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Paphies Ventricosa
''Paphies ventricosa'', or toheroa (a Māori word meaning "long tongue"), is a large bivalve mollusc of the family Mesodesmatidae, endemic to New Zealand. Distribution It is found in both the North and South Islands, but the main habitat is the west coast of the North Island. The best grounds are wide fine-sand beaches where there are extensive sand-dunes, enclosing freshwater, which percolates to the sea, there promoting the growth of diatoms and plankton. Description The toheroa is a very large shellfish with a solid white, elongated shell with the apex at the middle. Maximum length is 117 mm, height 81 mm, and thickness 38 mm. Human use The toheroa has long been a popular seafood, often made into a greenish soup, for which it has an international reputation. Toheroa were translocated across New Zealand by Māori using (kelp bags) made from southern bull kelp (''Durvillaea poha''). It was over-exploited in the 1950s and 1960s, and there has been a ban on ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
John Edward Gray
John Edward Gray, FRS (12 February 1800 – 7 March 1875) was a British zoologist. He was the elder brother of zoologist George Robert Gray and son of the pharmacologist and botanist Samuel Frederick Gray (1766–1828). The same is used for a zoological name. Gray was keeper of zoology at the British Museum in London from 1840 until Christmas 1874, before the natural history holdings were split off to the Natural History Museum. He published several catalogues of the museum collections that included comprehensive discussions of animal groups and descriptions of new species. He improved the zoological collections to make them amongst the best in the world. Biography Gray was born in Walsall, but his family soon moved to London, where Gray studied medicine. He assisted his father in writing ''The Natural Arrangement of British Plants'' (1821). After being blackballed by the Linnean Society of London, Gray shifted his interest from botany to zoology. He began his zoologica ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Plankton
Plankton are the diverse collection of organisms found in Hydrosphere, water (or atmosphere, air) that are unable to propel themselves against a Ocean current, current (or wind). The individual organisms constituting plankton are called plankters. In the ocean, they provide a crucial source of food to many small and large aquatic organisms, such as bivalves, fish and whales. Marine plankton include bacteria, archaea, algae, protozoa and drifting or floating animals that inhabit the saltwater of oceans and the brackish waters of estuaries. Freshwater plankton are similar to marine plankton, but are found in the freshwaters of lakes and rivers. Plankton are usually thought of as inhabiting water, but there are also airborne versions, the aeroplankton, that live part of their lives drifting in the atmosphere. These include plant spores, pollen and wind-scattered seeds, as well as microorganisms swept into the air from terrestrial dust storms and oceanic plankton swept into the air ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bivalves Of New Zealand
Bivalvia (), in previous centuries referred to as the Lamellibranchiata and Pelecypoda, is a class of marine and freshwater molluscs that have laterally compressed bodies enclosed by a shell consisting of two hinged parts. As a group, bivalves have no head and they lack some usual molluscan organs, like the radula and the odontophore. They include the clams, oysters, cockles, mussels, scallops, and numerous other families that live in saltwater, as well as a number of families that live in freshwater. The majority are filter feeders. The gills have evolved into ctenidia, specialised organs for feeding and breathing. Most bivalves bury themselves in sediment, where they are relatively safe from predation. Others lie on the sea floor or attach themselves to rocks or other hard surfaces. Some bivalves, such as the scallops and file shells, can swim. The shipworms bore into wood, clay, or stone and live inside these substances. The shell of a bivalve is composed of calcium c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Commercial Molluscs
Commercial may refer to: * a dose of advertising conveyed through media (such as - for example - radio or television) ** Radio advertisement ** Television advertisement * (adjective for:) commerce, a system of voluntary exchange of products and services ** (adjective for:) trade, the trading of something of economic value such as goods, services, information or money * Two functional constituencies in elections for the Legislative Council of Hong Kong: **Commercial (First) **Commercial (Second) * ''Commercial'' (album), a 2009 album by Los Amigos Invisibles * Commercial broadcasting * Commercial style or early Chicago school, an American architectural style * Commercial Drive, Vancouver, a road in Vancouver, British Columbia, Canada * Commercial Township, New Jersey, in Cumberland County, New Jersey See also * * Comercial (other), Spanish and Portuguese word for the same thing * Commercialism Commercialism is the application of both manufacturing and consumption towar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arthur William Baden Powell
Arthur William Baden Powell (4 April 1901 – 1 July 1987) was a New Zealand malacologist, naturalist and palaeontologist, a major influence in the study and classification of New Zealand molluscs through much of the 20th century. He was known to his friends and family by his third name, "Baden". Biography Early life The name Baden had been a given name in a Powell family since 1731, when Susannah Powell née Thistlethwayte (1696–1762) gave to her child (1731–1792) the maiden name of her mother, Susannah Baden (1663–1692). The name Baden, particularly when associated with the surname Powell, became famous in 1900–1901, the year Arthur William Baden Powell was born, because of the siege of Mafeking, the most famous British action in the Second Boer War, which turned the British commander of the besieged, Robert Baden-Powell, into a national hero. Throughout the British Empire, babies were named after him. No family connection has yet been established between Arthur W ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gas Bubble Disease
Gas bubble disease is a disease of fish that are exposed to water supersaturated with natural gases like oxygen, carbon dioxide, or nitrogen. Bubbles of gas may form in the eyes, skin, gills, and fins. It becomes prominent whenever there is a change in temperature and pressure in environments, aquatic turbulence, and a disturbance in biotic metabolisms. Signs and symptoms The gas bubble disease can be detected by the formation of small gas bubbles under the epidermis which includes the formation of gas bubbles in the skin, the gills and eyeballs causing exophtalmia. Gas bubbles may also form in extremities (fins), in the vascular system where they often cause embolism and in their mouth opening. The gas bubble disease may cause floating problems due to the excessive amount of gas in their bodies, ultimately leading to upside-down swimming and death. Gas bubble disease may also occur in humans and is commonly known as decompression sickness. It generally occurs in divers when th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Over-exploited
Overexploitation, also called overharvesting, refers to harvesting a renewable resource to the point of diminishing returns. Continued overexploitation can lead to the destruction of the resource, as it will be unable to replenish. The term applies to natural resources such as water aquifers, grazing pastures and forests, wild medicinal plants, fish stocks and other wildlife. In ecology, overexploitation describes one of the five main activities threatening global biodiversity. Ecologists use the term to describe populations that are harvested at an unsustainable rate, given their natural rates of mortality and capacities for reproduction. This can result in extinction at the population level and even extinction of whole species. In conservation biology, the term is usually used in the context of human economic activity that involves the taking of biological resources, or organisms, in larger numbers than their populations can withstand. The term is also used and defined some ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Durvillaea Poha
''Durvillaea poha'' is a large, robust species of southern bull kelp found in New Zealand. Discovery The species was previously classified as the "cape" lineage of ''Durvillaea antarctica'', but in 2012 it was recognised as a distinct species due to consistent genetic, morphological and ecological differences. In southern New Zealand, ''D. poha'' and ''D. antarctica'' frequently grow next to one another, although ''D. poha'' normally grows higher up or further back on rock platforms, or in more sheltered bays, where wave force is weaker. ''D. poha'' generally has wider fronds than ''D. antarctica'', and can appear more 'orange' across the frond area. Mitochondrial introgression has been observed between the two species, where some plants in Wellington exhibited the nuclear DNA of ''D. poha'' but also mitochondrial DNA belonging to ''D. antarctica''. Etymology The specific epithet is from pōhā, storage bags made by Māori out of kelp fronds. Description The species has wide, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pōhā
Pōhā are traditional Māori bags made from southern bull kelp, which are used to carry and store food and fresh water, to propagate live shellfish, and to make clothing and equipment for sports. Pōhā are especially associated with Ngāi Tahu, who have legally recognised rights for harvesting source species of kelp. Construction Blades from southern bull kelp (rimurapa in Māori) species such as ''Durvillaea antarctica'' and '' D. poha'' (named after the pōhā) were used to construct the bags. The kelp blades have a 'honeycomb' structure,Maggy WassilieffSeaweed - Bull kelp’s honeycombed structure ''Te Ara - the Encyclopedia of New Zealand'', Ministry of Culture and Heritage. Updated 2 March 2009. Retrieved 9 March 2010. which allows them to be split open, hollowed out (pōhā hau) and inflated into containers. Inflated blades are hung out to dry and then deflated and rolled up for transport. Tōtara bark can be used to cover and protect the bags. Uses Transport Pōhā are ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Māori People
The Māori (, ) are the indigenous Polynesian people of mainland New Zealand (). Māori originated with settlers from East Polynesia, who arrived in New Zealand in several waves of canoe voyages between roughly 1320 and 1350. Over several centuries in isolation, these settlers developed their own distinctive culture, whose language, mythology, crafts, and performing arts evolved independently from those of other eastern Polynesian cultures. Some early Māori moved to the Chatham Islands, where their descendants became New Zealand's other indigenous Polynesian ethnic group, the Moriori. Initial contact between Māori and Europeans, starting in the 18th century, ranged from beneficial trade to lethal violence; Māori actively adopted many technologies from the newcomers. With the signing of the Treaty of Waitangi in 1840, the two cultures coexisted for a generation. Rising tensions over disputed land sales led to conflict in the 1860s, and massive land confiscations, to which ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paphies Ventricosa
''Paphies ventricosa'', or toheroa (a Māori word meaning "long tongue"), is a large bivalve mollusc of the family Mesodesmatidae, endemic to New Zealand. Distribution It is found in both the North and South Islands, but the main habitat is the west coast of the North Island. The best grounds are wide fine-sand beaches where there are extensive sand-dunes, enclosing freshwater, which percolates to the sea, there promoting the growth of diatoms and plankton. Description The toheroa is a very large shellfish with a solid white, elongated shell with the apex at the middle. Maximum length is 117 mm, height 81 mm, and thickness 38 mm. Human use The toheroa has long been a popular seafood, often made into a greenish soup, for which it has an international reputation. Toheroa were translocated across New Zealand by Māori using (kelp bags) made from southern bull kelp (''Durvillaea poha''). It was over-exploited in the 1950s and 1960s, and there has been a ban on ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Diatom
A diatom (Neo-Latin ''diatoma''), "a cutting through, a severance", from el, διάτομος, diátomos, "cut in half, divided equally" from el, διατέμνω, diatémno, "to cut in twain". is any member of a large group comprising several genera of algae, specifically microalgae, found in the oceans, waterways and soils of the world. Living diatoms make up a significant portion of the Earth's biomass: they generate about 20 to 50 percent of the oxygen produced on the planet each year, take in over 6.7 billion metric tons of silicon each year from the waters in which they live, and constitute nearly half of the organic material found in the oceans. The shells of dead diatoms can reach as much as a half-mile (800 m) deep on the ocean floor, and the entire Amazon basin is fertilized annually by 27 million tons of diatom shell dust transported by transatlantic winds from the African Sahara, much of it from the Bodélé Depression, which was once made up of a system of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
