Hydrology influences survival during early life stages.
unsuitable for incubation
Notes:
The majority of mortality occurs during the first year of life. We hypothesize two main linkages between early survival and hydrologic conditions. On the left, temperature mortality of eggs is higher in dry years when temperature rise too soon after the spawning season begins in spring. This is compensated for to some extent by a faster rate of development.
On the right, larvae go through a demersal period before they settle to the bottom. In very short reaches with run-of-river operations, high turnover rates may wash larvae downstream before they have a chance to settle out. This may account for poor recruitment in some Snake River reaches.