic evolution.[84]

Mangrove forests are the only woody halophytes that live in salt water along the world’s subtropical and tropical coastlines. Mangroves are one of the most productive and ecologically important ecosystems on earth. The rates of primary production of mangroves equal those of tropical humid evergreen forests and coral reefs.[107] As a globally relevant component of the carbon cycle, mangroves sequester approximately 24 million metric tons of carbon each year.[107][108] Most mangrove carbon is stored in soil and sizable belowground pools of dead roots, aiding in the conservation and recycling of nutrients beneath forests.[109] Although mangroves cover only 0.5% of the earth’s coastal area, they account for 10–15% of the coastal sediment carbon storage and 10–11% of the total input of terrestrial carbon into oceans.[110] The disproportionate contribution of mangroves to carbon sequestration is now perceived as an important means to counterbalance greenhouse gas emissions.[84]

 
Circular representation of the chloroplast genome
for the grey mangrove, Avicennia marina[111]

Despite the ecological importance of mangrove ecosystem, our knowledge on mangrove biodiversity is notably limited. Previous reports mainly investigated the biodiversity of mangrove fauna, flora and bacterial communities.[112][113][114] Particularly, little information is available about viral communities and their roles in mangrove soil ecosystems.[115][116] In view of the importance of viruses in structuring and regulating host communities and mediating element biogeochemical cycles, exploring viral communities in mangrove ecosystems is essential. Additionally, the intermittent flooding of sea water and resulting sharp transition of mangrove environments may result in substantially different genetic and functional diversity of bacterial and viral communities in mangrove soils compared with those of other systems.[117][84]

Genome sequencingEdit

See alsoEdit

ReferencesEdit

  1. ^ a b Giri, C.; Ochieng, E.; Tieszen, L. L.; Zhu, Z.; Singh, A.; Loveland, T.; Masek, J.; Duke, N. (January 2011). "Status and distribution of mangrove forests of the world using earth observation satellite data: Status and distributions of global mangroves". Global Ecology and Biogeography. 20 (1): 154–159. doi:10.1111/j.1466-8238.2010.00584.x. Retrieved 12 August 2021.
  2. ^ a b c d e f g h Friess, D. A.; Rogers, K.; Lovelock, C. E.; Krauss, K. W.; Hamilton, S. E.; Lee, S. Y.; Lucas, R.; Primavera, J.; Rajkaran, A.; Shi, S. (2019). "The State of the World's Mangrove Forests: Past, Present, and Future". Annual Review of Environment and Resources. 44 (1): 89–115. doi:10.1146/annurev-environ-101718-033302.
  3. ^ Flowers, T. J.; Colmer, T. D. (2015). "Plant salt tolerance: adaptations in halophytes". Annals of Botany. 115 (3): 327–331. doi:10.1093/aob/mcu267. PMC 4332615. PMID 25844430.
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