Biological Invasions And Its Effects Essay

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Biological invasions have been occurring since the dawn of time. Some more recent have occurred since the last glacier period. A biological invasion can be defined as the spread and settlement of an individual of a specific species. Although, we also tend to think of invasions as having a negative impact or potentially negative impact, this is not always the case. Without these biological invasions most species wouldn’t be able to survive. The primary reason for this is that it is natural for a species to disperse from its location due to the selection processes that they are initially forced into. It cannot be said that all invasions are good, but rather, that each invasion will have both positive and negative effects. One of the more recent biological invasions which took place within the northern United States was due to the Rusty Crayfish, Orconetes rusticus. Wilson et al (2004) described the movements of Orconetes rusticus, and their significant effects and influence on the surrounding biological populations. The most compelling thing they had to say was the fact that this breed of crayfish out-competed almost every other competitor and prey. One could also argue that diseases can act as a biological invasion. That is, if a disease is found in one area and suddenly becomes endemic in a new area, this would mean that the disease has followed the pattern and definition of a biological invasion, and can be considered an invasive disease. One of the more recent biological
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