number of juveniles. This indicates that there is high recruitment, which results in a growing population. More offspring equals more candidates that may be able to establish a supporting location and survive through adulthood and reproduce, figure five and seven are examples of increasing species. Their juveniles are high, therefore indicating a growth in its population.To determine if a species is declining there must be a high number of adults and low juveniles. This shows that there is minimal recruitment and the species is not reproducing fast enough to maintain its current population. Figures eight and nine are good examples of declining populations. Both of these species have no juveniles present, which indicates that the adults are not reproducing. If no offspring are produced before these individuals present die, the species will fall into local extinction.To determine if a species is remaining approximately the same there must be low juveniles and adults, with high middle-aged trees. This is because if there are low juveniles then not many individuals are being added into the population and if there is a high number of middle aged trees then that suggests that most juveniles are able to establish themselves and survive. The low number of adults indicates that not a lot of middle aged trees survive to adulthood. An example of a species population that is remaining approximately the same is presented in figure six, where juveniles and adults are low and middle aged trees are high.4.b.Refer to “A Guide to the Common trees of the College Woods Natural Area”The present size structure of the species in College Woods suggests that there was a disturbance probably about 50 years ago and now the forest is reestablishing itself. The main observation supporting this is that the size of the DBH’s are quite small in comparison to what they would be if there had been no disturbance. The forest has now reestablished its se...
