D1C1: The levels of incidental catches should be anecdotal or not visible and in no case should negatively affect the population dynamics of the species concerned, taking into account the cumulative impact of all forms of fishing, periods and regions. D1C2: If the present population (threshold value) is found above 80 % of its reference value in species that are single-egg, or 70 % in species that make more than one egg, the BEA is reached. D1C3: Demographic characteristics of the population do not endanger its long-term viability, so that the reproductive parameters and adult survival values are indicated. D1C4: No colonies/breeding units of the evaluated species are lost. D1C5: This criterion has not been considered for the birds group because of the difficulty to properly assess the habitat of the different species assessed and to establish reference values.