how are members of the plankton community differentiated?
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they are differenciated according to the depth and the place that they are found
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phytoplankton produce oxygen, not breathe it (A & B wrong)\nnekton are bigger than plankton so i don't think they feed off of them (C wrong)\nzooplankton feed on other plankton, which is technically what nekton is (by my guess D is right)
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http://myweb2.search.yahoo.com/search?ei=utf-8&fr=slv8-frz&p=marin%20biodiversity
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Many of the microorganisms in the pond water are actually plants.\n\nThe microscopic organisms living in the water column are usually refered to as plankton.  The phytoplankton are the microscopic plants, while the zooplankton are the microscopic animals.  The phytoplankton are the majority of the mass, mostly single celled algae and diatoms.
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Use the Linnaeus System:\n\nKingdom Phylum Class Order Family Genus Species\n\nA way to remember it: Katie Put Clams On Fred's Giant Stomach. I learned it in HS Biology 30+ years ago and never have forgotten it.
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The Palaearctic Habitat Classification is the successor to the CORINE Biotopes Habitat Classification, and has been developed by the Royal Belgian Institute of Natural Sciences. \n\nIt has been extended to cover the whole Palearctic region. The great majority of habitat types in the Palaearctic Habitat Classification have been included in the EUNIS habitat classification. \n\nAnd that's all I know. :)
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Biodiversity or biological diversity is the diversity of life. There are a number of definitions and measures of biodiversity.\n\nIn ecology, an ecosystem is a combination of all the living and non-living elements of an area. Ecosystems are the smallest level of organization in nature that incorporates both living and nonliving factors. They can range in scale from a wide geographical area such as the Sahara Desert to something small as a puddle. The term microecosystem may be used to describe a very small (often closed) ecosystem.\nIn general terms an ecological system can be thought of as an assemblage of organisms (plant, animal and other living organisms—also referred to as a biotic community or biocoenosis) living together with their environment (or biotope), functioning as a loose unit. That is, a dynamic and complex whole, interacting as an "ecological unit."\nYou can see the Terrestrial biomes in\nhttp://en.wikipedia.org/wiki/Category:Terrestrial_biomes
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These are single-celled (unicellular) organisms, and\nhave a well-defined membrane-bound nucleus.\nTheir modes of nutrition may be quite varied.\n• Active feeders: Some protists like Amoeba and\nParamecium (Fig. 23.5) ingest food like most\nanimals. Very often these are also referred to as\nProtozoa (protos: primitive, zoon: animal).\n• Photosynthesizers: Some protists like Euglena\n(Fig. 23.3) have chlorophyll and manufacture\ntheir own food like the plants.\n• Reproduction: Mostly asexual reproduction by\nfission and some reproduce sexually.\n• Occurrence: Many protists live freely in water\nor in soil and many are harmful parasites which\ncause diseases. Some of the protists are\npathogenic, such as Entamoeba histolytica that\ncauses dysentery and Plasmodium vivax that\ncauses malaria.
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The oceans are divided into two main zones: the pelagic and the benthic zones. The pelagic, the uppermost zone, is further divided into the euphotic or sunlit zone up to 660 feet, the dysphotic or twilight zone up to 3,300 feet, and the aphotic or midnight zone up to 20,000 feet.
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Your question is vague and / or incomplete.Still I will do my best to answer it.\n Planktons = Planktons are microscopic aquatic organisms that float and drift on the water surface. Mostly are single celled but need not be always.The size matters and it has to be microscopic.\nThese planktons are of two main types i) Phytoplanktons and ii) Zooplanktons.\ni)Phytoplanktons-: Basically these are planktons as mentioned above as they fit in to that category.In addition, they have chloroplasts with chlorophyll. So they can prepare their own food like all plants that we know.Therefore the prefix PHYTO- is put before them to indicate their plant like character and affinity with the Plant Kingdom.\nMany unicellular algae come in this group.They are found in the seas as well as fresh water.Diatoms Volvox Chlamydomonas Eudorina Pandorina are but a few examples.\nii) Zooplanktons-:Basically these are planktons as mentioned above as they fit in to that category.But they do not have  chloroplsts like the first one and hence they cannot prepare their own food.Thus they are more animal like in their nutrition and hence the prefix ZOO- is put before them to indicate their animal like character and affinity towards the Animal Kingdom.These are also found in sea and fresh water.Many protozoa and larvae of aquatic animals come in the category.\nHuge animal like Baleen Whale largy depend upon this planktonic flora and fauna for their subsistance.\n Now in the light of the above information kindly rephrase your question. Your personal information will have no bearing on the answer so you need not give it.
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u must be knowing that all organisms are classified into five kingdoms-monera,protista,anemalia,fungi and alge.\n\nthe MONERA phlum[group] consists of bacteria which are prokaryotic in nature -i.e, the cell doesnot have membrane bound organneles or nucleus.\n\nthe Protista group consists of organisms that are eukaryotic in nature-that is they have well defined organneles.\nthis is one reason that bacteria is kept in two separate groups.
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Rotifers   are the only I can think of  now if it were Phylum Mollusca it could be Snails, Clams, and squids\n                                 good luck
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Let me (or wikipedia) tell you about protists.\n\nProtists were traditionally (for the last 150 years) subdivided into several groups based on similarities to the higher kingdoms: the animal-like protozoa, the plant-like algae, and the fungus-like slime molds and water molds. These groups often overlap, and have been replaced by phylogenetic classifications. However, they are still useful as informal groups for describing the morphology and ecology of protists.\n\n\nI don't think scientists have done much for them.
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First you need to know what phyla of invertebrates you will include. Then, get at least a picture that represents each one, and start by separating them into large categories using a visible feature. Then separate each of the major groups into smaller ones. \nRepeat this, and write down each step of this process. Then order your notes and add numbers to go from one alternative to the next... voilà the dichotomous key.\n\n\n\nAlternatively, if you want a ready-made one, try these resources:\nhttp://www.msc.ucla.edu/oceanglobe/pdf/Invertebrates/Inverts_Key_Phyla.pdf\nhttp://www.bio.davidson.edu/courses/invertzool/lab/ex1taxonomy.pdf\n\nIf you do it yourself it's more fun :-)
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You should find the answer you seek here...\nhttp://www.biology.lsa.umich.edu/~gwk/teaching/limno/lab/onlinemanual/chlorophyll.html\nhere...\nhttp://www.steve.gb.com/science/natural_selection.html\nhere...\nhttp://plankt.oxfordjournals.org/cgi/content/abstract/24/11/1221\nor here...\nhttp://en.wikipedia.org/wiki/Phaeophytin
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Actually, sponges are mostly colonial. They belong to Pylum Porifera and are almost exclusively marine.  Many smaller individuals group together and partner to form the structures you see and function as a unit. There are species which are solitary. Solitary sponges and colonies range in diameter from about 1/2 in. to 5 ft (1–150 cm) and vary greatly in shape. Some are branched, some more or less globular, and some are thin encrustations on rocks and pilings.\nPoriferans  are one of the simplest multi-cellular animals. 98% of this phylum consists of marine species. They have a cellular level of organization, without any organs or tissues. Sponges consist of several different cell types, each specialized for a different purpose and all working independently of one another. Canals run throughout the body of the sponge, cycling through water for feeding, gamete dispersal, waste disposal, and gas exchange. Colonial sponges often have many small ostia (inflow; sing. ostium) and share one large osculum (outflow; pl. oscula). Structure is present in the form of calcium carbonate or silica spicules embedded in a gelatinous mesohyl layer. Also embedded in the mesohyl are unspecialized cells called archaeocytes. Archaeocytes perform various functions, including: intracellular digestion, gamete production, and waste elimination. Sponges also have the amazing ability to self-recognize and reform if broken apart; archaeocytes are thought to function in this as well. Flagellated cells, called choanocytes or collar cells, create water flow as well as capture small food particles and incoming sperm. Sponges are divided into three classes, distinguished by differences in structure: Demospongiae (like your common bath sponge), Calcarea, and Hexactinallida. They are also divided into functional groups based on form complexity.\n\nSo the answer is really BOTH.
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I am not an expert, but I am on my local watershed watch team. We conduct water samples and look for species diversity in the water. Factors that affect diversity in water is the clarity, amount of sedimentation/other pollutants, temperature, stream bottom material (sand, mud, rock, etc.),sinuosity, percentage of dissolved oxygen, turbidity, and vegetation surrounding the stream banks. Also I would think diversity depends on the location of the river. There will obviously be differences in a river that runs near Chicago and a river that runs through the Adirondak Mountains. I am sure I have left many things out, but hopefully i've said a few things you could do a search on.