High Quality Content by WIKIPEDIA articles! The Janzen–Connell hypothesis is a widely accepted explanation for the maintenance of tree species biodiversity in tropical rainforests. It was published independently in the early 1970s by Daniel Janzen and Joseph Connell. According to their hypothesis, there is a density- or distance-dependent factor in recruitment of seedlings from adults of tropical tree species due to host-specific predators or pathogens. These predators/pathogens that specifically target a species make the areas directly surrounding that parent tree (the seed producing tree) inhospitable for the survival of seedlings. In other words, the hypothesis states that specialist predators, pests, and pathogens keep key plant species rare enough to reduce their competitive ability enough so as to make space available for many other species. A tree predator is an herbivore of some kind, often tropical insects, that consume parts of the tree for food. An example of a tree...

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