Population Viability Analysis: Count-Based and Structured Methods, Study notes of Conservation biology

Download Population Viability Analysis: Count-Based and Structured Methods and more Study notes Conservation biology in PDF only on Docsity! Review questions BSC3052 Population viability analysis Count based PVA 1. Explain the the main formula that we used on class to describe population growth and shrinkage! 2. Produce a graph with 3 example ”population growth curves”: (1) shrinking, (2) constant, (3) growning, label everything on the graph. 3. Calculate the growth rate from this data: Records of (ficticious) sightings of Elaphe guttata in Southwood in year 2000 to 2006: 44, 43, 42, 40, 39, 39 • Show a graph with time on the x axis and the growth rate λ on the y axis. Calculate λ for the years 2001 up to 2006. • Calculate the average growth rate over all years and its standard deviation. • Make a prognosis about the population size in year 2007 and 2008. Discuss the fate of this population based on the growth rate and the standard deviation of the growth rate estimate. 4. describe and discuss the assumptions of count-based PVAs. Structured PVA 1. Explain the the main formula (!) for a stage structured PVA. 2. The (ficticious) sightings of Elaphe guttata in Southwood was used to calculate transition rates from Juveniles to adults (0.255), Staying with the adult class (0.45), having 2 eggs per adult per year. • Sketch a stage graph, label all parts and fill in the transition rates. Assume that the transition rates are correct and that the snakes mature within a year. • Show the projection matrix, • calculate the number of juveniles and adults in year 2001 when we use the values of 2000 where we found 30 juveniles and 14 adults. • What is the growth rate between year 2000 and 2001, compare this with the count-based method above. • Show a graph with time on the x axis and the growth rate λ on the y axis. Calculate λ for the years 2001 up to 2006 using the start condition (30 juveniles, 14 adults) • How would you calculate the stable growth rate? Does your graph give a hint what the stable growth rate could be? • make prognosis about the population size in year 2007 and 2008. 3. describe and discuss the assumptions of the structured PVA. Page: 1