Algae is a so-called primary producer, meaning it is foundation for the entire food chain.
藻类是所谓的初级生产者，这意味着它是整个食物链的基础。
Primary producer
原声例句
PBS访谈环境系列
PBS地球-动物趣闻
As plants are primary producers that make their food from sunlight, they form the lowest level and have the greatest biomass.
由于植物是利用阳光制造食物的初级生产者，因此它们形成最低层并具有最大的生物量。
英语百科
Primary producers
（重定向自Primary producer）
Primary producers are organisms in an ecosystem that produce biomass from inorganic compounds (autotrophs). In almost all cases these are photosynthetically active organisms (plants, cyanobacteria and a number of other unicellular organisms; see article on photosynthesis). However, there are examples of archaea and bacteria (unicellular organisms) that produce biomass from the oxidation of inorganic chemical compounds (chemoautotrophs) in hydrothermal vents in the deep ocean.
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