Genus: Strandsnegler (Littorina)
| Year | Arter/grupper | Localities | Participants | Observations |
|---|---|---|---|---|
| 2024 | 1 | 2 | 2 | 3 |
| 2023 | 1 | 3 | 3 | 15 |
| 2022 | 2 | 5 | 5 | 23 |
| 2021 | 1 | 10 | 8 | 35 |
| 2020 | 2 | 14 | 11 | 79 |
| 2019 | 1 | 20 | 15 | 84 |
| 2018 | 3 | 14 | 12 | 87 |
| 2017 | 3 | 16 | 12 | 75 |
| 2016 | 3 | 19 | 18 | 99 |
| 2015 | 4 | 15 | 12 | 79 |
| 2014 | 4 | 22 | 14 | 46 |
| 2013 | 4 | 13 | 11 | 33 |
| 2012 | 2 | 4 | 4 | 21 |
| 2011 | 1 | 3 | 3 | 7 |
| 2010 | 3 | 6 | 4 | 11 |
| 2009 | 2 | 4 | 4 | 15 |
| 2008 | 2 | 5 | 4 | 18 |
| 2007 | 4 | 8 | 7 | 17 |
| 2006 | 3 | 6 | 5 | 27 |
| 2005 | 1 | 8 | 7 | 48 |
| 2004 | 4 | 15 | 10 | 57 |
| 2003 | 4 | 9 | 8 | 80 |
| 2002 | 4 | 12 | 12 | 59 |
| 2001 | 3 | 18 | 16 | 92 |
| 2000 | 3 | 24 | 23 | 126 |
| 1999 | 2 | 29 | 26 | 203 |
| 1998 | 2 | 59 | 57 | 439 |
| 1997 | 3 | 96 | 89 | 828 |
| 1996 | 2 | 172 | 165 | 1450 |
| 1995 | 2 | 200 | 183 | 1753 |
| 1994 | 2 | 257 | 245 | 2302 |
| 1993 | 1 | 280 | 261 | 2562 |
| Totalt alle år | 4 | 536 | 455 | 10773 |
