"Reductions in habitat patch sizes and increases in patch isolation are often associated with increased nest predation and reduced bird populations (e.g.
Berg, A., Nilsson, S.G. and Boström, U. (1992) Predation on artificial wader nests on large and small bogs along a south–north ... R.O. (1991) Populations and nesting success of upland-nesting ducks in relation to cover establishment.
Significantly higher nesting success was found for ducks using undisturbed grass-legume cover on retired fields compared to ... For optimum habitat, established cover should remain completely undisturbed for 5 to 10 years (Duebbert and ...