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Gwyniad
The gwyniad (''Coregonus pennantii''), or Welsh whitefish, is a species of freshwater Actinopterygii, ray-finned fish belonging to the Family (biology), family Salmonidae, which includes the salmon, trouts and related fishes. This species is Endemism, endemic to a single lake in northern Wales. Taxonomy The gwyniad was first formally Species description, described in 1848 by the French zoologist Achille Valenciennes in volume 21 of the ''Histoire naturelle des poissons'', cowritten with Georges Cuvier. Valenciennes gave the Type locality (biology), type locality as Wales. This fish is classified in the Holarctic realm, Holarctic Whitefish (genus), whitefish genus ''Coregonus'' which is classified in the subfamily Coregoninae of the family Salmonidae. The taxonomy of the genus ''Coregonus'' is disputed; some authorities assign the gwyniad to the common whitefish (''Coregonus lavaretus''), and a morphological review in 2012 was unable to find any solid evidence for recognizing th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Llyn Arenig Fawr
{{Gwynedd-geo-stub ...
Llyn Arenig Fawr is a lake and reservoir located to the northeast of Arenig Fawr, a mountain in North Wales. The reservoir's primary purpose is to supply water to the nearby town of Bala and the numerous small villages in the surrounding area. From the lake there is an energetic uphill walk to the summit of Arenig Fawr, from which there are extensive views. Eggs of the gwyniad, a freshwater fish previously restricted to nearby Bala Lake, were introduced to Llyn Arenig Fawr between 2003 and 2007 as a conservation measure. References External linksPhotos of Llyn Arenig Fawr and surrounding areaon geograph.org.uk Llanycil Arenig Fawr Arenig Fawr is a mountain in Snowdonia, North Wales, close to Llyn Celyn reservoir, alongside the A4212 road, A4212 between Trawsfynydd and Bala, Gwynedd, Bala. Location Arenig Fawr is the highest member of the Arenigs, Arenig range, with , a smaller nei ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Powan
The powan (''Coregonus clupeoides'') is a kind of freshwater whitefish endemic to two lochs in Scotland, Loch Lomond and Loch Eck. It has been successfully introduced in two other sites, Loch Sloy Hydro-Electric Scheme, Loch Sloy and the Carron Valley Reservoir. Powan populations are relatively healthy, but may have been negatively impacted by the introduced ruffe, which eats powan eggs and fry. As a conservation action, an attempt to establish populations in four additional lochs has been undertaken. The taxonomic status of the British whitefish populations, including powan, is a matter of debate. Currently the Scottish powan, along with the Welsh gwyniad known from a single lake, and four similar populations in England known as schelly, are generally considered belonging to the widespread Eurasian common whitefish (''Coregonus lavaretus''). This accords with the close genetic similarity among these units, and the absence of clear morphological differences between them. FishBase ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Common Whitefish
''Coregonus lavaretus'' is a species of freshwater whitefish, in the family Salmonidae. It is the type species of its genus ''Coregonus''. There are widely different concepts about the delimitation of the species ''Coregonus lavaretus'' and about the number of species in the genus ''Coregonus'' in general. Lavaret In a narrow sense, ''Coregonus lavaretus'', or the lavaret, is considered to be endemic to Lake Bourget and Lake d'Aiguebelette in the Rhône river basin in France, whereas it formerly also occurred in Lake Geneva. According to this view there is a great number of distinct whitefish species in lakes, rivers and brackish waters of Central and Northern Europe. European whitefish (common whitefish) In the broad sense, ''Coregonus lavaretus'', in English referred to as the common whitefish or European whitefish, is widespread from central and northwest Europe to Siberia. Often called the ''C. lavaretus'' complex and considered as a superspecies, it encompasses many of t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Coregonus
''Coregonus'' is a diverse genus of fish in the salmon family (Salmonidae). The ''Coregonus'' species are known as whitefishes. The genus contains at least 68 described extant taxa, but the true number of species is a matter of debate. The type species of the genus is '' Coregonus lavaretus''. Most ''Coregonus'' species inhabit lakes and rivers, and several species, including the Arctic cisco (''C. autumnalis''), the Bering cisco (''C. laurettae''), and the least cisco (''C. sardinella'') are anadromous, moving between salt water and fresh water. Many whitefish species or ecotypes, especially from the Great Lakes and the Alpine lakes of Europe, have gone extinct over the past century or are endangered. Among 12 freshwater fish considered extinct in Europe, 6 are ''Coregonus''. All ''Coregonus'' species are protected under appendix III of the Bern Convention,Council of Europe, 1979. Convention on the Conservation of European Wildlife and Natural Heritage. Be ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Naturalist
Natural history is a domain of inquiry involving organisms, including animals, fungi, and plants, in their natural environment, leaning more towards observational than experimental methods of study. A person who studies natural history is called a naturalist or natural historian. Natural history encompasses scientific research but is not limited to it. It involves the systematic study of any category of natural objects or organisms, so while it dates from studies in the ancient Greco-Roman world and the mediaeval Arabic world, through to European Renaissance naturalists working in near isolation, today's natural history is a cross-discipline umbrella of many specialty sciences; e.g., geobiology has a strong multidisciplinary nature. Definitions Before 1900 The meaning of the English term "natural history" (a calque of the Latin ''historia naturalis'') has narrowed progressively with time, while, by contrast, the meaning of the related term "nature" has widened (see also ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pupil
The pupil is a hole located in the center of the iris of the eye that allows light to strike the retina.Cassin, B. and Solomon, S. (1990) ''Dictionary of Eye Terminology''. Gainesville, Florida: Triad Publishing Company. It appears black because light rays entering the pupil are either absorbed by the tissues inside the eye directly, or absorbed after diffuse reflections within the eye that mostly miss exiting the narrow pupil. The size of the pupil is controlled by the iris, and varies depending on many factors, the most significant being the amount of light in the environment. The term "pupil" was coined by Gerard of Cremona. In humans, the pupil is circular, but its shape varies between species; some cats, reptiles, and foxes have vertical slit pupils, goats and sheep have horizontally oriented pupils, and some catfish have annular types. In optical terms, the anatomical pupil is the eye's aperture and the iris is the aperture stop. The image of the pupil as seen from o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Specific Name (zoology)
In zoological nomenclature, the specific name (also specific epithet, species epithet, or epitheton) is the second part (the second name) within the scientific name of a species (a binomen). The first part of the name of a species is the name of the genus or the generic name. The rules and regulations governing the giving of a new species name are explained in the article species description. For example, the scientific name for humans is ''Homo sapiens'', which is the species name, consisting of two names: ''Homo'' is the " generic name" (the name of the genus) and ''sapiens'' is the "specific name". Etymology Historically, ''specific name'' referred to the combination of what are now called the generic and specific names. Carl Linnaeus, who formalized binomial nomenclature, made explicit distinctions between specific, generic, and trivial names. The generic name was that of the genus, the first in the binomial, the trivial name was the second name in the binomial, and the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thomas Pennant
Thomas Pennant (16 December 1798) was a Welsh natural history, naturalist, traveller, writer and antiquarian. He was born and lived his whole life at his family estate, Downing Hall, near Whitford, Flintshire, in Wales. As a naturalist he had a great curiosity, observing the geography, geology, plants, animals, birds, reptiles, amphibians, and fish around him and recording what he saw and heard about. He wrote acclaimed books including ''British Zoology'', the ''History of Quadrupeds'', ''Arctic Zoology'' and ''Indian Zoology'' although he never travelled further afield than continental Europe. He knew and maintained correspondence with many of the scientific figures of his day. His books influenced the writings of Samuel Johnson. As an antiquarian, he amassed a considerable collection of art and other works, largely selected for their scientific interest. Many of these works are now housed at the National Library of Wales. As a traveller he visited Scotland and many other par ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Author
In legal discourse, an author is the creator of an original work that has been published, whether that work exists in written, graphic, visual, or recorded form. The act of creating such a work is referred to as authorship. Therefore, a sculptor, painter, or composer is considered the author of their respective sculptures, paintings, or musical compositions. Although in common usage, the term "author" is often associated specifically with the writer of a book, Article (publishing), article, Play (theatre), play, or other written work. In cases involving a work for hire, the employer or commissioning party is legally considered the author of the work, even if it was created by someone else. Typically, the first owner of a copyright is the creator of the copyrighted work, i.e., the author. If more than one person created the work, then joint authorship has taken place. Copyright laws differ around the world. The United States Copyright Office, for example, defines copyright as "a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
IUCN
The International Union for Conservation of Nature (IUCN) is an international organization working in the field of nature conservation and sustainable use of natural resources. Founded in 1948, IUCN has become the global authority on the status of the natural world and the measures needed to safeguard it. It is involved in data gathering and Data analysis, analysis, research, field projects, advocacy, and education. IUCN's mission is to "influence, encourage and assist societies throughout the world to conserve nature and to ensure that any use of natural resources is equitable and ecologically sustainable". Over the past decades, IUCN has widened its focus beyond conservation ecology and now incorporates issues related to sustainable development in its projects. IUCN does not itself aim to mobilize the public in support of nature conservation. It tries to influence the actions of governments, business and other stakeholders by providing information and advice and through buildin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
