In theory the ultimate productivity of the system is determined by the amount of energy input from the sun and is usually limited by the availability in organic nutrients (phosphates and nitrates) to the primary producers (phytoplankton) which form the base of the food chain.
(the ultimate productivity of the system; is determined; by the amount of energy input from the sun; L:In theory) (the ultimate productivity of the system; is limited; by the availability in organic nutrients; to the primary producers; T:usually) (the primary producers; form; the base of the food chain)
the ultimate productivity of the system the ultimate productivity of the system the primary producers
is determined is limited form
by the amount of energy input from the sun L:In theory
by the availability in organic nutrients to the primary producers T:usually
the base of the food chain