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Austroglanis Barnardi
General ''Austroglanis barnardi'' is an endangered species of catfish (order Siluriformes). It is one of three members of the family Austroglanididae. It is also known as the spotted rock-catfish or Barnard's rock-catfish. Biology Not much is known about the biology of ''A. barnardi'' because of the discovery being so recent. It has a 12-year generation time but nothing more is known about reproduction within the species. It feeds on aquatic insects, benthic invertebrates and other small fishes. Habitat This species is endemic to South Africa and is found only in freshwater bodies of subtropical climate. It has only been recorded from the Thee, Noordhoeks and Hex Rivers, which are all small tributaries of the Clanwilliam Olifants River System in the Western Cape, South Africa. It is extremely uncommon in these two streams it inhabits. ''A. barnardi'' inhabits riffles among loosely bedded rocks and coarse sand. Its preferred water depth is between 10-60 centimeters. Other sp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paul H
Paul may refer to: *Paul (given name), a given name (includes a list of people with that name) *Paul (surname), a list of people People Christianity *Paul the Apostle (AD c.5–c.64/65), also known as Saul of Tarsus or Saint Paul, early Christian missionary and writer *Pope Paul (other), multiple Popes of the Roman Catholic Church *Saint Paul (other), multiple other people and locations named "Saint Paul" Roman and Byzantine empire *Lucius Aemilius Paullus Macedonicus (c. 229 BC – 160 BC), Roman general *Julius Paulus Prudentissimus (), Roman jurist *Paulus Catena (died 362), Roman notary *Paulus Alexandrinus (4th century), Hellenistic astrologer *Paul of Aegina or Paulus Aegineta (625–690), Greek surgeon Royals *Paul I of Russia (1754–1801), Tsar of Russia *Paul of Greece (1901–1964), King of Greece Other people *Paul the Deacon or Paulus Diaconus (c. 720 – c. 799), Italian Benedictine monk *Paul (father of Maurice), the father of Maurice, Byzan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Generation Time
In population biology and demography, generation time is the average time between two consecutive generations in the lineages of a population. In human populations, generation time typically ranges from 22 to 33 years. Historians sometimes use this to date events, by converting generations into years to obtain rough estimates of time. Definitions and corresponding formulas The existing definitions of generation time fall into two categories: those that treat generation time as a renewal time of the population, and those that focus on the distance between individuals of one generation and the next. Below are the three most commonly used definitions: The time it takes for the population to grow by a factor of its net reproductive rate The net reproductive rate \textstyle R_0 is the number of offspring an individual is expected to produce during its lifetime (a net reproductive rate of 1 means that the population is at its demographic equilibrium). This definition envisions the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Habitat Destruction
Habitat destruction (also termed habitat loss and habitat reduction) is the process by which a natural habitat becomes incapable of supporting its native species. The organisms that previously inhabited the site are displaced or dead, thereby reducing biodiversity and species abundance. Habitat destruction is the leading cause of biodiversity loss. Fragmentation and loss of habitat have become one of the most important topics of research in ecology as they are major threats to the survival of endangered species. Activities such as harvesting natural resources, industrial production and urbanization are human contributions to habitat destruction. Pressure from agriculture is the principal human cause. Some others include mining, logging, trawling, and urban sprawl. Habitat destruction is currently considered the primary cause of species extinction worldwide. Environmental factors can contribute to habitat destruction more indirectly. Geological processes, climate change, introdu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Austroglanididae
''Austroglanis'' is the only genus in the catfish family Austroglanididae. This family was split off from the Bagridae catfish family. All three species of catfishes in the family Austroglanididae are endemic to southern Africa (South Africa and Namibia), and two species are threatened. These fish have three pairs of barbels (they lack nasal barbels). They have strong dorsal and pectoral fin spines. The adipose fin is small. Species There are currently three described species in this genus: * ''Austroglanis barnardi'' ( P. H. Skelton, 1981) (Barnard's rock-catfish) * ''Austroglanis gilli'' (Barnard, 1943) (Clanwilliam catfish) * ''Austroglanis sclateri The rock-catfish, ''Austroglanis sclateri'', is a species of catfish in the family Austroglanididae. This freshwater fish is endemic to the Vaal River in South Africa. It is also found in Lesotho and Namibia Namibia (, ), officially the Re ...'' ( Boulenger, 1901) (Rock-catfish) References Austroglanididae Cat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
