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Asterias Forbesi
''Asterias forbesi'', commonly known as Forbes sea star, is a species of starfish in the family Asteriidae. It is found in shallow waters in the northwest Atlantic Ocean and the Caribbean Sea. Description left, Underside of ''Asterias forbesi'' ''Asterias forbesi'' usually has 5 arms but occasionally has 4 or 6. Like many starfish species, the upper surface is covered in blunt conical projections giving it a rough feel. Some of these are pedicellariae, minute pincers that can grip objects. The arms are plump, broad at the base and tapering to a blunt tip. This starfish grows to about in diameter with an arm length of about . The madreporite is usually pink and is visible near the edge of the disc. There are several rows of tube feet on the underside on either side of the ambulacral groove that run down the centre of each arm. The colour of the upper side is variable, ranging from brown or tan to reddish-purple and the underside is usually pale brown. Near the tip on the undersid ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pierre Jean Édouard Desor
Pierre Jean Édouard Desor (13 February 1811, Friedrichsdorf, Grand Duchy of Hesse23 February 1882) was a German-Swiss geologist and naturalist. Biography Desor studied law at Giessen and Heidelberg, was compromised in the republican movements of 1832/3 (see, for example, Hambach Festival and Frankfurter Wachensturm), and escaped to Paris. Here his attention was drawn to geology. He made excursions with Élie de Beaumont, and in 1837 met Louis Agassiz at a meeting of naturalists in Neufchâtel. With Gressli and Vogt, Desor became an active collaborator with Agassiz, studying palaeontology and glacial phenomena, and contributing the essays for vol. iii. of Agassiz's ''Monographie d'echinodermes vivants et fossiles'' (Neufchâtel, 1842). Desor also published ''Excursions et sejours dans les glaciers et les hautes régions des Alpes de M. Agassiz et de ses compagnons de voyage'' (Neufchâtel, 1844). Together with James David Forbes, Desor ascended the Jungfrau in 1841. He was in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cape Hatteras
Cape Hatteras is a cape located at a pronounced bend in Hatteras Island, one of the barrier islands of North Carolina. Long stretches of beach, sand dunes, marshes, and maritime forests create a unique environment where wind and waves shape the topography. A large area of the Outer Banks is part of a National Park, called the Cape Hatteras National Seashore. It is also the nearest landmass on the North American mainland to Bermuda, which is about to the east-southeast. The treacherous waters off the coast of the Outer Banks are known as the Graveyard of the Atlantic, Over 600 ships wrecked here as victims of shallow shoals, storms, and war. Diamond Shoals, a bank of shifting sand ridges hidden beneath the turbulent sea off Cape Hatteras, has never promised safe passage for ships. In the past 400 years, the graveyard has claimed many lives, but island villagers saved many. As early as the 1870s, villagers served in the United States Life-Saving Service. Others staffed lightho ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Long Island Sound
Long Island Sound is a marine sound and tidal estuary of the Atlantic Ocean. It lies predominantly between the U.S. state of Connecticut to the north and Long Island in New York to the south. From west to east, the sound stretches from the East River in New York City, along the North Shore of Long Island, to Block Island Sound. A mix of freshwater from tributaries and saltwater from the ocean, Long Island Sound is at its widest point and varies in depth from . Shoreline Major Connecticut cities on the Sound include Stamford, Norwalk, Bridgeport, New Haven, and New London. Cities on the New York side of the Sound include Rye, Glen Cove, New Rochelle, Larchmont and portions of Queens and the Bronx in New York City. Climate and geography The climate of Long Island Sound is warm temperate or Cfa in the Köppen climate classification. Summers are hot and humid often with convective showers and strong sunshine, while the cooler months feature cold temperatures and a mix o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Orchitophrya Stellarum
''Orchitophrya stellarum'' is a species of single-celled marine ciliates, a member of the class Oligohymenophorea. It is found living freely in the north Atlantic and Pacific Oceans but is also parasitic, being found inside the gonads of starfish. Biology ''Orchitophrya stellarum'' tolerates a sea temperature range of between and and a salinity range of between 2 and at least 30 parts per thousand of salt equivalent. The lower the temperature, the lower the acceptable level of salinity. Growth is most rapid at 24 °C. It is a facultative parasite of sea stars in the Asteriidae family. It seems to be able to survive in the open sea indefinitely as long as there is a supply of bacteria and tissue detritus on which it can feed. Parasitism ''Orchitophrya stellarum'' is often associated with sea stars and other invertebrates, living on their outer surface and feeding on sloughed-off epidermal tissue. It only appears to become parasitic when the male host starfish has ripe gona ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Zooplankton
Zooplankton are the animal component of the planktonic community ("zoo" comes from the Greek word for ''animal''). Plankton are aquatic organisms that are unable to swim effectively against currents, and consequently drift or are carried along by currents in the ocean, or by currents in seas, lakes or rivers. Zooplankton can be contrasted with phytoplankton, which are the plant component of the plankton community ("phyto" comes from the Greek word for ''plant''). Zooplankton are heterotrophic (other-feeding), whereas phytoplankton are autotrophic (self-feeding). This means zooplankton cannot manufacture their own food but must eat other plants or animals instead — in particular they eat phytoplankton. Zooplankton are generally larger than phytoplankton, most are microscopic, but some (such as jellyfish) are macroscopic and can be seen with the naked eye. Many protozoans (single-celled protists that prey on other microscopic life) are zooplankton, including zooflagellates, fo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bipinnaria
A bipinnaria is the first stage in the larval development of most starfish, and is usually followed by a brachiolaria stage. Movement and feeding is accomplished by the bands of cilia. Starfish that brood their young generally lack a bipinnaria stage, with the eggs developing directly into miniature adults The bipinnaria is free-living, swimming as part of the zooplankton. When it initially forms, the entire body is covered by cilia, but as it grows, these become confined to a narrow band forming a number of loops over the body surface. A pair of short, stubby arms soon develop on the body, with the ciliated bands extending into them. In addition to propelling the larva through the water, the cilia also catch suspended food particles, and deliver them to the mouth (more correctly called a ''stomodeum''). Eventually, three additional arms develop at the front end of the larva; at this point it becomes a brachiolaria. In some species, including the common starfish ''Asterias'', ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
HighBeam Research
HighBeam Research was a paid search engine and full text online archive owned by Gale, a subsidiary of Cengage, for thousands of newspapers, magazines, academic journals, newswires, trade magazines, and encyclopedias in English. It was headquartered in Chicago, Illinois. In late 2018, the archive was shut down. History The company was established in August 2002 after Patrick Spain, who had just sold Hoover's, which he had co-founded, bought eLibrary and Encyclopedia.com from Tucows. The new company was called Alacritude, LLC (a combination of Alacrity and Attitude). ELibrary had a library of 1,200 newspaper, magazine and radio/TV transcript archives that were generally not freely available. Original investors included Prism Opportunity Fund of Chicago and 1 to 1 Ventures of Stamford, Connecticut. Spain stated, "There was a glaring gap between free search like Google and high-end offerings like LexisNexis and Factiva." Later in 2002, it bought Researchville.com. By 2003, it ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Predation
Predation is a biological interaction where one organism, the predator, kills and eats another organism, its prey. It is one of a family of common feeding behaviours that includes parasitism and micropredation (which usually do not kill the host) and parasitoidism (which always does, eventually). It is distinct from scavenging on dead prey, though many predators also scavenge; it overlaps with herbivory, as seed predators and destructive frugivores are predators. Predators may actively search for or pursue prey or wait for it, often concealed. When prey is detected, the predator assesses whether to attack it. This may involve ambush or pursuit predation, sometimes after stalking the prey. If the attack is successful, the predator kills the prey, removes any inedible parts like the shell or spines, and eats it. Predators are adapted and often highly specialized for hunting, with acute senses such as vision, hearing, or smell. Many predatory animals, both vertebrate and inv ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mussel
Mussel () is the common name used for members of several families of bivalve molluscs, from saltwater and Freshwater bivalve, freshwater habitats. These groups have in common a shell whose outline is elongated and asymmetrical compared with other edible clams, which are often more or less rounded or oval. The word "mussel" is frequently used to mean the bivalves of the marine family Mytilidae, most of which live on exposed shores in the intertidal zone, attached by means of their strong Byssus, byssal threads ("beard") to a firm substrate. A few species (in the genus ''Bathymodiolus'') have colonised hydrothermal vents associated with deep ocean ridges. In most marine mussels the shell is longer than it is wide, being wedge-shaped or asymmetrical. The external colour of the shell is often dark blue, blackish, or brown, while the interior is silvery and somewhat nacreous. The common name "mussel" is also used for many freshwater bivalves, including the freshwater pearl mussels. F ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chemoreception
A chemoreceptor, also known as chemosensor, is a specialized sensory receptor which transduces a chemical substance (endogenous or induced) to generate a biological signal. This signal may be in the form of an action potential, if the chemoreceptor is a neuron, or in the form of a neurotransmitter that can activate a nerve fiber if the chemoreceptor is a specialized cell, such as taste receptors, or an internal peripheral chemoreceptor, such as the carotid bodies. In physiology, a chemoreceptor detects changes in the normal environment, such as an increase in blood levels of carbon dioxide (hypercapnia) or a decrease in blood levels of oxygen (hypoxia), and transmits that information to the central nervous system which engages body responses to restore homeostasis. In bacteria, chemoreceptors are essential in the mediation of chemotaxis. Cellular chemoreceptors In prokaryotes Bacteria utilize complex long helical proteins as chemoreceptors, permitting signals to travel long dis ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bivalvia
Bivalvia (), in previous centuries referred to as the Lamellibranchiata and Pelecypoda, is a class of marine and freshwater molluscs Mollusca is the second-largest phylum of invertebrate animals after the Arthropoda, the members of which are known as molluscs or mollusks (). Around 85,000 extant species of molluscs are recognized. The number of fossil species is estim ... 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, Cockle (bivalve), cockles, mussels, scallops, and numerous other family (biology), 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 Ctenidium (mollusc), ctenidia, specialised organs for feeding and breathing. Most bivalves bury themselves in sediment, where they a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cape Cod
Cape Cod is a peninsula extending into the Atlantic Ocean from the southeastern corner of mainland Massachusetts, in the northeastern United States. Its historic, maritime character and ample beaches attract heavy tourism during the summer months. The name Cape Cod, coined in 1602 by Bartholomew Gosnold, is the ninth oldest English place-name in the U.S. As defined by the Cape Cod Commission's enabling legislation, Cape Cod is conterminous with Barnstable County, Massachusetts. It extends from Provincetown in the northeast to Woods Hole in the southwest, and is bordered by Plymouth to the northwest. The Cape is divided into fifteen towns, several of which are in turn made up of multiple named villages. Cape Cod forms the southern boundary of the Gulf of Maine, which extends north-eastward to Nova Scotia. Since 1914, most of Cape Cod has been separated from the mainland by the Cape Cod Canal. The canal cuts roughly across the base of the peninsula, though small portions of the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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