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. 2013 Feb 1;9:3. doi: 10.1186/2046-9063-9-3

Table 1.

Number of survey days shown as a function of both season and photo-identification survey periods

Season
Photo-Identification Survey Periods
  Survey Period 2006 Survey Period 2009 – 2010
Spring
1
4
Summer
2
5
Autumn
3
6
Winter 4 8