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| Alunno-bruscia, Marianne; Bourget, Edwin; Frechette, Marcel. |
| We examined the influence of food availability and population density on the morphometry and shell length body mass relationship of Mytilus edulis. Mussels were reared in the laboratory for 22 mo at 8 different density levels in 11 chambers supplied with natural seston at 2 different concentrations. This allowed us to assess separately the effects of food availability and mussel density. The shell length/width and shell height/width ratios were affected by food, density and time. Mussels tended to be narrower (flatter) at high density and at low food level. Therefore, narrow shells could result from reduced food concentration in high density situations without implying physical interference. Shell mass was also influenced by both food and density levels,... |
| Tipo: Text |
Palavras-chave: M N curve; Length mass density relationship; Food regulation; Shell allometry; Mussels. |
| Ano: 2001 |
URL: http://archimer.ifremer.fr/doc/2001/publication-807.pdf |
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| Brind'Amour, Anik; Bourget, Edwin; Tremblay, Rejean. |
| On the western coast of the Atlantic, according to the literature, 2 distinct groups of Semibalanus balanoides occur with a distinct interface near the Miramichi Estuary, New Brunswick, in the Gulf of St. Lawrence. On each side of this interface, the groups are characterized by clinal variations for MPI (mannose-6-phosphate isomerase) and GPI (glucose-6-phosphate isomerase). The present study was carried out to determine whether selection occurs at this interface, to establish how early in the sessile life period it occurs and to examine the selecting forces involved. Reciprocal transplant experiments of newly settled individuals to both sides of the interface were carried out. No significant differences specifically linked to source or destination were... |
| Tipo: Text |
Palavras-chave: Semibalanus; Genetics; Selection; Fecundity; Growth rate; Survival. |
| Ano: 2002 |
URL: http://archimer.ifremer.fr/doc/00048/15970/13410.pdf |
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