Twin-spot fritillary (Brenthis hecate)

References to Cynthia magazine

• Cynthia 8, page 24 Com diferenciar les espècies del gènere Brenthis: B. daphne, B. hecate i B. ino
• Cynthia 16, page 16 Gestió i conservació

Phenology

The flight curve is calculated as a relative abundance throughout the BMS season based on data from stations from the same climatic region. The graph shows the phenology for each climatic region in which the species is regularly recorded. For more information on the calculation method, see the Data Analysis section.

Habitat preferences

The habitat preference of a species is shown in the following graph, which represents as a percentage the average annual density (specimens per 100 m) of the species in each habitat type. For more information, visit the data analysis section.

This species has not been taken into account for the habitat preferences analysis or the SSI and TAO indices, due to the fact that the number of transects in which it appears is too low (below 5). For more information visit the data analysis section.

Altitude distribution

Bars represent the average abundance of the species (annual average number of specimens per 100 m) in altitudinal ranges of 200 m. Lines show abundance ranges (minimum-maximum). You can check the exact values of abundance, as well as the sample size (number of transects) by passing the mouse over the bars.

Population trend

The graph shows the temporal trends in abundance (with 95% confidence intervals) at regional level (i.e. climatic region) and in the CBMS network as a whole (in general). You can click on the box below to change the climatic region. For more details on how the annual index of abundance is calculated, see the Data Analysis section.

Maps of abundances and trends

The map of abundances show the average annual abundance of the species in the CBMS network over the entire data series. By clicking on the dots on this map you can access the station datasheet. The trends map show the trends of the species in each of the transects. By clicking on the dots on this map you can access to the ‘species x transect’ datasheet. Information given in the table can be sorted by abundance, population trend, altitude and number of years of available data. By clicking on the trend box for any of the transects, you can also access the Species by transect datasheet.

• Abundances
• Trends
• Transects (5)