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lable water the most extreme arid habitats are deserts desert animals have a variety of adaptations to survive the dry conditions some frogs live in deserts creating moist habitat types underground and hibernating while conditions are adverse couch s spadefoot toad scaphiopus couchii emerges from its burrow when a downpour occurs and lays its eggs in the transient pools that form the tadpoles develop with great rapidity sometimes in as little as nine days undergo metamorphosis and feed voraciously before digging a burrow of their own 14 list of arid habitat types edit desert fog desert polar desert steppe savanna wetland and riparian edit other organisms cope with the drying up of their aqueous habitat in other ways vernal pools are ephemeral ponds that form in the rainy season and dry up afterwards they have their specially adapted characteristic flora mainly consisting of annuals the seeds of which survive the drought but also some uniquely adapted perennials 15 animals adapted to these extreme habitat types also exist fairy shrimps can lay winter eggs which are resistant to desiccation sometimes being blown about with the dust ending up in new depressions in the ground these can survive in a dormant state for as long as fifteen years 16 some killifish behave in a similar way their eggs hatch and the juvenile fish grow with great rapidity when the conditions are right but the whole population of fish may end up as eggs in diapause in the dried up mud that was once a pond 17 examples of wetland and riparian habitat types edit bog marsh fen flooded grasslands and savannas floodplain shrub swamp swamp vernal pool wet meadow forest edit examples of forest habitat types edit boreal forest cloud forest peat swamp forest temperate coniferous forest temperate deciduous forest temperate rain forest thorn forest tropical dry forest tropical moist forest tropical rain forest woodland freshwater edit wetland habitat types in borneo freshwater habitat types include rivers streams lakes ponds marshes and bogs 18 they can be divided into running waters rivers streams and standing waters lakes ponds marshes bogs 19 although some organisms are found across most of these habitat types the majority have more specific requirements the water velocity its temperature and oxygen saturation are important factors but in river systems there are fast and slow sections pools bayous and backwaters which provide a range of habitat types similarly aquatic plants can be floating semi submerged submerged or grow in permanently or temporarily saturated soils besides bodies of water marginal plants provide important habitat for both invertebrates and vertebrates and submerged plants provide oxygenation of the water absorb nutrients and play a part in the reduction of pollution 20 marine edit marine habitats include brackish water estuaries bays the open sea the intertidal zone the seabed reefs and deep shallow water zones 18 further variations include rock pools sand banks mudflats brackish lagoons sandy and pebbly beaches and seagrass beds all supporting their own flora and fauna the benthic zone or seabed provides a home for both static organisms anchored to the substrate and for a large range of organisms crawling on or burrowing into the surface some creatures float among the waves on the surface of the water or raft on floating debris others swim at a range of depths including organisms in the demersal zone close to the seabed and myriads of organisms drift with the currents and form the plankton 21 list of marine habitat types edit abyssal plain aphotic zone benthic zone cold seep coral reef demersal zone estuary hydrothermal vent intertidal zone kelp forest littoral zone oceanic trench photic zone seagrass meadow mangrove swamp seamount tide pool urban edit many animals and plants have taken up residence in urban environments they tend to be adaptable generalists and use the town s features to make their homes rats and mice have followed man around the globe pigeons peregrines sparrows swallows and house martins use the buildings for nesting bats use roof space for roosting foxes visit the garbage bins and squirrels coyotes raccoons and skunks roam the streets about 2 000 coyotes are thought to live in and around chicago 22 a survey of dwelling houses in northern european cities in the twentieth century found about 175 species of invertebrate inside them including 53 species of beetle 21 flies 13 butterflies and moths 13 mites 9 lice 7 bees 5 wasps 5 cockroaches 5 spiders 4 ants and a number of other groups 23 in warmer climates termites are serious pests in the urban habitat 183 species are known to affect buildings and 83 species cause serious structural damage 24 microhabitat types edit microhabitat redirects here for the south korean film see microhabitat film the leaves of an alnus nepalensis tree provide a microhabitat for species like the leaf beetle aulacophora indica a microhabitat consists of the small scale physical requirements of a particular organism or population every habitat includes large numbers of microhabitat types with subtly different exposure to light humidity temperature air movement and other factors the lichens that grow on the north face of a boulder are different from those that grow on the south face from those on the level top and those that grow on the ground nearby the lichens growing in the grooves and on the raised surfaces are different from those growing on the veins of quartz lurking among these miniature forests are the microfauna species of invertebrate each with its own specific habitat requirements 25 there are numerous different microhabitat types in a wood coniferous forest broad leafed forest open woodland scattered trees woodland verges clearings and glades tree trunk branch twig bud leaf flower and fruit rough bark smooth bark damaged bark rotten wood hollow groove and hole canopy shrub layer plant layer leaf litter and soil buttress root stump fallen log stem base grass tussock fungus fern and moss 26 the greater the structural diversity in the wood the greater the number of microhabitat types that will be present a range of tree species with individual specimens of varying sizes and ages and a range of features such as streams level areas slopes tracks clearings and felled areas will provide suitable conditions for an enormous number of biodiverse plants and animals for example in britain it has been estimated that various types of rotting wood are home to over 1700 species of invertebrate 26 for a parasitic organism its habitat is the particular part of the outside or inside of its host on or in which it is adapted to live the life cycle of some parasites involves several different host species as well as free living life stages sometimes within vastly different microhabitat types 27 one such organism is the trematode flatworm microphallus turgidus present in brackish water marshes in the southeastern united states its first intermediate host is a snail and the second a glass shrimp the final host is the waterfowl or mammal that consumes the shrimp 28 extreme habitat types edit main article extremophile an antarctic rock split apart to show endolithic lifeforms showing as a green layer a few millimeters thick although the vast majority of life on earth lives in mesophyllic moderate environments a few organisms most of them microbes have managed to colonise extreme environments that are unsuitable for more complex life forms there are bacteria for example living in lake whillans half a mile below the ice of antarctica in the absence of sunlight they must rely on organic material from elsewhere perhaps decaying matter from glacier melt water or minerals from the underlying rock 29 other bacteria can be found in abundance in the mariana trench the deepest place in the ocean and on earth marine snow drifts down from the surface layers of the sea and accumulates in this undersea valley providing nourishment for an extensive community of bacteria 30 other microbes live in environments lacking in oxygen and are dependent on chemical reactions other than photosynthesis boreholes drilled 300 m 1 000 ft into the rocky seabed have found microbial communities apparently based on the products of reactions between water and the constituents of rocks these communities have not been studied much but may be an important part of the global carbon cycle 31 rock in mines two miles deep also harbour microbes these live on minute traces of hydrogen produced in slow oxidizing reactions inside the rock these metabolic reactions allow life to exist in places with no oxygen or light an environment that had previously been thought to be devoid of life 32 33 the intertidal zone and the photic zone in the oceans are relatively familiar habitat types however the vast bulk of the ocean is inhospitable to air breathing humans with scuba divers limited to the upper 50 m 160 ft or so 34 the lower limit for photosynthesis is 100 to 200 m 330 to 660 ft and below that depth the prevailing conditions include total darkness high pressure little oxygen in some places scarce food resources and extreme cold this habitat is very challenging to research and as well as being little studied it is vast with 79 of the earth s biosphere being at depths greater than 1 000 m 3 300 ft 35 with no plant life the animals in this zone are either detritivores reliant on food drifting down from surface layers or they are predators feeding on each other some organisms are pelagic swimming or drifting in mid ocean while others are benthic living on or near the seabed their growth rates and metabolisms tend to be slow their eyes may be very large to detect what little illumination there is or they may be blind and rely on other sensory inputs a number of deep sea creatures are bioluminescent this serves a variety of functions including predation protection and social recognition 35 in general the bodies of animals living at great depths are adapted to high pressure environments by having pressure resistant biomolecules and small organic molecules present in their cells known as piezolytes which give the proteins the flexibility they need there are also unsaturated fats in their membranes which prevent them from solidifying at low temperatures 36 dense mass of white crabs at a hydrothermal vent with stalked barnacles on right hydrothermal vents were first discovered in the ocean depths in 1977 37 they result from seawater becoming heated after seeping through cracks to places where hot magma is close to the seabed the under water hot springs may gush forth at temperatures of over 340 c 640 f and support unique communities of organisms in their immediate vicinity 37 the basis for this teeming life is chemosynthesis a process by which microbes convert such substances as hydrogen sulfide or ammonia into organic molecules 38 these bacteria and archaea are the primary producers in these ecosystems and support a diverse array of life about 350 species of organism dominated by molluscs polychaete worms and crustaceans had been discovered around hydrothermal vents by the end of the twentieth century most of them being new to science and endemic to these habitat types 39 besides providing locomotion opportunities for winged animals and a conduit for the dispersal of pollen grains spores and seeds the atmosphere can be considered to be a habitat type in its own right there are metabolically active microbes present that actively reproduce and spend their whole existence airborne with hundreds of thousands of individual organisms estimated to be present in a cubic meter of air the airborne microbial community may be as diverse as that found in soil or other terrestrial environments however these organisms are not evenly distributed their densities varying spatially with altitude and environmental conditions aerobiology has not been studied much but there is evidence of nitrogen fixation in clouds and less clear evidence of carbon cycling both facilitated by microbial activity 40 there are other examples of extreme habitat types where specially adapted lifeforms exist tar pits teeming with microbial life 41 naturally occurring crude oil pools inhabited by the larvae of the petroleum fly 42 hot springs where the temperature may be as high as 71 c 160 f and cyanobacteria create microbial mats 43 cold seeps where the methane and hydrogen sulfide issue from the ocean floor and support microbes and higher animals such as mussels which form symbiotic associations with these anaerobic organisms 44 salt pans that harbour salt tolerant bacteria archaea and also fungi such as the black yeast hortaea werneckii and basidiomycete wallemia ichthyophaga 45 46 ice sheets in antarctica which support fungi thelebolus spp 45 glacial ice with a variety of bacteria and fungi 47 and snowfields on which algae grow 48 habitat change edit twenty five years after the devastating eruption at mount st helens united states pioneer species have moved in whether from natural processes or the activities of man landscapes and their associated habitat types change over time there are the slow geomorphological changes associated with the geologic processes that cause tectonic uplift and subsidence and the more rapid changes associated with earthquakes landslides storms flooding wildfires coastal erosion deforestation and changes in land use 49 then there are the changes in habitat types brought on by alterations in farming practices tourism pollution fragmentation and climate change 50 loss of habitat is the single greatest threat to any species if an island on which an endemic organism lives becomes uninhabitable for some reason the species will become extinct any type of habitat surrounded by a different habitat is in a similar situation to an island if a forest is divided into parts by logging with strips of cleared land separating woodland blocks and the distances between the remaining fragments exceed the distance an individual animal is able to travel that species becomes especially vulnerable small populations generally lack genetic diversity and may be threatened by increased predation increased competition disease and unexpected catastrophe 50 at the edge of each forest fragment increased light encourages secondary growth of fast growing species and old growth trees are more vulnerable to logging as access is improved the birds that nest in their crevices the epiphytes that hang from their branches and the invertebrates in the leaf litter are all adversely affected and biodiversity is reduced 50 habitat fragmentation can be ameliorated to some extent by the provision of wildlife corridors connecting the fragments these can be a river ditch strip of trees hedgerow or even an underpass to a highway without the corridors seeds cannot disperse and animals especially small ones cannot travel through the hostile territory putting populations at greater risk of local extinction 51 habitat dist...
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