What type of mollusc is an environmental indicator?
402632
Probably many molluscs would make good environmental indicators (depending on what specific feature you are studying).  Most often I've heard of bivalves being used to indicate heavy metal pollution.  This is likely due to their method of feeding.  (Read more about Bivalves - http://en.wikipedia.org/wiki/Bivalve )\n\nHere is one example of how several molluscs were studied to see which was the best indicator of heavy metals:\n\n"The relationships between concentrations of the heavy metals Pb, Cd, Cu, Zn, Co, Ni, and Ag in nine bivalve molluscs (Arca ventricosa, Chama isotoma: Lithophaga teres. Pinctada margiritifera, Pycnodonte hyotis. Spondylus ducalis. Modiolus auriculatus, Trichomya hirsuta, Ustularca renuta) and their environment were studied."\n\nThere determinations were...\n\n"Accumulation of Pb and Cd by T. hirsuta was linear with time and increased in direct proportion to the external concentration of these metals. No loss of either metal was detected after 12 days in 'normal' seawater."\n\nFrom:  "Investigations of the potential of bivalve molluscs as indicators of heavy metal levels in tropical marine waters"  http://www.publish.csiro.au/nid/126/paper/MF9820285.htm\n\nFrom WikiPedia (in general):\n"Indicator species are unique environmental indicators as they offer a signal of the biological condition in a watershed or ecosystem, and are a warning system that pollution has entered the food web.\nThe term indicator species is a bit misleading, as indicators are often whole groups of flora/fauna types which can be used to assess environmental condition.  Most indicator species are fish, invertebrates, periphyton and macrophytes."\nhttp://en.wikipedia.org/wiki/Indicator_species\n\nCheers!
1053342
Could be...\n\nAtlantic white shrimp (Penaeus setiferus)\nPacific white shrimp (Litopenaeus vannamei)\nIndian white shrimp (Penaeus indicus)
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See the web page\nhttp://www.auburn.edu/~alleykd/envirolitigators/gangatext.htm
364242
Is it the definition for Phylum Mollusca that you are looking for?\n\n Anyway..try this : http://www.answers.com/topic/mollusk
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Animal behavior study. A transmitter is attached to a birds leg, a deer's neck. This helps to determine if animals move out of the habitat which they were born.\n\nUsed to record wild life in a given area, sound and pictures as animals move tripping a motion detector.\n\nEarthquake detection:\nAlso, to detect ground motion near fault lines such as in California or on volcanic mountains which may errupt. Also, detection for sulpher contamination which is another indicator.\n\nTsunami warning:\nAs a tsunami detection in the ocean. Yes, the US has used detectors as far back as in 1941. Not all countries support the need which could have saved lives if used in the India Ocean.\nCheck out the following link on buoy use for detection:
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Environmental protection agency?\nBiology teacher in high schools?
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www.aquaticecosystems.com
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B - Habitat degradation would be the closest I would say. \n\nBut, environmental degradation would be a better answer:\nIt is related to the deterioration of the environment both in terms of quantity and extinction of some wildlife species and quality like air, water or land pollution.
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Marine invertebrates usually consist of the phylum porifera, cnideria, coelenterata, arthropoda and mollusca.\nInvertebrates like zooplankton are the major source of food for marine filter feeders like whales. Sponges are known for their beauty and some sponges are used as bath sponges.Jelly fish are useful scavengers.Arthropoda are widely used by humans as seafood -- namely crabs, prawns, lobsters etc. Mollusca are also used as seafood, and for the immensely profitable pearl industry.
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Environmental Science
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Lichens are sensitive to atmospheric pollution, particularly to sulphur dioxide. Some are more sensitive than others. This makes them ideal as indicators of pollution since the abundance of different types at a location almost directly indicates the level of pollution.\n\nThere many books, papers, studies, etc. starting with a title something like, 'Lichens as indicators of pollution'.\n\nA quick and easy check on air quality is to look for the 'leafy' lichens (often grey) and those that look like blobs of fine string (green/grey). If there are virtually no lichens nearby, then you ought to move house!
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Seashells are formed by layers of calcium carbonate, covered by a thin organic surface layer, the periostracum.\n\nCalcium carbonate may occur as two different minerals: calcite and aragonite. Calcite is more stable, but aragonite is harder than calcite. Calcite is the main shell component in oysters; whereas aragonite is more important in freshwater and land snails. Many marine molluscs have alternate layers of both minerals. \n\nThe periostracum is formed by a type of conchin (quinone-tanned proteins, somewhat similar to insect exoskeleton). Conchin may also be incorporated in the mineralized layers.
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Good for the environment.
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They are arachnids, not crustaceans. Easy to find on the Indian Ocean shores. Dead animals eaters. Breath using gills, two sexed animals, egg layers, free swimmers. Outstanding feature: their blood is used as a reactive in a positive detection of human encephalitis.\n\nmore info: Barnes book of invertebrates
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That must be another cephalopod, an ammonite. There's an amazing diversity of these fossil mollusks, with many genera and species. \nPictures:\nhttp://home.tele2.fr/hildoceras/Amaltheus_causses.jpg\nhttp://www.mnhn.fr/expo/agesterre/ammonites.jpg\n\nBut ammonites are grey only because they're fossil (i.e. made of stone), I don't think ammonites were that color while they lived.
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Please check:\nhttp://en.wikipedia.org/wiki/Environmental_organization
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The only one I can think of is the shellfish called mussels.\n\nThese links should help you figure it out.