Bar-tailed Godwit (Limosa lapponica) Science Article 1
Estimating diet composition of Bar-tailed Godwits Limosa lapponica by visual observations was hampered by large amounts of unidentified prey items. Therefore, additional analyses of faeces were conducted. Overall, 17 prey species were found in the droppings, but only four polychaetes, the Lugworm Arenicola marina, the Estuary Ragworm Nereis diversicolor, the Catworm Nephtys hombergii, Scoloplos armiger and one crustacean, the Shore Crab Carcinus maenas were taken regularly by the birds. In faecal samples the number of polychaete chaetae, hooks, jaws and bivalve umbos were estimated, which allowed in the case of Nereis diversicolor, Nephtys hombergii, Scoloplos armiger and the Baltic Tellin Macoma balthica an estimation of the minimum number of prey individuals per dropping. The ratios of these prey species to each other in the faeces were used to correct for the unidentified prey taken during observations. The diet of Bar-tailed Godwits showed a seasonal pattern, as well as differences between males and females.
Scheiffarth G., ARDEA 89 (3): 481-494.