Mangroves are trees and shrubs that grow in saline coastal habitats in the tropics and subtropics – mainly between latitudes 25° N and 25° S. The saline conditions tolerated by various species range from brackish water, through pure seawater (30 to 40 ppt), to water of over twice the salinity of ocean seawater, where the salt has become concentrated by evaporation (up to 90 ppt).[1][2]
The many species of trees and shrubs adapted to saline conditions are not all closely related, and the term "mangrove" may be used for all of them, or more narrowly only for the mangrove family of plants, the Rhizophoraceae, or even more specifically just for mangrove trees of the genus Rhizophora.
Mangroves form a characteristic saline woodland or
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Shrimps and mud lobsters use the muddy bottom as their home.[10] Mangrove crabs mulch the mangrove leaves, adding nutritients to the mangal muds for other bottom feeders.[11] In at least some cases, export of carbon fixed in mangroves is important in coastal food webs.
Mangrove plantations in Vietnam, Thailand, the Philippines and India host several commercially important species of fish and crustaceans. Despite restoration efforts, developers and others have removed over half of the world's mangroves in recent times.
[edit] Biology
A red mangrove, Rhizophora mangle
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.[3] 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 mangal.[1] This is especially true in higher latitudes and in the Americas. The greatest biodiversity occurs in the mangal of New Guinea, Indonesia and Malaysia.[12]
[edit] Adaptations to low oxygen
Pneumatophore penetrates the sand surrounding the mangrove tree.
Red mangroves, which can survive in the most inundated areas, prop
Mangroves are halophyte plants that are physiologically amended to survive in habitat containing high concentration of salt in the soil water even though salt is not a physical requirement for growth; hence they are facultative halophytes (Dictionary, 2015). Mangroves at Nudgee Beach have developed three special mechanisms to manage the excess salt levels in their environment due to the disability of enzymes function at high salt concentration. Each species of mangroves are able to either: exclude (prevent salt entering), extrude (take salt out) or accumulate large amounts sodium chloride, enabling them to survive in their ecosystem (University of Sydney, 2015). Some species of mangrove have more than one of the above characteristics. The process
It is predicted that the distribution and the abundance of both the animals and plants of the mangroves ecosystem would differ depending on the locations and the effects of the abiotic factors.
Mangrove Forest is another type of ecosystem in South Texas. Mangrove Forests are found along the coast in salty waters and the general abiotic conditions are high salinity flooded soils, low wave energy, high temperatures, and muddy soils. Black Mangrove and Buttonwood are the dominant plant species in South Texas Mangrove Forest ecosystem. Buttonwood is adapted to this ecosystem because it resides inland where there is less salty conditions. Black Mangrove is adapted to sandy salty clay soil and requires protection from wave action and they are sensitive to cold weather. Some common animal species that live in Mangrove Forests are many species of fish, crabs, mollusks, and birds. Mangrove forests provide a habitat, shelter, and nursery to these species that reside in this ecosystem. Mangrove forest serve as a coastal protection from severe storms and hurricanes also help remove pollutants and erosion. The economic importance of Mangrove forest is that they support fisheries, water purification, tourism, and coastal protection. Human activities pose a threat to Mangrove Forests because of the removal of some mangroves, boat waves, oil spills, dredging, draining, and diking.
Zonation is the distribution of animals and plants into specific zones according to abiotic factors and characterised by its dominant species [15]. Mangrove zonation is the distinguishable categorisation of a mangrove ecosystem that extends from shore to inland regions. Definitive spatial variation of mangrove species has been recognised amongst different ecosystems worldwide and is accredited as being influenced by abiotic and environmental factors [16]. In Eastern Australia, the majority of mangrove forests may be divided into landward, middle and seaward zones, based off of their placement in relation to tidal position. The following points represent the typical physiognomies characterised by mangroves in their corresponding zones:
Mangroves are trees and shrubs forming forests on the coastal wetlands, typically growing between saltmarsh and seagrass beds. Sydney Olympic park is the main habitat for the grey Mangrove and the planted river
Oak trees, bald cypress trees, and Spanish moss are just some of the prominent plants which grow here. These plants are native because they grow naturally in these types of wetlands.
The Chaparral and Coastal Sage Scrub have a variety of different plant species, from Torrey Pine to Cacti. They each contain some helpful adaptations that have resulted from directional selection over
While vegetation is quite sparse on the beach, the forest can get quite lush. The flora in the area can range from medium sized bushes to fully grown trees. The cassowary plum and small screw pines are common. Ginger trees are also seen. The burrawang palms grow around the areas near the ocean.
Furthermore, extraction of building materials such as sand affects coral reefs, mangroves, and hinterland forests, leading to erosion and destruction of habitats. Overbuilding and extensive paving of shorelines can result in destruction of habitats and disruption of land-sea connections such as sea-turtle nesting spots. Coral reefs are especially fragile marine ecosystems and are suffering worldwide from reef-based tourism developments. Evidence suggests a variety of impacts to coastline ecosystems result from shoreline development, increased sediments in the water, trampling by tourists and divers, ship groundings, pollution from sewage, overfishing, and fishing with poisons and explosives that destroy coral
Large variety of plants that the Daintree Rainforest is considered a jungle including 390 rare plants
There are many organisms living, thriving and surviving off of the mangrove forests. Mangroves are always being affected by natural and unnatural factors that create significant threats to this precious ecosystem (Mangrove Watch, 2016). The natural factors can occur seasonally, annually and periodically, with severe events including cyclones and anything else that affects all biotic (living) and abiotic (non-living)
There are many biotic features of the wetlands and these include the Pampas grass, the elm (both of these are seriously terrestrial weed species). There are also other varying biotic factors such as the diversity and quantity of the plants and animals found there. (Tpwd.texas.gov)
Crossing the Mangrove by Maryse Condé first published in 1989, offers a fitting representation of French Caribbean history and culture. The novel stands out for its celebration of diversity and the concept of root identity throughout French Caribbean society. Condé’s novel reflects on the people living in Guadeloupe and the complex system that colonialism has created in the Caribbean. Also, it links the créolité movement from its counterpart Negritude and demonstrates how it shapes the identity of individuals living in the French Caribbean. The population of Rivière au Sel exemplifies the mixture of Guadeloupian people and how they interact with each other in a small community. Countless waves of immigrates to the Caribbean have brought African, East Indian, Europeans, Asians and other racial groups to live in close proximity to each other in Guadeloupe. In Praise of Creoleness, it explains the emergences of créolité and how it is a metaphor for a unique Caribbean identity completely separated from other movement in the Caribbean.
Seagrasses are essential primary producers that provide habitat and refuge to fauna. Anthropogenic influences have caused global loss of seagrasses and a major contributor is eutrophication, which increases phytoplankton and algal populations, reduces light availability, and causes daily hypoxic conditions. Eutrophication is commonly linked to declines in temperate conditions and is more difficult to link to tropical systems since decreases are typically related to physical damage and diminishing light conditions from runoff. Climate change, herbivore declines, disease and overfishing, along with anthropogenic impacts from coastal development, run-off, eutrophication, and aquaculture have caused declines in coral reefs and mangrove systems. These three systems are interconnected and when one system is impacted, secondary impacts are observed in the other systems; coastal ecosystems will be adversely effected and decline. Additional research, conservation, and ways to reduce anthropogenic impacts have been discussed. Restoration is used to reverse habitat loss, although success is varied. Coastal systems and the biological and ecosystem services they provide, may take decades to establish. Marine Protected Areas (MPAs) are instituted to protect systems from further degradation, restore communities and allow them to flourish naturally. However, local residents are affected by MPAs and may become displaced, have restriction placed on their livelihood, or elimination of their
The plants that grow in saline soils have diverse ionic compositions and a range in concentrations of dissolved salts (Volkmar et al., 1998). These concentrations fluctuate because of changes in water source, drainage, evapo-transpiration, and solute availability (Volkmar et al., 1998). Due to these varying conditions, plant growth depends on a supply of inorganic nutrients, and this level of nutrients varies in time and space (Maathius and Amtmann, 1999). Either extreme condition concerning nutrients results in deficiency or toxicity in plants, and this is demonstrated by salt tolerance (Maathius and Amtmann, 1999). These conditions vary according to the plant species and growth conditions. Little is known about the genetic basis for diversity of salt tolerance in plants, and this could be partly explained through the definitions given for salinity.