Over the last fifty years, a range of methods have been used to estimate the annual survival rates of waders/shorebirds. These estimates are based on many hours of patient catching and colour-ring reading, making each one too valuable to discard. How can estimates generated in different ways be combined and what can these estimates tell us about the way in which survival rates vary between species and in different parts of the world?
Survival rates are important
As revealed in this previous WaderTales blog, Waders are Long-lived Birds, larger species survive for 30 years or more and even smaller species, such as Ringed Plover (right), manage 20 years. With relatively low annual breeding productivity, maintaining a high survival probability of typically between 70% and 90% per annum is essential for population stability. If the annual survival figure for adults drops, as discussed in this blog, Wader declines in the shrinking…
View original post 913 more words