caa a22 4500 46317593X CHVBK 20180406164826.0 cr unu---uuuuu 170326e20071001xx s 000 0 eng 10.1007/s10336-007-0183-8 doi (NATIONALLICENCE)springer-10.1007/s10336-007-0183-8 Mute swan ( Cygnus olor ) winter distribution and numerical trends over a 16-year period (1987/1988-2002/2003) in France [Elektronische Daten] [Carol Fouque, Matthieu Guillemain, Maurice Benmergui, Gilles Delacour, Jean-Yves Mondain-Monval, Vincent Schricke] The numbers of mute swans (Cygnus olor) at 98 wetland locations in France were monitored monthly during the winter (December-February) for 16 years by a national network of observers as part of a broader national wildfowl monitoring scheme. Log-linear Poisson regressions with TRIM software were used to estimate missing counts and produce national numbers and indices. These corrected indices were in turn used to calculate an average annual rate of change and the associated confidence interval that subsequently enabled the computation of a cumulated (global) rate of change and associated confidence interval. The latter were interpreted to classify the numerical trends over the whole period. For the six wetlands with the largest numbers of mute swans, average numbers of swans were also compared between wetlands and months. General Linear Models were then used to test simultaneously for (1) differences between years and between wetlands for each month and (2) between years and between months separately for each of the six wetlands. The mute swan average annual rate of change was >7% for each month. The global rate of variation corresponded to a "strong increase” after TRIM analyses. This result strongly supports the necessity of maintaining both national and international monitoring schemes in order to be able to quickly detect major increases in swan numbers at specific sites, particularly where increasing numbers may result in a conflict with farmers or in inter-specific competition with other waterbirds and/or represent a possible sanitary/public health hazard due to the potential for swans to carry avian influenza viruses. Dt. Ornithologen-Gesellschaft e.V., 2007 Cygnus olor nationallicence France nationallicence Mute swan nationallicence Trends nationallicence Winter distribution nationallicence Fouque Carol Office National de la Chasse et de la Faune Sauvage, CNERA Avifaune Migratrice, Station de la Dombes, 01330, Birieux, France aut Guillemain Matthieu Office National de la Chasse et de la Faune Sauvage, CNERA Avifaune Migratrice, La Tour du Valat, Le Sambuc, 13200, Arles, France aut Benmergui Maurice Office National de la Chasse et de la Faune Sauvage, CNERA Avifaune Migratrice, Station de la Dombes, 01330, Birieux, France aut Delacour Gilles Office National de la Chasse et de la Faune Sauvage, CNERA Avifaune Migratrice, Au bord du Rhin, Gerstheim, 67154, Erstein, France aut Mondain-Monval Jean-Yves Office National de la Chasse et de la Faune Sauvage, CNERA Avifaune Migratrice, La Tour du Valat, Le Sambuc, 13200, Arles, France aut Schricke Vincent Office National de la Chasse et de la Faune Sauvage, CNERA Avifaune Migratrice, 53 Rue Russeil, 44000, Nantes, France aut Journal of Ornithology Springer-Verlag 148/4(2007-10-01), 477-487 0021-8375 148:4<477 2007 148 10336 https://doi.org/10.1007/s10336-007-0183-8 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10336-007-0183-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Fouque Carol Office National de la Chasse et de la Faune Sauvage, CNERA Avifaune Migratrice, Station de la Dombes, 01330, Birieux, France aut NATIONALLICENCE 700 1- Guillemain Matthieu Office National de la Chasse et de la Faune Sauvage, CNERA Avifaune Migratrice, La Tour du Valat, Le Sambuc, 13200, Arles, France aut NATIONALLICENCE 700 1- Benmergui Maurice Office National de la Chasse et de la Faune Sauvage, CNERA Avifaune Migratrice, Station de la Dombes, 01330, Birieux, France aut NATIONALLICENCE 700 1- Delacour Gilles Office National de la Chasse et de la Faune Sauvage, CNERA Avifaune Migratrice, Au bord du Rhin, Gerstheim, 67154, Erstein, France aut NATIONALLICENCE 700 1- Mondain-Monval Jean-Yves Office National de la Chasse et de la Faune Sauvage, CNERA Avifaune Migratrice, La Tour du Valat, Le Sambuc, 13200, Arles, France aut NATIONALLICENCE 700 1- Schricke Vincent Office National de la Chasse et de la Faune Sauvage, CNERA Avifaune Migratrice, 53 Rue Russeil, 44000, Nantes, France aut NATIONALLICENCE 773 0- Journal of Ornithology Springer-Verlag 148/4(2007-10-01), 477-487 0021-8375 148:4<477 2007 148 10336 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer