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Mangrove crabs are crab
Crab

Crabs are Decapoda crustaceans of the infraorder Brachyura, which typically have a very short projecting "tail" , or where the reduced abdomen is entirely hidden under the thorax....
s that live among mangrove
Mangrove

Mangroves are trees and shrubs that grow in saline water coastal habitats in the tropics and subtropics. The word is used in at least three senses: most broadly to refer to the habitat and entire plant assemblage or mangal, for which the terms mangrove swamp and mangrove forest are also used, to refer to all trees and...
s, and may belong to many different species
Species

In biology, a species is one of the basic units of biological classification and a taxonomic rank. A species is often defined as a group of organisms capable of interbreeding and producing fertile offspring....
 and even families
Family (biology)

In biological classification, family is a taxonomic rank. Exact details of formal nomenclature depend on the Nomenclature Codes which applies....
. They have been shown to be ecologically
Ecology

Ecology is the science study of the distribution and Abundance of life and the interactions between organisms and their nature environment ....
 significant in many ways. They keep much of the energy within the forest
Forest

File:Stara planina suma.jpgA forest is an area with a high density of trees. There are many definitions of a forest, based on various criteria....
 by burying and consuming leaf litter. Furthermore, their feces
Feces

Feces, faeces, or f?ces is a waste product from an animal's gastrointestinal tract expelled through the anus during defecation....
 may form the basis of a coprophagous food chain contributing to mangrove secondary production (Lee, 1997; Gillikin et al., 2001). As mentioned in Robertson et al.






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Mangrove crabs are crab
Crab

Crabs are Decapoda crustaceans of the infraorder Brachyura, which typically have a very short projecting "tail" , or where the reduced abdomen is entirely hidden under the thorax....
s that live among mangrove
Mangrove

Mangroves are trees and shrubs that grow in saline water coastal habitats in the tropics and subtropics. The word is used in at least three senses: most broadly to refer to the habitat and entire plant assemblage or mangal, for which the terms mangrove swamp and mangrove forest are also used, to refer to all trees and...
s, and may belong to many different species
Species

In biology, a species is one of the basic units of biological classification and a taxonomic rank. A species is often defined as a group of organisms capable of interbreeding and producing fertile offspring....
 and even families
Family (biology)

In biological classification, family is a taxonomic rank. Exact details of formal nomenclature depend on the Nomenclature Codes which applies....
. They have been shown to be ecologically
Ecology

Ecology is the science study of the distribution and Abundance of life and the interactions between organisms and their nature environment ....
 significant in many ways. They keep much of the energy within the forest
Forest

File:Stara planina suma.jpgA forest is an area with a high density of trees. There are many definitions of a forest, based on various criteria....
 by burying and consuming leaf litter. Furthermore, their feces
Feces

Feces, faeces, or f?ces is a waste product from an animal's gastrointestinal tract expelled through the anus during defecation....
 may form the basis of a coprophagous food chain contributing to mangrove secondary production (Lee, 1997; Gillikin et al., 2001). As mentioned in Robertson et al. (1992), crab larva
Larva

A larva is a young form of animal with indirect developmental biology, going through or undergoing metamorphosis .The larva can look completely different from the adult form, for example, a caterpillar differs from a butterfly....
e are the major source of food for juvenile fish
Fish

A fish is any marine biology vertebrate animal that is typically ectothermic , covered with scale , and equipped with two sets of paired fins and several unpaired fins....
 inhabiting the adjacent waterways, indicating that crabs also help nearshore fisheries
Fishery

Generally, a fishery is a unit, engaged in raising and/or harvesting fish, which is determined by an authority or other entity to be a fishery....
. The crabs themselves are food for threatened species such as the Crab Plover
Crab Plover

The 'Crab Plover' is a bird related to the waders, but sufficiently distinctive to merit its own family 'Dromadidae'. Its relationship within the Charadriiformes is unclear , some have considered it to be closely related to the thick-knees, or the pratincoles, while others have considered it closer to the auks and gulls....
 (Seys et al., 1995; Zimmerman et al., 1996). Their burrows alter the topography
Topography

Topography is the study of Earth's surface shape and features or those ofplanets, Natural satellite, and asteroids. It is also the description of such surface shapes and features ....
 and sediment grain size of the mangrove (Warren and Underwood, 1986) and help aerate the sediment (Ridd, 1996). Smith et al. (1991) found that removing crabs from an area caused significant increases in sulfide
Sulfide

The term sulfide refers to several types of chemical compounds containing sulfur in its lowest oxidation number of −2.Formally, "sulfide" is the dianion, S2−, which exists in strongly alkaline aqueous solutions formed from H2S or alkali metal salts such as Li2S, Na2S, and K2...
s and ammonium
Ammonium

The ammonium cation is a positively electric charge polyatomic ion of the chemical formula NH4+. It has a formula weight of 18.05 and is formed by protonation of ammonia ....
 concentrations, which in turn affects the productivity and reproductive output of the vegetation. Their findings support the hypothesis that mangrove crabs are a keystone species
Keystone species

A keystone species is a species that has a disproportionate effect on its natural environment relative to its abundance. Such species affect many other organisms in an ecosystem and help to determine the types and numbers of various others species in a community....
. (for cited references see ).

See also

  • Crustacean
    Crustacean

    Crustaceans are a large group of arthropods, comprising almost 52,000 described species , and are usually treated as a subphylum . They include various familiar animals, such as crabs, lobsters, crayfish, shrimp, krill and barnacles....
  • Scylla serrata
    Scylla serrata

    Scylla serrata is an economically important crab species found in the estuary and mangroves of Africa, Australia and Asia. In their most common form, the shell colour varies from a deep, mottled green to very dark brown....
    , an Indo-Pacific
    Indo-Pacific

    The Indo-Pacific is a biogeography region of the earth's seas, comprising the tropical waters of the Indian Ocean, the western and central Pacific Ocean, and the seas connecting the two in the general area of Indonesia....
     mangrove crab
  • Perisesarma
    Perisesarma

    'Perisesarma' is a genus of mangrove crabs in the family Sesarmidae predominantly found in the Indo-Pacific. There are 23 species as of late 2006 with two from west Africa: P....


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