. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 412 J. P. A. GARDNER ET AL Discussion In England, M. galloprovincialis is presumed to be at the northernmost limit of its distribution (Seed, 1971; Gosling, 1984). For sites in England, it may therefore be predicted that the endemic cold-water M. edulis form should have a growth advantage over the warm-water M. galloprovincialis form. At <20°C in the laboratory. Seed (1971) found that M. edulis grew up to four times faster than M. galloprovincialis from Rock, England. However, he was doubtful if these difference
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 412 J. P. A. GARDNER ET AL Discussion In England, M. galloprovincialis is presumed to be at the northernmost limit of its distribution (Seed, 1971; Gosling, 1984). For sites in England, it may therefore be predicted that the endemic cold-water M. edulis form should have a growth advantage over the warm-water M. galloprovincialis form. At <20°C in the laboratory. Seed (1971) found that M. edulis grew up to four times faster than M. galloprovincialis from Rock, England. However, he was doubtful if these differences would be maintained under natural conditions. Using a larger data set taken from mussels that, since their settlement, had been growing at high and low shore locations in two hybrid populations in England, we have shown that gal- loprovincialis has a small but significant growth advantage over edulis. The negative correlation between E allele frequency and age lends support to the third hypothesis, advanced by Skibinski (1983), that differential mortality acts against the more numerous and smaller edulis. The most pro- nounced changes in length-dependent allele frequencies occur at older ages (8-9 years at CHS and WHS. 6-8 Table V Ptirniiicicr\ l the i»>/\ •noniuil ;,'» for genotype-dependent hest- jn growth cum1* Location Genotype Intercept Linear term Square term (X10) Cubic term ( • 10) R2 CHS E/E E/E E/G E/G G/G G/G CLS E/E E/E U2 E/G E/G G/G G/G WHS E/E E/E E/G E/G 0. 1 52 G/G G/G - 1 .062 - 1 .165 WLS E/E E/E E/G E/G G/G G/G CHS, CLS = Croyde high shore, Croyde low shore; WHS, WLS = Wh
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
