Hi
Am analysing a freshwater turtle tracking study data. The turtles were caught in fyke nets in a flowing river. There are 4 sites that are 40 km apart. There have been recaptures at the upper 3 sites, but not the lower sites as this site has both lower numbers and a low abundance of females caught in the nets.
The PENT values for the two upper sites are similar (~0.035), however the PENT for the 2nd lowest site is estimated to be (0.88*10^-15) regardless of model. The river at the lower two sites is much broader, with longer reaches that are spatially larger and therefore a larger area for the nets to try and capture individuals over. Is this potentially what is happening? Just a much lower probability of entry to the population caused by reduced probability of individuals intercepting the net compared to the more spatially restricted upper to sites?