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Fig. 3. Sphaerechinus granularis (echinoderm). (A) Dose-dependent effects
of decanal (circles) and 2E,4E-decadienal (triangles) on
cell division during the early embryogenic phase (four blastomeres) in 2.5
h-old embryos. Values are means of three replicate measurements. Standard
error (<3% of the mean) is not shown. (B) Light microscope photographs of
(1) normal divided embryos observed either in seawater controls or in
2E,4E-decadienal (<5 µmol l-1) and decanal
(<80 µmol l-1) test solutions, (2) abnormal embryos
presenting totally blocked or abnormal cell divisions in
2E,4E-decadienal (>10 µmol l-1) and (3)
blocked embryos presenting intoxication features with decanal (>80 µmol
l-1). Egg size: 95 ±6 µm. Scale bar applies to 1, 2 and
3.
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