Number the Species/Distribution
There are around 20,000 living varieties of clams worldwide.
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There space 260 varieties native to phibìc American freshwaters.
There are around 6 non-native (introduced) types in phibìc America.
Most freshwater bivalves are filter feeders, eating tiny suspended particles, consisting of plankton, detritus, and bacteria.
Clams and also mussels take in water, including any kind of particles rely in the water, through a small tube called the inhalant siphon
Food corpuscle that are in the water are accumulated and sorted internally, and eventually inserted into its mouth (which is internal).
The water and any non-food particles are then released earlier into the atmosphere through a 2nd tube, called the exhalant siphon.
Clams and also mussels can be discovered in practically all species of freshwater habitats, but are very common in big rivers and also streams.
Most burrow right into the soft substrate to varying depths, when some teams live free on the sea floor.
There are likewise clams and also mussels the can attach themselves permanently to the substrate through using special anchoring threads dubbed byssal threads.
CLAM: exciting FACTS
When miscellaneous foreign, prefer a serial of sand or a tiny parasite, it s okay stuck in the tiny space in between a clam"s body and its shell, it can sometimes be absorbed into the external membrane of the clam (called the mantle). Once this happens, the international object is slowly covered in layers and layers that secretions produced by the mantle. Over time, this produce a pearl.
Clams can"t breath in an waiting environment. Once there is a drought, however, part clams can spend months, even years, the end of water. They carry out this by closing up and shutting down all processes other than for the necessary ones, and also they lug these the end without oxygen. The clam opens up slightly to obtain rid of any type of waste the builds up, yet it only does this when in a while come avoid shedding too much moisture.
If you take a dried-out seashells or mussel and also put it ago into the water, the will easily open up and start absorbing as lot water as it can in order to obtain lots of oxygen and also remove any waste. After 12 hours, it will be fully back come normal.
Bivalves are sort of choose trees. You can figure out their age by counting the variety of growth present on your shells, just like the ring of a tree trunk.
Reproduction is sexual, request both a male and also a female.Some types are hermaphrodites (which have both female and male reproductive systems).
Male clams create sperm and also release it into the water, while females create eggs the are kept internally.
The sperm get drawn into the mrs bivalve through her siphons, and fertilization occurs.
The larvae build inside the shell of the female, after i beg your pardon the young are released right into the environment where they deserve to settle along the bottom.
When two hermaphrodites mate, castle can pick who will take top top the masculine or woman role.
Role in Food Chain
Freshwater bivalves have a wide range of predators;
Numerous varieties of fish, such as catfish, carp, and sunfish and birds, crayfish, and frogs prey on clams.
A selection of mammals, such together otters, raccoons, and muskrats also eat clams.
Brusca, R. C, and Brusca, G. J., 2003. Invertebrates, 2nd ed. Sinauer Associates, Inc., Publishers, Massachusetts. Pages 712, 730.
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National organic Information framework (2010). Bivalvia.
Waterwatch south Australia, environmental Protection government (2006). Snails.
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