| Titre : | Disturbance as an important factor in the decline of Black Terns Chlidonias niger in The Netherlands |
| Auteurs : | Jan van der Winden, Auteur |
| Type de document : | Article |
| Dans : | Vogelwelt (Die) (123(1) 2002) |
| Article en page(s) : | 33-40 |
| Résumé : | Black Terns declined considerably in The Netherlands this century, which is attributed to habitat loss, deterioration of nesting sites, insufficient feeding conditions, disturbance and predation. So far, only for the first three factors evidence is available that these can be limiting on a population level in The Netherlands. Studies on breeding success were conducted in order to find out if disturbance could contribute to a low production. In all colonies studied, clutches were hardly abandoned during the incubation stage, suggesting that disturbance is of minor importance in this period. However, in 55 % of all colonies the young left the nest permanently before they could fly. The breeding success in these colonies was significantly lower (0.36 young per pair) than in colonies where chicks remained on the nest until they could fly (1.10 young per pair). Pairs that were still able to produce young in situations where they had to leave the nests were less successful (1.0 young per pair) than successful pairs that could raise young on their nest (1.6 young per pair). These differences in breeding success were not caused by differences in food availability or colony location. The increased human pressure on agricultural areas and reserves likely contributed to the decline of breeding success in The Netherlands and possibly elsewhere in Europe. The question is whether this indirect effect of disturbance on breeding success might as well play a role in other bird species in areas with many human activities. |
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