This graph contains all records of the species, whether entered by list or as occasional data. The data are aggregated by week and the last 10 years are cumulated. Null data and data under verification (red, blue or yellow mark) are not taken into account. Unlike the graph based on full lists, it has an additional bias related to the lack of absence data. For example, we can observe the more frequent reporting of a given species during a spring migratory return even though the numbers are greater at the start of the fall (but less noted). There can also be the scarcity effect which causes a strong observation pressure targeted on a few individuals momentarily. It is therefore important to compare it to the graph of the percentage of lists containing the species to get a more accurate idea of ​​the presence and / or abundance of the species.