Tropical ecosystems are known for their high species richness. This creates a problem for those who are sampling biodiversity. No matter how much effort one makes in collecting data, more species are always entering into the sample ( Hub bell, 2001), making it virtually impossible to collect all species at a given site (totayl alfa biodiversity). For this reason, it is necessary for field biologists to recognize the limitations of their sampling methods and to evaluate the reasonable amount of time and work needed before they cease sampling.