The lapwing have been nesting across the marsh, as have a number of other ground nesting species such as redshank, skylark and meadow pipits. They are very vulnerable at this time of year and so we do a few things to help give them a helping hand.
I’ve had a few questions recently about some of the things that we have done so I thought a blog post may help answer some of these questions. The main one that has come across is to do with the spikes that we have put on many of the fence posts around the main marsh. These are to deter avian predators such as crows, buzzards and magpies from perching all day and scanning the site for vulnerable eggs or chicks.
There has been some very nice studies produced that show the effect of vantage points on nesting success in ground nesting birds such as lapwing. One study saw that lapwing would not nest within, on average, 50 metres of a potential perching point. Therefore to maximise the number of territories within a site you have to deter birds from perching on all the very convenient posts that we have placed for them with our fencing.
We have had to look at natural vantage positions as well. Hedgerows with standards and high points act in the same way, allowing predators to comfortably sit and observe. This in mind, we dropped the height on many of the hedgerows in strategic places around the main marsh. This will be a staged approach where we will do some each year so that there is still plenty of nesting opportunities for species like sedge warbler and whitethroats but within a few years we will have all the hedges at a manageable height. Most of the work that we have done, the hedges are still bulky enough to have birds nesting in any way.
The next step is with the cattle. I have put in 36 cows into the main marsh. This is a fine balance between having too many and increasing the chance of squashing a nest and having too few and the grass be too long for the chicks to feed. Lapwing chicks need areas of short vegetation to feed on, gleaning invertebrates off the surface.
It’s an important balance that needs to be struck. Do you dissuade all predators across the site? Do you leave a natural level? What is a natural level? What you have to bear in mind is that when natural levels of predators existed there was a much more natural coastline where sites shifted and changed each year with coastal erosion and drift. This means that there were many more places for these bird species to nest. Now there are very few and Farlington Marshes nature reserve represents an important site in the area. A bad year here has significant effects on numbers in the area.