ABSTRACT Significant deviations from the Hardy-Weinberg equilibrium in natural populations of bivalves may be due to a number of factors such as the Wahlund effect, null alleles and

selection, and it is often difficult to decide which of these factors is operating. The use of laboratory controlled single crosses and mass matings, where the genotypes of the parents are

known, can provide strong evidence for selection when deviations from expected genotype frequencies are observed in the offspring. Several cultures of offspring from a single cross and from

a mass mating of the mussel, _Mytilus edulis_, were reared through the larval stage at either 32 or 25 parts per thousand salinity. At the early post-larval stage salinities were altered for

allele _Lap__94_ was selected against at low salinity during the post-larval to juvenile stage, but no such selection occurred at low salinity during the larval stage. The data fit

Koehn's (1985) model of post-larval selection at the _Lap_ locus in mussels in Long Island Sound, USA, but suggest that there may be ontogenetic variation in fitness at this locus.

Results at the _Pgm_ and _Gpi_ loci indicate that these loci are probably acting as markers for other loci on the same chromosome which have a strong effect on fitness. Density dependent

factors may have caused some of the non-random mortality amongst offspring which was apparently independent of salinity. SIMILAR CONTENT BEING VIEWED BY OTHERS GENETICS AND ONTOGENY ARE KEY

FACTORS INFLUENCING THERMAL RESILIENCE IN A CULTURALLY AND ECONOMICALLY IMPORTANT BIVALVE Article Open access 19 August 2024 SHEDDING LIGHT ON VARIATION IN REPRODUCTIVE SUCCESS THROUGH

STUDIES OF POPULATION GENETIC STRUCTURE IN A SOUTHEAST PACIFIC COAST MUSSEL Article 06 April 2023 HYDROPOWER-INDUCED SELECTION OF BEHAVIOURAL TRAITS IN ATLANTIC SALMON (_SALMO SALAR_)

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molluscs. _Malacologia_, 25, 583–591. Google Scholar  Download references AUTHOR INFORMATION AUTHORS AND AFFILIATIONS * School of Ocean Sciences, UCNW, Marine Science Laboratories, Menai

Bridge, Gwynedd, LL59 5EY A R Beaumont, C M Beveridge, E A Barnet, M D Budd & M Smyth-Chamosa Authors * A R Beaumont View author publications You can also search for this author inPubMed

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laboratory reared _Mytilus edulis._ I. Genotype specific selection in relation to salinity. _Heredity_ 61, 389–400 (1988). https://doi.org/10.1038/hdy.1988.129 Download citation * Received:

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