Hi all I apologize in advance if this is not the right place for my questions. I am looking at a forest succesion based on a long term monitoring program. The area consists of 350 ha of heath divided in 33 quadrats. Among other things I am interested in determining succession pathways, rates and trajectories (convergence, divergence, etc). For that I will calculate simmilarities/distances between the different quadrats and determine temporal and spatial effects. However there are several problems I need to overcome: 1. Different sample size. Quadrats differ in area and samling intensity has changed over the years (first 8 suveys were complete census, while last two were sampling plots within each quadrat). Does it make sense to extrapolate the smaller sample areas and then standardize so that maximum abundance = 1 ? 2. Is it valid to extract the distances/simmilarities between two consecutive years obtained either directly or from an ordination space and then use this in a regression type analysis to determine if there is a trend (community becoming more stable). 3. Different time intervals. Given that the intervals between surveys differ (min = 5 years, max = 21) and if the above is valid is it possible to transfrom this distance measure into something like distance per year instead? thanks for your help Sebastian Kepfer -- View this message in context: http://r-sig-ecology.471788.n2.nabble.com/community-similarities-in-time-tp7577448.html Sent from the r-sig-ecology mailing list archive at Nabble.com.
community similarities in time
1 message · sebastiankr