Ova fecundity in Scottish atlantic salmon Salmo salar: predictions, selective forces and causal mechanisms

P. Bacon, J. MacLean, I. Malcolm, William Gurney

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Abstract

Ova fecundities of Scottish Atlantic salmon Salmo salar, predicted from log(10) regression of ova numbers and female fork length (L(F)), differed widely between upland and lowland stocks within the same river, whereas sea-age, river and year factors had insignificant effects on fecundity once L(F) was accounted for. For upland fish, the relationship between log(10)L(F) and log(10) ova mass (M(O)) was stable between two datasets collected 40 years apart. Although upland and lowland females both produced comparable log(10)M(O) (log(10)L(F))(-1), lowland females partitioned this into 45% more, but smaller ova, whereas upland females produced fewer, but larger, eggs. The possible causes and implications of this are discussed for evolutionary perspectives (lifetime production), population structure (local tributary v. large catchments; environmental effects), population dynamics and stability (density-dependent control mechanisms) and fisheries management (stock-recruitment; short and long-term stock sustainability).
Original languageEnglish
Pages (from-to)921-938
Number of pages18
JournalJournal of Fish Biology
Volume81
Issue number3
Early online date11 Jun 2012
DOIs
Publication statusPublished - Aug 2012

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Keywords

  • mathematical statistics
  • atlantic salmon
  • salmo salar
  • ova fecundity
  • scottish
  • causal mechanisms
  • sustainable fisheries management
  • population dynamics
  • stock–recruitment

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