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Cospeciation
Cospeciation is a form of coevolution in which the speciation of one species dictates speciation of another species and is most commonly studied in host-parasite relationships. In the case of a host-parasite relationship, if two hosts of the same species get within close proximity of each other, parasites of the same species from each host are able to move between individuals and mate with the parasites on the other host. However, if a speciation event occurs in the host species, the parasites will no longer be able to "cross over" because the two new host species no longer mate and, if the speciation event is due to a geographic separation, it is very unlikely the two hosts will interact at all with each other. The lack of proximity between the hosts ultimately prevents the populations of parasites from interacting and mating. This can ultimately lead to speciation within the parasite. According to Fahrenholz's rule, first proposed by Heinrich Fahrenholz in 1913, when host-parasit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cospeciation (5 Processes) - With Key
Cospeciation is a form of coevolution in which the speciation of one species dictates speciation of another species and is most commonly studied in host-parasite relationships. In the case of a host-parasite relationship, if two hosts of the same species get within close proximity of each other, parasites of the same species from each host are able to move between individuals and mate with the parasites on the other host. However, if a speciation event occurs in the host species, the parasites will no longer be able to "cross over" because the two new host species no longer mate and, if the speciation event is due to a geographic separation, it is very unlikely the two hosts will interact at all with each other. The lack of proximity between the hosts ultimately prevents the populations of parasites from interacting and mating. This can ultimately lead to speciation within the parasite. According to Fahrenholz's rule, first proposed by Heinrich Fahrenholz in 1913, when host-parasit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Parasite
Parasitism is a close relationship between species, where one organism, the parasite, lives on or inside another organism, the host, causing it some harm, and is adapted structurally to this way of life. The entomologist E. O. Wilson has characterised parasites as "predators that eat prey in units of less than one". Parasites include single-celled protozoans such as the agents of malaria, sleeping sickness, and amoebic dysentery; animals such as hookworms, lice, mosquitoes, and vampire bats; fungi such as Armillaria mellea, honey fungus and the agents of ringworm; and plants such as mistletoe, dodder, and the Orobanchaceae, broomrapes. There are six major parasitic Behavioral ecology#Evolutionarily stable strategy, strategies of exploitation of animal hosts, namely parasitic castration, directly transmitted parasitism (by contact), wikt:trophic, trophicallytransmitted parasitism (by being eaten), Disease vector, vector-transmitted parasitism, parasitoidism, and micropreda ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fig Wasp
Fig wasps are wasps of the superfamily Chalcidoidea which spend their larval stage inside figs. Most are pollinators but others simply feed off the plant. The non-pollinators belong to several groups within the superfamily Chalcidoidea, while the pollinators are in the family Agaonidae. While pollinating fig wasps are gall-makers, the remaining types either make their own galls or usurp the galls of other fig wasps; reports of their being parasitoids are considered dubious. History Aristotle recorded in his ''History of Animals'' that the fruits of the wild fig (the caprifig) contain ''psenes'' (fig wasps); these begin life as grubs (larvae), and the adult ''psen'' splits its "skin" (pupa) and flies out of the fig to find and enter a cultivated fig, saving it from dropping. He believed that the ''psen'' was generated spontaneously; he did not recognise that the fig was reproducing sexually and that the ''psen'' was assisting in that process. Taxonomy The fig wasps are a pol ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Host Switch
In parasitology and epidemiology, a host switch (or host shift) is an evolutionary change of the host specificity of a parasite or pathogen. For example, the human immunodeficiency virus used to infect and circulate in non-human primates in West-central Africa, but switched to humans in the early 20th century. All symbiotic species, such as parasites, pathogens and mutualists, exhibit a certain degree of host specificity. This means that pathogens are highly adapted to infect a specific host - in terms of but not limited to receptor binding, countermeasures for host restriction factors and transmission methods. They occur in the body (or on the body surface) of a single host species or – more often – on a limited set of host species. In the latter case, the suitable host species tend to be taxonomically related, sharing similar morphology and physiology. Speciation is the creation of a new and distinct species through evolution and so unique differences exist between all life ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ficus
''Ficus'' ( or ) is a genus of about 850 species of woody trees, shrubs, vines, epiphytes and hemiepiphytes in the family Moraceae. Collectively known as fig trees or figs, they are native throughout the tropics with a few species extending into the semi-warm temperate zone. The common fig (''F. carica'') is a temperate species native to southwest Asia and the Mediterranean region (from Afghanistan to Portugal), which has been widely cultivated from ancient times for its fruit, also referred to as figs. The fruit of most other species are also edible though they are usually of only local economic importance or eaten as bushfood. However, they are extremely important food resources for wildlife. Figs are also of considerable cultural importance throughout the tropics, both as objects of worship and for their many practical uses. Description ''Ficus'' is a pantropical genus of trees, shrubs, and vines occupying a wide variety of ecological niches; most are evergreen, bu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Buchnera (plant)
''Buchnera'' is a genus of flowering plants belonging to the family Orobanchaceae. Its native range is Northern and Tropical America, Tropical and Southern Africa, Madagascar, Arabian Peninsula Tropical Asia, Australia. Species: *'' Buchnera affinis'' *'' Buchnera albiflora'' *'' Buchnera americana'' *'' Buchnera amethystina'' *'' Buchnera andongensis'' *'' Buchnera androsacea'' *'' Buchnera angustissima'' *'' Buchnera arenicola'' *'' Buchnera asperata'' *'' Buchnera attenuata'' *'' Buchnera bampsiana'' *'' Buchnera bangweolensis'' *'' Buchnera baumii'' *'' Buchnera benthamiana'' *''Buchnera bequaertii'' *'' Buchnera bowalensis'' *'' Buchnera bragaana'' *'' Buchnera buchneroides'' *''Buchnera bukamensis'' *''Buchnera cambodiana'' *''Buchnera candida'' *''Buchnera capitata'' *''Buchnera carajasensis'' *''Buchnera chimanimaniensis'' *''Buchnera chisumpae'' *''Buchnera ciliata'' *''Buchnera ciliolata'' *''Buchnera congoensis'' *'' Buchnera convallicola'' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Macaranga
''Macaranga'' is a large genus of Old World tropical trees of the family Euphorbiaceae and the only genus in the subtribe Macaranginae (tribe Acalypheae). Native to Africa, Australasia, Asia and various islands of the Indian and Pacific Oceans, the genus comprises over 300 different species. It was first described as a genus in 1806, based on specimens collected on the Island of Mauritius. ''Macaranga'' is noted for being recolonizers. ''Macaranga'' species are used as food plants by the larvae of some Lepidoptera species including ''Endoclita malabaricus''. ''Macaranga'' species often form symbioses with ant ( Formicidae) species (particularly ''Crematogaster'' ants of the subgenus '' Decacrema'') because they have hollow stems that can serve as nesting space and occasionally provide nectar. The trees benefit because the ants attack herbivorous insects and either drive them away or feed on them. Use * Macaranga gum, a crimson resin, is obtained from '' Macaranga indica''. * ''M ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Crematogaster
''Crematogaster'' is an ecologically diverse genus of ants found worldwide, which are characterised by a distinctive heart-shaped gaster (abdomen), which gives them one of their common names, the Saint Valentine ant. Members of this genus are also known as cocktail ants because of their habit of raising their abdomens when alarmed. Most species are arboreal (tree-dwelling). These ants are sometimes known as acrobat ants. Acrobat ants acquire food largely through predation on other insects, such as wasps.Schatz, Bertrand, and Martine Hossaert-Mckey. "Interactions of the Ant Crematogaster Scutellaris with the Fig/fig Wasp Mutualism." Ecological Entomology 28.3 (2003): 359-68. Print. They use venom to stun their prey and a complex trail-laying process to lead comrades to food sources. Like most ants, ''Crematogaster'' species reproduce by partaking in nuptial flights, where the queen acquires the sperm used to fertilize every egg throughout her life. Predatory behavior Acrobat ant ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dendroctonus
''Dendroctonus'' is a genus of bark beetles. It includes several species notorious for destroying trees in the forests of North America. The genus has a symbiotic relationship with many different yeasts, particularly those in the genera '' Candida'' and ''Pichia'' that aid in digestion and pheromone production. Species include: *'' Dendroctonus adjunctus'' - roundheaded pine beetle *''Dendroctonus approximatus'' - Mexican pine beetle *''Dendroctonus barberi -'' southwestern pine beetle *'' Dendroctonus brevicomis'' - western pine beetle *''Dendroctonus frontalis'' - southern pine beetle *'' Dendroctonus jeffreyi'' - Jeffrey pine beetle *''Dendroctonus mesoamericanus'' - Mesoamerican pine beetle *''Dendroctonus mexicanus'' - smaller Mexican pine beetle *''Dendroctonus micans'' - great spruce bark beetle *'' Dendroctonus murrayanae'' - lodgepole pine beetle *''Dendroctonus parallelocollis'' - larger Mexican pine beetle *''Dendroctonus ponderosae'' - mountain pine beetle *''Dendroc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bacteria
Bacteria (; singular: bacterium) are ubiquitous, mostly free-living organisms often consisting of one biological cell. They constitute a large domain of prokaryotic microorganisms. Typically a few micrometres in length, bacteria were among the first life forms to appear on Earth, and are present in most of its habitats. Bacteria inhabit soil, water, acidic hot springs, radioactive waste, and the deep biosphere of Earth's crust. Bacteria are vital in many stages of the nutrient cycle by recycling nutrients such as the fixation of nitrogen from the atmosphere. The nutrient cycle includes the decomposition of dead bodies; bacteria are responsible for the putrefaction stage in this process. In the biological communities surrounding hydrothermal vents and cold seeps, extremophile bacteria provide the nutrients needed to sustain life by converting dissolved compounds, such as hydrogen sulphide and methane, to energy. Bacteria also live in symbiotic and parasitic relationsh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chemoautotroph
A Chemotroph is an organism that obtains energy by the oxidation of electron donors in their environments. These molecules can be organic (chemoorganotrophs) or inorganic (chemolithotrophs). The chemotroph designation is in contrast to phototrophs, which use photons. Chemotrophs can be either autotrophic or heterotrophic. Chemotrophs can be found in areas where electron donors are present in high concentration, for instance around hydrothermal vents. Chemoautotroph Chemoautotrophs, in addition to deriving energy from chemical reactions, synthesize all necessary organic compounds from carbon dioxide. Chemoautotrophs can use inorganic energy sources such as hydrogen sulfide, elemental sulfur, ferrous iron, molecular hydrogen, and ammonia or organic sources to produce energy. Most chemoautotrophs are extremophiles, bacteria or archaea that live in hostile environments (such as deep sea vents) and are the primary producers in such ecosystems. Chemoautotrophs generally fall into se ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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