79-470: The Wet Tropics of Queensland World Heritage Site consists of approximately 8,940 km of Australian wet tropical forests growing along the north-east Queensland portion of the Great Dividing Range . The Wet Tropics of Queensland meets all four of the criteria for natural heritage for selection as a World Heritage Site. World Heritage status was declared in 1988, and on 21 May 2007
158-464: A carbohydrate energy source. The carbohydrate source can be combinations of discrete sugars or can be derived from other sources such as banana , pineapple , peach , or even tomato puree or coconut water . After the preparation of the agar medium, it is poured into test tubes or jars which are then autoclaved (or cooked in a pressure cooker) to sterilize the medium. After cooking, the medium begins to gel as it cools. The taxonomy of this family
237-401: A seta , knocking the pollinator off the flower. After pollination, the sepals and petals fade and wilt, but they usually remain attached to the ovary. In 2011, Bulbophyllum nocturnum was discovered to flower nocturnally. Some species, such as in the genera Phalaenopsis , Dendrobium , and Vanda , produce offshoots or plantlets formed from one of the nodes along the stem , through
316-480: A spur of the labellum ( 8 in the illustration above), or on the point of the sepals, or in the septa of the ovary, the most typical position amongst the Asparagales . In orchids that produce pollinia, pollination happens as some variant of the following sequence: when the pollinator enters into the flower, it touches a viscidium, which promptly sticks to its body, generally on the head or abdomen. While leaving
395-551: A velamen , has the function of absorbing humidity. It is made of dead cells and can have a silvery-grey, white or brown appearance. In some orchids, the velamen includes spongy and fibrous bodies near the passage cells, called tilosomes. The cells of the root epidermis grow at a right angle to the axis of the root to allow them to get a firm grasp on their support. Nutrients for epiphytic orchids mainly come from mineral dust, organic detritus, animal droppings and other substances collecting among on their supporting surfaces. The base of
474-417: A UNESCO report titled "World Heritage and Tourism in a Changing Climate". The Australian government's actions, involving considerable expense for lobbying and visits for diplomats , were in response to their concern about the negative impact that an "at risk" label could have on tourism revenue at a previously designated UNESCO World Heritage Site. In 2021, international scientists recommended UNESCO to put
553-571: A World Heritage Site is nominated by its host country and determined by the UNESCO's World Heritage Committee to be a unique landmark which is geographically and historically identifiable, having a special cultural or physical significance, and to be under a sufficient system of legal protection. For example, World Heritage Sites might be ancient ruins or historical structures, buildings, cities, deserts, forests, islands, lakes, monuments, mountains or wilderness areas. A World Heritage Site may signify
632-478: A different species of bee, so as to enforce proper cross-pollination. A rare achlorophyllous saprophytic orchid growing entirely underground in Australia, Rhizanthella slateri , is never exposed to light, and depends on ants and other terrestrial insects to pollinate it. Catasetum , a genus discussed briefly by Darwin , actually launches its viscid pollinia with explosive force when an insect touches
711-823: A diverse and widespread group of flowering plants with blooms that are often colourful and fragrant. Orchids are cosmopolitan plants that are found in almost every habitat on Earth except glaciers . The world's richest diversity of orchid genera and species is found in the tropics . Orchidaceae is one of the two largest families of flowering plants, along with the Asteraceae . It contains about 28,000 currently accepted species distributed across 763 genera . The Orchidaceae family encompasses about 6–11% of all species of seed plants . The largest genera are Bulbophyllum (2,000 species), Epidendrum (1,500 species), Dendrobium (1,400 species) and Pleurothallis (1,000 species). It also includes Vanilla (the genus of
790-488: A minor boundary change, one that does not have a significant impact on the extent of the property or affect its "outstanding universal value", is also evaluated by the advisory bodies before being sent to the committee. Such proposals can be rejected by either the advisory bodies or the Committee if they judge it to be a significant change instead of a minor one. Proposals to change a site's official name are sent directly to
869-756: A remarkable accomplishment of humankind and serve as evidence of our intellectual history on the planet, or it might be a place of great natural beauty. As of July 2024, a total of 1,223 World Heritage Sites (952 cultural, 231 natural and 40 mixed cultural and natural properties) exist across 168 countries . With 60 selected areas, Italy is the country with the most sites, followed by China with 59, and Germany with 54. The sites are intended for practical conservation for posterity, which otherwise would be subject to risk from human or animal trespassing, unmonitored, uncontrolled or unrestricted access, or threat from local administrative negligence. Sites are demarcated by UNESCO as protected zones. The World Heritage Sites list
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#1732772758623948-455: A semiterrestrial or rock-hugging (" lithophyte ") orchid, show a sparkling silver and gold veining on a light green background. The cordate leaves of Psychopsiella limminghei are light brownish-green with maroon-puce markings, created by flower pigments. The attractive mottle of the leaves of lady's slippers from tropical and subtropical Asia ( Paphiopedilum ), is caused by uneven distribution of chlorophyll. Also, Phalaenopsis schilleriana
1027-426: A significant threat to some endangered ecosystems. Some are fragmented and their natural vegetation is degraded. Invasive pest species are another concern along with internal fragmentation by road and power lines. Insect and mite species are of particular concern because some of them are hard to detect. Some areas are off-limits to the general public to prevent the introduction of Phytophthora . The southern cassowary
1106-538: A single mass. Each time pollination succeeds, thousands of ovules can be fertilized. Pollinators are often visually attracted by the shape and colours of the labellum. However, some Bulbophyllum species attract male fruit flies ( Bactrocera and Zeugodacus spp.) solely via a floral chemical which simultaneously acts as a floral reward (e.g. methyl eugenol , raspberry ketone , or zingerone ) to perform pollination. The flowers may produce attractive odours. Although absent in most species, nectar may be produced in
1185-1000: A single text was eventually agreed upon by all parties, and the Convention Concerning the Protection of the World Cultural and Natural Heritage was adopted by the General Conference of UNESCO on 16 November 1972. The convention came into force on 17 December 1975. As of November 2024, it has been ratified by 196 states: 192 UN member states , two UN observer states (the Holy See and the State of Palestine ), and two states in free association with New Zealand (the Cook Islands and Niue ). Only one UN member state, Liechtenstein , has not ratified
1264-473: A specific mountain or groups of mountains. Around 225 species of butterflies have been discovered in the area, with six endemic species and 14 endemic subspecies. It constitutes approximately 57% of the entire Australian butterfly fauna. Rainfall in the area varies considerably, with elevation and orientation of the coastline being the major influences. Rainfall averages from 1,200 millimetres (mm) to over 8,000 mm annually. The highest mountains along
1343-635: A sticky disc near the top of the column. Just below the pollinia is a second, larger sticky plate called the stigma . The complex mechanisms that orchids have evolved to achieve cross-pollination were investigated by Charles Darwin and described in Fertilisation of Orchids (1862). Orchids have developed highly specialized pollination systems, thus the chances of being pollinated are often scarce, so orchid flowers usually remain receptive for very long periods, rendering unpollinated flowers long-lasting in cultivation. Most orchids deliver pollen in
1422-549: A unit within the Department of Environment and Heritage Protection . It is headed by a board of directors responsible to the Wet Tropics Ministerial Council which contains both Queensland and Federal Government representatives. The site contains many unique features such as over 390 rare plant species, which includes 74 species that are threatened. There are at least 85 species that are endemic to
1501-418: Is a pastel pink orchid with leaves spotted dark green and light green. The jewel orchid ( Ludisia discolor ) is grown more for its colorful leaves than its white flowers. Some orchids, such as Dendrophylax lindenii (ghost orchid), Aphyllorchis and Taeniophyllum depend on their green roots for photosynthesis and lack normally developed leaves, as do all of the heterotrophic species. Orchids of
1580-417: Is achieved by removing the pollinia with a small instrument such as a toothpick from the pollen parent and transferring them to the seed parent. Some orchids mainly or totally rely on self-pollination , especially in colder regions where pollinators are particularly rare. The caudicles may dry up if the flower has not been visited by any pollinator, and the pollinia then fall directly on the stigma. Otherwise,
1659-550: Is in constant flux, as new studies continue to clarify the relationships between species and groups of species, allowing more taxa at several ranks to be recognized. The Orchidaceae is currently placed in the order Asparagales by the APG III system of 2009. Five subfamilies are recognised. The cladogram below was made according to the APG system of 1998. It represents the view that most botanists had held up to that time. It
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#17327727586231738-585: Is maintained by the international World Heritage Program administered by the UNESCO World Heritage Committee , composed of 21 "states parties" that are elected by the United Nations General Assembly , and advised by reviews of international panels of experts in natural or cultural history, and education. The Program catalogues, names, and conserves sites of outstanding cultural or natural importance to
1817-592: Is often called a backbulb. Backbulbs still hold nutrition for the plant, but then a pseudobulb usually takes over, exploiting the last reserves accumulated in the backbulb, which eventually dies off, too. A pseudobulb typically lives for about five years. Orchids without noticeable pseudobulbs are also said to have growths, an individual component of a sympodial plant. Like most monocots , orchids generally have simple leaves with parallel veins , although some Vanilloideae have reticulate venation . Leaves may be ovate, lanceolate, or orbiculate, and very variable in size on
1896-404: Is often killed by motor vehicles. World Heritage Site World Heritage Sites are landmarks and areas with legal protection under an international treaty administered by UNESCO for having cultural, historical, or scientific significance. The sites are judged to contain "cultural and natural heritage around the world considered to be of outstanding value to humanity". To be selected,
1975-503: Is the only place in Australia where Aboriginal people have permanently inhabited a tropical rainforest environment. The Wet Tropics of Queensland stretches in part from Townsville to Cooktown , running in close parallel to the Great Barrier Reef (another World Heritage Site). The terrain is rugged. The Great Dividing Range and a number of small coastal ranges, highlands, tablelands, foothills and an escarpment dominate
2054-419: Is used as a food reserve for wintry periods, and provides for the development of the other one, from which visible growth develops. In warm and constantly humid climates, many terrestrial orchids do not need pseudobulbs. Epiphytic orchids, those that grow upon a support, have modified aerial roots that can sometimes be a few meters long. In the older parts of the roots, a modified spongy epidermis , called
2133-796: The United Nations Conference on the Human Environment in Stockholm. Under the World Heritage Committee, signatory countries are required to produce and submit periodic data reporting providing the committee with an overview of each participating nation's implementation of the World Heritage Convention and a "snapshot" of current conditions at World Heritage properties. Based on the draft convention that UNESCO had initiated,
2212-454: The vanilla plant ), the type genus Orchis , and many commonly cultivated plants such as Phalaenopsis and Cattleya . Moreover, since the introduction of tropical species into cultivation in the 19th century, horticulturists have produced many hybrids and cultivars . Orchids are easily distinguished from other plants, as they share some very evident derived characteristics or synapomorphies . Among these are: bilateral symmetry of
2291-707: The Great Barrier Reef on the endangered list, as global climate change had caused a further negative state of the corals and water quality. Again, the Australian government campaigned against this, and in July 2021, the World Heritage Committee , made up of diplomatic representatives of 21 countries, ignored UNESCO's assessment, based on studies of scientists, "that the reef was clearly in danger from climate change and so should be placed on
2370-1038: The List of World Heritage in Danger and the World Heritage List. Only three sites have ever been delisted : the Arabian Oryx Sanctuary in Oman, the Dresden Elbe Valley in Germany, and the Liverpool Maritime Mercantile City in the United Kingdom. The Arabian Oryx Sanctuary was directly delisted in 2007, instead of first being put on the danger list, after the Omani government decided to reduce
2449-642: The South Atlantic, is part of the Europe and North America region because the British government nominated the site. The table below includes a breakdown of the sites according to these regions and their classification as of July 2024 : This overview lists the 23 countries with 15 or more World Heritage Sites: Orchid Orchids are plants that belong to the family Orchidaceae ( / ˌ ɔːr k ɪ ˈ d eɪ s i . iː , - s i . aɪ / ),
Wet Tropics of Queensland - Misplaced Pages Continue
2528-618: The Wet Tropics are found nowhere else in the world. The Wet Tropics has the oldest continuously surviving tropical rainforests on earth. On 9 November 2012, the Australian Government also acknowledged the Indigenous heritage of the area as being nationally significant. The Aboriginal Rainforest People of the Wet Tropics of Queensland have lived continuously in the rainforest environment for at least 5000 years, and this
2607-567: The Wet Tropics were added to the Australian National Heritage List . The tropical forests have the highest concentration of primitive flowering plant families in the world. Only Madagascar and New Caledonia , due to their historical isolation, have humid, tropical regions with a comparable level of endemism . The Wet Tropics rainforests are recognised internationally for their ancient ancestry and many unique plants and animals. Many plant and animal species in
2686-523: The Wet Tropics. They continue living today as descendants of, and very similar to, the ancient Gondwanan fossil species considered one of the Eucalypts ' fossil ancestors, which diversified into so many different species forms of all the Eucalypt plants today. 65% of Australia's fern species are protected here, including all seven of the ancient fern species. 370 species of bird have been recorded in
2765-491: The World Heritage Area. 15% of the area is protected as national park . Among the national parks included within the Wet Tropics are: and over 700 protected areas including privately owned land. The Wet Tropics Management Authority was established in 1983; it is responsible for managing the site according to Australia's obligations under the World Heritage Convention. The agency employed 20 staff in 2012 as
2844-609: The World Heritage Committee for new designations. The Committee meets once a year to determine which nominated properties to add to the World Heritage List; sometimes it defers its decision or requests more information from the country that nominated the site. There are ten selection criteria – a site must meet at least one to be included on the list. Until 2004, there were six sets of criteria for cultural heritage and four for natural heritage. In 2005, UNESCO modified these and now has one set of ten criteria. Nominated sites must be of "outstanding universal value" and must meet at least one of
2923-998: The World Heritage Fund to facilitate its conservation under certain conditions. UNESCO reckons the restorations of the following four sites among its success stories: Angkor in Cambodia, the Old City of Dubrovnik in Croatia, the Wieliczka Salt Mine near Kraków in Poland, and the Ngorongoro Conservation Area in Tanzania. Additionally, the local population around a site may benefit from significantly increased tourism revenue. When there are significant interactions between people and
3002-428: The accumulation of growth hormones at that point. These shoots are known as keiki . Epipogium aphyllum exhibits a dual reproductive strategy, engaging in both sexual and asexual seed production. The likelihood of apomixis playing a substantial role in successful reproduction appears minimal. Within certain petite orchid species groups, there is a noteworthy preparation of female gametes for fertilization preceding
3081-499: The act of pollination. The ovary typically develops into a capsule that is dehiscent by three or six longitudinal slits, while remaining closed at both ends. The seeds are generally almost microscopic and very numerous, in some species over a million per capsule. After ripening, they blow off like dust particles or spores. Most orchid species lack endosperm in their seed and must enter symbiotic relationships with various mycorrhizal basidiomyceteous fungi that provide them
3160-554: The anther may rotate and then enter the stigma cavity of the flower (as in Holcoglossum amesianum ). The slipper orchid Paphiopedilum parishii reproduces by self-fertilization . This occurs when the anther changes from a solid to a liquid state and directly contacts the stigma surface without the aid of any pollinating agent or floral assembly. The labellum of the Cypripedioideae is poke bonnet-shaped , and has
3239-549: The area, 13 different types of rainforest and 29 species of mangrove , which is more than anywhere else in the country. Of the 19 families of primitive flowering plants worldwide, 12 are found in the Wet Tropics including two families found nowhere else. This includes at least 50 individual species which are endemic to the area. 90 species of orchids have been noted. The large rare trees Stockwellia or Vic Stockwell's Puzzle Stockwellia quadrifida ( Myrtaceae ) grow only in restricted areas of "well developed upland rain forest" in
Wet Tropics of Queensland - Misplaced Pages Continue
3318-504: The area. 11 species of those are found nowhere else. The southern cassowary and rare spotted-tailed quoll are some of the many threatened species, while the musky rat-kangaroo is one of 50 animal species that are unique to this area. The musky rat-kangaroo is significant because it represents an early stage in the evolution of kangaroos . Other rare animals include the yellow-bellied gliders and brush-tailed bettong . 107 mammal species have been identified. Australia's rarest mammal ,
3397-501: The awards, because World Heritage listing can significantly increase tourism returns. Site listing bids are often lengthy and costly, putting poorer countries at a disadvantage. Eritrea 's efforts to promote Asmara are one example. In 2016, the Australian government was reported to have successfully lobbied for the World Heritage Site Great Barrier Reef conservation efforts to be removed from
3476-504: The commitment of countries and local population to World Heritage conservation in various ways, providing emergency assistance for sites in danger, offering technical assistance and professional training, and supporting States Parties' public awareness-building activities. Being listed as a World Heritage Site can positively affect the site, its environment, and interactions between them. A listed site gains international recognition and legal protection, and can obtain funds from, among others,
3555-454: The committee. A site may be added to the List of World Heritage in Danger if conditions threaten the characteristics for which the landmark or area was inscribed on the World Heritage List. Such problems may involve armed conflict and war, natural disasters, pollution, poaching, or uncontrolled urbanisation or human development. This danger list is intended to increase international awareness of
3634-417: The common culture and heritage of humankind. The programme began with the Convention Concerning the Protection of the World Cultural and Natural Heritage , which was adopted by the General Conference of UNESCO on 16 November 1972. Since then, 196 states have ratified the convention, making it one of the most widely recognised international agreements and the world's most popular cultural programme. In 1954,
3713-412: The convention. By assigning places as World Heritage Sites, UNESCO wants to help preserve them for future generations. Its motivation is that "heritage is our legacy from the past, what we live with today" and that both cultural and natural heritage are "irreplaceable sources of life and inspiration". UNESCO's mission with respect to World Heritage consists of eight sub targets. These include encouraging
3792-650: The endangered monuments and sites. In 1960, the Director-General of UNESCO launched the International Campaign to Save the Monuments of Nubia . This resulted in the excavation and recording of hundreds of sites, the recovery of thousands of objects, as well as the salvage and relocation to higher ground of several important temples. The most famous of these are the temple complexes of Abu Simbel and Philae . The campaign ended in 1980 and
3871-401: The escarpment between Cairns and Tully receive the highest rainfall, mainly owing to orographic factors. Mount Bellenden Ker is the wettest recording station in the area with other high peaks and eastern slopes favouring high rainfall. Most of the rainfall occurs from November to April. Tropical cyclones may impact the area. The expansion of the sugarcane industry in lowland plains poses
3950-537: The flower ( zygomorphism ), many resupinate flowers, a nearly always highly modified petal (labellum), fused stamens and carpels , and extremely small seeds . All orchids are perennial herbs that lack any permanent woody structure. They can grow according to two patterns: Terrestrial orchids may be rhizomatous or form corms or tubers . The root caps of terrestrial orchids are smooth and white. Some sympodial terrestrial orchids, such as Orchis and Ophrys , have two subterranean tuberous roots . One
4029-536: The flower develops, it undergoes a twisting through 180°, called resupination , so that the labellum lies below the column . The labellum functions to attract insects, and in resupinate flowers, also acts as a landing stage, or sometimes a trap. The reproductive parts of an orchid flower are unique in that the stamens and style are joined to form a single structure, the column . Instead of being released singly, thousands of pollen grains are contained in one or two bundles called pollinia that are attached to
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#17327727586234108-436: The flower, it pulls the pollinium out of the anther, as it is connected to the viscidium by the caudicle or stipe. The caudicle then bends and the pollinium is moved forwards and downwards. When the pollinator enters another flower of the same species, the pollinium has taken such position that it will stick to the stigma of the second flower, just below the rostellum, pollinating it. In horticulture, artificial orchid pollination
4187-409: The flowers to gather volatile chemicals they require to synthesize pheromonal attractants. Males of such species as Euglossa imperialis or Eulaema meriana have been observed to leave their territories periodically to forage for aromatic compounds, such as cineole, to synthesize pheromone for attracting and mating with females. Each type of orchid places the pollinia on a different body part of
4266-515: The function of trapping visiting insects. The only exit leads to the anthers that deposit pollen on the visitor. In some extremely specialized orchids, such as the Eurasian genus Ophrys , the labellum is adapted to have a colour, shape, and odour which attracts male insects via mimicry of a receptive female. Pollination happens as the insect attempts to mate with flowers. Many neotropical orchids are pollinated by male orchid bees , which visit
4345-430: The genus Corallorhiza (coralroot orchids) lack leaves altogether and instead have symbiotic or parasitic associations with fungal mycelium, though which they absorb sugars. Orchid flowers have three sepals , three petals and a three-chambered ovary . The three sepals and two of the petals are often similar to each other but one petal is usually highly modified, forming a "lip" or labellum . In most orchid genera, as
4424-538: The government of Egypt decided to build the new Aswan High Dam , whose resulting future reservoir would eventually inundate a large stretch of the Nile valley containing cultural treasures of ancient Egypt and ancient Nubia . In 1959, the governments of Egypt and Sudan requested the United Nations Educational, Scientific and Cultural Organization (UNESCO) to assist them to protect and rescue
4503-461: The individual plant. Their characteristics are often diagnostic. They are normally alternate on the stem, often folded lengthwise along the centre ("plicate"), and have no stipules . Orchid leaves often have siliceous bodies called stegmata in the vascular bundle sheaths (not present in the Orchidoideae ) and are fibrous. The structure of the leaves corresponds to the specific habitat of
4582-483: The insectivorous Flores tube-nosed bat ( Murina florium ), is also found here. One quarter of Australia's rodent species are found within the Wet Tropics. 113 species of reptiles including 24 endemic species are found in the area and there are 51 amphibian species, of which 22 are endemic. One reason for the very high level of endemism is that the geomorphology is diverse, resulting in habitat islands where distinct subspecies have evolved. Some species are endemic to
4661-762: The landscape. The heritage site contains the northern section of the Queensland tropical rain forests including the Daintree Rainforest . 16 different structural types of rainforest have been identified. The World Heritage area includes Australia's highest waterfall, Wallaman Falls . In total it spans 13 major river systems including the Annan , Bloomfield , Daintree , Barron , Mulgrave , Russell , Johnstone , Tully , Herbert , Burdekin , Mitchell , Normanby and Palmer River . Copperlode Falls Dam , Koombooloomba Dam and Paluma Dam are found within
4740-401: The largest orchid in the world, Grammatophyllum speciosum (giant orchid), it can reach three meters. Some Dendrobium species have long, canelike pseudobulbs with short, rounded leaves over the whole length; some other orchids have hidden or extremely small pseudobulbs, completely included inside the leaves. With ageing the pseudobulb sheds its leaves and becomes dormant. At this stage it
4819-992: The last two decades. These activities endanger Natural World Heritage Sites and could compromise their unique values. Of the Natural World Heritage Sites that contain forest, 91% experienced some loss since 2000. Many of them are more threatened than previously thought and require immediate conservation action. The destruction of cultural assets and identity-establishing sites is one of the primary goals of modern asymmetrical warfare. Terrorists, rebels, and mercenary armies deliberately smash archaeological sites, sacred and secular monuments and loot libraries, archives and museums. The UN, United Nations peacekeeping and UNESCO in cooperation with Blue Shield International are active in preventing such acts. "No strike lists" are also created to protect cultural assets from air strikes. The founding president of Blue Shield International Karl von Habsburg summed it up with
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#17327727586234898-517: The list." According to environmental protection groups, this "decision was a victory for cynical lobbying and [...] Australia, as custodians of the world's biggest coral reef, was now on probation." Several listed locations, such as Casco Viejo in Panama and Hội An in Vietnam , have struggled to strike a balance between the economic benefits of catering to greatly increased visitor numbers after
4977-836: The local level which can result in the site being damaged. Rock art under world heritage protection at the Tadrart Acacus in Libya have occasionally been intentionally destroyed. Chalcraft links this destruction to Libyan national authorities prioritizing World Heritage status over local sensibilities by limiting access to the sites without consulting with the local population. UNESCO has also been criticized for alleged geographic bias, racism , and colourism in world heritage inscription. A major chunk of all world heritage inscriptions are located in regions whose populations generally have lighter skin, including Europe, East Asia, and North America. The World Heritage Committee has divided
5056-730: The natural environment, these can be recognised as "cultural landscapes". A country must first identify its significant cultural and natural sites in a document known as the Tentative List. Next, it can place sites selected from that list into a Nomination File, which is evaluated by the International Council on Monuments and Sites and the World Conservation Union . A country may not nominate sites that have not been first included on its Tentative List. The two international bodies make recommendations to
5135-418: The necessary nutrients to germinate, so almost all orchid species are mycoheterotrophic during germination and reliant upon fungi to complete their lifecycles. Only a handful of orchid species have seed that can germinate without mycorrhiza , namely the species within the genus Disa with hydrochorous seeds. As the chance for a seed to meet a suitable fungus is very small, only a minute fraction of all
5214-663: The plant. Species that typically bask in sunlight, or grow on sites which can be occasionally very dry, have thick, leathery leaves and the laminae are covered by a waxy cuticle to retain their necessary water supply. Shade-loving species, on the other hand, have long, thin leaves. The leaves of most orchids are perennial, that is, they live for several years, while others, especially those with plicate leaves as in Catasetum , shed them annually and develop new leaves together with new pseudobulbs. The leaves of some orchids are considered ornamental. The leaves of Macodes sanderiana ,
5293-562: The protected area's size by 90%. The Dresden Elbe Valley was first placed on the danger list in 2006 when the World Heritage Committee decided that plans to construct the Waldschlösschen Bridge would significantly alter the valley's landscape. In response, the Dresden City Council attempted to stop the bridge's construction. However, after several court decisions allowed the building of the bridge to proceed,
5372-467: The recognition and preserving the original culture and local communities. Another criticism is that there is a homogeneity to these sites, which contain similar styles, visitor centres , etc., meaning that a lot of the individuality of these sites has been removed to become more attractive to tourists. Anthropologist Jasper Chalcraft said that World Heritage recognition often ignores contemporary local usage of certain sites. This leads to conflicts on
5451-417: The seeds released grow into adult plants. In cultivation, germination typically takes weeks. Horticultural techniques have been devised for germinating orchid seeds on an artificial nutrient medium, eliminating the requirement of the fungus for germination and greatly aiding the propagation of ornamental orchids. The usual medium for the sowing of orchids in artificial conditions is agar gel combined with
5530-419: The stem of sympodial epiphytes, or in some species essentially the entire stem, may be thickened to form a pseudobulb that contains nutrients and water for drier periods. The pseudobulb typically has a smooth surface with lengthwise grooves, and can have different shapes, often conical or oblong. Its size is very variable; in some small species of Bulbophyllum , it is no longer than two millimeters, while in
5609-481: The ten criteria. A country may request to extend or reduce the boundaries, modify the official name, or change the selection criteria of one of its already listed sites. Any proposal for a significant boundary change or to modify the site's selection criteria must be submitted as if it were a new nomination, including first placing it on the Tentative List and then onto the Nomination File. A request for
5688-405: The threats and to encourage counteractive measures. Threats to a site can be either proven imminent threats or potential dangers that could have adverse effects on a site. The state of conservation for each site on the danger list is reviewed yearly; after this, the Committee may request additional measures, delete the property from the list if the threats have ceased or consider deletion from both
5767-622: The valley was removed from the World Heritage List in 2009. Liverpool 's World Heritage status was revoked in July 2021, following developments ( Liverpool Waters and Bramley-Moore Dock Stadium ) on the northern docks of the World Heritage site leading to the "irreversible loss of attributes" on the site. The first global assessment to quantitatively measure threats to Natural World Heritage Sites found that 63% of sites have been damaged by increasing human pressures including encroaching roads, agriculture infrastructure and settlements over
5846-436: The words: "Without the local community and without the local participants, that would be completely impossible". The UNESCO-administered project has attracted criticism. This was caused by perceived under-representation of heritage sites outside Europe, disputed decisions on site selection and adverse impact of mass tourism on sites unable to manage rapid growth in visitor numbers. A large lobbying industry has grown around
5925-526: The work of the World Heritage Committee was developed over a seven-year period (1965–1972). The United States initiated the idea of safeguarding places of high cultural or natural importance. A White House conference in 1965 called for a "World Heritage Trust" to preserve "the world's superb natural and scenic areas and historic sites for the present and the future of the entire world citizenry". The International Union for Conservation of Nature developed similar proposals in 1968, which were presented in 1972 at
6004-744: The world into five geographic regions: Africa, Arab states, Asia and the Pacific, Europe and North America, and Latin America and the Caribbean. Russia and the Caucasus states are classified as European, while Mexico and the Caribbean are classified as belonging to the Latin America and the Caribbean region. The UNESCO geographic regions also give greater emphasis on administrative, rather than geographic associations. Hence, Gough Island , located in
6083-693: Was collected from 50 countries. The project's success led to other safeguarding campaigns, such as saving Venice and its lagoon in Italy, the ruins of Mohenjo-daro in Pakistan, and the Borobodur Temple Compounds in Indonesia. Together with the International Council on Monuments and Sites , UNESCO then initiated a draft convention to protect cultural heritage. The convention (the signed document of international agreement ) guiding
6162-973: Was considered a success. To thank countries which especially contributed to the campaign's success, Egypt donated four temples; the Temple of Dendur was moved to the Metropolitan Museum of Art in New York City , the Temple of Debod to the Parque del Oeste in Madrid , the Temple of Taffeh to the Rijksmuseum van Oudheden in Leiden , and the Temple of Ellesyia to Museo Egizio in Turin . The project cost US$ 80 million (equivalent to $ 295.83 million in 2023), about $ 40 million of which
6241-594: Was supported by morphological studies , but never received strong support in molecular phylogenetic studies. Apostasioideae : 2 genera and 16 species, south-eastern Asia Cypripedioideae : 5 genera and 130 species, from the temperate regions of the world, as well as tropical America and tropical Asia Vanilloideae : 15 genera and 180 species, humid tropical and subtropical regions, eastern North America Epidendroideae : more than 500 genera and more or less 20,000 species, cosmopolitan Orchidoideae : 208 genera and 3,630 species, cosmopolitan In 2015,
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