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Koa Wilt
Koa wilt is a relatively new disease to Hawaii, discovered in 1980. Koa wilt is caused by a forma specialis of the fungus ''Fusarium oxysporum'', which is now abundant in Hawaiian soils and infects the native Acacia koa tree, a once-dominant species in the canopy of Hawaiian forests. ''Fusarium oxysporum'' f.sp. ''koae'' is believed to have been brought into Hawaii on an ornamental acacia plant. Fusarium fungi clog the tree xylem, causing significant wilt and mortality among Koa trees. Due to their cultural importance, Koa wilt is one of the Environmental issues in Hawaii, environmental issues of Hawaii. Hosts and symptoms The host for Koa wilt is Acacia koa, a tree that is native and endemic to the Hawaiian islands. It ranges in size from 15 to greater than 50 feet with a canopy spread of 20 to 40 feet. It has a showy white flower and blooms sporadically. Mature leaves are sickle shaped. Koa wilt is typically a fatal pathogen for its host. In only a few months, a tree may lo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Diederich Franz Leonhard Von Schlechtendal
Diederich Franz Leonhard von Schlechtendal (27 November 1794, Xanten – 12 October 1866, Halle an der Saale, Halle) was a German botanist. Life and work Von Schlechtendal was born in Xanten, Xanten am Rhein and when his father Diederich Friedrich Carl von Schlechtendal (1767-1842) became a court judge. His mother Katharina Margarete Schlechtendal, née Bartels died when he was just three. His father lost his job when the French occupied the left bank of the Rhine and the family moved to Berlin. Contact with Carl Ludwig Willdenow, Carl Willdenow made him interested in botany at an early age. He went to the gymnasium in Berlin and then in a monastery school before joining voluntary military service in Breslau. He was dismissed for being physically unfit and he returned to Berlin to study botany. In 1813 he attended lectures in botany and medicine under Christoph Wilhelm Hufeland (1762-1836), Carl August Wilhelm Berends, Karl August Berends (1795-1826), and Karl Ferdinand von Gr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Endemic
Endemism is the state of a species being found only in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also found elsewhere. For example, the Cape sugarbird is found exclusively in southwestern South Africa and is therefore said to be ''endemic'' to that particular part of the world. An endemic species can also be referred to as an ''endemism'' or, in scientific literature, as an ''endemite''. Similarly, many species found in the Western ghats of India are examples of endemism. Endemism is an important concept in conservation biology for measuring biodiversity in a particular place and evaluating the risk of extinction for species. Endemism is also of interest in evolutionary biology, because it provides clues about how changes in the environment cause species to undergo range shifts (potentially expanding their range into a larger area or bec ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fungal Plant Pathogens And Diseases
A fungus (: fungi , , , or ; or funguses) is any member of the group of eukaryotic organisms that includes microorganisms such as yeasts and molds, as well as the more familiar mushrooms. These organisms are classified as one of the traditional eukaryotic kingdoms, along with Animalia, Plantae, and either Protista or Protozoa and Chromista. A characteristic that places fungi in a different kingdom from plants, bacteria, and some protists is chitin in their cell walls. Fungi, like animals, are heterotrophs; they acquire their food by absorbing dissolved molecules, typically by secreting digestive enzymes into their environment. Fungi do not photosynthesize. Growth is their means of mobility, except for spores (a few of which are flagellated), which may travel through the air or water. Fungi are the principal decomposers in ecological systems. These and other differences place fungi in a single group of related organisms, named the ''Eumycota'' (''true fungi'' or ' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rhodacanthis Flaviceps
The lesser koa finch (''Rhodacanthis flaviceps'') is an extinct species of Hawaiian honeycreeper in the subfamily Carduelinae of the family Fringillidae. It was endemic to the island of Hawaiʻi. Description The only specimens of the lesser koa finch ever caught were a family group with members of different ages and sex, ideal for study.George C. Munro. (1944) The males were apparently golden-yellow with olive green on the breast and belly. The females were almost indistinguishable from the species' larger relative, the greater koa finch (''Rhodacanthis palmeri''), other than the fact that the former were slightly darker in color. The juveniles were somewhat mottled on the belly, similar to the females. Distribution and habitat The lesser koa finch was endemic to the island of Hawaiʻi. This species was recorded in upland koa ('' Acacia koa'') forests, but likely inhabited lowland habitat until before or shortly after the time of western contact in 1778. The IUCN Red ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rhodacanthis Palmeri
The greater koa finch (''Rhodacanthis palmeri'') is an extinct species of Hawaiian honeycreeper in the subfamily Carduelinae of the family Fringillidae. It was endemic to the island of Hawaiʻi. Description The bird was about 7–8 in (18–20 cm) long when fully grown. It was the largest known honey-creeper, although its typical weight is unknown. The bird was sexually dimorphic; the male was brilliant scarlet-orange on head, neck, and breast, with lighter orange on its bottom, and olive brown with orange touches on back, wings, and tail; however, the female was brownish olive, and somewhat lighter below. It had a thick black bill which allowed it to break open seed pods that were found in the trees. In historical times, its range was largely confined to the Kona District of the island of Hawaii, although it was observed in the Kīlauea area in 1895. It was much more widespread prior to the arrival of humans in Hawaii, and related species lived on other islands. In K ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Board Foot
The board foot or board-foot is a unit of measurement for the volume of lumber in the United States and Canada. It equals the volume of a board that is in length, one foot in width, and in thickness, or exactly liters. Board foot can be abbreviated as FBM (for "foot, board measure"), BDFT, or BF. A thousand board feet can be abbreviated as MFBM, MBFT, or MBF. Similarly, a million board feet can be abbreviated as MMFBM, MMBFT, or MMBF. Until the 1970s, in Australia and New Zealand, the terms super foot and superficial foot were used with the same meaning. Description One board foot equals: * 1 ft × 1 ft × 1 in * 12 in × 12 in × 1 in * 12 ft × 1 in × 1 in * 144 cu in * cu ft * ≈ * ≈ * ≈ or steres * Petrograd Standard of board Usage The board foot is used to measure both rough (unprocessed) lumber and planed (surfaced) lumber. Rough lumber is measured before drying and planing, using its full sawn dimensions. Planed lumber, such as standard so ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mesic Habitat
In ecology, a mesic habitat is a type of habitat with a well-balanced or moderate supply of moisture throughout the growing season (e.g., a mesic forest, temperate hardwood forest, or dry-mesic prairie). The term derives from the Greek ''mesos'', meaning middle, indicating its relative moisture content between hydric (moist) and xeric (dry) habitats. The word "mesic" can apply to the plants or soils within the mesic habitat (i.e. mesic plants, mesic soils). Mesic habitats provide a moderate moisture content that remains relatively constant during crucial growing periods. A variety of outside factors contribute to the presence of water in the system, including streams and their offshoots, wet meadows, springs, seeps, irrigated fields, and high-elevation habitats. These factors effectively provide drought insurance during the growing season against climatic factors such as increasing temperatures, lack of rain, and the effects of urbanization. Other habitat types, such as m ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cambium
A cambium (: cambiums or cambia), in plants, is a tissue layer that provides partially undifferentiated cells for plant growth. It is found in the area between xylem and phloem. A cambium can also be defined as a cellular plant tissue from which phloem, xylem, or cork grows by division, resulting (in woody plants) in secondary thickening. It forms parallel rows of cells, which result in secondary tissues. There are several distinct kinds of cambium found in plant stems and roots: * Cork cambium, a tissue found in many vascular plants as part of the periderm. * Unifacial cambium, which ultimately produces cells to the interior of its cylinder. * Vascular cambium, a lateral meristem in the vascular tissue of plants. Uses The cambium of many species of woody plants are edible; however, due to its vital role in the homeostasis and growth of woody plants, this may result in death of the plant if enough cambium is removed at once. The cambium can generally be eaten raw or co ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acacia Koa Trees
''Acacia'', commonly known as wattles or acacias, is a genus of about of shrubs and trees in the subfamily Mimosoideae of the pea family Fabaceae. Initially, it comprised a group of plant species native to Africa, South America, and Australasia, but is now reserved for species mainly from Australia, with others from New Guinea, Southeast Asia, and the Indian Ocean. The genus name is Neo-Latin, borrowed from Koine Greek (), a term used in antiquity to describe a preparation extracted from ''Vachellia nilotica'', the original type species. Several species of ''Acacia'' have been introduced to various parts of the world, and two million hectares of commercial plantations have been established. Description Plants in the genus ''Acacia'' are shrubs or trees with bipinnate leaves, the mature leaves sometimes reduced to phyllodes or rarely absent. There are 2 small stipules at the base of the leaf, but sometimes fall off as the leaf matures. The flowers are borne in spike ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Emendation (taxonomy)
In zoological nomenclature, emendations are intentional alterations made to the spelling of taxon names. In bacteriological nomenclature, emendations are made to the circumscription of a taxon. All emendations are considered by default to be available names. An emendation may be "justified" (when the original spelling is demonstrably incorrect under the International Code of Zoological Nomenclature,International Commission on Zoological Nomenclature. 1999International Code of Zoological Nomenclature. 4th ed.London: The International Trust for Zoological Nomenclature. Article 32.5), or it may be "unjustified" (if the change violates the rules of the Code). A justified emendation is different from a " mandatory change" only in that the latter is required by the Code, under Article 34. An unjustified emendation is different from an " incorrect subsequent spelling" in that the latter is an unintentional change, while an emendation is explicitly intentional, and in that an incorrect ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Environmental Issues In Hawaii
The majority of environmental issues affecting Hawaii today are related to pressures from increasing human and animal population, as well as urban expansion both directly on the islands and from overseas. These issues include the Environmental impact of tourism, unsustainable impacts of tourism, urbanization, climate change implications such as sea level rise, pollution (especially marine plastic pollution), and invasive species. Water quality The waters surrounding the Hawaiian Islands are affected by increasing waste products like marine debris from land and ocean sources washing onto shore as well as effluents generated and released from the islands themselves. Oceans in particular are being devastated by factors including marine debris, plastic pollution, and environmental impact of tourism, tourism. Marine debris The positioning of Hawaii in particular makes it a high-impact target for marine debris, given the natural ocean currents and its relative location to the North ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
