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## Context
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After each growth process, survival of each individual was assessed depending on its location and stage.
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## Modeling
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For a riverine individual j, survival probability over ndays was calculated as the daily survival probability (Spj) elevated to the power ndays (i.e. Spjndays). Spj could take the value of one of the popula- tion parameter Sp0+ , Sp1 , Sp1Mat , Sp1Smolt , SpMat , SpN , SpAnad (Table 2) depending if the individual j was respectively: a parr of less than 6 months, a parr between 6 months and 1 year, a maturing parr between 6 months and 1 year, a parr future smolt at 1 year, a matur- ing parr of more than a year, a parr in another situation and an anadromous salmon back in the river.
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Post-smolt survival is known as strongly related to size in marine environment (Salminen, 1997), thus sea survival was size- dependant. For each day t a daily survival probability (Spj,t) was computed as (Mangel, 1994):
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where ̨S and ˇS (Table 2 and see Appendix B) were population parameters. The survival over a number of days was then the prod- uct of these daily survivals.
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Survival is also affected by [fishery mortality](fishing) |
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