<descriptor thcode="62"><thesaurus thcode="62" name="Coastal and Marine Ecological Classification Standard" scope="Categories of ecosystems for coastal, estuarine, and marine environments." creator="FGDC" rights="public domain" date="2017-05-10" codetype="alpha" prefix="cmecs" uri="https://www2.usgs.gov/science/CMECS" tblname="cmecs" root_code="root" contact="pschweitzer"><category><term thcode="25" code="16" name="hierarchical" parent="11" scope="Substantive broader-narrower relationships exist among the terms."/><term thcode="25" code="16" name="hierarchical" parent="11" scope="Substantive broader-narrower relationships exist among the terms."/></category><altlabel><altlabel>CMECS</altlabel><altlabel>CMECS</altlabel><altlabel>Coastal and Marine Ecological Classification Standard (CMECS)</altlabel><altlabel>Coastal and Marine Ecological Classification Standard (CMECS)</altlabel></altlabel></thesaurus><term thcode="62" code="BC-414" name="Cyanophyte Phytoplankton" parent="BC-387" scope="Biotic Subclass: Areas dominated by cyanophytes, blue-green algae that are photosynthetic bacteria. Some of these are nitrogen fixing, some form resting cysts, and they can exist singly or in colonies."/><bt><term thcode="62" code="BC-387" name="Phytoplankton" parent="BC-384" scope="Biotic Class: This class includes areas of floating or suspended microscopic algae that are capable of photosynthesis. ..."/><term thcode="62" code="BC-384" name="Planktonic Biota" parent="BC-C002" scope="Biotic Setting: Planktonic Biota includes biota that drift, float, or remain suspended in the water column in aggregations that are big enough to be (a) detected by the human eye (or with mild magnification) or (b) sampled with a fine-plankton net. ..."/><term thcode="62" code="BC-C002" name="Biotic" parent="root"/><term thcode="62" code="root" name="CMECS" scope="Coastal and Marine Ecological Classification Standard: Category terms encompassing waters from the head of tide or inland incursion of ocean salinity to the splash zone of the coasts to the deepest portions of the oceans and the deep waters of the Great Lakes."/></bt><nt><term thcode="62" code="BC-480" name="Cyanophyte Aggregation" parent="BC-414" scope="Biotic Group: Waters dominated by cyanophytes, which can aggregate under appropriate conditions in both coastal and open ocean environments. ..."/><term thcode="62" code="BC-481" name="Cyanophyte Bloom" parent="BC-414" scope="Biotic Group: Surface waters where rapid growth and very high densities of cyanophytes occur. Cyanophyte Blooms are increasingly common in coastal waters, and can be toxic."/><term thcode="62" code="BC-482" name="Cyanophyte Maximum Layer" parent="BC-414" scope="Biotic Group: Relatively thin layer dominated by cyanophytes at depth in the water column. ..."/></nt></descriptor>