A pole, extendable from 2 to 8 m, with a nylon-mesh collecting net, was used to retrieve eggs from nests of Great Blue Herons (Ardea herodias) in the canopy of floodplain forests. A total of 200 eggs was collected for contaminant analysis from ten colonies along the upper Mississippi River during the spring of 1993. Low egg breakage (1%) and acceptable survival of embryos in an incubator to pipping (55%) indicated that the device was useful.
|Title||Evaluation of an extendable pole-net to collect heron eggs in the canopy of tall trees|
|Authors||R. K. Hines, T. W. Custer|
|Publication Subtype||Journal Article|
|Series Title||Colonial Waterbirds|
|Record Source||USGS Publications Warehouse|
|USGS Organization||Upper Midwest Environmental Sciences Center|