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F. M. Niven
Frances Gamble (1949–1997) was a South African Climatology, climatologist and Speleology, speleologist. Her work on cave conservation was extensive and pioneering. She evaluated cave ecosystems and conservation policies which were necessary to protect them. Gamble was one of the founders of the Cave Research Organisation of South Africa, which aimed at improving the scientific and professional development of speleology in South Africa. She was president of the Environmental Education Association of South Africa from 1986 to 1989 and of the South African Geographical Society from 1989 to 1991. At a time when Apartheid limited collaboration for South African researchers, she built networks internationally to facilitate research. Early life and education Frances Niven was born in 1949 in Pietermaritzburg, Natal (province), Natal Province, South Africa to Cynthia Mary (née Hosking) and John McGregor "Jack" Niven. Both of her parents were academics. Prior to his marriage, her father ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Brackets
A bracket is either of two tall fore- or back-facing punctuation marks commonly used to isolate a segment of text or data from its surroundings. Typically deployed in symmetric pairs, an individual bracket may be identified as a 'left' or 'right' bracket or, alternatively, an "opening bracket" or "closing bracket", respectively, depending on the Writing system#Directionality, directionality of the context. Specific forms of the mark include parentheses (also called "rounded brackets"), square brackets, curly brackets (also called 'braces'), and angle brackets (also called 'chevrons'), as well as various less common pairs of symbols. As well as signifying the overall class of punctuation, the word "bracket" is commonly used to refer to a specific form of bracket, which varies from region to region. In most English-speaking countries, an unqualified word "bracket" refers to the parenthesis (round bracket); in the United States, the square bracket. Glossary of mathematical sym ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bachelor Of Science
A Bachelor of Science (BS, BSc, SB, or ScB; from the Latin ') is a bachelor's degree awarded for programs that generally last three to five years. The first university to admit a student to the degree of Bachelor of Science was the University of London in 1860. In the United States, the Lawrence Scientific School first conferred the degree in 1851, followed by the University of Michigan in 1855. Nathaniel Southgate Shaler, who was Harvard's Dean of Sciences, wrote in a private letter that "the degree of Bachelor of Science came to be introduced into our system through the influence of Louis Agassiz, who had much to do in shaping the plans of this School." Whether Bachelor of Science or Bachelor of Arts degrees are awarded in particular subjects varies between universities. For example, an economics student may graduate as a Bachelor of Arts in one university but as a Bachelor of Science in another, and occasionally, both options are offered. Some universities follow the Oxford a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
National Speleological Society
The National Speleological Society (NSS) is an organization formed in 1941 to advance the exploration, conservation, study, and understanding of caves in the United States. Originally headquartered in Washington D.C., its current offices are in Huntsville, Alabama. The organization engages in the research and scientific study, restoration, exploration, and protection of caves. It has more than 10,000 members in more than 250 grottos. History The Speleological Society of the District of Columbia (SSDC) was formed on May 6, 1939 by Bill Stephenson. In the fall of 1940, the officers of the SSDC drafted a proposed constitution that would transform the SSDC into the National Speleological Society. On January 24, 1941, Stephenson sent a letter to all members of the SSDC announcing that "on January 1 the Society was reorganized as a national organization." The New England Grotto was the first NSS Grotto. It was chartered in 1941 with Clay Perry as president and Ned Anderson as vice pr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
British Cave Research Association
The British Cave Research Association (BCRA) is a speleological organisation in the United Kingdom. Its object is to promote the study of caves and associated phenomena, and it attains this by supporting cave and karst research, encouraging original exploration (both in the UK and on expeditions overseas), collecting and publishing speleological information, maintaining a library and organising educational and scientific conferences and meetings. BCRA is a registered charity in the UK, and a constituent body of the British Caving Association (BCA), undertaking charitable activities on behalf of BCA. History The British Cave Research Association arose from a merger in 1973 of the British Speleological Association (BSA) and the Cave Research Group of Great Britain (CRG). When the National Caving Association (NCA) was formed in 1968, BCRA became one of its constituent bodies. Although NCA was recognised as the governing body for UK caving by the Sports Council it did not allow in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Speleothem
A speleothem (; ) is a geological formation by mineral deposits that accumulate over time in natural caves. Speleothems most commonly form in calcareous caves due to carbonate dissolution reactions. They can take a variety of forms, depending on their depositional history and environment. Their chemical composition, gradual growth, and preservation in caves make them useful paleoclimatic proxies. Chemical and physical characteristics More than 300 variations of cave mineral deposits have been identified. The vast majority of speleothems are calcareous, composed of calcium carbonate (CaCO3) minerals (calcite or aragonite). Less commonly, speleothems are made of calcium sulfate (gypsum or mirabilite) or opal. Speleothems of pure calcium carbonate or calcium sulfate are translucent and colorless. The presence of iron oxide or copper provides a reddish brown color. The presence of manganese oxide can create darker colors such as black or dark brown. Speleothems can also be brown d ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Guano
Guano (Spanish from qu, wanu) is the accumulated excrement of seabirds or bats. As a manure, guano is a highly effective fertilizer due to the high content of nitrogen, phosphate, and potassium, all key nutrients essential for plant growth. Guano was also, to a lesser extent, sought for the production of gunpowder and other explosive materials. The 19th-century seabird guano trade played a pivotal role in the development of modern input-intensive farming. The demand for guano spurred the human colonization of remote bird islands in many parts of the world. Unsustainable seabird guano mining processes can result in permanent habitat destruction and the loss of millions of seabirds. Bat guano is found in caves throughout the world. Many cave ecosystems are wholly dependent on bats to provide nutrients via their guano which supports bacteria, fungi, invertebrates, and vertebrates. The loss of bats from a cave can result in the extinction of species that rely on their guano. U ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Introduced Species
An introduced species, alien species, exotic species, adventive species, immigrant species, foreign species, non-indigenous species, or non-native species is a species living outside its native distributional range, but which has arrived there by human activity, directly or indirectly, and either deliberately or accidentally. Non-native species can have various effects on the local ecosystem. Introduced species that become established and spread beyond the place of introduction are considered naturalized. The process of human-caused introduction is distinguished from biological colonization, in which species spread to new areas through "natural" (non-human) means such as storms and rafting. The Latin expression neobiota captures the characteristic that these species are ''new'' biota to their environment in terms of established biological network (e.g. food web) relationships. Neobiota can further be divided into neozoa (also: neozoons, sing. neozoon, i.e. animals) and neophyt ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Biotic Interchange
Biotic interchange is the process by which species from one Biota (taxonomy), biota invade another biota, usually due to the disappearance of a previously impassable barrier. These dispersal barriers can be physical, climatic, or biological and can include bodies of water or ice, land features like mountains, Climate classification, climate zones, or competition between species. Biotic interchange has been documented to occur in marine, freshwater, and terrestrial environments. Causes The general cause of a biotic interchange is the disappearance of a barrier that had been previously blocking the dispersal of species from two distinct biotas. The disappearance of a barrier could be from the closing of a sea, connecting two previously unconnected continents; the melting of glaciers, allowing for migration across newly exposed areas that had been covered by ice; from Sea level rise, sea level change, covering a land bridge would allow for marine interchange, while revealing a land ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lampenflora
Lampenflora, also known in English as lamp-flora or lamp flora are autotrophic lifeforms present in natural or artificial caves associated with permanently installed lighting. Lampenflora are a problem with respect to the conservation of cave features, artworks, and fauna, and consequently their presence in caves can be referred to by the terms ''green sickness'' and ''la maladie verte''. Etymology The term "lampenflora" has come to English from German. It was coined by botanist Klaus Dobat in the 1960s, and just means "lamp flora". Taxa found in lampenflora So far the following types of lampenflora have been described: * cyanobacteria * algae – ''Chlorophyceae'', golden algae '' (Chrysophyceae)'', diatoms '' (Bacillariophyceae)''Karl JohnsonCONTROL OF LAMPENFLORA AT WAITOMO CAVES. NEW ZEALAND 1977 * non-vascular plants – Marchantiophyta '' (Marchantiophyta)'', moss '' (Bryophyta)'' * ferns – Species of the genera '' Asplenium'' (spleenworts), ''Cystopteris'' (blad ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hydrology
Hydrology () is the scientific study of the movement, distribution, and management of water on Earth and other planets, including the water cycle, water resources, and environmental watershed sustainability. A practitioner of hydrology is called a hydrologist. Hydrologists are scientists studying earth or environmental science, civil or environmental engineering, and physical geography. Using various analytical methods and scientific techniques, they collect and analyze data to help solve water related problems such as environmental preservation, natural disasters, and water management. Hydrology subdivides into surface water hydrology, groundwater hydrology (hydrogeology), and marine hydrology. Domains of hydrology include hydrometeorology, surface hydrology, hydrogeology, drainage-basin management, and water quality, where water plays the central role. Oceanography and meteorology are not included because water is only one of many important aspects within those fields. H ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pollution
Pollution is the introduction of contaminants into the natural environment that cause adverse change. Pollution can take the form of any substance (solid, liquid, or gas) or energy (such as radioactivity, heat, sound, or light). Pollutants, the components of pollution, can be either foreign substances/energies or naturally occurring contaminants. Although environmental pollution can be caused by natural events, the word pollution generally implies that the contaminants have an anthropogenic source – that is, a source created by human activities. Pollution is often classed as point source or nonpoint source pollution. In 2015, pollution killed nine million people worldwide (one in six deaths). This remained unchanged in 2019, with little real progress against pollution being identifiable. Air pollution accounted for of these earlier deaths. Major forms of pollution include air pollution, light pollution, litter, noise pollution, plastic pollution, soil contamination, radioactiv ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Margaret E
Margaret is a female first name, derived via French () and Latin () from grc, μαργαρίτης () meaning "pearl". The Greek is borrowed from Indo-Iranian languages, Persian. Margaret has been an English name since the 11th century, and remained popular throughout the Middle Ages. It became less popular between the 16th century and 18th century, but became more common again after this period, becoming the second-most popular female name in the United States in 1903. Since this time, it has become less common, but was still the ninth-most common name for women of all ages in the United States as of the List of most popular given names, 1990 census. Margaret has many diminutive forms in many different languages, including Maggie, Madge (given name), Madge, Daisy (given name), Daisy, Margarete, Marge, Margo (given name), Margo, Margie, Marjorie, Meg, Megan, Rita (given name), Rita, Greta (given name), Greta, Gretchen, and Peggy (given name), Peggy. Name variants Full name ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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