The Rabaul Strike of 1929 was the first ever industrial strike in Papua New Guinea .
88-458: The strike began on January 2, 1929 in the township of Rabaul , then the capital of the Territory of New Guinea . The goal of the strike was increased wages. The strike was led by Sumsuma , who was assisted by N'Dramei of Manus, the senior sergeant-major of the police. Around 3,000 workers participated in the strike, a majority of Rabaul's working population. The strikers had originally planned for
176-555: A basis for the development of a bio-inspired method of desalination . 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
264-589: 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, but are most likely to thrive in the upper half of the intertidal zone . The mangrove biome , often called the mangrove forest 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. Mangrove forests serve as vital habitats for
352-468: A critical food source for larger predators like birds, reptiles, and mammals within the ecosystem. Additionally, mangrove forests function as essential nurseries for many commercially important fish species, providing a sheltered environment rich in nutrients during their early life stages. The decomposition of leaves and organic matter in the water further enhances the nutrient content, supporting overall ecosystem productivity. In summary, mangrove forests play
440-434: A crucial and unbiased role in sustaining biodiversity and ecological balance within coastal food webs. Larger marine organisms benefit from the habitat as a nursery for their offspring. Lemon sharks depend on mangrove creeks to give birth to their pups. The ecosystem provides little competition and minimizes threats of predation to juvenile lemon sharks as they use the cover of mangroves to practice hunting before entering
528-534: A diverse array of aquatic species, offering a unique ecosystem that supports the intricate interplay of marine life and terrestrial vegetation. 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). Beginning in 2010, remote sensing technologies and global data have been used to assess areas, conditions and deforestation rates of mangroves around
616-452: A fundamental environmental index for future reference. Mangrove forests are one of the most carbon-rich biomes, accounting for 11% of the total input of terrestrial carbon into oceans. 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. Viruses are
704-465: 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
792-622: 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. 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. 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
880-464: 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
968-411: A higher concentration of white mangroves. Mangrove forests are an important part of the cycling and storage of carbon in tropical coastal ecosystems. Knowing this, scientists seek to reconstruct the environment and investigate changes to the coastal ecosystem over thousands of years using sediment cores. However, an additional complication is the imported marine organic matter that also gets deposited in
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#17328453342461056-480: A home (habitat) for a great variety of other species, including as many as 174 species of marine megafauna . 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
1144-410: A key role in maintaining prey species along coastlines and within mangrove ecosystems. 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. The nature of these deposits depends on the environment and the types of mangroves involved. In Puerto Rico ,
1232-520: A large pyroclastic shield volcano. Rabaul was planned and built around the harbour area known as Simpsonhafen (Simpson Harbour) during the German New Guinea administration, which controlled the region from 1884 and formally through 1919. Rabaul was selected as the capital of the German New Guinea administration in 1905, and the administrative offices were transferred there in 1910. Rabaul
1320-407: A long history to survive against harsh environmental conditions. 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
1408-457: 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. Once established, mangrove roots provide an oyster habitat and slow water flow, thereby enhancing sediment deposition in areas where it
1496-564: A much more powerful base than the Australians had planned after the 1937 volcanic eruptions, with long-term consequences for the town in the post-war period. The Japanese army dug many kilometres of tunnels as shelter from Allied air attacks, such as the bombing of November 1943 . They also expanded the facilities by constructing army barracks and support structures. By 1943 there were about 110,000 Japanese troops based in Rabaul. On 18 April 1943,
1584-451: A quiet marine habitat for young organisms. 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. Mangrove crabs eat the mangrove leaves, adding nutrients to the mangal mud for other bottom feeders. In at least some cases,
1672-455: A recent analysis of Pacific Ocean Virome data identified niche-specialised AMGs that contribute to depth-stratified host adaptations. Given that microbes drive global biogeochemical cycles, and a large fraction of microbes is infected by viruses at any given time, viral-encoded AMGs must play important roles in global biogeochemistry and microbial metabolic evolution. Mangrove forests are the only woody halophytes that live in salt water along
1760-570: A repertoire of microbial taxa that contribute to important ecological functions in mangrove ecosystems. Like typical terrestrial plants, mangroves depend upon mutually beneficial interactions with microbial communities. In particular, microbes residing in developed roots could help mangroves transform nutrients into usable forms before plant assimilation. These microbes also provide mangroves phytohormones for suppressing phytopathogens or helping mangroves withstand heat and salinity. In turn, root-associated microbes receive carbon metabolites from
1848-586: A town, an eruption formed a volcano in the harbour. For other eruptions, see Rabaul caldera . In 1910 the German colonial government during the administration of Governor Albert Hahl moved offices, the district court, a hospital and customs and postal facilities from Herbertshöhe (today's Kokopo ) to Simpsonhafen . That settlement was thus substantially enlarged with official buildings and housing and renamed Rabaul , meaning mangrove in Kuanua (the local language) as
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#17328453342461936-454: A volcanic eruption in its harbor. During the eruption, ash was sent thousands of metres into the air, and the subsequent rain of ash caused 80% of the buildings in Rabaul to collapse. After the eruption the capital was moved to Kokopo , about 20 kilometres (12 mi) away. Rabaul is continually threatened by volcanic activity, because it is on the edge of the Rabaul caldera , a flooded caldera of
2024-402: A week, simulating frequent tropical rainstorms. 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
2112-405: 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. The following listings, based on Tomlinson, 2016, give
2200-497: Is a shrub or tree that grows mainly in coastal saline or brackish water . Mangroves grow in an equatorial climate, typically along coastlines and tidal rivers. They have particular adaptations to take in extra oxygen and remove salt, allowing them to tolerate conditions that kill most plants. The term is also used for tropical coastal vegetation consisting of such species. Mangroves are taxonomically diverse due to convergent evolution in several plant families. They occur worldwide in
2288-480: Is a stub . You can help Misplaced Pages by expanding it . Rabaul Rabaul ( / r ɑː ˈ b aʊ l / ) is a township in the East New Britain province of Papua New Guinea , on the island of New Britain . It lies about 600 kilometres to the east of the island of New Guinea . Rabaul was the provincial capital and most important settlement in the province until it was destroyed in 1994 by falling ash from
2376-705: 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. Mangrove swamps protect coastal areas from erosion , storm surge (especially during tropical cyclones ), and tsunamis . They limit high-energy wave erosion mainly during events such as storm surges and tsunamis. The mangroves' massive root systems are efficient at dissipating wave energy. Likewise, they slow down tidal water so that its sediment
2464-416: Is deposited as the tide comes in, leaving all except fine particles when the tide ebbs. In this way, mangroves build their environments. Because of the uniqueness of mangrove ecosystems and the protection against erosion they provide, they are often the object of conservation programs, including national biodiversity action plans . The unique ecosystem found in the intricate mesh of mangrove roots offers
2552-461: Is reported to be higher than in well-preserved mangroves Studies comparing mangroves in different conservation states show that bacterial composition in disturbed mangrove sediment alters its structure, leading to a functional equilibrium, where the dynamics of chemicals in mangrove soils lead to the remodeling of its microbial structure. Despite many research advancements in mangrove sediment bacterial metagenomics diversity in various conditions over
2640-492: Is stored in soil and sizable belowground pools of dead roots, aiding in the conservation and recycling of nutrients beneath forests. 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. The disproportionate contribution of mangroves to carbon sequestration is now perceived as an important means to counterbalance greenhouse gas emissions. Despite
2728-627: Is stored in the sediment and the carbon cycle continues. Mangroves are an important source of blue carbon . Globally, mangroves stored 4.19 Gt (9.2 × 10 lb) of carbon in 2012. Two percent of global mangrove carbon was lost between 2000 and 2012, equivalent to a maximum potential of 0.316996250 Gt (6.9885710 × 10 lb) of emissions of carbon dioxide in Earth's atmosphere . Globally, mangroves have been shown to provide measurable economic protections to coastal communities affected by tropical storms. Plant microbiomes play crucial roles in
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2816-679: The Montevideo Maru , which was sunk off the Philippines in June 1942. About six planters who had remained in the bush were executed in July 1942 after they gave themselves up to the Japanese, while 12 men, who had technical skills, were imprisoned in Rabaul, but were executed at the end of 1944. Four men were found in a camp when Rabaul was liberated. During their occupation the Japanese developed Rabaul into
2904-495: The Imperial Japanese Navy was one of the motivations for the Japanese invasion in 1942. Rabaul features a tropical rainforest climate , which is constantly hot, humid, overcast and oppressive. Rabaul experiences significant rainfall year-round, and is classified as Af by Köppen and Geiger. The average annual temperature in Rabaul is 26.9 °C and rainfall there averages 2201 mm. Mangrove A mangrove
2992-564: The Malay language manggi-manggi The English usage may reflect a corruption via folk etymology of the words mangrow and grove . The word "mangrove" is used in at least three senses: According to Hogarth (2015), among the recognized mangrove species there are about 70 species in 20 genera from 16 families that constitute the "true mangroves" – species that occur almost exclusively in mangrove habitats. Demonstrating convergent evolution , many of these species found similar solutions to
3080-480: The bulk soil outside the rhizosphere . 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, resulting in the selective enrichment of Proteobacteria in the endosphere. These findings provide new insights into the niche differentiation of root-associated microbial communities, Nevertheless, amplicon-based community profiling may not provide
3168-420: 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). 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
3256-633: 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 . 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. Mangroves are salt-tolerant trees, shrubs and ferns also called halophytes , and are adapted to live in harsh coastal conditions. They contain
3344-549: The 1937 volcano eruption, its remains became a tourist attraction after World War II and remained so until the 1994 further volcanic destruction of Rabaul. In 1929, Rabaul was the site of the Rabaul Strike , the first industrial strike in Papua New Guinea. "Rabaul volcano is one of the most active and most dangerous volcanoes in Papua New Guinea." Having erupted and entirely destroyed Rabaul on 6 June 1937, five years before
3432-547: The Australian administration, Rabaul developed into a regional base. Then in 1937, catastrophic volcanic eruptions destroyed the town after the two volcanoes, Tavurvur and Vulcan , exploded. 507 people were killed, and there was widespread damage. Following this, the Australian administration for the Territory of New Guinea decided to move the territorial headquarters to the safer location of Lae . All long-term steps to re-establish
3520-527: 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 Bunbury (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
3608-483: The United States executed Operation Vengeance , in which Admiral Isoroku Yamamoto , the architect of the Japanese attack on Pearl Harbor , was shot down and killed by a United States P-38 Lightning over south Bougainville . Yamamoto had taken off from Rabaul on an inspection tour, and United States Navy cryptographers had intercepted and then decrypted Japanese communications giving his flight itinerary. Because of
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3696-551: The accumulated salt through their aerial parts and sequester salt in senescent leaves and/or the bark. 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. The species also exhibits a high rate of salt rejection. The water-filtering process in mangrove roots has received considerable attention for several decades. Morphological structures of plants and their functions have been evolved through
3784-489: The approach involved flying over the Tavurvur crater, it was abandoned. The airport was in the direct path of the falling ash from the nearby vents. A new airport was built at Tokua, about 50 km farther away to the southeast. However, even it has been closed occasionally by ash thrown up by Tavurvur and driven by the northwest monsoon winds. Rabaul has a large, nearly enclosed harbour, Simpson Harbour . Use of this harbour by
3872-471: The caldera are often collectively called Rabaul , although the old town of Rabaul was reduced to practical insignificance by the volcanic eruption in 1937. As a tourist destination, Rabaul is popular for its volcanoes, scuba diving and for snorkelling sites, spectacular harbour and other scenery, World War II history, flora and fauna, and the cultural life of the Tolai people . Before the 1994 eruption, Rabaul
3960-464: The death toll low. Most of the buildings in the south-eastern half of Rabaul collapsed due to the weight of ash on their roofs. The last eruption and continuing low and modest levels of activity prompted moving the provincial capital to Kokopo , the former German Herbertshöhe . Nonetheless, Rabaul is slowly rebuilding inside the danger zone. Vulcan has remained quiet since 1994, but small and large eruptions from nearby Tavurvur occur intermittently, with
4048-509: The ecological importance of mangrove ecosystem, knowledge on mangrove biodiversity is notably limited. Previous reports mainly investigated the biodiversity of mangrove fauna, flora and bacterial communities. Particularly, little information is available about viral communities and their roles in mangrove soil ecosystems. In view of the importance of viruses in structuring and regulating host communities and mediating element biogeochemical cycles, exploring viral communities in mangrove ecosystems
4136-580: The end of the war and was only completed with the Japanese surrender in August 1945. After the Second World War, western New Guinea (renamed Papua) was returned to pre-war owner the Netherlands, and eastern New Guinea was returned to pre-war administrator Australia, and Rabaul flourished as the principal city and port of the archipelago, with one of the finest harbours in the world. By 1990 Rabaul's population
4224-411: The export of carbon fixed in mangroves is important in coastal food webs. Mangrove forests contribute significantly to coastal ecosystems by fostering complex and diverse food webs . The intricate root systems of mangroves create a habitat conducive to the proliferation of microorganisms, crustaceans, and small fish, forming the foundational tiers of the food chain. This abundance of organisms serves as
4312-568: The food web of the ocean. Mangrove plantations in Vietnam, Thailand, Philippines, and India host several commercially important species of fish and crustaceans. The mangrove food chain extends beyond the marine ecosystem. Coastal bird species inhabit the tidal ecosystems feeding off small marine organisms and wetland insects. Common bird families found in mangroves around the world are egrets , kingfishers , herons , and hornbills , among many others dependent on ecological range. Bird predation plays
4400-405: The functional characteristics of root-associated microbial communities in plant growth and biogeochemical cycling. 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. The diversity of bacteria in disturbed mangroves
4488-402: The health and productivity of mangroves. Many researchers have successfully applied knowledge acquired about plant microbiomes to produce specific inocula for crop protection. Such inocula can stimulate plant growth by releasing phytohormones and enhancing uptake of some mineral nutrients (particularly phosphorus and nitrogen). However, most of the plant microbiome studies have focused on
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#17328453342464576-626: The importance of root-associated bacteria and fungi for mangrove growth and health. Recent studies have investigated the detailed structure of root-associated microbial communities at a continuous fine-scale in other plants, where a microhabitat was divided into four root compartments: endosphere, episphere, rhizosphere, and nonrhizosphere or bulk soil . Moreover, the microbial communities in each compartment have been reported to have unique characteristics. Root exudates selectively enrich adapted microbial populations; however, these exudates were found to exert only marginal impacts on microbes in
4664-492: 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
4752-460: 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
4840-471: The local Catholic mission to mediate between them and the employers, but the mission refused. This, combined with the employers' refusal to negotiate at all and the general inexperience of the strikers, caused the strike to quickly fizzle out. By the afternoon of January 3, most of the strikers had returned to work. Sumsuma, along with N'Dramei and the other strike leaders were sentenced to 3 years in prison. This Papua New Guinea -related article
4928-472: 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. At low tide, organisms are also exposed to increases in temperature and reduced moisture before being then cooled and flooded by
5016-522: The mangrove species in each listed plant genus and family. 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
5104-403: The model plant Arabidopsis thaliana and economically important crop plants, such as rice , barley , wheat , maize and soybean . There is less information on the microbiomes of tree species. 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). Two of
5192-488: The most abundant biological entities on earth, present in virtually all ecosystems. By lysing their hosts, that is, by rupturing their cell membranes, viruses control host abundance and affect the structure of host communities. Viruses also influence their host diversity and evolution through horizontal gene transfer , selection for resistance and manipulation of bacterial metabolisms . Importantly, marine viruses affect local and global biogeochemical cycles through
5280-408: The most recent of note being on 29 August 2014. A government volcanological observatory was established on the northern ridge of the Rabaul caldera in the 1950s. A team there maintains its crucial watch over the town and the volcanoes until today. They are also responsible for monitoring other volcanoes on New Britain and nearby islands. Rabaul Airport was destroyed in the 1994 eruption, and, since
5368-518: The need to keep secret the American ability to decrypt Japanese radio traffic, the sensitive information went up the chain of command for a decision as to what actions the units in the field should take; ultimately President Franklin D. Roosevelt was said to have approved the action based on these intercepts, although this is not documented. Sixteen United States Army Air Forces P-38 Lightning fighters took off from Guadalcanal and intercepted and shot down
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#17328453342465456-521: The new town was partially built on a reclaimed mangrove swamp . At the outset of World War I , at the behest of Great Britain, Australia – as one of the Dominions of the British Empire – defeated the German military garrison in Rabaul and occupied the territory with the volunteer Australian Naval and Military Expeditionary Force . Following Germany's defeat at the end of the war, the occupied territory
5544-602: The number of mangrove lineages has increased steadily over the Tertiary with little global extinction. 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. "At
5632-400: The occupation by Japan, "Rabaul exploded violently [again] in 1994 and devastated the...[city]. Since then, the young cone Tavurvur located inside the caldera has been the site of near persistent activity in form of strombolian to vulcanian ash eruptions. The caldera has an elliptical form (14 × 9 km) and is surrounded by a steep volcanic ridge several hundred meters high." Under
5720-473: 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
5808-429: The past few years, bridging the research gap and expanding our knowledge towards the relationship between microbes mainly constituted of bacteria and its nutrient cycles in the mangrove sediment and direct and indirect impacts on mangrove growth and stand-structures as coastal barriers and other ecological service providers. Thus, based on studies by Lai et al.'s systematic review, here they suggest sampling improvements and
5896-927: The plant via root exudates , thus close associations between the plant and microbes are established for their mutual benefits. The taxonomic class level shows that most Proteobacteria were reported to come from Gammaproteobacteria, followed by Deltaproteobacteria and Alphaproteobacteria. The diverse function and the phylogenic variation of Gammaproteobacteria, which consisted of orders such as Alteromonadales and Vibrionales, are found in marine and coastal regions and are high in abundance in mangrove sediments functioning as nutrient recyclers. Members of Deltaproteobacteria found in mangrove soil are mostly sulfur-related, consisting of Desulfobacterales , Desulfuromonadales , Desulfovibrionales , and Desulfarculales among others. Highly diverse microbial communities (mainly bacteria and fungi ) have been found to inhabit and function in mangrove roots. For example, diazotrophic bacteria in
5984-450: The plant was exposed. In a frequently cited concept that has become known as the "sacrificial leaf", salt which does accumulate in the shoot (sprout) then concentrates in old leaves, which the plant then sheds. However, recent research on the Red mangrove Rhizophora mangle suggests that the older, yellowing leaves have no more measurable salt content than the other, greener leaves. Because of
6072-549: 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 . Different plant organs also have specific microbial communities depending on plant-associated factors (plant genotype, available nutrients, and organ-specific physicochemical conditions) and environmental conditions (associated with aboveground and underground surfaces and disturbances). Mangrove roots harbour
6160-731: The release of substantial amounts of organic carbon and nutrients from hosts and assist microbes in driving biogeochemical cycles with auxiliary metabolic genes (AMGs). It is presumed AMGs augment viral-infected host metabolism and facilitate the production of new viruses. AMGs have been extensively explored in marine cyanophages and include genes involved in photosynthesis, carbon turnover, phosphate uptake and stress response. 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. Interestingly,
6248-453: The rest of the plant. One study found that roots of the Indian mangrove Avicennia officinalis exclude 90% to 95% of the salt in water taken up by the plant, depositing the excluded salt in the cortex of the root. An increase in the production of suberin and in the activity of a gene regulating cytochrome P450 were observed in correlation with an increase in the salinity of the water to which
6336-411: The sediment due to the tidal flushing of mangrove forests. Termites play an important role in the formation of peat from mangrove materials. They process fallen leaf litter , root systems and wood from mangroves into peat to build their nests, and stabilise the chemistry of this peat that represents approximately 2% of above ground carbon storage in mangroves. As the nests are buried over time this carbon
6424-465: The soil like straws for breathing. These "breathing tubes" typically reach heights of up to 30 cm (12 in), and in some species, over 3 m (9.8 ft). The roots also contain wide aerenchyma to facilitate transport within the plants. 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
6512-503: The soil much less nutritious. 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. Red mangroves exclude salt by having significantly impermeable roots that are highly suberised (impregnated with suberin ), acting as an ultrafiltration mechanism to exclude sodium salts from
6600-727: The species chosen. The International Day for the Conservation of the Mangrove Ecosystem is celebrated every year on 26 July. Etymology of the English term mangrove can only be speculative and is disputed. The term may have come to English from the Portuguese mangue or the Spanish mangle . Further back, it may be traced to South America and Cariban and Arawakan languages such as Taíno . Other possibilities include
6688-445: The territorial headquarters at Rabaul were forestalled during World War II. Rabaul was heavily bombed by Japanese aircraft starting from 4 January 1942. On 23 January the battle of Rabaul began and Rabaul was captured shortly thereafter by thousands of Japanese naval landing forces . Rabaul was then bombed by Allied forces later that month. The military personnel, and most civilians who had remained in Rabaul, were placed aboard
6776-435: 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. About 110 species are considered mangroves, in the sense of being trees that grow in such a saline swamp, though only a few are from the mangrove plant genus, Rhizophora . However,
6864-460: The town was ready for evacuation when the volcanoes started to heat up. Nothing happened until 19 September 1994, when again Tavurvur and Vulcan erupted, destroying the airport and covering most of the town with heavy ashfall. There were only 19 hours of warning, but the city and most nearby villages were evacuated before the eruption. Five people were killed—one of them by lightning from the eruptive column. The planning and evacuation drills helped keep
6952-754: The tropical conditions of variable salinity, tidal range (inundation), anaerobic soils, and intense sunlight. Plant biodiversity is generally low in a given mangrove. The greatest biodiversity of mangroves occurs in Southeast Asia , particularly in the Indonesian archipelago . 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. The black mangrove ( Avicennia germinans ) lives on higher ground and develops many specialized root-like structures called pneumatophores , which stick up out of
7040-582: The two bombers of the Yamamoto flight, for the loss of one P-38. Instead of capturing Rabaul during their advance towards the Japanese Home islands, the Allied forces decided to bypass it by establishing a ring of airfields and naval bases on the islands around it. Cut off from re-supply and under continual air attacks as part of Operation Cartwheel , the base became useless. The neutralisation of Rabaul took until
7128-579: The vicinity of mangrove roots could perform biological nitrogen fixation , which provides 40–60% of the total nitrogen required by mangroves; the soil attached to mangrove roots lacks oxygen but is rich in organic matter, providing an optimal microenvironment for sulfate-reducing bacteria and methanogens , ligninolytic , cellulolytic , and amylolytic fungi are prevalent in the mangrove root environment; rhizosphere fungi could help mangroves survive in waterlogged and nutrient-restricted environments. These studies have provided increasing evidence to support
7216-631: 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 )." 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. The intertidal existence to which these trees are adapted represents
7304-403: 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. As a globally relevant component of the carbon cycle, mangroves sequester approximately 24 million metric tons of carbon each year. Most mangrove carbon
7392-537: The world. 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 km (53,100 sq mi), spanning 118 countries and territories. A 2022 study on losses and gains of tidal wetlands estimates a 3,700 km (1,400 sq mi) net decrease in global mangrove extent from 1999 to 2019. Mangrove loss continues due to human activity, with
7480-501: Was 17,044. However, Rabaul did not resume its pre-1937 role as capital, which was taken over by Port Moresby for the entirety of the two territories. Rabaul's magnificent harbour and central position meant it became a trading hub for the lively, and politically and economically developing New Guinea Islands region (East and West New Britain, New Ireland, Manus Island, and Bougainville). It retained that role when Papua New Guinea became independent from Australia in 1975. In 1983 and 1984
7568-458: Was a popular commercial and recreational boating destination; fewer private small craft visit now, but 10 to 12 cruise ships visit Rabaul each year, including the Queen Elizabeth , carrying up to 2,000 passengers. Tourism is a major industry in Rabaul and East New Britain generally. Rabaul's proximity to its volcanoes has always been a source of concern. In 1878, before it was established as
7656-568: Was captured by the British Empire during the early days of World War I . It became the capital of the Australian -mandated Territory of New Guinea until 1937, when it was first destroyed by a volcano. During World War II , it was captured by Japan in 1942 and became its main base of military and naval activity in the South Pacific . Settlements and military installations around the edge of
7744-497: Was delegated in 1920 to Australia as a League of Nations Mandate (Class C). Rabaul became the capital of the Territory of New Guinea . Visits to and stays in Rabaul during this period were amply described in books by many authors, including Margaret Mead . Gunantambu, the famous house of "Queen" Emma Forsayth and her husband, contained furniture previously owned by Robert Louis Stevenson and left to her family in Samoa. Destroyed in
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