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syntrophy
ing on its food; symbiotic bacteria, which live in the gut of, e.g., Echinoidea,
and produce essential amino-acids for the host by nitrogen fixation. Phoresis is
a form of symbiosis in which one species lives in the shelter of, or is transported by, another without food relationships.
symbiotic algae ~symbiosis.
sympatric speciation ~speciation (biol.).
syncytium mass of cytoplasm, enclosed in a single continuous plasma membrane, containing many nuclei. The cytoplasm can have different forms.
synecology ~ecology.
synergism by interaction the total effect of two agents exceeds the sum of the
effect of either single agent.
syngamy fusion of gametes in fertilization.
synoptic an approach in which a certain process or condition is studied or displayed simultaneously over a wide area.
syntrophy is a nutritional situation in which two or more organisms combine
their metabolic capabilities to catabolize a substance which neither can be
catabolized by one of them alone.