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Aythya Baeri
Baer's pochard (''Aythya baeri'') is a diving duck found in eastern Asia. It is a resident bird in North and Central China, formerly bred in southeast Russia and Northeast China, migrating in winter to southern China, Vietnam, Japan, and India. Baer's pochard is a monotypic species. The holotype was collected in middle Amur. It has a distinctive black head and neck with green gloss not present elsewhere in ''Aythya''. But in poor light, it is likely to look completely black. It is very similar and closely related to the ferruginous duck, and they were previously considered to be a single species; Baer's pochard is differentiated by its white flanks when floating on the water, as well as its larger size and longer, more rounded head. Its breeding season varies by latitude and environment. The nest, built from sedges, reeds and other plants, is placed among emergent vegetation, usually in shallow water or on small islands or ridges. Its clutch size ranges from 5 to 14. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gustav Radde
Gustav Ferdinand Richard Radde (27 November 1831 – 2 March 1903) was a German natural history, naturalist and Siberian List of explorers, explorer. Radde's warbler and several other species are named after him. Biography Radde was born in Danzig, the son of a schoolmaster. He had little formal education, and began a career as an apothecary. At an early age he was influenced by Anton Menge and became increasingly interested in natural history, and in 1852 he gave up his career and spent two years in the Crimea with the botanist Christian von Steven, collecting both plants and animals. He made further trips to southern Russia with Johann Friedrich von Brandt and Karl Ernst von Baer. He was botanist and zoologist on the East Siberian Expedition of 1855, led by the astronomer Ludwig Schwarz (astronomer), Ludwig Schwarz. In 1864 he eventually settled in Tbilisi. In the same year he explored the region surrounding Mount Elbrus, the highest mountain in the Western Palearctic. As well a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Endangered And Protected Species Of China
The endangered species of China may include any wildlife species designated for protection by the national government of China or listed as endangered by international organizations such as the Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES) and the International Union for Conservation of Nature (IUCN). As one of the world's most biodiverse countries and its most populous, China is home to a significant number of wildlife species vulnerable to or in danger of local extinction due to the impact of human activity. Under the Law of the People's Republic of China on the Protection of Wildlife, the national and local governments are required to designate rare or threatened species for special protection under the law. The type of legal protection that a particular species in China enjoys may depend on the locality of administration. For example, the Beijing Municipal Government designates the red fox, wild boar, leopard cat and masked pa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bradley Curtis Livezey
Bradley Curtis Livezey (June 15, 1954 – February 8, 2011) was an American ornithologist with scores of publications. His main research included the evolution of flightless birds, the systematics of birds, and the ecology and behaviour of steamer ducks. Early life Livezey was born in Salem, Massachusetts. He grew up in Massachusetts, Pennsylvania, and Illinois. His interest in birds started when he was in High School. Livezey earned a Bachelor of Science at Oregon State University in 1976. In 1979 he earned his first Master of Science degree at the University of Wisconsin–Madison in wildlife ecology and in 1984 his second in mathematics at the University of Kansas. In 1985 he completed a Ph.D. with his thesis ''Systematics and flightlessness of steamer-ducks (Anatidae: Tachyeres)'' at the University of Kansas. In 1993, he was hired as Associate Curator of Birds at Carnegie Museum of Natural History in Pittsburgh and was awarded full curatorship in 2001. During that time, he se ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hardhead
The hardhead (''Aythya australis''), also known as the white-eyed duck, is the only true diving duck found in Australia. The common name "hardhead" has nothing to do with the density of the bird's skull, instead referring to the difficulty encountered by early taxidermists in processing the head. Hardheads are found in wetter, coastal regions of Australia, particularly in the south-east, but are known to disperse as far afield as New Guinea, New Zealand, and the Pacific Islands. Description Hardheads are smaller than most ducks, usually not reaching much more than 45 cm long but sometimes reaching 60 cm, and noticeably more rounded in overall form than most ducks. Both male and female are a fairly uniform chocolate-brown above, with rufous flanks and white undersides (which are often not visible if the duck is in the water). The trailing edges and almost the entire underside of the wings are white. In the male, the eyes are a striking white, in the female, brown. Di ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paul Johnsgard
Paul Austin Johnsgard (28 June 1931 – 28 May 2021) was an ornithologist, artist and emeritus professor at the University of Nebraska. His works include nearly fifty books including several monographs, principally about the waterfowl and cranes. Childhood and education Born in Fargo, North Dakota, he was introduced to the study of birds by a distant cousin who was a game warden. He spent these early years taking part in duck counts. After high school and junior college at Wahpeton, he enrolled at North Dakota State University to major in zoology. He then moved to Washington State University for his master's degree, encouraged by a professor who suggested that he could have a career in ornithology. His master's study was on the impact of the construction of O'Sullivan Dam to wetland habitats. Apart from the data collected and his interpretation, it included his pen sketches. This was published in '' The Condor'' and the article attracted the attention of Charles Sibley who invite ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Biological Interaction
In ecology, a biological interaction is the effect that a pair of organisms living together in a community have on each other. They can be either of the same species (intraspecific interactions), or of different species (interspecific interactions). These effects may be short-term, like pollination and predation, or long-term; both often strongly influence the evolution of the species involved. A long-term interaction is called a symbiosis. Symbioses range from mutualism, beneficial to both partners, to competition, harmful to both partners. Interactions can be indirect, through intermediaries such as shared resources or common enemies. This type of relationship can be shown by net effect based on individual effects on both organisms arising out of relationship. Several recent studies have suggested non-trophic species interactions such as habitat modification and mutualisms can be important determinants of food web structures. However, it remains unclear whether these findings g ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tso-hsin Cheng
Tso-hsin Cheng (郑作新 also transcribed as Zheng Zuoxin) (18 November 1906 – 27 June 1998) was a Chinese ornithologist known for his seminal work on the birds of China and mentoring a generation of researchers. Educated in the United States, he chose to stay in China after the Second World War while many of his academic colleagues moved to Taiwan. He was severely punished during the Cultural Revolution despite being a member of the Communist Party. Biography Early life Cheng was born in Fujian on November 18, 1906, and grew up with an interest in the local birds. His mother died of tuberculosis when he was very young and he was taken care of mostly by his grandmother. His father was one of the few Chinese with a higher education and knew English. His father taught him to speak English. As a young boy he was weak and his father encouraged the boy to take up sports. Cheng hiked in the mountains, played tennis and even became a champion 100 m sprinter. His early naturalist int ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Conspecific
Biological specificity is the tendency of a characteristic such as a behavior or a biochemical variation to occur in a particular species. Biochemist Linus Pauling stated that "Biological specificity is the set of characteristics of living organisms or constituents of living organisms of being special or doing something special. Each animal or plant species is special. It differs in some way from all other species...biological specificity is the major problem about understanding life." Biological specificity within ''Homo sapiens'' ''Homo sapiens'' has many characteristics that show the biological specificity in the form of behavior and morphological traits. Morphologically, humans have an enlarged cranial capacity and more gracile features in comparison to other hominins. The reduction of dentition is a feature that allows for the advantage of adaptability in diet and survival. As a species, humans are culture dependent and much of human survival relies on the culture and so ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
British India
The provinces of India, earlier presidencies of British India and still earlier, presidency towns, were the administrative divisions of British governance on the Indian subcontinent. Collectively, they have been called British India. In one form or another, they existed between 1612 and 1947, conventionally divided into three historical periods: *Between 1612 and 1757 the East India Company set up Factory (trading post), factories (trading posts) in several locations, mostly in coastal India, with the consent of the Mughal emperors, Maratha Empire or local rulers. Its rivals were the merchant trading companies of Portugal, Denmark, the Netherlands, and France. By the mid-18th century, three ''presidency towns'': Madras, Bombay and Calcutta, had grown in size. *During the period of Company rule in India (1757–1858), the company gradually acquired sovereignty over large parts of India, now called "presidencies". However, it also increasingly came under British government over ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Karl Ernst Von Baer
Karl Ernst Ritter von Baer Edler von Huthorn ( – ) was a Baltic German scientist and explorer. Baer was a naturalist, biologist, geologist, meteorologist, geographer, and is considered a, or the, founding father of embryology. He was a member of the Russian Academy of Sciences, a co-founder of the Russian Geographical Society, and the first president of the Russian Entomological Society, making him one of the most distinguished Baltic German scientists. Life Karl Ernst von Baer was born into the Baltic German noble Baer family ( et) in the Piep Manor ( et), Jerwen County, Governorate of Estonia (in present-day Lääne-Viru County, Estonia), as a knight by birthright. His patrilineal ancestors were of Westphalian origin and originated in Osnabrück. He spent his early childhood at Lasila manor, Estonia. He was educated at the Knight and Cathedral School in Reval (Tallinn) and the Imperial University of Dorpat (Tartu). In 1812, during his tenure at the uni ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Baltic German
Baltic Germans (german: Deutsch-Balten or , later ) were ethnic German inhabitants of the eastern shores of the Baltic Sea, in what today are Estonia and Latvia. Since their coerced resettlement in 1939, Baltic Germans have markedly declined as a geographically determined ethnic group. However, it is estimated that several thousand people with some form of (Baltic) German identity still reside in Latvia and Estonia. Since the Middle Ages, native German-speakers formed the majority of merchants and clergy, and the large majority of the local landowning nobility who effectively constituted a ruling class over indigenous Latvian and Estonian non-nobles. By the time a distinct Baltic German ethnic identity began emerging in the 19th century, the majority of self-identifying Baltic Germans were non-nobles belonging mostly to the urban and professional middle class. In the 12th and 13th centuries, Catholic German traders and crusaders (''see '') began settling in the eastern ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Common Name
In biology, a common name of a taxon or organism (also known as a vernacular name, English name, colloquial name, country name, popular name, or farmer's name) is a name that is based on the normal language of everyday life; and is often contrasted with the scientific name for the same organism, which is Latinized. A common name is sometimes frequently used, but that is not always the case. In chemistry, IUPAC defines a common name as one that, although it unambiguously defines a chemical, does not follow the current systematic naming convention, such as acetone, systematically 2-propanone, while a vernacular name describes one used in a lab, trade or industry that does not unambiguously describe a single chemical, such as copper sulfate, which may refer to either copper(I) sulfate or copper(II) sulfate. Sometimes common names are created by authorities on one particular subject, in an attempt to make it possible for members of the general public (including such interested par ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
