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Amrhein, V. & D. Zwygart

Bestand und Verpaarungsstatus von Nachtigallen Luscinia megarhynchos im elsässischen Rheintal bei Basel.

2004

101

19–24

Key words
(von 1994 bis 2006 vergeben)

population size, mating status, bird census, Upper Rhine Valley

Bestand, Population, Verpaarung, Gesangsaktivität, Geschlechterverhältnis, Bestandesaufnahme

Schlagwort_Vogelart
(wissenschaftlich)

Luscinia megarhynchos

Schlagwort_Vogelart
(deutsch)

Nachtigall

Elsass, Frankreich, Petite Camargue Alsacienne, Basel

deutsch

Abhandlung

Population size and mating status of Rufous Nightingales Luscinia megarhynchos in the Upper Rhine Valley near Basel. – In 2003, we censused singing Rufous Nightingales in a study area of 17.9 km 2 between Saint-Louis and Kembs-Loechlé (France). Three surveys were made during the day and one at night. We counted 194 singing males, 83 of which were heard only during the day, 38 only at night, and 73 both at day and night. Since male Nightingales usually stop singing at night after pairing, we suggest that the 111 nocturnal singers were mostly unpaired males, while the minimum number of paired males would be 83. However, Nightingales were less easily heard during the day than at night. Based on the results from an intensively examined part of the study area (the Petite Camargue Alsacienne), we assume that the actual number of paired males was higher than 83 and that the population size was up to 240 males, about half of them being unpaired. We suggest that the high proportion of unpaired males reflects a strongly male-biased adult sex ratio and discuss implications for sexual selection and the interpretation of bird census data.