Year, month | Ind./m2 | % | n | Data referring to |
---|---|---|---|---|
1987, January | 44.9 ± 43.0 | 0.3 | 4 | Weikert and Trinkaus 1990 |
1993, June | 107.7 ± 102.9 | 0.2 | 7 | Weikert et al. 2001 |
1998, January | 48.1 ± 29.1 | 0.4 | 3 | Weikert, unpublished |
1999, April | 53.1 ± 16.2 | 0.3 | 4 | Koppelmann and Weikert 2007 |
2001, October/Novembera | 66.4 ± 40.2 | 0.4 | 2 | Koppelmann and Weikert 2007 |