The diagram shows relationships among midge larvae(Chaoborus nyblaci), larval salamander(Ambystoma tigrinum) and two species of crustacean Daphnia(D. rosea and larger D. pulex) that inhabit certain pond communities. Study relationships and deduce which of following is/are correct.

According to the image, presence of high numbers of larval salamander will inhibit the Daphnia pulex production. This will show positive effect on D. rosea because D. pulex has negative effect on it. When larval salamanders are present, predation reduces the population growth rate of the larger Daphnia, D. pulex. This will facilitate the the coexistence of the Daphnia rosea. The two species of Daphnia compete for the same resources and hence increase in resource availability will increase the number of midge larvae and larval salamander as both species of Daphnia have positive effect. Increase in the number of D. pulex would lead to a decrease in the number of D. rosea. This in turn will reduce the number of midge larvae.