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Neocalanus
''Neocalanus'' is a genus of marine copepods. They are a dominant component of the open water ecosystems of the northern Pacific Ocean. ''Neocalanus'' are large copepods, reaching body lengths (i.e., prosome length) of more than in ''Neocalanus plumchrus''. Species There are six species: Life cycle ''Neocalanus flemingeri'' ''Neocalanus flemingeri'' is predominantly annual, with a significant fraction of biennial plant, biennials in some areas. The largest females reach prosome length of about ; males are smaller. Trophic interactions ''Neocalanus'' are important food items for many predators, such as North Pacific right whale and least auklet. References Calanoida Crustacean genera Taxa named by Georg Ossian Sars {{copepod-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Neocalanus Plumchrus
''Neocalanus plumchrus'' is a large species of copepod found in the Pacific and Arctic Oceans. It was species description, described in 1921 H. by Marukawa. ''Neocalanus flemingeri, N. flemingeri'' was formerly considered as conspecific, likely as a form (zoology), form, until it was split in 1988 by Charles B. Miller. Taxonomy and etymology ''Neocalanus plumchrus'' was originally described by Marukawa in 1921. It was eventually moved by Janet Bradford and John Jillett in 1974 from the genus ''Calanus'' to its current placement in ''Neocalanus''. The species ''Neocalanus flemingeri, N. flemingeri'' was split out of this species in 1988, where it is considered by Charles B. Miller to have been placed as form (zoology), f. ''typica''. Description ''Neocalanus plumchrus'' is considered a large copepod, with females generally ranging from about in length. The males are usually between about in length. Stage V copepodites usually are more than in length. The females of ''N. plumchr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Neocalanus Gracilis
''Neocalanus'' is a genus of marine copepods. They are a dominant component of the open water ecosystems of the northern Pacific Ocean. ''Neocalanus'' are large copepods, reaching body lengths (i.e., prosome length) of more than in ''Neocalanus plumchrus''. Species There are six species: Life cycle ''Neocalanus flemingeri'' ''Neocalanus flemingeri'' is predominantly annual, with a significant fraction of biennials in some areas. The largest females reach prosome length of about ; males are smaller. Trophic interactions ''Neocalanus'' are important food items for many predators, such as North Pacific right whale The North Pacific right whale (''Eubalaena japonica'') is a very large, thickset baleen whale species that is extremely rare and endangered. The Northeast Pacific population, which summers in the southeastern Bering Sea and Gulf of Alaska, may ... and least auklet. References Calanoida Crustacean genera Taxa named by Georg Ossian Sars {{copepod-s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Neocalanus Cristatus
''Neocalanus cristatus'' is a species of copepod found primarily in the northern Pacific. Description The female usually ranges in length from about . The male usually is between about in length. Distribution ''Neocalanus cristatus'' is found in the northern Pacific and, in lesser numbers, in the Chukchi Sea and the Arctic Sea. It has also been recorded off of the coast of Chile. Ecology Life cycle and reproduction Although ''N. cristatus'' breeds year round, it peaks in terms of reproductive activity from October to December. Breeding occurs at depth; at Station P, adults reproduce at depths below . At Site H, off of the east coast of Hokkaido, adults reproduce at depths below . Here, adults are usually located from about in depth. After being spawned, the nauplii ascend to the surface. During this ascent, they develop into stage VI nauplii or stage I copepodites. According to studies in a laboratory with water at , it takes about 40 days for this development to happen. Th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
North Pacific Right Whale
The North Pacific right whale (''Eubalaena japonica'') is a very large, thickset baleen whale species that is extremely rare and endangered. The Northeast Pacific population, which summers in the southeastern Bering Sea and Gulf of Alaska, may have no more than 40 animals. A western population that summers near the Commander Islands, the coast of Kamchatka, along the Kuril Islands and in the Sea of Okhotsk is thought to number in the low hundreds. Before commercial whaling in the North Pacific (i.e. pre-1835) there were probably over 20,000 right whales in the region. The taking of right whales in commercial whaling has been prohibited by one or more international treaties since 1935. Nevertheless, between 1962 and 1968, illegal Soviet whaling killed at least 529 right whales in the Bering Sea and the Gulf of Alaska as well as at least 132 right whales in the Sea of Okhotsk, plus an additional 104 North Pacific right whales from unspecified areas. The International Union for Con ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Least Auklet
The least auklet (''Aethia pusilla'') is a seabird and the smallest species of auk. It is the most abundant seabird in North America, and one of the most abundant in the world, with a population of around nine million birds. They breed on the islands of Alaska and Siberia, and spend the winter close to the edge of the ice sheet. Their largest colonies are on the Aleutian Islands, St. Lawrence Island and Little Diomede Island. Diet and feeding Least auklets feed predominantly on calanoid copepods, particularly those of the genus ''Neocalanus''. They also eat euphausiids, pteropods and other zooplankton species. They hunt for these in stratified waters caused where upwelling and thermoclines cause these prey items to be tightly clumped together. Like all auks they are pursuit divers, using their wings to provide thrust and "fly" under the water. They are voracious predators, consuming 86% of their body weight each day. Breeding Least auklets are highly colonial, nesting in r ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Georg Ossian Sars
Prof Georg Ossian Sars HFRSE (20 April 1837 – 9 April 1927) was a Norway, Norwegian marine biology, marine and freshwater biology, freshwater biologist. Life Georg Ossian Sars was born on 20 April 1837 in Kinn (former municipality), Kinn, Norway (now part of Flora, Norway, Flora), the son of Pastor Michael Sars and Maren Sars; the historian Ernst Sars was his elder brother, and the singer and women's skiing pioneer Eva Nansen was his younger sister.Google Translate He grew up in Manger, Norway, Manger, Hordaland, where his father was the local priest. He studied from 1852 to 1854 at Bergen Cathedral School, from 1854 at Oslo Cathedral School, Christiania Cathedral School, and joined the university at Christiana (now the University of Oslo) in 1857. He indulged his interest in natural history while studying medicine; having collected water fleas in local lakes with Wilhelm Lilljeborg's works, he discovered new species, and this resulted in his first scientific publication. Geor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
James Dwight Dana
James Dwight Dana Royal Society of London, FRS FRSE (February 12, 1813 – April 14, 1895) was an American geologist, mineralogist, volcanologist, and zoologist. He made pioneering studies of mountain-building, volcano, volcanic activity, and the origin and structure of continents and oceans around the world. His zoological author abbreviation is Dana. Early life and career Dana was born February 12, 1813, in Utica, New York. His father was merchant James Dana (1780–1860) and his mother was Harriet Dwight (1792–1870). Through his mother he was related to the Dwight New England family of missionaries and educators including uncle Harrison Gray Otis Dwight and first cousin Henry Otis Dwight. He showed an early interest in science, which had been fostered by Fay Edgerton, a teacher in the Utica high school, and in 1830 he entered Yale College in order to study under Benjamin Silliman the elder. Graduating in 1833, for the next two years he was teacher of mathematics to midshi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Copepod
Copepods (; meaning 'oar-feet') are a group of small crustaceans found in nearly every freshwater and saltwater habitat (ecology), habitat. Some species are planktonic (living in the water column), some are benthos, benthic (living on the sediments), several species have Parasitism, parasitic phases, and some continental species may live in limnoterrestrial habitats and other wet terrestrial places, such as swamps, under leaf fall in wet forests, bogs, springs, ephemeral ponds, puddles, damp moss, or water-filled recesses of plants (phytotelmata) such as bromeliads and pitcher plants. Many live underground in marine and freshwater caves, sinkholes, or stream beds. Copepods are sometimes used as Ecological indicator, biodiversity indicators. As with other crustaceans, copepods have a larval form. For copepods, the egg hatches into a Crustacean larvae#Nauplius, nauplius form, with a head and a tail but no true thorax or abdomen. The larva molts several times until it resembles the a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pacific Ocean
The Pacific Ocean is the largest and deepest of Earth's five Borders of the oceans, oceanic divisions. It extends from the Arctic Ocean in the north to the Southern Ocean, or, depending on the definition, to Antarctica in the south, and is bounded by the continents of Asia and Australia in the west and the Americas in the east. At in area (as defined with a southern Antarctic border), the Pacific Ocean is the largest division of the World Ocean and the hydrosphere and covers approximately 46% of Earth's water surface and about 32% of the planet's total surface area, larger than its entire land area ().Pacific Ocean . ''Encyclopædia Britannica, Britannica Concise.'' 2008: Encyclopædia Britannica, Inc. The centers of both the Land and water hemispheres, water hemisphere and the Western Hemisphere, as well as the Pole of inaccessi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
