plant
Several biotic factors can affect the primary production of a plant, may it be an antagonistic action that would stress out the plant and decrease its primary production or on the contrary a positive interaction that would increase it.
Explanation:
The primary production of plants (a.k.a it's the production of biomass through growth) may be altered or boosted true a wide range of biotic factors ( a.k.a interaction with another living being).
Some good example of decreasing factor could be parasitism. Indeed, insects like several true bugs ( order: Hemiptera) feed on plants. This negative interaction could stress the plant and slow down the plant's growth.
Herbivory in some context could be a diminishing factor of growth. Lamarre et al.in 2012 show that in a poor environment where growth isn't easy to achieve, a high herbivory rate would favor a strategy of defenses instead of a strategy of high growth that would compensate herbivory.
Herbivory in some context could be a diminishing factor of growth. Lamarre et al.in 2012 show that in a poor environment where growth isn't easy to achieve, a high herbivory rate would favor a strategy of defenses instead of a strategy of high growth that would compensate herbivory.
On the other hand, positive interaction could help plant's growth. For instance the mycorrhiza symbiosis between plant's roots and ground fungus. This association where the plant feeds the fungus and the fungus help the root system to be more effective. This biotic interaction can help the plant to find enough nutrient to increase its growth (Mosse 1973).
There are many more examples of a factor that could affect the primary production of plants, competition, commensalism and every other ecological interaction that could happen in a community and that can be seen as a biotic factor.
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