. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. SYMB10NT POPULATIONS IN SEEP AND VENT MUSSELS 149 bl. Figure 3. Transmission electron micrographs of transverse sections through (A) Barhymoiliolua uzoricim and (B) B. heckerae mussel gill tilaments of juveniles (JI size class), bl, basal lamina; er. endoplasmic reticulum: ly, lysosomal-like residual body; mt. mitochondrion; n. nucleus; m. methanotrophic morphotypes; arrowheads, chemoautotrophic morpho- types. Scale bars = 1 ^m. methanotrophic morphotype densities (Fig. 5A). Variation in densities of both morphotypes was max
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. SYMB10NT POPULATIONS IN SEEP AND VENT MUSSELS 149 bl. Figure 3. Transmission electron micrographs of transverse sections through (A) Barhymoiliolua uzoricim and (B) B. heckerae mussel gill tilaments of juveniles (JI size class), bl, basal lamina; er. endoplasmic reticulum: ly, lysosomal-like residual body; mt. mitochondrion; n. nucleus; m. methanotrophic morphotypes; arrowheads, chemoautotrophic morpho- types. Scale bars = 1 ^m. methanotrophic morphotype densities (Fig. 5A). Variation in densities of both morphotypes was maximal in the small- est, post-larval size class. No significant differences in me- dian symbiont densities were detected in Kruskal-Wallis comparisons of size-class pairs within B. azoricus (chemo- autotrophs. P = : methanotrophs. P = ). Methanotrophic symbionts accounted for more than 60% of the total bacterial symbiont density in B. heckerae, com- pared to less than 10% in B. azoricus (Fig. 5). Methanotro- phic and chemoautotrophic densities were uniformly low in B. heckerae (mean density of both morphotypes combined. < 15 cells per jam2) in all size classes examined (Fig. 5B). The median density of symbionts in B. heckerae did not differ among the size-classes examined (chemoau- totrophs. P = ; methanotrophs, P = ). Stable isotopic compositions A difference of more than 25c/« was measured in the 513C compositions (Fig. 6) of B. azoricus (~ — 30%o) and B. heckerae (- 56%c). Within B. azoricus, the 513C compo- sition was enriched in L1C (by 3%<-<) in juvenile mussels (20 mm shell length). Average 815N values of mussel tissues (Fig. 6) were also different in the two species (B. azoricus: - —9%c; B. heckerae: - - 29cc), and there was a small (~) difference in the nitrogen isotopic composition of small and large individuals of B. azoricus. Average 8I?N values were enriched in 15N by ~ in large individuals of B. heck- erae (>20 mm
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
