The Effect Of Bacteria And Viruses On The Migration Of Monarch Butterflies

1713 Words Jan 8th, 2016 7 Pages
6. Why has a decline in the milkweed population, as a result of urbanization and pesticides, affected the migration of monarch butterflies?
Fewer monarch butterflies are crossing North America to winter in Mexico, and the biggest culprit seems to be the disappearance of milkweed in the United States. The trend is particularly troubling because monarchs have long been considered both an indicator of our ecological health and a representative of pollinator populations. Milkweed is the only plant on which monarch butterflies will lay their eggs, and it is the primary food source for monarch caterpillars. Despite its necessity to the species, the plant decreased 21 percent in the United States between 1995 and 2013.
7. How has the introduction of bacteria and viruses in inland lakes affected the life cycle of carp? The introductions of bacteria and viruses in inland lakes have affected many stages of the carp life cycle. The affected stages are mainly reproductive and growth stages. Bacteria and viruses have affected the reproduction rate of carp. This decreases the genetic diversity of the overall carp population. With decreased genetic diversity, the population has not be able to survive in areas where the viruses and bacteria are present. Therefore, large amounts of carp have died off. The introduction of bacteria and viruses in inland lakes has also increased infant mortality rates, this has further damage the population and also decreases the chance of survival of…

Related Documents