Reproductive Effects of Nest-Marking Studies in an American White Pelican Colony

Nutrient Utilization and Diet Preference of American White Pelicans Consuming Either a Mono- or Multi-Species Diet

“…Increased regurgitation and agitation of pelicans has been attributed to the presence of humans (Johnson and Sloan 1976;Boellstorff et al 1988;Johnsgard 1993). The resulting increased distress may have decreased feed intake compared to wild (unconfined) pelicans (Uramoto 1961;Kale 1965;Willson and Harmenson 1973).…”

Reduced breeding success of Cormorants (Phalacrocorax carbo sinensis) in relation to persistent organochlorine pollution of aquatic habitats in The Netherlands

“…Neither were there signs of large scale interference by human activity like destruction of nests or egg collection. Several authors (Anderson & Keith, 1980;Fetterolf, 1983;Anderson, 1988;Boellstorff et al, 1988) have shown that research may cause serious effects on the breeding results of birds. During our research the frequency and duration of the visits were comparable in all colonies.…”

The Influence of Synchronous Breeding, Natal Tree Position and Rainfall on Egret Nesting Success

“…A larger problem may arise because various studies used different methodologies to monitor nests. Also, in some cases, fledging success was determined after nest and egg marking; this may have a detrimental effect on survivorship of young (Boellestorff et al 1988). …”