In many freshwater ecosystems, the availability of inorganic nitrogen compounds is a limiting factor for growth. This means that producers cannot grow as quickly as they could even though no other factor is limiting.
Which statements about these ecosystems are correct?
1) Transfer of energy to higher trophic levels is also limited by availability of these nitrogen compounds.
2) Addition of excess nitrate compounds will benefit all organisms in the ecosystem.
3) The percentage of energy lost between trophic levels will be the same whether nitrogen compounds are limiting or not.
4) Addition of ammonium compounds will cause an increase in the numbers of nitrifying bacteria.
1, 3 and 4 only
2 )
1 and 3 only
3 )
2, 3 and 4 only
4 )
2 and 4 only
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