Info

Table 12.2 Pre-migratory fattening in White-crowned Sparrows Zonotrichia leucophrys wintering at different latitudes in relation to aspects of photoperiod. Although birds fattened at widely different dates at different latitudes, and had experienced different total amounts of daylight since the winter solstice, the mean daylength between the solstice and start of fattening was about the same in birds from all latitudes

Table 12.2 Pre-migratory fattening in White-crowned Sparrows Zonotrichia leucophrys wintering at different latitudes in relation to aspects of photoperiod. Although birds fattened at widely different dates at different latitudes, and had experienced different total amounts of daylight since the winter solstice, the mean daylength between the solstice and start of fattening was about the same in birds from all latitudes

Mean wintering latitude (°N)

Days of start of pre-migratory fatteninga

Cumulative daylight hours from winter solsticea

Mean daylength (hours) from winter solstice to start of migratory fatteninga

0 0

Post a comment