History
Propagule pressure plays an important role in species invasions (Groom, 2006). Charles Darwin was the first to study specific factors related to invasions of non-native species. In his research he identified that few members of the same genus were present in habitats containing naturalized non-indigenous species (Colautti et al., 2006). His research showed that the number of nonnative species varied from habitat to habitat. Later, it was suggested that the niche theory and biotic resistance help explain the variation in success or failure of nonnative invasion (Colautti et al., 2006). More recent studies have shown that particular invasive species characteristics, such as ability to compete for resources, aid in their proliferation in habitats. A study noted by Colautti showed the correlation between propagule pressure and invasion success (2006). Without propagule pressure the number of invasive species incorporated would be unpredictable. It has been shown that species successfulness is frequently attributed to propagules (Colautti et al., 2006).
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