It seems that the smaller the size of an organism, the greater number of it in the environment. For example, bacteria is tiny, but the number of it is huge. Virus is even smaller, but its number is bigger in the environment. Under what condition it is true? What is the mechanism?
I think, the following link will answer your questions:
http://lab.rockefeller.edu/cohenje/PDFs/320JonssonCohenCarpenterAdvEcolRes2005.pdf
i had no idea but , generally plants differ than Micro organisms in their method of reproduction and feed back number.
”It seems that the smaller the size of an organism, the greater number of it in the environment.”
It would have been really strange if in the same space could be present as many elephants as many viruses or bacteria...
A basal species is a species recorded as eating no other species. Usually a basal species is autotrophic, but the absence of evidence that a given species consumes any other species may be due to incomplete observation (for example, of endosymbionts). A top species is a species recorded as having no other species as predators or consumers. The absence of evidence that a given species is eaten by any other species may be due to incomplete observation (for example, of parasites inside individuals of the species). An intermediate species is a species that consumes at least one other species and is consumed by at least one other species in the web. An isolated species is a species that has no other species reported as predators or prey. And In a food chain basal species, a top species that eat each species is eaten by the next species in the list. The trophic position of a species in a food chain is the number of species preceding it in the ordered list of species in the chain. For example, in the food chain species “A” has trophic position “1”, species “B” has trophic position “2”, species “C” has trophic position “3”, and the trophic position of” Z” is equal to the number of species in the list. Trophic height is the average trophic position of a species in all food chains of which it is a part. Probably because of large size, a few phytoplankton species may not be eaten by the herbivores. In All food chains were interdependent on each other but no chain is independent if vegetation is less and there are more herbivores that depend on the vegetation there will be no vegetation and if carnivores are more in number there won’t be herbivores. If both are not there Omnivore can’t be there too. So to balance these organisms in an ecosystem as we go from lower to to the higher trophic levels there will be decrease in number!
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